Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 29    No. 8    August 2019

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Microwave sintering of Mo nanopowder and its densification behavior
Bo-hua DUAN1,2, Zhao ZHANG1, De-zhi WANG1,2, Tao ZHOU1

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China

Abstract:In order to prepare high-performance Mo with fine and homogeneous microstructure to meet the demand of high-technology applications such as metallurgical, mechanical, national defense, aerospace and electronics applications, the microwave sintering process and densification mechanism of Mo nanopowder were studied. In this experiment, Mo nanopowder and micropowder were used for conventional sintering and microwave sintering at different sintering temperatures and sintering time, respectively. The results showed that with the increase in the sintering temperature, the increase rates of the relative density and hardness increased rapidly at first and then slowed down. The relative density rapidly reached 95%, followed by a small change. Mo nanopowder with a relative density of 98.03% and average grain size of 3.6 μm was prepared by microwave sintering at 1873 K for 30 min. According to the analysis of the sintering kinetics, its densification is attributed to the combination of volumetric diffusion and grain boundary diffusion mechanisms. The calculated sintering activation energy of Mo nanopowder was 203.65 kJ/mol, which was considerably lower than that in the conventional sintering, suggesting that the microwave sintering was beneficial to the enhancement in the atom diffusion and densification for the powder. The results confirm that the microwave sintering is a promising method to economically prepare molybdenum with high properties.

 

Key words: molybdenum; microwave sintering; nanopowder; densification kinetics; diffusion mechanism

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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