Hand Tools

Subject:
A minerology lesson
Response To:
Re: Enlighten me ()

Bill Tindall, E.Tn.
Dana lists no known mineral of composition- Cr2O3. From this fact it can be concluded that no natural source of chromium oxide was historically used as an abrasive.

It is easy to make "chromium oxide pigment" which is in fact a hydrated chromium oxide. Wrong crystal structure for the abrasive material. I don't know how the abrasive is made, but my guess would be by firing the pigment. As soon as it was discovered that chromium oxide could assume the crystal structure of corundum it would have been obvious to try it as an abrasive, if not before. I have no idea when this discovery happed, but likely historically relative to submicron alumina.

While crushing aluminum oxide to form an abrasive began centuries ago by crushing Corundum, and later synthetic aluminum oxide, the sub micron abrasive "alumina" is derived from another process. I doubt the fundamental knowledge to develop this process was known before about 1950's.

Messages In This Thread

Is chromium oxide honing compound still relevant
Re: Is chromium oxide honing compound still releva
Re: Is chromium oxide honing compound still releva
Re: Is chromium oxide honing compound still releva
Visually similar *LINK*
Re: Is chromium oxide honing compound still releva
Re: Is chromium oxide honing compound still releva
Re: Is chromium oxide honing compound still releva
That is what I am going to experiment with
Re: Is chromium oxide honing compound still releva
Re: Is chromium oxide honing compound still releva
Appearance...
Re: Appearance...
Re: Is chromium oxide honing compound still releva
to repeat the question....
Re: to repeat the question....
Re: to repeat the question....
Re: to repeat the question....
Re: to repeat the question.... *LINK*
Re: Good link, thanks. *NM*
sources
PS
Re: sources
Wiley you nailed it, I think
Diminishing returns
Re: Diminishing returns
Re: Diminishing returns
Re: Diminishing returns
Re: Diminishing returns
Re: Wiley you nailed it, I think
Green and white vs. white
Historical methods
Re: Historical methods
Re: Historical methods
Extrapolation of scenarios
Re: Extrapolation of scenarios
Re: Extrapolation of scenarios
I hope brian doesn't show up...
Re: I hope brian doesn't show up...
Enlighten me
No clue about historical..
Re: Enlighten me
A minerology lesson
Re: A minerology lesson
Re: A minerology lesson *LINK*
I stand corrected
Re: Enlighten me
The emphasis on speed...
What do I have?
Something called the ‘Koch System’
Historical yet again
Re: Something called the ‘Koch System’
The wax thing...
Re: The wax thing...
Re: Is chromium oxide vs aluminum oxide +...
Two questions remain
My opinion..
Marketing with the compounds...
G-456--not that it's practical
Or not...illegal to ship?
polishing stainless
Re: polishing stainless
© 1998 - 2017 by Ellis Walentine. All rights reserved.
No parts of this web site may be reproduced in any form or by
any means without the written permission of the publisher.

WOODCENTRAL, P.O. BOX 493, SPRINGTOWN, PA 18081