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利用葡萄糖和酒石酸钾钠双还原剂,通过化学还原法制备银包铝镁合金粉。实验过程中,主盐为银氨溶液,通过不同的添加速度加入还原液中,得到了微观形貌不同的复合粉体,对复合粉进行微结构分析,确定了以2~3 mL/min较小的速度添加主盐能够得到包覆效果良好的复合粉体,其电阻率达到了5.13×10~(-6)Ω·m;微结构分析银镀层沉积过程表明还原的银颗粒首先沿合金粉体的晶界处形核沉积,并作为之后反应的催化形核中心,促进银的还原沉积,镀层不断平铺生长最后得到完整均匀的镀银层。
The silver-coated aluminum-magnesium alloy powder was prepared by chemical reduction method using glucose and sodium potassium tartrate double reductant. During the experiment, the main salt is the solution of silver ammonia, adding the reducing agent through different adding speed to get the composite powder with different microstructure. The microstructure of the composite powder was analyzed. The addition of the main salt at a small rate can obtain a composite powder with good coating effect, and the resistivity reaches 5.13 × 10 -6 Ω · m. Microstructure analysis The deposition process of the silver coating shows that the reduced silver particles are firstly dispersed along the alloy powder The nucleation at the grain boundaries of the body, and as a catalyst for the nucleation of the reaction center to promote the reduction of silver deposition, plating tiled growth finally get a complete uniform silver coating.