纳米W-Cu粉末的热机械化学法制备及其烧结性能研究

Preparation and Characterization of W-Cu Nano-powder by the Thermo-Mechano-Chemical Process

通过均相沉淀获得Cu2WO4(OH)2/CuWO4·2H2O共沉淀物,并对煅烧该沉淀物所得的W、Cu氧化物进行球磨,然后H2还原,得到了含Cu量为30%的W-Cu复合粉末。对该复合粉末的性能进行了表征,并对其烧结体的密度、微结构和力学性能等进行了测试分析。结果表明,热机械化学法制备的W-Cu复合粉末粒度为纳米级,烧结活性高,其压坯在H2气氛中固相烧结可达到96%的相对密度,液相烧结则可达到高于99%的相对密度,烧结体具有细小均匀的微结构和良好的力学性能。

A new thermo-mechano-chemical process was designed to produce W-Cu composite powder with high sinterability.The powder was characterized by X-ray diffraction(XRD) and transmission electron microscope (TEM).Subsequently,density,microstructure and mechanical property of the sintered W-Cu parts were measured.It has been show that W-Cu powder produced by the thermo-mechano-chemical process has a nanometer particle size ranging from 20 to 50nm,with a dispersed distribution of W and Cu in the powder.Relative density of more than 96% and 99% of the theoretical value can be obtained when the W-Cu green compacts were sintered in H_2 at temperature of 1050 and 1150℃,respectively.W-Cu composites prepared from the W-Cu nanocomposite powder show good mechanical properties and have very fine grain size and homogenous distribution of W and Cu in the microstructure.