( 合肥工業(yè)大學 材料科學與工程學院，合肥 230009)
摘 要: 采用濕化學工藝——蒸氨均相沉淀法， 制備了納米CuWO4·2H2O/Cu2WO4(OH)2均相沉淀物， 然后煅燒、 還原， 得到含Cu 30%的W-Cu復合粉。 將該復合粉壓坯在H2氣氛中于不同溫度下燒結(jié)后， 對燒結(jié)體的微結(jié)構(gòu)和物理、 力學性能等進行了測試分析。 實驗結(jié)果表明： 蒸氨均相沉淀法制備的W-Cu復合粉體具有納米粒度和均勻的化學組成， 其燒結(jié)活性高， 在較低溫度下燒結(jié)即可達很高的致密化程度。 由上述W-Cu粉體所制備的燒結(jié)體具有良好的物理、 力學性能。
關鍵字: 均相沉淀； W-Cu復合粉； 納米顆粒； 燒結(jié)行為
homogeneous precipitation process and its sintering behavior
WU Yu-cheng, XIA Yong-hong
（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
