喷雾干燥W-Cu前驱体粉末煅烧和还原中的物相变化特征

Phase transformation during calcining and reducing of spray-dried W-Cu precursor powder

采用溶胶-喷雾干燥-氢气还原技术制备W-Cu复合粉末;采用X射线衍射分析技术(XRD)对喷雾干燥前驱体粉末在煅烧和还原过程中的物相特征进行了分析。研究表明:喷雾干燥W-Cu前驱体粉末煅烧后相组成转变为WO3和CuWO4;煅烧后氧化物粉末在还原过程中的相演变为低温下CuO相被还原、中温下WO3相还原成一系列钨的氧化物(WO2.90和WO2)以及高温下WO2相还原成W。

W-Cu composite powder was prepared by sol-spray drying-hydrogen reduction process. The phase during calcining and reducing of spray-dried W-Cu precursor powder was characterized by XRD. The result shows that spraydried W-Cu precursor powder changes into WO3 and CuWO4 after calcining. CuO phase is reduced during low- temperature reducing of the oxide composite powder, WO3 is reduced to W02.90 and WO2 during middle-temperature reducing, WO2 is reduced to W during high-temperature reducing.