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Microstructure, mechanical properties and wear behaviour of Zn-Al-Cu-TiB_2 in situ composites 被引量:5
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作者 陈飞 王同敏 +3 位作者 陈宗宁 毛丰 韩强 曹志强 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第1期103-111,共9页
Zn-Al-Cu-TiB2(ZA27-TiB2) in situ composites were fabricated via reactions between molten aluminum and mixed halide salts(K2TiF6 and KBF4) at temperature of 875 °C. The microstructure, mechanical properties an... Zn-Al-Cu-TiB2(ZA27-TiB2) in situ composites were fabricated via reactions between molten aluminum and mixed halide salts(K2TiF6 and KBF4) at temperature of 875 °C. The microstructure, mechanical properties and wear behavior of the composites were investigated. Microstructure analysis shows that fine and clean TiB2 particles distribute uniformly through the matrix. The mechanical properties of the composites increase with the increase in TiB2 content. As TiB2 content increases to 5%(mass fraction), an improvement of HB 18 in hardness and 49 MPa in ultimate tensile strength(UTS) is achieved. The overall results reveal that the composites possess low friction coefficients and the wear rate is reduced from 5.9×10-3 to 1.3×10-3 mm3/m after incorporating 5% TiB2. Friction coefficient and worn surface analysis indicate that there is a change in the wear mechanism in the initial stage of wear test after introducing in situ TiB2 particles into the matrix. 展开更多
关键词 in situ composites TiB2 particles friction coefficient wear rate mechanical properties
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STUDY ON THE MICROSTRUCTURE OF LaB_6-ZrB_2 IN-SITU COMPOSITE
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作者 陈昌明 张立同 +1 位作者 周万城 成来飞 《Chinese Journal of Aeronautics》 SCIE EI CSCD 1998年第1期71-75,共5页
STUDYONTHEMICROSTRUCTUREOFLaB6┐ZrB2IN┐SITUCOMPOSITEChenChangming(陈昌明),ZhangLitong(张立同),ZhouWancheng(周万城),Che... STUDYONTHEMICROSTRUCTUREOFLaB6┐ZrB2IN┐SITUCOMPOSITEChenChangming(陈昌明),ZhangLitong(张立同),ZhouWancheng(周万城),ChengLaifei(成来飞)(Sta... 展开更多
关键词 lanthanum hexaboride zirconium diboride in situ composite eutectic microstructure CRYSTALLOGRAPHY
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Microstructure and mechanical properties of in situ TiB_2/7055 composites synthesized by direct magnetochemistry melt reaction 被引量:1
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作者 钟龙华 赵玉涛 +3 位作者 张松利 陈刚 陈帅 刘永红 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第9期2502-2508,共7页
In situ TiB2/7055 composites were successfully synthesized via magnetic chemical direct melt reaction from 7055 (Al-3B)?Ti system. The phase composition and the microstructure of the composites were investigated by... In situ TiB2/7055 composites were successfully synthesized via magnetic chemical direct melt reaction from 7055 (Al-3B)?Ti system. The phase composition and the microstructure of the composites were investigated by XRD, OM and SEM technologies, and the mechanical and wear properties were tested. The results indicate that with the pulsed magnetic field assistance, the morphologies of in situ TiB2 particles are mainly hexagonal-shape or nearly spherical, the sizes are less than 1 μm, and the distribution of the matrix is uniform. Compared the microstructures of the 7055 aluminum matrix composites synthesized without pulsed magnetic field, the average size ofα(Al) phase with pulsed magnetic field assistance is decreased from 20 to 10μm, the array of the second phase is changed from continuous net-shape to discontinuous shape. With the pulsed magnetic field, the tensile strengths of the composites are enhanced from 310 to 330 MPa, and the elongations are increased from 7.5%to 8.0%. In addition, compared with matrix alloy, the wear mass loss of the composites is decreased from 111 to 78 mg under a load of 100 N for 120 min. 展开更多
关键词 in situ composite magnetic chemistry microstructure mechanical properties
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Enabling High-Performance Sodium Battery Anodes by Complete Reduction of Graphene Oxide and Cooperative In-Situ Crystallization of Ultrafine SnO_(2)Nanocrystals 被引量:2
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作者 Junwu Sang Kangli Liu +4 位作者 Xiangdan Zhang Shijie Zhang Guoqin Cao Yonglong Shen Guosheng Shao 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2023年第3期356-365,共10页
The main bottleneck against industrial utilization of sodium ion batteries(SIBs)is the lack of high-capacity electrodes to rival those of the benchmark lithium ion batteries(LIBs).Here in this work,we have developed a... The main bottleneck against industrial utilization of sodium ion batteries(SIBs)is the lack of high-capacity electrodes to rival those of the benchmark lithium ion batteries(LIBs).Here in this work,we have developed an economical method for in situ fabrication of nanocomposites made of crystalline few-layer graphene sheets loaded with ultrafine SnO_(2)nanocrystals,using short exposure of microwave to xerogel of graphene oxide(GO)and tin tetrachloride containing minute catalyzing dispersoids of chemically reduced GO(RGO).The resultant nanocomposites(SnO_(2)@MWG)enabled significantly quickened redox processes as SIB anode,which led to remarkable full anode-specific capacity reaching 538 mAh g^(−1)at 0.05 A g^(−1)(about 1.45 times of the theoretical capacity of graphite for the LIB),in addition to outstanding rate performance over prolonged charge–discharge cycling.Anodes based on the optimized SnO_(2)@MWG delivered stable performance over 2000 cycles even at a high current density of 5 A g^(−1),and capacity retention of over 70.4%was maintained at a high areal loading of 3.4 mg cm^(−2),highly desirable for high energy density SIBs to rival the current benchmark LIBs. 展开更多
关键词 in situ compositing microwave reduced graphene oxide sodium ion battery sodium ion battery anode ultrafine SnO_(2)nanocrystals
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Wear performance of in-situ aluminum matrix composite after micro-arc oxidation 被引量:15
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作者 Yaman ERARSLAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第2期347-352,共6页
An attempt was made to modify the surface of in-situ aluminium matrix composite (AMC) by micro-arc oxidation (MAO). In the microstructure of AMC, CuAl2 reinforcements were generated by introducing 15% CuO into the... An attempt was made to modify the surface of in-situ aluminium matrix composite (AMC) by micro-arc oxidation (MAO). In the microstructure of AMC, CuAl2 reinforcements were generated by introducing 15% CuO into the aluminium melt. AMC was hot forged, homogenised, quenched and artificially aged before the MAO in a KOH, KF and Na2SiO3-containing electrolyte. After the MAO process the surface of the AMC was covered with Al2O3 coating having an effective thickness of about 15μm. Appearance of crack and/or delamination free zones at the periphery of the indent after the Rockwell C adhesion test indicated good adhesion between the composite and the Al2O3 coating. During dry sliding wear tests, this adherent Al2O3coating resisted the destructive action of the Al2O3 ball and provided about 15 times enhancement in wear resistance as compared to the original state. 展开更多
关键词 in situ composite aluminum matrix composite microarc oxidation WEAR TRIBOLOGY
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RECIPROCATING EXTRUSION OF IN SITU Mg_2Si REINFORCED Mg-Al BASED COMPOSITE 被引量:8
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作者 Z.M. Zhang C.J. Xu X.F. Guo S.Z. Jia 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2008年第3期169-177,共9页
M92Si reinforced Mg-Al based composite with high amount o/silicon was prepared by permanent mould casting, and then extruded by reciprocating extrusion (RE) after the composite was processed by homogenization heat t... M92Si reinforced Mg-Al based composite with high amount o/silicon was prepared by permanent mould casting, and then extruded by reciprocating extrusion (RE) after the composite was processed by homogenization heat treatment. The effect of RE processing on the morphology and size of M92Si and the mechanical properties of the com- posite were investigated, to develop new ways to refine the M928i phase and improve its shape. The result showed that RE was very useful in refining the M92Si phase. The more the RE processing passes, the better the refining effect would be. Moreover, the uniform distribution of M928i phases would be more in the composite. After the composite was processed by RE for 12 passes, most M92Si phases were equiaxed, with granular diameter below 20 μm, and distributed uniformly in the matrix of the composite. The mechanical properties of the composite could be increased prominently by RE processing, and were much higher than that in the as-cast state. As the temperature rises, the tensile strength is reduced. For the composite RE processed for 12 passes, the tensile strength, yield strength, and elongation are 325.9 MPa, 211.4 MPa, and 3.3% at room temperature, whereas, 288.2 MPa, ,207.7 MPa, and 7.8%, respectively, at 150℃. In comparison with the properties at room temperature, the tensile strength and yield strength are high and only decrease by 11.6% and 1.8% at 150℃. The M928i reinforced Mg-Al based composite possesses good heat resistance at 150℃. The excellent resistance to effect of heat is attributed to the high melting tempera- ture and good thermal stability of fine Mg2Si phases, which are distributed uniformly in the composite, and effectively hinder the grain boundary gliding and dislocation movement. 展开更多
关键词 Reciprocating extrusion Magnesium alloy in situ composite Elevated temperature property
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Preparation of Al-Al_3Ti in situ composites by direct reaction method 被引量:7
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作者 YU Huashun CHEN Hongmei SUN Liming MIN Guanghui 《Rare Metals》 SCIE EI CAS CSCD 2006年第1期32-36,共5页
Al-Al3Ti composites were prepared by a direct reaction method, in which Al3Ti was formed by the reaction of Ti and Al in aluminum alloy melt. The morphology of Al3Ti changes apparently from the fine particle, needle-l... Al-Al3Ti composites were prepared by a direct reaction method, in which Al3Ti was formed by the reaction of Ti and Al in aluminum alloy melt. The morphology of Al3Ti changes apparently from the fine particle, needle-like to large block with the increase of Al3Ti content. The addition of magnesium can markedly change the morphology of Al3Ti and reduce their size. Short rod-like Al3Ti was formed and homogeneous distribution was obtained with the addition of 3 wt.% Mg. The effect of Al3Ti and Mg on the microstructure of Al-Al3Ti composites and the mechanism were also discussed. 展开更多
关键词 AL3TI in situ composites direct reaction method MICROSTRUCTURE
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Microstructure and Mechanical Behavior of in Situ Primary Si/Mg_2Si Locally Reinforced Aluminum Matrix Composites Piston by Centrifugal Casting 被引量:3
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作者 HAO Xuhong LIU Changming PAN Dengliang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2011年第4期656-660,共5页
Al-Si pistons are frequently damaged by burning piston top surface due to elevated combustion temperature, and by rubbing the first ring groove against the engine cylinder liner. To prevent piston from these damages, ... Al-Si pistons are frequently damaged by burning piston top surface due to elevated combustion temperature, and by rubbing the first ring groove against the engine cylinder liner. To prevent piston from these damages, some technologies were invented, such as mounting high Ni cast iron ring around the first ring groove in Al alloy piston body and thermal resistant steel on piston top surface, and fabricating Al composite pistons by squeeze casting for enhancing the whole or local piston performance. In this paper, composite pistons locally reinforced with in situ primary Si and primary Mg2Si particles are fabricated by centrifugal casting. The microstructure characteristics, hardness and wear resistance of the composite piston are investigated and the motion characteristic of the in situ particles in centrifugal field is analyzed. The results of the experiments show that primary Si and Mg2Si particles mix up with each other in melt and segregate at the regions of piston top and piston ring grooves under the effect of centrifugal force. Particulate reinforced regions have a higher hardness and better wear resistance compared with the unreinforced regions and this performance increases after heat treatment. The analysis result of particle movement shows that, primary Si and primary Mg2Si particles move at approximately the same velocity in the centrifugal field, because of the growth of primary Si and fusion after colliding between primary Si particles, which compromised the velocity difference of primary Si and primary Mg2Si particles caused by the difference of their densities. Research results have some theory significance and applicative value of project in development of new aluminum matrix composites piston products. 展开更多
关键词 PISTON centrifugal casting in situ composite primary Si MG2SI
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Microstructure of in situ Al_3Ti/6351Al composites fabricated with electromagnetic stirring and fluxes 被引量:5
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作者 李桂荣 王宏明 +3 位作者 赵玉涛 陈登斌 陈刚 程晓农 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第4期577-583,共7页
The 6351 wrought aluminum alloy and K2TiF6-CaF2-LiCl components were selected as raw materials to fabricate in situ Al3Ti particulate reinforced aluminum alloy at 720℃via direct melt reaction method with electromagne... The 6351 wrought aluminum alloy and K2TiF6-CaF2-LiCl components were selected as raw materials to fabricate in situ Al3Ti particulate reinforced aluminum alloy at 720℃via direct melt reaction method with electromagnetic stirring(EMS).CaF2 and LiCl acted as fluxes to lower the reaction temperature of the system.It is shown that the electromagnetic stirring and fluxes accelerate the emulsion process of K2TiF6.Optical microscopy,scanning electron microscopy,transmission electron microscopy and energy dispersive spectrum were utilized to analyze the microstructure and components of composites.Compared to composites fabricated without EMS and fluxes,the sizes of endogenetic Al3Ti are refined from 10-15μm to 2-4μm,which are often accompanied with silicon element.The morphology of Al3Ti or Al3TiSi0.22 exhibits triangle,quadrilateral and other clumpy patterns. Because of the Ca elements from CaF2,the sizes of Mg2Si decrease from 8-10μm to 1-2μm due to the formation of Ca2Si. 展开更多
关键词 6351 AI alloy MICROSTRUCTURE in situ particle reinforced aluminum composites electromagnetic stirring FLUXES
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AN IN SITU SURFACE COMPOSITE AND GRADIENT MATERIAL OF Al-Si ALLOY PRODUCED BY ELECTROMAGNETIC FORCE 被引量:3
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作者 Z.M. Xu, T.X. Li, Z.L. Zhu and Y.H. Zhou School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2001年第5期335-340,共6页
Because of the different conductivities between the primary phase (low electric conduc tivity) and the metal melt, electromagnetic force scarcely acts on the primary phase. Thus, an electromagnetic repulsive force ap... Because of the different conductivities between the primary phase (low electric conduc tivity) and the metal melt, electromagnetic force scarcely acts on the primary phase. Thus, an electromagnetic repulsive force applied by the metal melt exerts on the pri mary phase when the movement of the melt in the direction of electromagnetic force is limited. As a result, the repulsive force exerts on the primary phase to push them to move in the direction opposite to that of the electromagnetic force when the metal melt with primary phase solidifies under an electromagnetic force field. Based on this, a new method for production of in situ surface composite and gradient material by electromagnetic force is proposed. An in situ primary Si reinforced surface composite of Al-15wt%Si alloy and gradient material of Al-l9wt%Si alloy were produced by this method. The microhardness of the primary Si is HV1320. The reinforced phase size is in the range from 40μm to 100μm. The wear resistance of Al-Si alloy gradient material can be more greatly increased than that of their matrix material. 展开更多
关键词 Al-Si alloy electromagnetic force in situ surface composite gradient material
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In situ(Mg_2Si+MgO)/Mg composites fabricated from AZ91-Al_2(SiO_3)_3 with assistance of high-energy ultrasonic field 被引量:2
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作者 张松利 赵玉涛 陈刚 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第11期2096-2099,共4页
In situ (Mg2Si+MgO)/Mg composites fabricated from AZ91-A12(SiO3)3 under high-energy ultrasonic field were investigated by XRD, DSC and SEM. The results indicate that the size, morphology and distribution of the i... In situ (Mg2Si+MgO)/Mg composites fabricated from AZ91-A12(SiO3)3 under high-energy ultrasonic field were investigated by XRD, DSC and SEM. The results indicate that the size, morphology and distribution of the in situ Mg2Si particles are greatly optimized with the assistance of the high-energy ultrasonic field. The amounts of the in situ Mg2Si particles are increased, the sizes are refined, the distributions become uniform, and the morphologies are changed to smooth olive-shape or spherical shape. The amounts of brittle fl-Mgl7All2 phases are decreased and the morphologies are granulated. The values of the tensile strength ab and HB hardness are increased. These are due to the cavitation effects and acoustic streaming effects induced by the high-energy ultrasonic field. 展开更多
关键词 in situ composites high-energy ultrasonic field morphology microstructure mechanical property
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Biomimetic Preparation of Magnetite/Chitosan Nanocomposite via In Situ Composite Method ——Potential Use in Magnetic Tissue Repair Domain 被引量:2
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作者 HU Qiao-ling WU Jia CHEN Fu-ping SHEN Jia-cong 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2006年第6期792-796,共5页
This study focused on the preparation of magnetic chitusan nanocompesite that has a potential application to bone repair and regeneration using an in situ composite method where chitosan membrane was used as the templ... This study focused on the preparation of magnetic chitusan nanocompesite that has a potential application to bone repair and regeneration using an in situ composite method where chitosan membrane was used as the template and NaOH was used as the precipitant. X-ray diffraction analysis results show the formation of magnetite in the chitosan matrix. From the magnetic measurement, it could be concluded that the magnetic chitosan rods were superparamagnetic,and that this is the unique property of nanomagnetite. Macroscopical layer structure of the magnetic chitosan rods was observed from the photographs after mechanical test, and the microlayer structure of the rods was observed from the images of scanning electron microscopy. The mechanism for preparing the rods was discussed in detail. Transmission electron microscope was used to investigate the magnetite particles in the chitosan matrix and from the images it was concluded that the magnetite particles dispersed well in chitosan matrix with particle size of about 10 nm. The mechanical properties of the magnetic chitosan rods were measured and the blending strength was found to be 98. 8 MPa. The mechanical properties did not decline when compared with those of the pure chitosan materials. 展开更多
关键词 CHITOSAN MAGNETITE in situ compositing Red
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Research on development of in situ titanium matrix composites and in situ reaction thermodynamics of the reaction systems 被引量:3
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作者 Lifang Cai Yongzhong Zhang Likai Shi Haoqiang Yang Mingzhe Xi 《Journal of University of Science and Technology Beijing》 CSCD 2006年第6期551-557,共7页
The in situ synthesis method for titanium matrix composites (TMCs) has obvious technical and economical advantages over other traditional methods. Ultrafine reinforcement particles were formed in situ by chemical re... The in situ synthesis method for titanium matrix composites (TMCs) has obvious technical and economical advantages over other traditional methods. Ultrafine reinforcement particles were formed in situ by chemical reaction between elements or between elements and compounds. Using the approach, contamination at the composite matrix/reinforcement particle interface did not occur, interface bonding was good, and the reinforcement particle was thermodynamically stable. The stage of development of the preparation process for in situ TMCs as well as the thermodynamic analysis of the possible in situ reaction systems was described. 展开更多
关键词 in situ titanium matrix composites reaction synthesis reaction system thermodynamic analysis
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Casting fabrication of in situ Al_3Ti-Al composites and their wear behaviors 被引量:3
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作者 Chen Tijun Li Jian Hao Yuan 《China Foundry》 SCIE CAS 2009年第4期319-327,共9页
The Al3Ti intermetallic reinforced pure Al,Al-13Si and Al-17Cu matrix composites were prepared by casting method.Their microstructures and dry sliding wear behaviors at room temperature and 100℃were particularly inve... The Al3Ti intermetallic reinforced pure Al,Al-13Si and Al-17Cu matrix composites were prepared by casting method.Their microstructures and dry sliding wear behaviors at room temperature and 100℃were particularly investigated.The results indicated that the Al3Ti phases in these composites were all in flaky form.But the aspect ratio of the Al3Ti platelets decreased with the increase of Ti content in the pure Al,Al-Cu and Al-Si matrix composites,in order of effectiveness.The effect of Si on the Al3Ti morphology seemed to be greater than that of Cu.The distributions of the Al3Ti platelets were different in the different matrix composites,leading to different grain refining effects.Except for the sub-wear regime of adhesive wear,the plastic deformation induced wear was a dominant wear mechanism for all of the composites at room temperature and 100℃.Increasing the testing temperature,decreasing the Al3Ti content or the hardness of materials could enhance these two wear mechanisms,and thus increase the wear rate.The Al-Cu matrix composite had the best wear resistance,while the pure Al matrix composite showed the worst for the same Ti content.These differences or changes were attributed to the differences in materials'hardness or the strengthening effects of the Al3Ti platelets. 展开更多
关键词 in situ Al3Ti-Al composite CASTinG MICROSTRUCTURE wear resistance wear mechanism
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Erosive Wear and Wear Mechanism of in situ TiC_P/Fe Composites 被引量:3
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作者 Zhaojing LIU, Zhiliang NING , Fengzhen LI, Xiurong YAO and Shanzhi RENSchool of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150080, China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2005年第5期719-723,共5页
The base structure of in situ TiCp/Fe composites fabricated under industrial condition was changed by different heat treatments. Erosive wear tests were carried out and the results were compared with that of wear-resi... The base structure of in situ TiCp/Fe composites fabricated under industrial condition was changed by different heat treatments. Erosive wear tests were carried out and the results were compared with that of wear-resistant white cast iron. The results suggest that the wear resistance of the in situ TiCp/Fe composite is higher than that of wear-resistant white cast iron under the sand erosive wear condition. The wear mechanism of the wear-resistant white cast iron was a cycle process that base surface was worn and carbides were exposed, then carbides was broken and wear pits appeared. While the wear mechanism of in situ TiCp/Fe composite was a cycle process that base surface was worn and TiC grains were exposed and dropped. The wear resistance of in situ TiCp/Fe composite was lower than that of wear-resistant white cast iron under the slurry erosive wear condition. Under such circumstance, the material was not only undergone erosive wear but also electrochemistry erosion due to the contact with water in the medium. The wear behaviours can be a combination of two kinds of wear and the sand erosive wear is worse than slurry erosive wear. 展开更多
关键词 in situ TiCp/Fe composite Erosive wear Wear mechanism
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In situ TiB2/Cu composites fabricated by spray deposition using solid-liquid and liquid-liquid reactions 被引量:3
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作者 Dan CHEN Yi-hui JIANG +4 位作者 Yu-fa LI Di LIU Jiang-tan HE Fei CAO Shu-hua LIANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第7期1849-1856,共8页
In situ TiB2/Cu composites were fabricated by both solid-liquid(S-L)and liquid-liquid(L-L)reactive spray deposition in combination with cold rolling and annealing.The microstructure and properties of the fabricated Ti... In situ TiB2/Cu composites were fabricated by both solid-liquid(S-L)and liquid-liquid(L-L)reactive spray deposition in combination with cold rolling and annealing.The microstructure and properties of the fabricated TiB2/Cu composites were investigated.The results show that the reactive mode and rolling treatment are the main factors affecting the microstructure and properties of the TiB2/Cu composite.The in situ reaction in the L-L reaction can be carried out more completely.By controlling the rolling and annealing process,the relative density and the properties of the as-deposited composites are optimized.The comprehensive performance of the deformed TiB2/Cu composite prepared by L-L reactive spray deposition(401 MPa and 83.5%IACS)is better than that by S-L reactive spray deposition(520 MPa and 20.2%IACS). 展开更多
关键词 in situ TiB2/Cu composite reactive spray deposition electrical conductivity tensile strength
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Effect of carbon content on microstructure of in-situ Al_2O_(3p)-TiC_p/Al composites 被引量:2
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作者 寇生中 许广济 丁雨田 《中国有色金属学会会刊:英文版》 CSCD 2001年第5期756-759,共4页
The in situ Al 2O 3p TiC p/Al composite was fabricated by XD (exothermic dispersion) process in TiO 2 Al C system, and the effect of carbon content on the microstructure of the fabricated composite and the reactive te... The in situ Al 2O 3p TiC p/Al composite was fabricated by XD (exothermic dispersion) process in TiO 2 Al C system, and the effect of carbon content on the microstructure of the fabricated composite and the reactive temperature characteristics had been studied. The results show that carbon content affects the microstructure and reactive temperature of Al 2O 3p TiC p/Al composite greatly. The quantity of TiC phases in the fabricated composites increases, while the Al 3Ti phases reduces with increasing carbon content. And when C/TiO 2 molecular ratio is equal to one, the Al 3Ti phase nearly disappears. High temperature metallurgical field caused by strong exothermic reaction influences the synthetic reaction greatly, and higher synthetic temperature was favorable to the synthesis of Al 2O 3p TiC p reinforce particles. 展开更多
关键词 XD technique carbon content in situ Al matrix composites
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Rheology in Processing of in Situ Composites of Polypropylene and Low Melting Poing Metals
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作者 王钧 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2002年第2期93-96,共4页
The low melting point metallic tin powder or alloy of tin and lead was blended with polypropylene. A kind of in situ composite has been prepared. The variations of torque were studied when the composites were mixed in... The low melting point metallic tin powder or alloy of tin and lead was blended with polypropylene. A kind of in situ composite has been prepared. The variations of torque were studied when the composites were mixed in Haake torque rheogeniometer. By way of capillary extrusion, effects upon rheology of the in situ composites of the low melting point metals (LMPM) and coupling agent for their different variety and content, were investigated. From flow curves, the results indicate that in situ composites mixed with the LMPM are a kind of pseudoplastic fluid. If the LMPM were melted, the higher the content of the LMPM, the lower apparent viscosity of composites. Meanwhile, when the coupling agent is added into composites , the viscosity of composite will go up first and drop then. This shows that the LMPM have a promoter flow action on the polypropylene. 展开更多
关键词 low melting point metals POLYPROPYLENE in situ composites rheology in processing
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STUDY ON THE THERMODYNAMICS OF CuO/Al IN SITU Al_2O_3 REINFORCED Al MATRIX COMPOSITES
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作者 Y.Ma Y.Hao S.Z.Kou X.N.Lu 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2004年第5期732-740,共9页
Based on the experiment and the thermodynamics analysis for CuO/Al system, it is founded that the compounding reaction of CuO/Al under low temperature is available. The general equation of adiabatic temperature of the... Based on the experiment and the thermodynamics analysis for CuO/Al system, it is founded that the compounding reaction of CuO/Al under low temperature is available. The general equation of adiabatic temperature of the system is set up, and the influence of resultant concentration and temperature on adiabatic temperature is theoretically analyzed. The values of heat effect of CuO/Al system under different temperature are also caculated. 展开更多
关键词 composites in situ THERMODYNAMICS CUO AL exothermic dispersion
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Model of In Situ Composite of Cobalt(Ⅱ)-Phthalocyanine and Carbonyl Iron for Organic/Inorganic Nanocomposites
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作者 龚荣洲 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2001年第1期1-4,共4页
Cobalt-phthalocyanine/iron nanocomposite particles have been obtained using method of composite in situ, with the mixture of carbonyl iron and solution of cobalt ( Ⅱ ) - phthalocyanine (Co-Pc) ultrasonic dispersing i... Cobalt-phthalocyanine/iron nanocomposite particles have been obtained using method of composite in situ, with the mixture of carbonyl iron and solution of cobalt ( Ⅱ ) - phthalocyanine (Co-Pc) ultrasonic dispersing in N,N-dimethyl-formamide (DMF). Structure characterization of their inner and surface have relation with method of carbonyl iron joined in the mixture, contents of carbonyl iron and Co-Pc in the mixture of Co-Pc ultrasonic dispersing in DMF. With a method of composite in situ controlling reasonable experiment condition, it can be obtained that cobalt-phthalocyanine/iron nanocomposite particles has completely been covered with Co-Pc, they had structure of Chinese gooseberry in inner and mere made up of almost regular spherical shape and the average diameter is 1. 4 μm. 展开更多
关键词 composite in situ NANOcompositeS model structure characterization carbonyl iron cobalt ( ) -phthalocyanine
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