Preparation and oxidation resistance of silicide/aluminide composite coatings on an Nb-Ti-Si based alloy

被引：11
|
作者：
Zhang, Ping [1 ]
Guo, Xiping [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
来源：
SURFACE & COATINGS TECHNOLOGY | 2015年 / 274卷
基金：
中国国家自然科学基金;
关键词：
Nb-Ti-Si based alloy; Silicide/aluminide composite coating; Two-step pack cementation; Microstructure; Oxidation resistance; MODIFIED SILICIDE COATINGS; ULTRAHIGH-TEMPERATURE ALLOY; PHASE-DIAGRAM; AL; CR; MICROSTRUCTURE; DEPOSITION; MORPHOLOGY; HF;
D O I：
10.1016/j.surfcoat.2015.04.016
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Silicide/aluminide composite coatings were prepared on an Nb-Ti-Si based alloy by a two-step pack cementation process including siliconizing firstly and then aluminizing. The siliconized coating is composed of a thick (Nb,X) Si-2 outer layer and a thin (Ti,Nb)(5)Si-4 inneriayer. During the aluminizing process, the original (Nb,X) Si-2 outer layer retains and Al moves through it to form an Al-3(Nb,X) layer beneath it. Besides, a thin Al-3(Nb,X) outermost layer also forms above the (Nb,X)Si-2 layer. This composite coating possesses good oxidation resistance at 1250 degrees C within 50 h, and a double-layered scale with an Al2O3 outer layer and a SiO2-matrix inner layer forms. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：18 / 25
页数：8
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