×
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

SiC in nitric acid Re:"thread330-

SiC in nitric acid Re:"thread330-

SiC in nitric acid Re:"thread330-

(OP)
In reference to thread "thread330-264284: Silicon carbide in nitric acid.",

Does anyone have experience with CVD-SiC coated, SiC bulk material and nitric acid? The previous thread was closed.

I am in semiconductor and we use SiC cintered wafer boats which have a final step of CVD coating of SiC. The assumption has been that the bulk material is susceptable to nitric acid and thus it was coated with the denser layer. I dip these in acids for cleaning of deposition which they see in the plants. If there is a breach of the outer CVD layer, it is assumed that the nitric then attacks the bulk material, turning it green.

Does anyone know of this?

Thanks,
Kevin

RE: SiC in nitric acid Re:"thread330-

What grade of SiC are the boats?
In many grades there is excess free Si (reaction bonded). These grades are susceptible to lots of things.
Has anyone ever done chemical analysis on the green?
It may not be the SiC reacting.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

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