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本文研究了以SnCl_2代替PdCl_2活化钨粉,以水合联氨作还原剂,用化学镀方法制取的Cu、Ni包W复合粉末的物理、工艺性能和合金的特性。实验表明,用化学镀方法制得的W、Ni、Cu复合粉末,Cu、Ni的分散性好,分布均匀,沉积的Ni能保持很好的活性,因而使复合粉末具有良好的压制性能和活化烧结性能。实验还表明,这种复合粉末在1230℃～1300℃的温度下进行液相烧结,合金的抗拉强度都大于784MPa,合金的最高抗拉强度可达940·8MPa。合金的致密度达到理论密度的99.54%。致密度的均匀性达到99.76%。合金在-41℃～+71℃的膨胀系数是6.5×10~(-6)℃~(-1)。弹性模量为303.8×10~3MPa。合金的机加工性能良好。机加工后的光洁度达▽7以上。合金在工程使用上获得了很好的效果。作导航陀螺外轮时,其动平衡最大的失衡总重量为30～40毫克。实验表明,化学镀法制取的复合粉末,可用于研制物理机械性能优越、均匀性好的优质新型高比重合金材料。
In this paper, the physical, technological properties and alloy properties of Cu and Ni-W composite powders prepared by electroless plating were studied by using SnCl 2 instead of PdCl 2 -activated tungsten powder and hydrazine hydrazine as reductant. The experimental results show that the W, Ni, Cu composite powders prepared by electroless plating have good dispersibility and uniform distribution of Cu and Ni, and the deposited Ni can maintain good activity, so that the composite powder has good pressing performance and activation Sintering performance. Experiments also show that this composite powder at 1230 ℃ ~ 1300 ℃ liquid phase sintering, the tensile strength of the alloy is greater than 784MPa, the highest tensile strength of the alloy up to 940 · 8MPa. The density of the alloy reaches 99.54% of the theoretical density. The uniformity of density reached 99.76%. The expansion coefficient of the alloy at -41 ℃ ~ + 71 ℃ is 6.5 × 10 -6 ℃ -1. The elastic modulus is 303.8 × 10 ~ 3MPa. The machinability of the alloy is good. Machined finish of ▽ 7 or more. Alloy used in engineering have been very good results. For navigation gyro outer wheel, the unbalanced maximum weight balance of 30 to 40 mg. Experiments show that the composite powder prepared by electroless plating can be used to develop high quality new high specific gravity alloy material with excellent physical and mechanical properties and good uniformity.