Process study of Al2O3 dispersion strengthened copper powders prepared with waste cupric liquor
SHI Yong-liang1，LIN Tao2，YANG Xiao-cai1，SHI Yan-lin1，LI Xiu-min1
1.Department of Materials Engineering， Hebei College of Industry and Technology， Shijiazhuang 050091， China 2. Advanced Material and Technology Institute， University of Science and Technology Beijing， Beijing 100083， China
Abstract：Using acidic and alkaline waste cupric liquor as raw material， the copper solution was prepared with the processes of acid and alkali neutralization， filtration and sulfuric acid dissolution. Then， the soluble aluminum salt was added into the copper solution. Finally， the nano-Al2O3-dispersed strengthening copper-based powders with 2% (mass percent) alumina were prepared with the methods of complex chemical co-precipitation， calcination and hydrogen reduction. The Cu2+ content in filtrate was measured by flame atomic absorption spectrometry， and the influences of mixing ratio of acidic and alkaline waste cupric liquor on the Cu2+ extraction efficiency were studied. The particle size， morphology and composition of precursor powder， Al2O3-CuO composite powder， Al2O3-Cu powder and Al2O3 dispersed phase were analyzed through scanning electron microscope and X-ray diffraction. The calcination and hydrogen reduction processes were analyzed with TG-DTA test. The results show that， neutralization reaction is completed fully when acidic and alkaline waste cupric liquor has the volume ratio of 2 to 3， and Cu2+ extraction efficiency is 96.75% (mass percent). Precursor powder with fine particle size and no agglomeration is obtained by the way of rapid?precipitator addition. The optimum calcination and hydrogen reduction temperature is 500 ℃ and 550 ℃， respectively. The dispersion phase distributes uniformly and the particle size is less than 200 nm. The extraction experiments prove that the dispersed phase is nano Al2O3.
2017, Vol. 27 
