Re: H2 instead of He for Al2O3 spraying

Posted by Juergen ( on 12:54:43 08/09/05

In Reply to:H2 instead of He for Al2O3 spraying posted by Régis Pittier

: Hi,
: This is a quite simple question, I guess, but I'm pretty new to surface coating...
: I'm currently working with a Triplex plasma spray to coat Al plates with Al2O3/TiO2 ceramics. I'm using Ar as primary gaz and He as secondary. I'd really like to get rid of He, and I've thought about using H2 instead. I know this is a vast topic, so I would appreciate you mention some readings or webs site I should look at in order to understand how to do it and what kind of results I should expect.
: Please let me know of any similar experience you've been through.


Tis is Juergen again,

as I wrote yesterday we´re working with the triplex plasma gun.

I got in touch with a developer of this gun. He told me, that H2 or N2 or othe molecular gases would destroy the anode of the Triplex gun because the current densitiy will become too high locally at the 3 contact zones of the anode, resulting in melting it.
So, please use only He as secondary gas.



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