Posted by Gordon England (62.252.0.12) on 13:42:08 28/02/05
In Reply to:Iron coating surface roughness posted by R. Pittier
: Hi,
:
: this seems to be a very helpful forum and I'd like to start a discussion on the following topics:
:
: - how to diminish surface roughness when plasma-spraying iron powder?
: - how to measure an iron coating on an aluminium substrate?
:
: I've been looking for an answer to the latter for a while... Eddy currents and ultrasonic measurements obviously don't work well because of the surface roughness (substrate thickness = 6-8 mm, coating thickness = 0.2-1 mm, roughness = 50-100 um), but I'm sure there IS a solution... I can't be the only one having this problem...
: I've been starting testings for the first question by varying the iron powder particle size and I'm waiting for the results. Is it the right parameter to work with?
:
: Thanks
:
: RP
Powder particle size will have probablly the largest effect on coating texture. The grit blast roughness can also be a factor on thin coatings.
Plasma spraying parameters can also effect texture, usually higher velocity produces finer texture.
Instruments based on eddy current are usually use for this type of coating/substrate combination. Magnetic type instruments if calibrated may be possible, although they are normally used for the reverse coating/substate combination.
Regards Gordon
Follow Ups:
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