Microwave sintering of Mo nanopowder and its densification behavior

作     者：Bo-hua DUAN Zhao ZHANG De-zhi WANG Tao ZHOU 段柏华;张钊;王德志;周涛

作者机构：School of Materials Science and Engineering Central South University Changsha 410083 China Key Laboratory of Nonferrous Metal Materials Science and Engineering Ministry of Education Central South University Changsha 410083 China 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2019年第29卷第8期

页      面：1705-1713页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Project(2017YFB0305601) supported by the National Key R&D Program of China Projects(51874368,51274246) supported by the National Natural Science Foundation of China 

主　　题：molybdenum microwave sintering nanopowder densification kinetics diffusion mechanism 

摘      要：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 *** this experiment,Mo nanopowder and micropowder were used for conventional sintering and microwave sintering at different sintering temperatures and sintering time,*** 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 *** relative density rapidly reached 95%,followed by a small *** nanopowder with a relative density of 98.03% and average grain size of 3.6 μm was prepared by microwave sintering at 1873 K for30 *** to the analysis of the sintering kinetics,its densification is attributed to the combination of volumetric diffusion and grain boundary diffusion *** 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 *** results confirm that the microwave sintering is a promising method to economically prepare molybdenum with high properties.