Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第11期    总第176期    2013年11月

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文章编号:1004-0609(2013)11-3184-05
CeO2对渗Si层组织和高温氧化性能的影响
王红星,柳秉毅,杨少锋,张 炎

(南京工程学院 材料工程学院,南京 211167)

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。

 

关键字: CeO2;渗Si层;氧化性能;Ni-Si金属间化合物

Effects of CeO2 addition on microstructure and high temperature oxidation resistance of siliconized coating
WANG Hong-xing, LIU Bing-yi, YANG Shao-feng, ZHANG Yan

School of Materials Engineering, Nanjing Institute of Technology, Nanjing 211167, China

Abstract: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 CeO2 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 Ni31Si12+Ni2Si to Ni2Si+NiSi intermetallics after adding CeO2 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 SiO2, Al2O3 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.

 

Key words: CeO2; siliconized coating; oxidation resistance; Ni-Si intermetallic compound

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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