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采用浆料包渗法,以TiO2粉为渗Ti源,纯Al粉为还原剂,NH4Cl作为活化剂,Al2O3为惰性添加剂,蛋白质(鸡蛋清)为粘结剂,在Cu表面预先镀Ni随后表面浆料包渗Ti-Al,制备Ti-Al共渗层。研究CeO2氧化物对Ti-Al渗层的组织和氧化性能影响。结果表明:渗剂中添加CeO2氧化物后,渗层组织由Ni-Ti金属间化合物为主转变为Ni-Al金属间化合物为主,包渗过程由渗Ti为主转变为渗Al为主;Ti-Al渗层氧化增重由纯铜的1/10降低到1/28,氧化产物为TiO2、Al2O3和少量的NiO,氧化层致密,没有明显的裂纹和空洞出现,改善了抗高温氧化性能。
Slurry infiltration method was used, TiO2 powder was infiltrated into Ti source, pure Al powder as reducing agent, NH4Cl as activator, Al2O3 as inert additive, protein (egg white) as binder, pre-Ni plating on Cu surface, Slurry bag infiltration of Ti-Al, Ti-Al co-diffusion layer preparation. The effect of CeO2 oxide on the microstructure and oxidation properties of Ti-Al layer was investigated. The results show that the infiltration layer mainly consists of Ni-Ti intermetallic compound and Ni-Al intermetallic compound, and the infiltration process mainly changes from infiltration Ti to infiltration Al. The oxidation weight gain of Ti-Al diffusion layer is reduced from 1/10 of pure copper to 1/28, and the oxidation products are TiO2, Al2O3 and a small amount of NiO. The oxide layer is dense with no obvious cracks and voids, improving the high temperature oxidation resistance .