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Development and Characterization of Aluminium-Based Metal Matrix Composites
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作者 M. A. Gafur Al Fahad Ahmed +1 位作者 Raisul Abrar Surya Sabrin Soshi 《Materials Sciences and Applications》 CAS 2023年第1期1-19,共19页
Aluminum based metal matrix composites were fabricated using stir casting where silicon carbide and alumina were the reinforcements. Different types of properties (physical-density, mechanical-tensile, hardness, chemi... Aluminum based metal matrix composites were fabricated using stir casting where silicon carbide and alumina were the reinforcements. Different types of properties (physical-density, mechanical-tensile, hardness, chemical-corrosion etc.) were measured and compared with base metals/alloys. The properties were significantly varied. The highest density was obtained for pure aluminium with 5% Al<sub>2</sub>O<sub>3</sub> whereas the lowest was obtained for AA-4032 alloy. The highest hardness was obtained for AA-4032 with 5% Al<sub>2</sub>O<sub>3</sub> whereas the lowest was obtained for pure Al with 5% Al<sub>2</sub>O<sub>3</sub>. The highest strength was obtained for AA-6061 with 5% coarse SiC whereas the lowest was obtained for pure Al. The highest impact strength was obtained for AA-4032 with 5% Al<sub>2</sub>O<sub>3</sub> whereas the lowest was obtained for AA-6061. The corrosion resistance of all composites was lower than that of the base materials. 展开更多
关键词 Al AA-6061 AA-4032 SiC al2o3 Stir-Casting Metal Matrix Composite MMC NANOCOMPOSITES
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柠檬酸对Ni_2P/TiO_2-Al_2O_3催化剂加氢脱硫性能的影响 被引量:13
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作者 宋华 张永江 +1 位作者 宋华林 代敏 《物理化学学报》 SCIE CAS CSCD 北大核心 2012年第3期661-666,共6页
采用溶胶-凝胶法制备了TiO2-Al2O3复合载体,以柠檬酸(CA)为络合剂采用浸渍法制备了Ni2P负载的TiO2-Al2O3复合载体催化剂,并用X射线衍射(XRD)、N2吸附比表面积测定、H2程序升温氢还原(H2-TPR)、程序升温氧化(TPO)、X射线光电子能谱(XPS)... 采用溶胶-凝胶法制备了TiO2-Al2O3复合载体,以柠檬酸(CA)为络合剂采用浸渍法制备了Ni2P负载的TiO2-Al2O3复合载体催化剂,并用X射线衍射(XRD)、N2吸附比表面积测定、H2程序升温氢还原(H2-TPR)、程序升温氧化(TPO)、X射线光电子能谱(XPS)技术对催化剂的结构和性质进行了表征,考察了CA/Ni摩尔比对在Ni2P/TiO2-Al2O3催化剂上进行的二苯并噻吩(DBT)加氢脱硫(HDS)性能的影响.结果表明:适量的CA可以丰富催化剂的孔道,提高催化剂的比表面积.当n(CA)/n(Ni)=2:1时,催化剂的比表面积达到126.75m2·g-1,与不加CA时相比,提高了57.05m2·g-1.调节n(CA)/n(Ni)能够改善活性相的分布,改变活性相的种类;引入CA使Ni和P前驱体的还原温度明显降低,促进活性相Ni2P的生成,一定程度上能够抑制催化剂表面炭的形成和沉积,提高其稳定性.n(CA)/n(Ni)=2:1时,催化剂具有最好的加氢脱硫活性,在360°C,3.0MPa,氢油比为500(V/V),液时体积空速为2.0h-1的条件下,二苯并噻吩转化率为99.5%,可将模拟油中硫含量由2%(w)降低到0.01%(w). 展开更多
关键词 加氢脱硫 磷化二镍 二氧化钛 三氧化二铝 柠檬酸 络合剂
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Interface characteristics of Al_2O_3-13%TiO_2 ceramic coatings prepared by laser cladding 被引量:3
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作者 高雪松 田宗军 +1 位作者 刘志东 沈理达 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第10期2498-2503,共6页
Al2O3-13%TiO2 (mass fraction) coatings, prepared by laser cladding on nickel-based alloy, were heated using high frequency induction sources. The coating microstructure and the interface between bond coating and cer... Al2O3-13%TiO2 (mass fraction) coatings, prepared by laser cladding on nickel-based alloy, were heated using high frequency induction sources. The coating microstructure and the interface between bond coating and ceramic coating were characterized by SEM, XRD and EDS. The results show that two-layer substructure exists in the ceramic coating: one layer evolving from fully melted region where the sintered grains grow fully; another layer resembling the liquid-phase-sintered structure consisting of three-dimensional net where the melted Al2O3 particles are embedded in the TiO2-rich matrix. The mechanism of the two-layer substructure formation is also explained in terms of the melting and flattening behavior of the powders during laser cladding processing. The spinel compounds NiAl2O4 and acicular compounds Cr2O3 are discovered in the interface between bond coating and ceramic coating. It proves that the chemical reactions in the laser cladding process will significantly enhance the coating adhesion. 展开更多
关键词 ceramic coating nickel alloy laser cladding al2o3-TiO2 high frequency induction
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烧结 - 溶解法制备铝基纳米复合泡沫材料的性能及耐腐蚀行为研究 被引量:1
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作者 吕刚磊 朱永刚 张静 《材料保护》 CAS CSCD 2021年第12期49-54,共6页
为研究铝基纳米复合金属泡沫材料的性能及其腐蚀行为,首先,采用粉末冶金烧结-溶解工艺(SDP)制备了不同相对密度(孔隙率)的Al基Al_(2)O_(3)纳米颗粒增强复合金属泡沫材料,并以NaCl颗粒作为填充剂,研究了纳米颗粒增强剂和不同数量的NaCl... 为研究铝基纳米复合金属泡沫材料的性能及其腐蚀行为,首先,采用粉末冶金烧结-溶解工艺(SDP)制备了不同相对密度(孔隙率)的Al基Al_(2)O_(3)纳米颗粒增强复合金属泡沫材料,并以NaCl颗粒作为填充剂,研究了纳米颗粒增强剂和不同数量的NaCl空隙保持剂(对应不同的孔隙率)对样品微观结构、形貌、密度、硬度和电化学性能的影响。结果表明:随着相对密度从60%增加到70%,泡沫材料的壁厚从200μm增加到300μm,导致孔径减小。此外,纳米颗粒增强剂的加入和相对密度的增加导致了泡沫金属硬度的提高。电化学测试结果表明,增加Al_(2)O_(3)含量可以降低腐蚀速率,但增加孔隙率则可以提高腐蚀速率。 展开更多
关键词 铝-氧化铝纳米复合材料 金属泡沫 烧结-溶解 腐蚀行为
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水润滑条件下磨粒尺寸对橡胶密封副摩擦学行为的影响 被引量:10
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作者 沈明学 李波 +4 位作者 容康杰 袁超颖 张执南 张坚 熊光耀 《摩擦学学报》 EI CAS CSCD 北大核心 2020年第2期252-259,共8页
磨粒磨损是各类机械橡塑密封装备的一种典型失效形式.本文中开展了水润滑条件下磨粒尺寸对O型橡胶密封配副摩擦学行为的影响研究,分析了不同颗粒尺寸下的摩擦系数时变特性,探讨了不同运行阶段下的磨损形貌、颗粒运动特性和损伤失效机制... 磨粒磨损是各类机械橡塑密封装备的一种典型失效形式.本文中开展了水润滑条件下磨粒尺寸对O型橡胶密封配副摩擦学行为的影响研究,分析了不同颗粒尺寸下的摩擦系数时变特性,探讨了不同运行阶段下的磨损形貌、颗粒运动特性和损伤失效机制.结果表明:颗粒尺寸对橡胶/金属密封副的摩擦学性能有重要影响;研究发现了影响摩擦系数和损伤机制的两个颗粒尺寸临界值;当颗粒尺寸大于临界值约75μm时,颗粒难以穿过密封界面,但少数颗粒能嵌入到摩擦副的接触区两侧,犁削作用下的金属表面产生较深的犁沟;当颗粒尺寸介于两临界值内时,接触副两侧形成“颗粒嵌入带”,颗粒以单独或颗粒群形式嵌入到橡胶内,尽管犁削了配副金属但也起到了良好的承载作用,表现出较低的摩擦系数并减缓了橡胶的磨损;当颗粒尺寸约小于另一临界值12.5μm时,颗粒能较自由地通过摩擦界面,对配副金属表面起到了抛光效应,但也加速了橡胶的冲蚀磨损,橡胶磨损表面呈现“突脊-犁沟-突脊”交替特征,因此工程上应尽量避免此类现象的发生. 展开更多
关键词 橡胶密封 磨粒磨损 氧化铝颗粒 砂轮效应 颗粒嵌入
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NF_3 decomposition over some metal oxides in the absence of water 被引量:3
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作者 Xianjun Niu Liang Sun YananWang Haioeng Wu Xiufeng Xu 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2010年第5期463-467,共5页
NF3 decomposition in the absence of water over Al2O3, Fe2O3, Co3O4 and NiO, and transition metal oxides (Fe203, CO3O4 and NiO) coated Al2O3 reagents was investigated. The results show that Al2O3 is an active reagent... NF3 decomposition in the absence of water over Al2O3, Fe2O3, Co3O4 and NiO, and transition metal oxides (Fe203, CO3O4 and NiO) coated Al2O3 reagents was investigated. The results show that Al2O3 is an active reagent for NF3 decomposition with 100% conversion lasting for 8.5 h at 400 ℃. Fe203, Co3O4 and NiO coated Al2O3 reagents are superior to bare Al2O3, and 5%Co3O4/Al2O3 has a high reactivity with NF3 full conversion maintaining for 10.5 h. It is suggested that the presence of transition metal oxide is beneficial to the reactivity of Al2O3, and results in a significant enhancement in the fluorination of Al2O3. 展开更多
关键词 NF3 decomposition metal oxides al2o3 REACTIVITY
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Influence of Reinforcement Type on Microstructure, Hardness, and Tensile Properties of an Aluminum Alloy Metal Matrix Composite 被引量:4
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作者 Belete Sirahbizu Yigezu Manas Mohan Mahapatra Pradeep Kumar Jha 《Journal of Minerals and Materials Characterization and Engineering》 2013年第4期124-130,共7页
This paper presents the results of the comparative study of as cast microstructures and mechanical properties viz yield strength, ultimate tensile strength, elastic modulus, percentage elongation, hardness, percentage... This paper presents the results of the comparative study of as cast microstructures and mechanical properties viz yield strength, ultimate tensile strength, elastic modulus, percentage elongation, hardness, percentage porosity and fracture characteristic of 5 wt% SiC and Al2O3 particulate reinforced Al-4% Cu-2.5% Mg matrix composites. These composite materials were prepared through stir casting process. Quantitative metallographic techniques were utilized to determine the average grain size of particles. The microstructures and tensile fracture characteristic of the representative samples of the composites were examined using optical microscope (OM), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-ray diffraction (XRD) techniques. The experimental results demonstrate a fairly uniform distribution of 50.8 μm Al2O3 and 49.2 μm SiC spherical particles with some clustering in few areas. At the interfaces of Al2O3 and the matrix, MgO and MgAl2O4 were observed. Similarly, Al4C3 was formed at the interfaces between SiC and the matrix. The mechanical property test results revealed that, for the same weight percentage of reinforcement, Al-4% Cu-2.5% Mg/5 wt% SiC composite exhibit a 15.8%, 16.4%, 4.97% and 10.8% higher yield strength, ultimate tensile strength, elastic modulus, and hardness, respectively. On the other hand, even if some porosity was observed in the Al2O3 reinforced composite, the percentage elongation (ductility) was 31% higher than that of SiC rein-forced composite. The tensile specimen of SiC reinforced composite failed in a brittle fashion without neck formation, whereas the Al2O3 reinforced composite failed in a ductile fashion with noticeable neck formation. 展开更多
关键词 al2o3 CASTING Intermetalics Metal MATRIX Composites METALLOGRAPHY SiC
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PEO processing of AZ91Nd/Al_(2)O_(3) MMC-the role of alumina fibers 被引量:2
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作者 Ting Wu Carsten Blawert +4 位作者 Maria Serdechnova Polina Karlova Gleb Dovzhenko D.C.Florian Wieland Mikhail L Zheludkevich 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2022年第2期459-476,共18页
This work reports the influence of alumina fiber reinforcement of an AZ91Nd MMC(metal matrix composite)on the PEO coating formation process in a sodium phosphate-based electrolyte.By comparison with the pure AZ91Nd,th... This work reports the influence of alumina fiber reinforcement of an AZ91Nd MMC(metal matrix composite)on the PEO coating formation process in a sodium phosphate-based electrolyte.By comparison with the pure AZ91Nd,the evolution of alumina fiber during the processing and the characteristics of the resultant PEO coating were investigated.The voltage response as a function of processing time was changed.Lower voltage in the presence of alumina fiber is responsible for the lower coating thickness.The morphology and phase composition of the coatings are also influenced by the incorporation of the fiber.Firstly,the fiber is embedded in the coating and interrupts the continuity of the coating.With increasing processing time,the fiber is found to be reactively incorporated in the coating.The intention to produce a MgAl_(2)O_(4)containing coating is achieved and it is mainly accumulated near the coating surface.However,due to the low number of fibers,the Al content is overall still low and only near to the fibers the MgAl_(2)O_(4)spinel phase can form. 展开更多
关键词 Plasma electrolytic oxidation Mg alloy Metal matrix composite al2o3 MgAl_(2)O_(4)
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Taguchi approach to influence of processing parameters on erosive wear behaviour of Al7034-T6 composites 被引量:1
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作者 B.A.MUDASAR PASHA Kaleemulla MOHAMED 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第10期2163-2171,共9页
Taguchi technique was used to predict the influence of processing parameters on the erosive wear behavior Al7034-T6composite reinforced with SiC and Al2O3particles in different mass fractions.These hybrid metal matrix... Taguchi technique was used to predict the influence of processing parameters on the erosive wear behavior Al7034-T6composite reinforced with SiC and Al2O3particles in different mass fractions.These hybrid metal matrix composites(HMMCs)werefabricated by using a simple technique called stir casting technique.Scanning electron microscope(SEM)was used to study thesurface morphology of the composite and its evolution according to processing time.The design of experiment(DOE)based onTaguchi’s L16orthogonal array was used to identify various erosion trials.The most influencing parameter affecting the wear rate wasidentified.The results indicate that erosion wear rate of this hybrid composite is greatly influenced more by filler content and impactvelocity respectively compared to other factors.This also shows the significant wear resistance with the increase in the filler contentsof SiC and Al2O3particles,respectively. 展开更多
关键词 hybrid metal matrix composite erosive wear stir casting SIC al2o3 Taguchi design
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Effect of the Si-doped In_(0.49)Ga_(0.51)P barrier layer on the device performance of In_(0.4)Ga_(0.6)As MOSFETs grown on semi-insulating GaAs substrates 被引量:1
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作者 常虎东 孙兵 +4 位作者 薛百清 刘桂明 赵威 王盛凯 刘洪刚 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第7期463-466,共4页
In0.4Ga0.6As channel metal-oxide-semiconductor field-effect transistors (MOSFETs) with and without an Si-doped In0.49Ga0.51P barrier layer grown on semi-insulating GaAs substrates have been investigated for the firs... In0.4Ga0.6As channel metal-oxide-semiconductor field-effect transistors (MOSFETs) with and without an Si-doped In0.49Ga0.51P barrier layer grown on semi-insulating GaAs substrates have been investigated for the first time. Compared with the In0.4Ga0.6As MOSFETs without an In0.49Ga0.51P barrier layer, In0.4Ga0.6As MOSFETs with an In0.49Ga0.51P barrier layer show higher drive current, higher transconductance, lower gate leakage current, lower subthreshold swing, and higher effective channel mobility. These In0.4Ga0.6As MOSFETs (gate length 2 μm) with an In0.49Ga0.51P barrier layer exhibit a high drive current of 117 mA/mm, a high transconductance of 71.9 mS/mm, and a maximum effective channel mobility of 1266 cm2/(V·s). 展开更多
关键词 metal–oxide–semiconductor field-effect transistor INGAAS INGAP al2o3
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Theoretical Analysis on Tensile Strength of ZA22/Al_2O_3 Short Fiber Composite Added with Ce
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作者 于思荣 何镇明 任露泉 《Journal of Rare Earths》 SCIE EI CAS CSCD 1998年第2期31-36,共6页
The tensile strength of squeeze casting ZA22/Al 2O 3 short fiber composite was measured with autograph AG 10TA universal testing machines made in Japan. The experimental results were analysed with the rule of mixtu... The tensile strength of squeeze casting ZA22/Al 2O 3 short fiber composite was measured with autograph AG 10TA universal testing machines made in Japan. The experimental results were analysed with the rule of mixture(ROM) model modified by Friend. The theoretical analysis agree well with the experimental results. Under the test condition of this study, the strengthening critical fiber volume fraction predicted is 34 5%. Because fiber volume fraction in the composite is under this value, the tensile strength of the composite is lower than that of ZA22 alloy matrix. 展开更多
关键词 Rare earths ZA22 Al 2O 3 CERIUM Metal matrix composites Tensile strength
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Comments on“Adsorption behavior of heavy metal ions by carbon nanotubes grown on microsized Al_2O_3 particles”
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作者 Yuh-Shan Ho 《Journal of University of Science and Technology Beijing》 CSCD 2008年第3期366-366,共1页
Recently, Hsieh and Horng [1] published the paper entitled as above. In section 3 results and discussion, the authors mentioned the first and the second order kinetic models without any quotations. In fact these two k... Recently, Hsieh and Horng [1] published the paper entitled as above. In section 3 results and discussion, the authors mentioned the first and the second order kinetic models without any quotations. In fact these two kinetic models have been published [2-5]. In order to distinguish a kinetics model based on the ad- sorption capacity of a solid from the one based on the concentration of a solution, Lagergren's first-order rate equation has been called pseudo-first-order [6-7]. The Lagergren's equation has been widely cited, but there are far more mistakes made in the quotation and in the reference section of papers, including the title, the author's name, journal title, year of publishing, volume, and page number [3]. In addition, the second order kinetic expression for the adsorption systems of divalent metal ions using sphagnum moss peat has been reported by Ho [8]. 展开更多
关键词 Adsorption behavior of heavy metal ions by carbon nanotubes grown on microsized al2o3 particles HO RATE Comments on
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Preparation of SiC_p/Al_2O_3-Al Composites by Directed Metal Oxidation
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作者 LIN Ying YANG Hai-bo WANG Fen ZHU Jian-feng 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2006年第B12期47-50,共4页
SiCp/Al2O3-Al composites were synthesized by means of direct metal oxidation method. The composition and microstructures of the composites were investigated using X-ray diffraction (XRD), scanning electron microsco... SiCp/Al2O3-Al composites were synthesized by means of direct metal oxidation method. The composition and microstructures of the composites were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM) and metallurgical microscope. The effects of technical parameters on the properties of the product were analyzed. The results indicate that the composite possesses a dense microstructure, composed of three interpenetrated phases. Of them, SiO2 layer prohibits the powdering of the composites; Mg promotes the wetting and infiltration of the system and Si restricts the interfacial reaction while improving the wetting ability between reinforcement and matrix. 展开更多
关键词 SiCD/al2o3-Al composites: directed metal oxidation Al-Mg-Si alloy SiC reinforcement
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Identification of Growth Promoter to Fabrication SiCp/Al<sub>2</sub>O<sub>3</sub>Ceramic Matrix Composites Prepared by Directed Metal Oxidation of An Al Alloy
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作者 Malkapuram Devaiah Thodeti Srihari Thankappan Pillai Rajasekharan 《Journal of Minerals and Materials Characterization and Engineering》 2012年第11期1063-1068,共6页
SiC particulates reinforced alumina matrix composites were fabricated using Directed Metal Oxidation (DIMOX) process. Continuous oxidation of an Al-Si-Mg-Zn alloy with different interlayers (dopents) as growth promote... SiC particulates reinforced alumina matrix composites were fabricated using Directed Metal Oxidation (DIMOX) process. Continuous oxidation of an Al-Si-Mg-Zn alloy with different interlayers (dopents) as growth promoters, will encompasses the early heating of the alloy ingot, melting and continued heating to temperature in the narrow range of 950°C to 980°C in an atmosphere of oxygen. Varying interlayers (dopents) are incorporated to examine the growth conditions of the composite materials and to identification of suitable growth promoter. The process is extremely difficult because molten aluminum does not oxidize after prolonged duration at high temperatures due to the formation of a passivating oxide layer. It is known that the Lanxide Corporation had used a combination of dopents to cause the growth of alumina from molten metal. This growth was directed, i.e. the growth is allowed only in the required direction and restricted in the other directions. The react nature of the dopants was a trade secret. Though it is roughly known that Mg and Si in the Al melt can aid growth, additional dopents used, the temperatures at which the process was carried out, the experimental configurations that aided directed growth were not precisely known. In this paper we have evaluated the conditions in which composites can be grown in large enough sizes for evaluation application and have arrived at a procedure that enables the fabrication of large composite samples by determining the suitable growth promoter (dopant). Scanning electron microscopic, EDS analysis of the composite was found to contain a continuous network of Al2O3, which was predominantly free of grain-boundary phases, a continuous network of Al alloy. Fabrication of large enough samples was done only by the inventor company and the property measurements by the company were confirmed to those needed to enable immediate applications. Since there are a large number of variable affecting robust growth of the composite, fabrication large sized samples for measurements is a difficult task. In the present work, to identify a suitable window of parameters that enables robust growth of the composite has been attempted. 展开更多
关键词 Ceramic-Matrix Composites Scanning Electron Microscopy Liquid Metal INFILTRATION al2o3 SiC
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Al_2O_3-SiC-C Bricks for Hot Metal Pretreatment
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作者 Yu Lingyan 《China's Refractories》 CAS 2010年第2期44-46,共3页
1 Scope This standard specifies the classification, shape and dimensions, technical requirements, test methods, quality appraisal procedures, packing, marking, transportation, storage, and quality certificate of Al2O... 1 Scope This standard specifies the classification, shape and dimensions, technical requirements, test methods, quality appraisal procedures, packing, marking, transportation, storage, and quality certificate of Al2O3- SiC - C bricks for hot metal pretreatment. 展开更多
关键词 SIC al2o3-SiC-C Bricks for Hot Metal Pretreatment
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Al_2O_3-SiC-C Bricks for Hot Metal Pretreatment
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作者 Yu Lingyan 《China's Refractories》 CAS 2008年第4期34-35,共2页
1 Scope This standard specifies the classification, techni- cal requirements, test methods, inspection rules, packing, marking, transportation, storage and quality certificate of Al2O3- SiC - C bricks for hot metal p... 1 Scope This standard specifies the classification, techni- cal requirements, test methods, inspection rules, packing, marking, transportation, storage and quality certificate of Al2O3- SiC - C bricks for hot metal pretreatment. 展开更多
关键词 al2o3-SiC-C Bricks for Hot Metal Pretreatment SIC
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高磷铁水用CaO-Fe2O3-Al2O3渣系脱磷的实验研究
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作者 李杰 王志 +3 位作者 夏云进 芮其宣 陶素芬 陈良军 《冶金工程》 2020年第2期54-64,共11页
以CaO-Fe2O3-Al2O3渣系为研究对象,利用Factsage热力学软件计算渣系组成对其熔点、粘度及组元活度的影响,通过热态实验研究渣系钙氧比及渣中w(Al2O3)对高磷铁水脱磷的影响。结果表明:CaO-Fe2O3-Al2O3渣系熔化温度随渣系钙氧比的增大而升... 以CaO-Fe2O3-Al2O3渣系为研究对象,利用Factsage热力学软件计算渣系组成对其熔点、粘度及组元活度的影响,通过热态实验研究渣系钙氧比及渣中w(Al2O3)对高磷铁水脱磷的影响。结果表明:CaO-Fe2O3-Al2O3渣系熔化温度随渣系钙氧比的增大而升高,随w(Al2O3)的增大而降低;渣系粘度随渣系钙氧比增大而升高;渣系中CaO组元活度随着w(Al2O3)增大而降低,随钙氧比增大先大幅度升高后略有降低;渣系中Fe2O3组元活度随钙氧比增大先大幅度降低后略有降低,随w(Al2O3)增大略有波动。渣系的脱磷能力随着钙氧比的逐渐增大先略有增大后快速降低;钙氧比为0.45,w(Al2O3) = 1%~5%时,渣系脱磷率维持在90%以上。C2S-C3P固溶体相是熔渣中磷的主要富集相,C3P以扩散和析出的形式与熔渣中的2CaO&#183;SiO2结合生成C2S-C3P固溶体。 展开更多
关键词 CaO-Fe2O3-Al2O3渣系 高磷铁水 熔化温度 粘度 脱磷
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Synthesis and Investigation of the Activity of Cu-Cr-Co/Al2O3/Al-Catalysts in the Microwave Radiation-Stimulated Reaction Joint Deep Oxidation of Hydrocarbons and Carbon Monoxide
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作者 Peri A. Muradova Yuriy N. Litvishkov 《Modern Research in Catalysis》 CAS 2016年第1期11-18,共8页
This article shows main principles and presents ideas described in the scientific and technical literature, on the mechanism of interaction of microwave radiation with a solid phase materials, which were used as a bas... This article shows main principles and presents ideas described in the scientific and technical literature, on the mechanism of interaction of microwave radiation with a solid phase materials, which were used as a basis of creation of new perspective, energy efficient and environmentally safe technologies of preparation of heterogeneous catalysts for the reactions which were carried out under the influence of electro-magnetic radiation of microwave radiation. Author’s research results confirm possibilities of practical use of proposed method of hydrothermal oxidation of industrial low-dispersing of aluminum powders with presence of bulk phase of Al(ОН)<sub>3</sub>·nH<sub>2</sub>O, with further thermal treatment in microwave field for acquisition of armored А1/А1<sub>2</sub>О3<sub>3</sub> compositions, which effectively consume energy of microwave radiation. Due to the textured characteristics and thermo-transforming ability, synthesized components can be used as potential universal bearings of catalysts for reactions stimulated by electromagnetic radiation of (2.45 GHz) microwave frequency. 展开更多
关键词 Microwave Radiation Heterogeneous Catalysis γ-A12O3/Al-Carrier Conversion of Exhaust Gas Carbon Monoxide Oxides of Metals with Variable Valence
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Effect of Al_2O_3 addition on the non-isothermal crystallization kinetics and long-term stability of BCABS sealing glass for IT-SOFCs 被引量:4
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作者 Zuzhi HUANG Linghong LUO +4 位作者 Liangguang LIU Leying WANG Liang CHENG Xu XU Yefan WU 《Journal of Advanced Ceramics》 SCIE CSCD 2018年第4期380-387,共8页
Owing to adjustable thermal expansion performance, BaO–CaO–Al_2O_3–B_2O_3–SiO_2(BCABS) glass has a promising commercialization prospect for intermediate temperature-solid oxide fuel cells(IT-SOFCs) sealing. Herein... Owing to adjustable thermal expansion performance, BaO–CaO–Al_2O_3–B_2O_3–SiO_2(BCABS) glass has a promising commercialization prospect for intermediate temperature-solid oxide fuel cells(IT-SOFCs) sealing. Herein, Al_2O_3 with two different contents was added into the same glass formulation, referred to as A and B glass, respectively. In terms of the non-isothermal crystallization kinetic behavior, the effect of Al_2O_3 as the unique intermediate was innovatively studied on the long-term performance of BCABS sealing glass. After the heat treatment at 1023 K for 100 h, the change of the network structure and the expansion coefficient of the glass were characterized. The results showed that the addition of Al_2O_3 as a network forming body could enhance the structure of glass, and increase the activation energy for glass transition, which could effectively inhibit the crystallization ability of sealing glass. Therefore, the B glass with the higher Al_2O_3 content showed the better long-term sealing ability, which was greatly beneficial for IT-SOFCs sealing. 展开更多
关键词 INTERMEDIATE temperature-solid oxide fuel cell (IT-SOFC) BaO-CaO-al2o3-B2O3-SiO2 (BCABS)sealing glass al2o3 NON-ISOTHERMAL crystallization kinetics long-term stability
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Effect of pretreatment on Pd/Al_2O_3catalyst for catalytic oxidation of o-xylene at low temperature 被引量:17
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作者 Shaoyong Huang Changbin Zhang Hong He 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2013年第6期1206-1212,共7页
The effect of pretreatment on Pd/Al2O3 catalysts for the catalytic oxidation of o-xylene at low temperature was studied by changing the pretreatment and testing conditions. The fresh and pretreated Pd/Al2O3 catalysts ... The effect of pretreatment on Pd/Al2O3 catalysts for the catalytic oxidation of o-xylene at low temperature was studied by changing the pretreatment and testing conditions. The fresh and pretreated Pd/Al2O3 catalysts were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The results showed that the pretreatment dramatically changed the Pd/PdO ratio and then significantly affected the Pd/Al2O3 activity; while the pretreatment had not much influence on Pd particle size. The Pd/Al2O3 pre-reduced at 300~C/400~C, which has fully reduced Pd species, showed the highest activity; while the fresh Pd/Al2O3, which has fully oxidized Pd species, presented the worst performance, indicating the Pd chemical state plays an important role in the catalytic activity for the o-xylene oxidation. It is concluded that metallic Pd is the active species on the Pd/Al2O3 catalyst for the catalytic oxidation of o-xylene at low temperature. 展开更多
关键词 PD/al2o3 O-XYLENE catalytic oxidation noble metal VOC
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