( 合肥工业大学 材料科学与工程学院，合肥 230009)
摘 要: 采用湿化学工艺——蒸氨均相沉淀法， 制备了纳米CuWO4·2H2O/Cu2WO4(OH)2均相沉淀物， 然后煅烧、 还原， 得到含Cu 30%的W-Cu复合粉。 将该复合粉压坯在H2气氛中于不同温度下烧结后， 对烧结体的微结构和物理、 力学性能等进行了测试分析。 实验结果表明： 蒸氨均相沉淀法制备的W-Cu复合粉体具有纳米粒度和均匀的化学组成， 其烧结活性高， 在较低温度下烧结即可达很高的致密化程度。 由上述W-Cu粉体所制备的烧结体具有良好的物理、 力学性能。
关键字: 均相沉淀； W-Cu复合粉； 纳米颗粒； 烧结行为
homogeneous precipitation process and its sintering behavior
（School of Materials Science and Engineering,
Hefei University of Technology, Hefei 230009, China）
Abstract: A novel process, namely homogeneous precipitation by evaporating ammonia, was employed to prepare W-Cu powder. CuWO4·2H2O/Cu2WO4(OH)2 precipitates were first obtained by adding aqua ammonia into a liquor solution containing natrium tungstate and copper chloride, then the solution was heated to remove ammonia. The precipitate was then washed, dried and dehydrated, followed by reducing in H2, to convert into W-Cu powder. Properties of both the final W-Cu powder and its sintered parts were characterized. The W-Cu powder produced by the homogeneous precipitation process has a nearly spherical shape, with particle size ranging from 50 nm to 200 nm and a uniform distribution of W and Cu ingredients. Relative density of more than 94% and 98% was obtained for W-Cu parts sintered at 1 050 °C and 1 150 °C, respectively. Homogeneous microstructure, good physical and mechanical properties were also achieved for the sintered W-Cu parts.
Key words: homogeneous precipitation; W-Cu powder; nanoparticle; sintering behavior
