期刊文献+
共找到14篇文章
< 1 >
每页显示 20 50 100
Preparation of Al_2O_3-SiO_2-TiO_2-ZrO_2 Composite Ceramic Membranes by Sol-Gel Method
1
作者 吴建锋 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2005年第1期42-45,共4页
Al 2O 3-SiO 2-TiO 2-ZrO 2 supported membranes were prepar ed by Sol-Gel method. These composite ceramic membranes are level, even and no macro crack. There exist several crystalline phases such as Al 2O 3, TiO... Al 2O 3-SiO 2-TiO 2-ZrO 2 supported membranes were prepar ed by Sol-Gel method. These composite ceramic membranes are level, even and no macro crack. There exist several crystalline phases such as Al 2O 3, TiO 2(a natase), Al 2SiO 5, and ZrO 2 in these membranes. Changing the molar ratio of Al∶Si∶Ti∶Zr,the kinds and content of crystal phases of composite membranes could be different, which may lead to a variety of microstructure of membranes. The surface nanoscale topography and microstructure of membranes were investiga ted by XRD,SEM,AFM,EPMA. The effects of additives and heat treatments on the sur face nanoscale topography and microstructure of composite ceramic membranes were also analyzed. 展开更多
关键词 sol-gel method Al 2o 3-Sio 2-Tio 2-Zro 2 composite ceramic membranes surface nanoscale topography microstructure
下载PDF
Synthesis of Y_2O_3 particle enhanced Ni/TiC composite on TC4 Ti alloy by laser cladding 被引量:18
2
作者 张可敏 邹建新 +2 位作者 李军 于治水 王慧萍 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第8期1817-1823,共7页
A Y2O3 particle enhanced Ni/TiC composite coating was fabricated in-situ on a TC4 Ti alloy by laser surface cladding. The phase component, microstructure, composition distribution and properties of the composite layer... A Y2O3 particle enhanced Ni/TiC composite coating was fabricated in-situ on a TC4 Ti alloy by laser surface cladding. The phase component, microstructure, composition distribution and properties of the composite layer were investigated. The composite layer has graded microstructures and compositions, due to the fast melting followed by rapid solidification and cooling during laser cladding. The TiC powders are completely dissolved into the melted layer during melting and segregated as fine dendrites when solidified. The size of TiC dendrites decreases with increasing depth. Y2O3 fine particles distribute in the whole clad layer. The Y2O3 particle enhanced Ni/TiC composite layer has a quite uniform hardness along depth with a maximum value of HV1380, which is 4 times higher than the initial hardness. The wear resistance of the Ti alloy is significantly improved after laser cladding due to the high hardness of the composite coating. 展开更多
关键词 TC4 Ti alloy Ni/TiC composite y2o3 laser cladding HARDNESS surface modification
下载PDF
Tribological behavior and mechanism of NiCrBSi-Y_2O_3 composite coatings 被引量:1
3
作者 蔡滨 谭业发 +2 位作者 谭华 敬奇锋 张中威 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第7期2002-2010,共9页
The NiCrBSi-Y2O3 composite coatings were prepared on the surface of 45 carbon steel by plasma spray, the microstructure and tribological properties of the coatings were investigated. The results show that the NiCrBSi-... The NiCrBSi-Y2O3 composite coatings were prepared on the surface of 45 carbon steel by plasma spray, the microstructure and tribological properties of the coatings were investigated. The results show that the NiCrBSi-Y2O3 composite coatings are mainly composed of γ-Ni, CrB, Cr7C3 and Y2O3. With addition of Y2O3, hard phases such as CrB, Cr7C3 emerge in composite coating, and the density of the composite coatings also increases. The NiCrBSi-0.5Y2O3 composite coating presents excellent tribological properties. Its friction coefficient is 0.175, which is about 37% of that of the pure NiCrBSi coating. The mass wear loss is 1.2 mg, which is reduced by 43% compared with the pure NiCrBSi coating. When the loads are 6-10 N, the NiCrBSi-0.5Y2O3 composite coating suffers from slight wear and the wear mechanisms are mainly adhesive wear accompany with slight micro-cutting wear and micro-fracture wear. As the load increases to 12 N, the wear mechanisms are adhesive wear and severe micro-cutting wear. 展开更多
关键词 plasma spray composite coating NICRBSI y2o3 friction WEAR
下载PDF
Synthesis of Al_2O_3/TiCN-0.2%Y_2O_3 Composite by Hot Pressing 被引量:1
4
作者 李喜坤 邱关明 +3 位作者 丘泰 赵海涛 白华 孙旭东 《Journal of Rare Earths》 SCIE EI CAS CSCD 2007年第3期291-295,共5页
Al2O3/TiCN composites were synthesized by hot pressing.The influences of components and HP temperature on mechanical properties,such as bending strength,breaking tenacity and Vickers hardness were investigated.The res... Al2O3/TiCN composites were synthesized by hot pressing.The influences of components and HP temperature on mechanical properties,such as bending strength,breaking tenacity and Vickers hardness were investigated.The results showed that the mechanical properties of Al2O3/TiCN composite increased with temperature when hot pressing temperature is below 1650 ℃.The mechanical properties reached their maximums when the composites were sintered at 1650 ℃ for 30 min under hot pressing pressure of 35 MPa,the value of bending strength,breaking tenacity and Vickers hardness was 1015 MPa,6.89 MPa·m1/2,and 20.82 MPa,respectively.When hot pressing temperature was above 1650 ℃,density decreased because of decomposition with increased temperature,and mechanical properties dropped because of rapid growth of grains in size at high temperature.Microstructure analysis showed that the addition of Y2O3 led to the formation of YAG phase so as to inhibit the growth of crystals.This helped to improve breaking tenacity of the composites.TiCN particles with diameters of 1 μm dispersed at Al2O3 grain boundaries,inhibited grain growth and enhanced mechanical properties of the composites.SEM study of the propagation of indentation cracks showed that the bridge linking behavior between matrix and strengthening phase might lead to the formation of the coexisted field of crack deflection,branching and bridge linking.The mechanism of this phenomenon was that the addition of Y2O3 improved the dispersion of TiCN particles so as to enhance the tenacity of the composites.The breaking tenacity was changed from 5.94 to 6.89 MPa·m1/2. 展开更多
关键词 composite Al2o3/TiCN y2o3 mechanical properties yTTRIUM rare earths
下载PDF
Fabrication and fracture analysis of MoSi_2 matrix composites by mechanical alloying
5
作者 马颖 郝远 +1 位作者 张德良 余宁 《中国有色金属学会会刊:英文版》 CSCD 2001年第6期847-851,共5页
Four composites, MoSi 2+ZrO 2, MoSi 2+ZrO 2(Y 2O 3), MoSi 2+ZrO 2+SiC and MoSi 2+ZrO 2(Y 2O 3)+SiC are fabricated by mechanical alloying. It is clear that cracks produced on the MoSi 2 matrix composites during hardnes... Four composites, MoSi 2+ZrO 2, MoSi 2+ZrO 2(Y 2O 3), MoSi 2+ZrO 2+SiC and MoSi 2+ZrO 2(Y 2O 3)+SiC are fabricated by mechanical alloying. It is clear that cracks produced on the MoSi 2 matrix composites during hardness testing belong to the Palmquist crack system. The value of highest fracture toughness of MoSi 2+ZrO 2+SiC composite is 7.58?MPa·m 1/2 , which is nearly three times that of monolithic MoSi 2. This can be attributed to well distributed ZrO 2 and SiC particles along the boundaries of very fine MoSi 2 grains. 展开更多
关键词 mechanical alloying compositeS fracture toughness MoSi 2 Zro 2 y 2o 3
下载PDF
用Y_2O_3Al_2O_3SiO_2Si_3N_4钎料连接氮化硅复相陶瓷
6
作者 周飞 李志章 罗启富 《材料研究学报》 EI CAS CSCD 北大核心 1999年第5期514-518,共5页
研究了用Y2O3Al2O3SiO2Si3N4 钎料对氮化硅复相陶瓷的连接. 对连接界面进行SEM、EPMA和XRD分析.接头强度随着保温时间、连接温度的增加而逐渐增加. 在达到峰值后,连接强度逐渐降低.在YAS钎... 研究了用Y2O3Al2O3SiO2Si3N4 钎料对氮化硅复相陶瓷的连接. 对连接界面进行SEM、EPMA和XRD分析.接头强度随着保温时间、连接温度的增加而逐渐增加. 在达到峰值后,连接强度逐渐降低.在YAS钎料中添加氮化硅, 可以降低接头界面的热应力,改善接头强度. 微观分析表明:接头强度的变化主要与界面反应和界面孔洞损伤有关. 展开更多
关键词 氮化硅 复相陶瓷 氧氮玻璃 连接强度 钎料
下载PDF
Sol-Gel法制备Al_2O_3-SiO_2-TiO_2-ZrO_2复合陶瓷膜的研究 被引量:4
7
作者 徐晓虹 吴建锋 +1 位作者 白占良 张英 《中国陶瓷》 CAS CSCD 2003年第6期21-23,共3页
将Sol-Gel法应用于无机膜的制备,成功的研制出一种新型的膜面平整、膜厚均匀且无宏观缺陷的Al2O3-SiO2-TiO2-ZrO2复合陶瓷膜,复合膜含有γ-Al2O3、SiO2、TiO2、ZrO2和Al2SiO5等晶相,改变体系组成含量,晶相组成和含量随之变化,从而引起... 将Sol-Gel法应用于无机膜的制备,成功的研制出一种新型的膜面平整、膜厚均匀且无宏观缺陷的Al2O3-SiO2-TiO2-ZrO2复合陶瓷膜,复合膜含有γ-Al2O3、SiO2、TiO2、ZrO2和Al2SiO5等晶相,改变体系组成含量,晶相组成和含量随之变化,从而引起膜的显微结构的变化。利用XRD、SEM、AFM、EPMA等测试手段重点研究了膜的表面形貌和显微结构,并分析了添加剂、热处理方式等对膜的表面形貌和显微结构影响。 展开更多
关键词 溶胶—凝胶法 Al2o3—Sio2—Tio2—Zro2复合陶瓷膜 表面形貌 显微结构
下载PDF
Characterization of SPEEK/Y_2O_3 proton exchange membrane treated with high magnetic field 被引量:1
8
作者 童菊英 郭强 +3 位作者 谭孝林 李夏 李丹 董云凤 《Journal of Rare Earths》 SCIE EI CAS CSCD 2011年第6期604-608,共5页
The membranes of sulfonated poly(etheretherketone) of 48.3% sulfonation degree doped with Y2O3 were prepared, and then treated with parallel high magnetic field of 6 and 12 T at 120 oC for 4 h, respectively. The sma... The membranes of sulfonated poly(etheretherketone) of 48.3% sulfonation degree doped with Y2O3 were prepared, and then treated with parallel high magnetic field of 6 and 12 T at 120 oC for 4 h, respectively. The small-angle X-ray scattering revealed that the struc- ture of the composite membranes would be changed by high magnetic field treatment. The cross-section morphology of the composite membranes by a scanning electron microscope showed that the Y2O3 could be dispersed evenly in the composite membranes which were relatively smooth and compact but formed small conglomeration with increasing Y2O3 content and treating high magnetic field. The water uptake of membranes would be reduced with Y2O3 content increasing, but not be modified by the treatment of high magnetic field. The proton conductivity of membranes would be increased with temperature rising from 20 to 60 oC, and improved under high magnetic field, which could all exceed 10–2 S/cm at 75% relative humidity, but decrease with doping content of Y2O3 from 2 wt.% to 8 wt.%. The methanol permeability of the composite membranes would be decreased with Y2O3 content increasing and slightly reduced after high magnetic field treatment. 展开更多
关键词 speek/y2o3 composite membrane high magnetic field proton conductivity rare earths
原文传递
Preparation and performance of coating on rare-earth compounds-immersed magnesium alloy by micro-arc oxidation 被引量:5
9
作者 刘峰 李玉洁 +3 位作者 顾佳婧 严青松 罗强 蔡启舟 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第7期1647-1654,共8页
A composite ceramic coating containing Y2O3-ZrO2-MgO(YSZ-MgO) was prepared on AZ91D magnesium alloy,which was immersed in Y(NO3)3 aqueous solution as pretreatment,by micro-arc oxidation(MAO) process.The morpholo... A composite ceramic coating containing Y2O3-ZrO2-MgO(YSZ-MgO) was prepared on AZ91D magnesium alloy,which was immersed in Y(NO3)3 aqueous solution as pretreatment,by micro-arc oxidation(MAO) process.The morphology,elemental and phase compositions,corrosion behavior and thermal stability of the coatings were studied by SEM,EDX,XRD,electrochemical corrosion test,high temperature oxidation and thermal shock test.The results show that the coating mainly consists of ZrO2,Y2O3,MgO,Mg2SiO4,and MgF2.Among these compounds,Y2O3 accounts for 26.7% of(Y2O3 + ZrO2).The thickness of YSZ-MgO coating is smaller than that of ZrO2-MgO coating,but its compactness and surface roughness are better than those of ZrO2-MgO coating.YSZ-MgO coating has a good corrosion resistance,and its corrosion rate in 5% NaCl aqueous solution is lower than that of ZrO2-MgO and only about 8.5% of that of AZ91D magnesium alloy.After oxidation at 410 °C,the mass gain of AZ91D magnesium alloy presents a linear increase with the oxidation time.The YSZ-MgO coating and ZrO2-MgO coating can remarkably decrease the oxidation mass gain.The oxidation mass gain of YSZ-MgO coating is lower than that of ZrO2-MgO coating,especially during a long oxidation period.The thermal shock resistance of YSZ-MgO coating is superior to ZrO2-MgO coating. 展开更多
关键词 AZ91D magnesium alloy micro-arc oxidation(MAo y2o3-Zro2-Mgo composite coating corrosion behavior thermal stability
下载PDF
Fabrication of Ce-doped(Gd2Y)Al5O12/Y3Al5O12 composite-phase scintillation ceramic 被引量:5
10
作者 Shuilin Chen Benxue Jiang +5 位作者 Yang Wang Qiangqiang Zhu Qinghua Yang Wanqiu Ma Ge Zhang Long Zhang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2019年第9期978-983,I0003,共7页
In this paper,a novel Ce(Gd2 Y)Al5O12/Ce:Y3Al5O12(Ce:GYAG/Ce:YAG)composite scintillation ceramic was designed and fabricated by a solid-state reaction method.The phase,luminescence and scintillation properties were in... In this paper,a novel Ce(Gd2 Y)Al5O12/Ce:Y3Al5O12(Ce:GYAG/Ce:YAG)composite scintillation ceramic was designed and fabricated by a solid-state reaction method.The phase,luminescence and scintillation properties were investigated.The Ce:GYAG/Ce:YAG composite ceramic consisting of two-phase has a broad emission band ranging from 500 to 750 nm.The total mass attenuation coefficient of Ce:GYAG/Ce:YAG is 0.3864 cm^-1,in between those of Ce:YAG and Ce:GYAG ceramics.In addition,the composite ceramic had a high light yield of 20430 ph/MeV.By controlling the ratio of GYAG and YAG,the composite ceramic can realize a spectrum design and total mass attenuation coefficient control to meet the requirements for wide-X-ray-energy-range detectors. 展开更多
关键词 Ce:(Gd2y)Al5o12/Ce:y3Al5o12 composite CERAMIC SPECTRUM control X-ray energy RARE earths
原文传递
Preparation of Al2O3/Y2O3 composite coating for deuterium permeation reduction 被引量:1
11
作者 Weijing Wang Qinghe Yu +1 位作者 Xiaopeng Liu Zheng Lu 《Journal of Rare Earths》 SCIE EI CAS CSCD 2020年第11期1237-1242,I0004,共7页
A tritium permeation barrier is required in fusion blankets for the reduction of fuel loss and radiological hazard.In this study,an Al2O3/Y2O3 composite coating was prepared on 316 L stainless steel by radiofrequency ... A tritium permeation barrier is required in fusion blankets for the reduction of fuel loss and radiological hazard.In this study,an Al2O3/Y2O3 composite coating was prepared on 316 L stainless steel by radiofrequency magnetron sputtering in order to improve the tritium permeation resistance.The microstructure and the phase composition of the Al2O3/Y2O3 composite coating are observed by scanning electron microscopy,transmission electron microscopy and grazing incidence X-ray diffraction.Moreover,Auger electron spectroscopy was used to characterize the depth profiles of Al,Y and O elements.The results clearly indicate that the Al2O3/Y2O3 composite coating is fully dense and the total thickness is approximately 340 nm.The Al2O3/Y2O3 coating consists of an amorphous Al2O3 and the cubic Y2O3,in which Al,Y and O elements are homogeneously distributed in the vertical base direction.Furthermore,the deuterium permeation property of the Al2O3/Y2O3 composite coating was measured by the gas phase permeation method.The results show that the introduction of an interface and the existence of a tiny amount of micro-defects improve the deuterium resistance of the Al2O3/Y2O3 coating,and its deuterium permeation reduction factor is 536-750 at 873-973 K.Therefore,it is concluded that the Al2O3/Y2O3 co mposite coating as deuterium permeation barrier can significa ntly enha nce the deuterium permeation resistance property. 展开更多
关键词 DEUTERIUM Permeation barrier Al2o3 coating y2o3 coating composite coating Rare earths
原文传递
Preparation and sintering of nanometer W-2 wt.% Y_2O_3 composite powders 被引量:1
12
作者 李长记 刘实 +1 位作者 熊良银 王文涛 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第7期752-757,共6页
W-2 wt.%Y2O3 composite material with uniform distribution of yttrium element was fabricated through processes of mechanical alloying (MA) and spark plasma sintering (SPS). The relevant productions were characteriz... W-2 wt.%Y2O3 composite material with uniform distribution of yttrium element was fabricated through processes of mechanical alloying (MA) and spark plasma sintering (SPS). The relevant productions were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The XRD showed that the W-2 wt.%Y2O3 composite powder, including tungsten matrix and Y2O3 particles, was refined to nanometer sizes during the MA process. The SEM and TEM micrographs showed that the MA produced composite powder presented a lamellar morphology and contained many dislocations and microcracks. The EDS showed that the Y and O elements were uniformly distributed in the W matrix after mechanically alloying for 15 h. The W-2 wt.%Y2O3 composite material with uniform distribution of yttrium was obtained by sintering of the MA produced composite powder. 展开更多
关键词 W-2 wt.%y2o3 composite material lamellar nanometer powder uniform distribution of y MA SPS rare earths
原文传递
Phase evolution, microstructure and properties of Y_2O_3-doped TiCN-based cermets 被引量:3
13
作者 孙万昌 张佩 +2 位作者 李攀 佘晓林 赵坤 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第8期867-873,共7页
Y2O3-doped TiCN-based cermets were prepared by pressureless sintering with powders TiC, TiN, Ni, etc. as main starting materials. The influence of sintering processes and Y2O3 on properties of TiCN-based cermets were ... Y2O3-doped TiCN-based cermets were prepared by pressureless sintering with powders TiC, TiN, Ni, etc. as main starting materials. The influence of sintering processes and Y2O3 on properties of TiCN-based cermets were investigated. The phase composition of TiCN-based cermets almost had no change with Y2O3 addition. The fullly densified TiCN-based cermets were achieved by P-2 sitering process. The fracture surface showed lots of small dimples caused by hard phase particles pulling-off, and the left hard phase particles were attached to the arborous dendritic matrix. The Vickers hardness, fracture toughness and bending strength of TiCN-based cermets increased firstly and then decreased with the increment of Y2O3 content. When Y2O3 contents were both 0.8 wt.%, compared with the P-1 sintered samples, the Vickers hardness, fracture toughness and bending strength of the P-2 sintered sampies reached 14.84 GPa, 8.66 MPa-m1/2 and 660.4 MPa, which were increased by 7.9%, 6.1% and 45.8%, respectively. 展开更多
关键词 TiCN-based cermets sintering process rare earth y2o3 phases composition microstructure mechanical properties
原文传递
HEATING AND SINTERING CHARACTERISTICS OF Y-TZP AND Y-TZP/Al_2O_3 BY MICROWAVE
14
作者 施剑林 田永赉 +2 位作者 李包顺 郭景坤 严东生 《Science China Mathematics》 SCIE 1992年第9期1144-1152,共9页
Dense Y-TZP ceramics and Y-TZP/Al_2O_3 composite ceramics are prepared successfully by microwave sintering using rectangle single mode (TE_(10n)) applicator. The heating characteristcs by microwave of the materials ar... Dense Y-TZP ceramics and Y-TZP/Al_2O_3 composite ceramics are prepared successfully by microwave sintering using rectangle single mode (TE_(10n)) applicator. The heating characteristcs by microwave of the materials are related to the sample compositions. Higher Y-TZP content leads to a higher heating-up rate and a shorter time period needed for heating-up. The input power, short circuit plug position and the opening size of adjustable coupling iris are adjusted timely to maintain the resonance and the optimum coupling condition, and therefore a certain heating-up rate and final stable sintering temperature could be achieved. Relative densities above 98% TD are obtained for Y-TZP and 20 Vol% Al_2O_3-Y-TZP composite ceramics, with their grain sizes of about 0.4 and 1.0 μm, respectively. It is also found that the sample center can be over-sintered when the temperature is too high since a higher temperature at the sample center is usually reached than that at the surface. 展开更多
关键词 y-TZP Al_2o_3 microwave sintering composite ceramics.
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部