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采用浆料包渗法,以Cr2O3粉为渗Cr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随后浆料包渗Cr、Al,制备Cr-Al共渗层。研究了稀土氧化物CeO2对Cr-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Cr、Al的固溶体为主转变为Ni3Al金属间化合物和固溶体两相混合;与不加稀土氧化物相比,改性后渗层氧化增重由纯铜的1/6降低到1/11,氧化产物为Cr2O3、Al2O3和少量的NiO,氧化层致密,没有明显的裂纹和空洞出现,改善了铜表面抗高温氧化性能。
Slurry infiltration method was used. Cr2O3 powder infiltrated Cr source, pure Al powder as reductant, NH4Cl as activator, Al2O3 as inert additive, protein (egg white) as binder, pre-plated Ni on Cu surface Permeate Cr, Al, prepared Cr-Al co-diffusion layer. The effect of rare earth oxide CeO2 on microstructure and oxidation properties of Cr-Al layer was studied. The results show that after the CeO2 oxide is added into the infiltrant, the microstructure of the infiltrated layer is mainly composed of the solid solution of Cr and Al, and the intermetallic compound of Ni3Al and the solid solution are mixed. With the addition of rare earth oxides, The weight gain is reduced from 1/6 of pure copper to 1/11. The oxidation products are Cr2O3, Al2O3 and a small amount of NiO. The oxide layer is dense with no obvious cracks and voids, improving the high temperature oxidation resistance of the copper surface.