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Influence of sintering time on microstructure and properties of hot oscillatory pressing sintered W–Cu refractory alloys

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Tungsten 2024年第2期6卷 323-332页

作者： Zi-Qian Wu Wei Zhao Ka Gao Shi-Hao Du Qing-Quan Kong De-Jian Sun Yang Gao School of Materials Science and Engineering Zhengzhou University of AeronauticsZhengzhou 450015China School of Mechanical Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of General Medicine Changhai HospitalShanghai 200000China Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and TechnologyWuhan 430081China Sichuan Province Engineering Technology Research Center of Powder Metallurgy Chengdu UniversityChengdu 610106China

W–Cu refractory alloys are widely used in aerospace,aviation,electronics,power,and other fi ***,because of its large melting point diff erence between alloy elements,the conventional powder metallurgy method required a long time of high temperature sintering is very likely to cause low density and abnormal grain size ***,90W-10Cu refractory alloys were successfully prepared by hot oscillatory pressing(HOP)under diff erent sintering time in this *** the infl uence of sintering time on the microstructure,grain size,density,Vickers hardness,room-tensile property,and electrical conductivity of the W–Cu refractory alloy was systematically *** results showed that during the short sintering time(30–90 min),the density,Vickers hardness,tensile strength,and electrical conductivity of the W–Cu refractory alloy increased signifi cantly to 98.7%,163.29 HV 30,507.3 MPa,and 14.2%International Annealed Copper Standard with the sintering time increasing,respectively,while its grain size showed no obvious *** the sintering time further increased to 120 min,the density was basically consistent with the sintering time of 90 ***,the prolonged high temperature sintering resulted in the grain growth of the samples,which caused the deterioration of the Vickers hardness,room-tensile strength,and conductivity properties of the W–Cu refractory *** the same sintering time,the density,Vickers hardness,and electrical conductivity of the HOP sintered W–Cu refractory alloy were signifi cantly higher than those of the HP sintered *** was indicated that high density,fi ne-grain,and excellent properties W–Cu refractory alloys could be prepared by hot oscillatory pressing under appropriate sintering time.

关键词： W–Cu refractory alloy Hot oscillatory pressing sintering time Microstructure Property

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sintering time Influences on Microstructure and Electrical Properties of Scandium Doped Zinc Oxide Varistor Ceramics

Sintering Time Influences on Microstructure and Electrical P...

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中国材料大会2012

作者： Chenghua Zhang Bin Jiang Ke Zhang Lei Jiao Renhong Yu Dong Xu School of Material Science and Engineering Jiangsu University State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiao tong University Changzhou Engineering Research Institute of Jiangsu University

ISBN: (纸本)9783037856079

Sc2O3-doped zinc oxide varistor ceramics were prepared by a solid reaction route. The microstructure and the electrical properties was analyzed by scanning electron microscope and X-ray diffraction. sintering time influences on the microstructure and the electrical properties of Sc2O3-doped zinc oxide varistor ceramics are studied. The results show that the electrical properties of Sc2O3-doped zinc oxide varistor ceramics sintered at 1000 ℃ and sintered for 1 h was better: the voltage gradient was 653 V/mm;the leakage current was 0.18 μA and the nonlinear coefficient was 57.1.

关键词： Varistor ceramics Zinc oxide sintering time Dielectric properties Microstructure

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sintering time influences on microstructure and electrical properties of scandium doped zinc oxide varistor ceramics

Sintering time influences on microstructure and electrical p...

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2011年全国压电和声波理论及器件应用研讨会

作者： Dong XU~(1,2,3,*)Bin JIANG~1 Yan ZHAO~1 1 School of Material Science and Engineering,Jiangsu University,Zhenjiang 212013 2 State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University, Xi’an 710049 3 State Key Laboratory of New Ceramic and Fine Processing,Tsinghua University,Beijing 100083

ScO-doped zinc oxide varistor ceramics were prepared by using a solid reaction route,microstructure and electrical properties was analyzed by scanning electron microscope and X-ray *** time influences the microstructu... 详细信息

关键词： Varistors Zinc oxide sintering time Electric properties Microstructure

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Influence of size of seed grains and sintering condition on varistor properties of ZnO-Bi_2O_3-TiO_2-Sb_2O_3 ceramics

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中国有色金属学会会刊：英文版 2001年第3期11卷 328-332页

作者：徐庆陈文袁润章 Wuhan Univ Technol State Key Lab Adv Technol Mat Synth & Proc Wuhan 430070 Peoples R China Wuhan Univ Technol Inst Mat Sci & Engn Wuhan 430070 Peoples R China

Varistor ceramics of ZnO Bi 2O 3 TiO 2 Sb 2O 3 system have been fabricated by introducing pre fabricated ZnO seed grains with different size distributions respectively. The results show that the varistor properties were significantly influenced by the size of introduced seed grains, and introducing larger seed grains is more advantageous to the modification of microstructure and the improvement of varistor properties. The varistor properties were considerably improved with a moderately increased sintering temperature or time, whereas degraded apparently when the sintering temperature or time was excessively increased. Compared with the sintering time, the sintering temperature plays a more critical role in determining the varistor properties. By introducing pre fabricated ZnO seed grains into the original powders, low voltage ZnO varistor ceramics possessing the desired electrical properties have been produced with a sintering temperature of about 1 210 ℃ and a sintering temperature of 2～2.5 h. [

关键词： ZnO Bi 2O 3 TiO 2 Sb 2O 3 ceramics seed grains sintering temperature sintering time low varistor voltage

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Effect of sintering Conditions on Structure of Manganese Zinc Ferrite Powders

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Chinese Journal of Aeronautics 2006年第B12期19卷 179-182页

作者： DONG Li-min HAN Zhi-dong WU Ze ZHANG Xian-you College of Materials Science and Engineering Harbin University of Science and Technology Harbin 150040 China

The structures of the Mn-Zn ferrites synthesized under different sintering conditions by the sol-gel method were investigated by the X-ray diffraction （XRD） and the scanning electron microscopy （SEM） with focus on two factors： the pre-sintering treatment and the calcining time. The results show that the sintering conditions have significant effects on the structures and the particle size of the Mn-Zn ferrites. Compared with the products without pre-sintering, those pre-sintered at 500℃ have a single phase and no diffraction peaks of Fe2O3 that could be found. The effects of the pre-sintering temperature on the structures of the ferrites were also studied. As a result, 500℃ proves to be the favorite in the pre-sintering treatment. The XRD patterns of the ferrites calcined at 1 200℃ for 6 h will present diffraction peaks of pure crystallization of spinel phase while those for 2 h or 4 h will show peaks of Fe2O3. The SEM also bears witness to well-grown grains of pure Mn-Zn ferrites if calcined for 6 hours.

关键词： manganese zinc ferrite spinel sol-gel sintering time

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