×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

how to remove SiO2 layer from Si3N4 powders

how to remove SiO2 layer from Si3N4 powders

how to remove SiO2 layer from Si3N4 powders

(OP)
Hi,

I want to remove SiO2 layer which occurs naturally on the Si3N4 powders. But I do not want to use HF because it is not safe. Is it possible to remove SiO2 by using any other acids/bases?
Any information is appreciated. Thanks for all.

RE: how to remove SiO2 layer from Si3N4 powders

Sometime back we needed to remove a SiO2 layer form a metal. This was accomplished by an outfit in (Michigan) that used anhydrous HF a a relatively high temperature.

Work was then done using an electrolytic process and as I recall it used a Ca Salt. They were able to remove the SiO2 with very little damage to the substrate. I don't know how your substrate will stand up. I wasn't directly involved as this project was at the PHD level

Can you use something like a SS White abrasive blast system to clean your SiN4?

RE: how to remove SiO2 layer from Si3N4 powders

These are the people (Ti Coating) who accomplished the HF ion cleaning for us. It may not work as the process removes some nitride coatings. I think it's worth a phone call for information if nothing better than to eliminate this route.

http://www.ticoating.com/a.html

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources