Posted by Alexei Goncharov (195.96.79.2) on 16:01:04 28/04/06
In Reply to: Residual strain stress coating model posted by Alexei Goncharov
Dear Gordon and Colleagues One of obvious result from referred
material is that the coating on external surface of a cylinder can
cramp the substrate so strongly that the cracks of coating likely
occur. If there s no preheating and the substrate is cooled so its
temperature is low and stable the compressing is more powerful than
in some other case. At the same time I think that the thickness of
say WC-Co coating less than 0.3 mm and thickness of alumina
coatings less than 0.5 assures no cracks. If take into account that
the growth of thickness of coating on plane substrate is
accompanied by transformation of plane form of surface to slightly
cylindrical or spherical in dependence the form of the substrate,
it s possible to assume that radial component of stress which
compress the substrate can appear in some regions but not at the
edges. Speaking about the edges here it is worth to notice that
well known decrease of thickness of coating as a measure to avoid
peeling of sprayed material can be also explained in frames of
suggested model.
I will be grateful for any comments and remarks
Best regards
Alexei Goncharov
Please 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.
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
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
HVAF 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
Photography Gallery2
Photography Gallery3
© Copyright Gordon England