Oxidation-resistant Ge-doped silicide coating on Cr-Cr2Nb alloys by pack cementation

被引：24

作者：

He, YR ^{[1
]}

Rapp, RA ^{[1
]}

Tortorelli, PF ^{[1
]}

机构：

[1] OAK RIDGE NATL LAB,OAK RIDGE,TN 37831

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1997年 / 222卷 / 02期

关键词：

alloys; diffusion coating; morphology; oxidation;

D O I：

10.1016/S0921-5093(96)10516-5

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The halide-activated pack cementation process was modified to produce a Ge-doped silicide diffusion coating on Cr-Cr2Nb alloys in a single processing step. The morphology and composition of the coating depended both on the pack composition and processing schedule and also on the composition and microstructure of the substrate. Higher Ge content in the pack suppressed the formation of CrSi2 and reduced the growth kinetics of the coating. Ge was not homogeneously distributed in the coatings. Under cyclic and isothermal oxidation conditions, the Ge-doped silicide coating protected the Cr-Nb alloys from significant oxidation and from pesting by the formation of a Ge-doped silica film.

引用

页码：109 / 117

页数：9

共 32 条

[1]

[Anonymous], 1983, SMITHELLS METALS REF

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