机械热化学法制备纳米W-Cu复合粉末及其烧结性能研究  

Preparation and sinterability of W-Cu nanopowder prepared by mechano-thermochemical method

作　　者：程继贵[1] 弓艳飞[1] 夏永红[1] 宋鹏[1] 蒋阳[1] 吴玉程[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《材料热处理学报》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)

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.

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 

分 类 号：TF123.1[冶金工程—粉末冶金] TG146.4[冶金工程—冶金物理化学]