Influence of co-precipitation reaction parameters and dispersant on performance of Cu-Al2O3 powders
SHI Yong-liang1，LIN Tao2，QI Cui-fen1，CHEN Tao1，ZHANG Jing-jin1
1. Department of Materials Engineering， Hebei College of Industry and Technology， Shijiazhuang 050091， China 2. Advanced Material & Technology Institute， University of Science and Technology Beijing， Beijing 100083， China
Abstract：The nano-Al2O3-dispersed strengthening copper-based powder was prepared with acidic and alkaline waste cupric liquor as raw material， polyvinyl alcohol (PVA) as dispersant， adding soluble aluminum salt to co-precipitation， calcination and hydrogen reduction. The effects of co-precipitation process parameters on the particle size of Cu-Al2O3 powder and dispersed phase Al2O3 were checked by laser particle size analyzer， SEM-EDS and X-ray diffraction. Results show that， the Cu-Al2O3 powder with particle size of less than 1.5 μm and narrow size distribution is prepared by controlling co-precipitation reaction parameters as follows， mother liquor concentration of 1.0 mol/L， precipitation ammonia concentration of 20% (volume fraction)， reaction temperature of 70 ℃ and pH value of 7. The particle size and distribution of dispersed phase is controlled by the content of dispersant. The nano-Al2O3-dispersed phase is less than 100 nm particle size and 100-200 nm particle spacing when the content ratio of PVA and copper ion is 0.4[∶]1.0. After sintered at 950 ℃ in hydrogen for 60 min， the sintered body has density of 8.45 g/cm3 and hardness of 115 HB.
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2017, Vol. 27 
