摘要
采用浆料包渗法,以SiO2粉为渗Si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Si制备渗层。研究CeO2氧化物对渗Si层组织和氧化性能影响。结果表明:渗剂中添加CeO2氧化物后,渗层组织由以Ni31Si12+Ni2Si金属间化合物为主转变为以Ni2Si为主与NiSi混合的金属间化合物;渗Si层氧化增质由纯铜的1/4降低到纯铜的1/14,氧化产物为SiO2、Al2O3和少量的NiO,氧化层较致密而且颗粒细小,没有明显的裂纹和空洞出现,改善了抗高温氧化性能。
Using slurry pack cementation mixture with SiO2 as siliconizing source, pure Al powder as reducer, NH4Cl as activator, Al2O3 as inert additive and albumen （egg white） as cohesive agent, the electroplated specimens with a layer of electroplating nickel originally deposited on copper were siliconized to prepare coating. The effects of CeO 2 oxides on the microstructures and high temperature oxidation resistance of coating were studied. The results show that the phases of the coating are transformed from Ni 31 Si 12＋Ni 2 Si to Ni 2 Si＋NiSi intermetallics after adding CeO 2 oxides. The oxidation mass gain of Si-Al coating is decreased from 1/4 to 1/14 of that of pure copper. The oxide is primarily composed of SiO 2 , Al 2 O 3 and a small amount of NiO. The oxide layer with smaller grain size is dense without cracks and pores, which improves the high temperature oxidation resistance.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2013年第11期3184-3188,共5页
The Chinese Journal of Nonferrous Metals
基金
南京工程学院博士启动基金资助项目(YKJ201203)
