摘要
采用紫钨氢还原制备纳米钨粉体并对其进行热处理,通过样品的形貌、物相、含量、比表面和孔结构的表征,分析晶格的变化和晶粒的长大机理.结果表明,经热处理后的纳米钨粉体更致密,形状更规则,晶格由收缩变膨胀;比表面积和孔径减小,粒径增大且分布更均匀.随着热处理温度升高,晶格膨胀趋于稳定;当热处理温度达到1 200℃时,晶粒长大迅速,其长大机理可根据晶界迁移进行解释.
Nano-W powder was prepared from voilet tungsten oxides by hydrogen reduction,and through heat treatment on the samples.Then,we have characterized the sample morphology,phase,content,specific surface area and pore structure,analyzed the lattice change and the growth mechanism of the grain.The results indicate that the nano-W powder is more compact after heated treatment,the shape is more regular and the lattice is changed into expansion from contraction;its specific surface area and pore size decreases,and particle size increases and more uniform particle size distribution.With the temperature increases,the lattice expansion intends to stability.The grain growth is very rapidly when the temperature reaches 1 200 ℃,and its growth mechanism is explained according to the grain boundary migration.
出处
《华侨大学学报（自然科学版）》
CAS
北大核心
2010年第6期620-625,共6页
Journal of Huaqiao University(Natural Science)
基金
国家科技支撑计划项目(2007BAE05B01)
关键词
纳米钨粉体
热处理
微结构
晶格畸变
晶粒长大
nano-tungsten powder
heat treatment
microstructure
lattice distortion
grain growth
