Re: HVOF spray Ti6Al4V

Posted by Gordon England ( on 18:33:06 04/04/06

In Reply to: HVOF spray Ti6Al4V posted by Greg Gibbons

Hi Greg
Depends really on nature of the coating you want. I have experience of arc and plasma spraying this alloy, but not HVOF as yet. Gases like oxygen, nitrogen and hydrogen do have a significant effect on coating properties. In arc and plasma spraying only argon and or helium gases are used to produce ductile low contamination coatings. Standard spray methods tend to produce coatings with very good bonding properties, but are hard and somewhat brittle in nature due to gas absorption and oxidation.
HVOF should produce good dense coatings, but some oxidation and gas absorption will be difficult to avoid. Argon would probably be a good alternative to nitrogen as a powder feed carrier gas. If using the Metco Diamond jet process you could consider using pure nitrogen instead of air for running the air cap.
Cold gas-dynamic spray or cold spray technology would be advantages here.
Regards Gordon

Follow Ups:
Surface Engineering Forum

Surface Engineering Message Board Archive

Surface Engineering Message Board Archive Index

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


Site Links


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


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