A method for evaluating the creep properties of overlay coatings

被引：17

作者：

Taylor, MP

Evans, HE

Ponton, CB

Nicholls, JR

机构：

[1] Univ Birmingham, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England

[2] Cranfield Univ, Sch Ind & Mfg Sci, Cranfield MK43 0AL, Beds, England

来源：

SURFACE & COATINGS TECHNOLOGY | 2000年 / 124卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

creep; overlay coatings;

D O I：

10.1016/S0257-8972(99)00629-5

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A new method is described for the evaluation of the creep properties of as-deposited overlay coatings. The method uses a composite tensile specimen consisting of a core alloy of well-characterised creep properties onto which the overlay coating is deposited. The overall strain/time response of this specimen, tested under constant stress conditions, can then be deconvoluted to obtain the creep characteristics of the coating. The method has the advantage that the coatings are evaluated for the same microstructural conditions as they will be used under, i.e. having the same porosity levels and microstructure. A limited demonstration of the method has been made for an air plasma-sprayed Ni25Cr6AlY coating deposited onto an austenitic steel core and creep tested at 900 degrees C. The creep strength of this coating was surmised to be higher than that of equivalent monolithic samples produced by low pressure plasma spraying. (C) 2000 Elsevier Science S.A. All rights reserved.

引用

页码：13 / 18

页数：6

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