摘要
WO3和CuO原料粉末经气流粉碎后,在H2气氛中进行共还原,制得了Cu含量为20%（wt%）的纳米W-Cu复合粉末;通过X射线衍射,透射电镜和扫描电镜等方法研究分析所制备W-Cu粉末的烧结行为和烧结体性能。结果表明：气流粉碎可以明显地降低WO3和CuO的粒度;通过对气流粉碎氧化物粉末进行共还原,可获得粒度为50-100nm的W-Cu复合粉末。该粉末烧结活性较高,其成形压坯在1200℃下于H2气氛中烧结后相对密度可达98%以上,且烧结体晶粒细小均匀。其抗弯强度和维氏硬度分别超过1000MPa和300MPa,电导率高于35%IACS。
W-Cu nanopowder was prepared by a novel thermo-mechanical method, in which WO3 and CuO powders were first crushed in a high pressure airflow, then co-reduced in H2 to convert into W-Cu composite powder. The WO3 and CuO powders, as well as the resulting W-Cu powder were characterized by XRD, TEM, SEM and laser particle size analysis, with emphasis on sintering behavior of the W-Cu powder and physical and mechanical property of the sintered W-Cu parts. It is shown that airflow crushing effectively reduces particle size of the starting WO3 and CuO powders. W-Cu powder with nanosize of 50 to 100nm is obtained by coreduction of the airflow crushed WOs-CuO powder mixes in H2 , The W-Cu powder exhibits high sinterability. A relative density of more than 98 % of the theoretical is achieved for W-Cu compact sintered at 1200℃ for 2h. Furthermore, the sintered W-Cu parts show good physical and mechanical properties. Bending strength and Vickers hardness of the sintered W-Cu composite are more than 1000 MPa and 300MPa, respectively, and electrical conductivity of 35.76% IACS is obtained.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2007年第4期11-15,共5页
Transactions of Materials and Heat Treatment
基金
教育部新世纪优秀人才支持计划项目(NCET-04-0561)
合肥工业大学中青年科技创新基金项目(103-037016)
关键词
气流粉碎
共还原
纳米W-Cu复合粉末
烧结行为
物理力学性能
oxide powders
airflow crushing
coreduction
W-Cu nanopowder
sinterability
physical and mechanical properties
