自蔓延燃烧合成法制备分层及梯度结构的Ni-Al/金刚石复合材料研究

Study of Layered and Gradient Structural Ni-Al/Diamond Composite Prepared by SHS Method

采用自蔓延燃烧合成法制备了分层及梯度结构的Ni-Al/金刚石复合材料。研究了多层及金刚石粒度梯度结构对Ni-Al/金刚石复合材料其自蔓延反应过程及微观相貌的影响。结果表明:随着分层数的增加,自蔓延反应的燃烧波速度下降;自蔓延反应在金刚石粒度梯度结构的燃烧波速率比其在金刚石分层结构的速率快。微观形貌分析表明,自蔓延反应使得钎料合金Ni-Cr与金刚石生成了强碳化合物Cr_3C_2和Cr_7C_3,增强了金刚石和合金粉末基体的结合力。

The layered and gradient structural Ni-Al/diamond composite has been prepared by SHS method. The influence of the multilayer nature and the diamond particle size gradient structure on the self-propagating reaction process and microscopic appearance of Ni-Al/diamond composite has been studied. Result shows that as the number of layers increases, the combustion wave velocity of the self-propagating reaction decreases; the combustion wave velocity of the self-propagating reaction in the diamond particle gradient structure is higher than that in the diamond layered structure. The microscopic appearance analysis result shows that strong carbon compounds, Cr_3C_2 and Cr_7C_3,were created by solder alloy Ni-Cr and diamond through self-propagating reaction, which strenghens the adhesion of diamond and the alloy powder matrix.