Gordon England Surface Engineering Forum



Re: coating homoginization

Posted by Hong Wei Wang (193.116.28.254) on 17:23:02 13/12/05

In Reply to: Re: coating homoginization posted by Gordon England

MCrAlY is highly enriched with Cr and Al compared with typical Ni- or Co-base superalloys. A drawback is the metallurgical instability of these coatings in service condition such that there would be service high temperature driven inwards diffusion of these elements and outwards diffusion of base-alloy elements to create a brittle interdiffuison zone (due to sigma, mu phases formation). Post coating HT (1050 oC) for stabilisation is a general requirement for LPPS MCrAlY. other reasons of PCHT is to reduce the brittleness and close loose porosity (sintering) of the as-sprayed coating by plasma spray.
As for the absence of need to HT HVOF MCrAlY, are you sure this is true (certainly for the hi-temperature applications)?
Regards,
Dr. Hong Wei Wang
ERA Technology Ltd


Follow Ups:
Surface Engineering Forum

Surface Engineering Message Board Archive

Surface Engineering Message Board Archive Index

Search Message Boards Archives

www.gordonengland.co.uk





GoogleCustom Search

Post A Message!

Gordon England Surface Engineering ForumPlease go to the new Surface Engineering Forum as this old message board is a read only archive. Please copy and paste relevant information or link to the page if you wish to reactivate a thread on the new forum.







Gordon England Independent Thermal Spray Coating Consultant
Telephone: +44 (0)1252 405186

PLEASE CLICK HERE TO EMAIL

Site Links

Introducing

Nature of Thermal Spray Coatings

Surface Engineering in a Nutshell

Surface Engineering Forum

Thermal Spray Gun Repair Service

Plasma Consumable Parts

Thermal Spray Powder Supplies

Applications:

Thermal Spray Coatings on Carbon and Glass Fibre Reinforced Polymers

HVOF Coating of Paper Making Roll

Abradable Coatings

Photomicrographs

Thermal Spray Processes:

Combustion Wire Thermal Spray Process

Combustion Powder Thermal Spray Process

Arc Wire Thermal Spray Process

Plasma Thermal Spray Process

HVOF Thermal Spray Process

Detonation Thermal Spray Process

Plasma Flame Theory

Cold Spray Coating Process



Wear and Use of Thermal Spray Coatings

Corrosion and Use of Thermal Spray Coatings

Glossary of Thermal Spray and Surface Engineering Terms

Image Directory for Thermal Spray Coatings

Plasma Gas Flow Information

Plasma Gas Flow Correction Calculator

Contact Form

Links to other interesting sites related to thermal spray and surface engineering

Reciprocal Links

Periodic Table of the Elements

SI Units

Calculators for Conversion between Units of Measurement

Hardness Testing

Surface Engineering Message Board Archive

Surface Engineering Message Board Archive Index

Search This Site


Photography Gallery2

Photography Gallery3


© Copyright Gordon England