Influence of technology of nanopowder production on the microstructure of the sintered by spark-plasma material on the example of aluminum oxide

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

Zholnin, A.G.^1 ; Melekhov, A.P.^1 ; Hafizov, R.S.^1 ; Vakulenko, S.A.^1 ; Rubinkovskiy, N.A.^1 ; Samokhin, A.V.^2 ; Alekseev, N.V.^2 ; Grigoryev, E.G.^1

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

115409, Russia^1

Federal State Institution of Science, Institute of Metallurgy and Materials Science, Leninsky Avenue 49, Moscow

119991, Russia^2

关键词: Comparative studies;    Impurities in;    Microstructure and properties;    Nano powders;    Nanopowder productions;    Plasma synthesis;    Properties and microstructures;    Spark plasma;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/130/1/012043/pdf
DOI  :  10.1088/1757-899X/130/1/012043

来源: IOP

【 摘 要 】

A comparative study of the results of spark-plasma sintering (SPS) of two-types of aluminum oxide nanopowders, obtained by the method of conductor explosion and plasma synthesis. When the parameters of both powders are similar (spherical form of the particles, size, phase composition) as well as SPS modes the properties of the resulting compacts are significantly different both in mechanical properties and microstructure. The reason of differences in the properties of the obtained compacts is in technological impurities in powders, obtained by different methods. Artificial addition of impurities, contained in the nanopowder, obtained by electro explosion of conductor, into the powder, made by synthesis in plasma and not containing these impurities, allowed to reveal their effect on the formation of the microstructure and properties of the sintered by SPS method sample.