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采用辉光等离子冶金技术在纯钛表面制备了Ti-Pd合金层,用XRD、SEM和EDS研究合金层的相组成、微观组织和元素分布。结果表明:900℃渗钯时,Ti-Pd合金层大体分为3层,各层间Pd元素的浓度有明显的突变,Pd在Ti中的扩散属于反应扩散。室温状态时,合金层从表层到基体分别是:Ti Pd3相层,α-Ti Pd相层,Ti2Pd相层。推测合金层在高温状态时,从表层到基体分别是:Ti Pd3相层,β-Ti Pd相层,Pd在β-Ti中的饱和固溶体层。各层的长大速率基本满足抛物线规律,Pd在Ti中的扩散以体扩散为主。
Ti-Pd alloy layer was prepared on the surface of pure titanium by glow plasma metallurgical technique. The phase composition, microstructure and elemental distribution of the alloy layer were investigated by XRD, SEM and EDS. The results show that the Ti-Pd alloy layer is roughly divided into three layers when the palladium is infiltrated at 900 ° C, and the concentration of Pd element in each layer has obvious mutation. The diffusion of Pd in Ti belongs to reaction diffusion. Room temperature state, the alloy layer from the surface to the substrate are: Ti Pd3 phase layer, α-Ti Pd phase layer, Ti2Pd phase layer. Speculated that the alloy layer at high temperature, from the surface to the substrate are: Ti Pd3 phase layer, β-Ti Pd phase layer, Pd in β-Ti saturated solid solution layer. The growth rate of each layer basically meets the parabolic law, and the diffusion of Pd in Ti takes the form of bulk diffusion.