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

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第1期    总第106期    2008年1月

[PDF全文下载]        

    

文章编号:1004-0609(2008)01-0007-06
铌基超高温合金表面Si-Al包埋共渗抗氧化涂层的组织形成
田晓东,郭喜平

(西北工业大学 凝固技术国家重点实验室,西安 710072)

摘 要: 通过1 000~1 150 ℃ Si-Al包埋共渗8 h的方法在铌基超高温合金表面制备Al改性硅化物抗氧化涂层,结果表明:实验温度下制备的涂层均具有多层复合结构;不同温度下共渗涂层外层的相组成不同,但最内层均由(Nb, Ti)Al3(Cr, Al)2(Nb, Ti)组成。1 050 ℃8 h Si-Al共渗在合金表面形成了Al改性的硅化物涂层,其最外层主要为Nb3Si5Al2,依次往内为(Nb, X)(Si, Al)2(X代表Ti, CrHf元素)层、(Nb, X)5Si3层以及最内层;而在1 000 ℃8 h条件下Si-Al共渗形成的涂层以(Nb, Ti)Al3为主,其中含有少量的(Nb, X)5Si3,没有形成以硅化物为主的涂层;在1 100 ℃8 h1 150 ℃8 h条件下Si-Al共渗形成的涂层外层以(Nb, X)(Si, Al)2为主,但其中Al含量(摩尔分数)仅为2.35%,没有形成Nb-Si-Al三元化合物层。

 

关键字: 铌基超高温合金;包埋渗;Al改性硅化物涂层

Structure formation of co-deposition of Si and Al coatings on advanced Nb-based ultrahigh temperature alloy by pack cementation process
TIAN Xiao-dong, GUO Xi-ping

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China

Abstract:Al-modified silicide coatings on an advanced Nb-based ultrahigh temperature alloy were prepared by co-depositing Si and Al at 1 000, 1 050, 1 100 and 1 150 ℃ for 8 h, respectively. The results show that the coatings obtained by these processes have a multiple layer structure. The outer layers of the coatings have the different phase constituents at different coating temperature, but all the innermost layers of the coatings are constitutive of (Nb, Ti)Al3 and (Cr, Al)2(Nb, Ti). Al-modified (Nb, X)Si2(X represents Ti, Cr and Hf) coatings with an Nb3Si5Al2 outermost layer are obtained by co-depositing Si and Al at 1 050 ℃ for 8 h. The coatings prepared at 1 000 ℃ for 8 h are mainly constitutive of (Nb, Ti)Al3, and the coatings prepared at 1 100 ℃ for 8 h and 1 150 ℃ for 8 h are mainly constitutive of (Nb, X)- (Si, Al)2 with 2.35%Al (mole fraction).

 

Key words: Nb-based ultrahigh temperature alloy; pack cementation; Al-modified silicide coating

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

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

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com