ISSN:0267-0844    

DOI:10.1179/sur.1989.5.3.172

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1989.5.3.174

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1989.5.3.177

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1989.5.3.197

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1989.5.3.200

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1989.5.3.201

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1989.5.3.203

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1989.5.3.204

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

AbstractIn the light of increased manufacturing costs for aerospace components and assemblies, methods of removing worn or damaged turbine blade coatings to allow recoating of the original component are assuming ever greater importance. In this contribution case studies are presented describing the development and refining of procedures for the selective chemical/electrochemical stripping of aluminised and PVD MCrAIY coatings from turbine blades. The disassembly of joints by selective stripping of the braze filler material is also considered.

ISSN:0267-0844    

DOI:10.1179/sur.1989.5.3.208

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

AbstractIndentation hardness testing using loads of 25–1000 gf on a Vickers profile diamond indenter has been used to study the deformation and fracture behaviour of CVD TiC and CVD and PVD TiN coatings on a range of steel substrates. The coatings were prepared by proprietary processes and were 2–5 /lm thick. The variation of hardness with indentation size and depth has been compared with a number of models for the composite hardness behaviour of coated systems. Good fits were found both to a law of mixtures model incorporating indentation size effect behaviour, and to a simple empirical polynomial. In both cases, parameters can be calculated from which the hardness of the coating itself can be assessed for purposes of quality control etc. For the first time, the variation of hardness with temperature for coated systems has been investigated. For the coating/substrate composites studied here, hardness fell rapidly with temperature, and‘displayed marked hysteresis of both hardness andfracture behaviour. This reduction in hardness can be so marked that the composite hardness can decrease to below that of the substrate itself above∼300°C. Also, stress relaxation at elevated temperatures leads to copious cracking of the coating during indentation. The observations are discussed and the implications assessed for the tribological applications of coatings. A simple model relating the hysteresis in hardness with residual stress is also presented.

ISSN:0267-0844    

DOI:10.1179/sur.1989.5.3.213

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor