Properties of tungsten heavy alloys, prepared by spark-plasma sintering

10th International School-Conference on Materials for Extreme Environment: Development, Production and Application

Ermakova, N.S.^1 ; Yurlova, M.S.^1 ; Grigoryev, E.G.^1

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe highway, 31, Moscow

115409, Russia^1

关键词: Microstructure and mechanical properties;    Sintering temperatures;    Solid phase sintering;    Spark plasma sintering techniques;    Starting powders;    Strength characteristics;    Theoretical density;    Tungsten heavy alloys;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/130/1/012050/pdf
DOI  :  10.1088/1757-899X/130/1/012050

来源: IOP

【 摘 要 】

In this paper the effect of spark-plasma sintering parameters on the microstructure and mechanical properties of tungsten heavy alloys VNZHK-90 and VNZHK-93 are studied. The basic dependences of the density and strength characteristics from the sintering temperature and velocity are shown. Conclusions about the dependence of the method of preparation of the starting powders on the microstructure of alloys are formulated. It was found that by spark-plasma sintering technique it is possible to achieve the theoretical density of compact heavy alloys during solid-phase sintering. It is shown that the maximum level of alloys mechanical properties is observed when sintering temperature 1300 ° C. It is found that the change in the rate of heating does not contribute to change in the density of the samples. At the same time, on the mechanical properties the shrinkage rate has a significant effect.