Searching for fully sintered boron nitride ceramic

  • Thread starter Thread starter gwj0606
  • Start date Start date
AI Thread Summary
Fully sintered boron nitride ceramics are challenging to obtain due to their high sintering temperatures, making them expensive and difficult to produce. The discussion highlights a specific need for large crucible parts, measuring 200mm in diameter and 400mm in length, with currently available materials being semi-sintered and not meeting the desired specifications. A previously encountered sample of light yellow boron nitride was noted for its smooth, semi-transparent quality, contrasting with the white, powdery material recently acquired. The conversation also references research indicating that achieving a relative density above 96% in hBN powder sintering is currently impossible, even at high temperatures. The thread concludes with a call for information on suppliers of fully sintered boron nitride and their maximum size offerings.
gwj0606
Messages
2
Reaction score
0
TL;DR Summary
Anyone can supply slightly yellow, fully sintered boron nitride ceramic?
I understand that boron nitride has quite high sintering temperature so it is not easy and could be quite expensive to get fully sintered material. But there are something available, right? I think I saw a small smaple of lilght yellow boron nitride ceramic years ago, but I don't remember the manufacturers name. It was quite smooth and semi-transparent, like alumina(I'm quite sure it's not PBN, because it's a block of about 1" cube). I believe it should be a fully sintered one. However, the BN I recently obtained are quite white, not transparent, and can be scraped off into powder. I guess it should be semi-sintered material, not fully sintered.

My job is now working on a quite big crucible like parts, that requires about 200mm Dia. x 400mm L in size. We puchased some [Link redacted by the Mentors], as they are the only one we found that could make such big parts. The parts are acceptable but, like what I said, they are more like a semi-sintered material. I was wondering is there anyone knows who can supply the fully sintered material? And, the maximum size available?
 
Last edited by a moderator:
Engineering news on Phys.org
Thread 'Where is my curb stop?'
My water meter is submerged under water for about 95% of the year. Today I took a photograph of the inside of my water meter box because today is one of the rare days that my water meter is not submerged in water. Here is the photograph that I took of my water meter with the cover on: Here is a photograph I took of my water meter with the cover off: I edited the photograph to draw a red circle around a knob on my water meter. Is that knob that I drew a red circle around my meter...
Hi all, i have some questions about the tesla turbine: is a tesla turbine more efficient than a steam engine or a stirling engine ? about the discs of the tesla turbine warping because of the high speed rotations; does running the engine on a lower speed solve that or will the discs warp anyway after time ? what is the difference in efficiency between the tesla turbine running at high speed and running it at a lower speed ( as fast as possible but low enough to not warp de discs) and: i...
Back
Top