Ceramic Blade RC

Mark J

Mark J

Joined
Mar 15, 2001
Messages
2,450
Does anybody know the RC of a ceramic blade? Even a rough guess would be useful.

- Mark
 
I doubt about "shaving" glass, since even the diamond cutters just scratch it. I.e. cutting is done by chipping or fracturing the crystal structure.

Other than that, from what I've read here and there RC is above 70 or even 80rc.
 
Gator97 said:
I doubt about "shaving" glass, since even the diamond cutters just scratch it. I.e. cutting is done by chipping or fracturing the crystal structure.

Other than that, from what I've read here and there RC is above 70 or even 80rc.
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You haven't seen a MirageX knife have you?

I'm not promoting MD knives, just telling you what the ceramics of a MD knife can do.

If anyone thinks that they can do the same with a Kyocera or Boker, they'll find out that there isn't just one type of ceramic used in knives.
 
Since the Rockwell test is done by measuring the indention produced by a given force against given area, I seriously doubt you can use that test on most glass or ceramics. They'll shatter before they indent,
 
CWL said:
You haven't seen a MirageX knife have you?
Click to expand...
No I have not. I was merely stating the nature of the glass, which is a crystal structure, hence "shaving" it in a common sense is not possible.
Diamond is still harder than MirageX, and it can't do shaving either.
 
The only thing I can find is from Boker. They state that their blades are hard than the Rockwell C scale. All of the Rockwell C charts that I can find list 68 as the highest RC #.
 
I also have a hard time imagining anything 'shaving' glass, but I want to point out that glass is NOT crystalline in structure. By definition, it is amorphorphous, i.e. without form.

And I have no idea of it's harness. Sorry.

Frank
 
presz said:
The only thing I can find is from Boker. They state that their blades are hard than the Rockwell C scale. All of the Rockwell C charts that I can find list 68 as the highest RC #.
Click to expand...

Hmm, so what scale do they use if not the Rockwell? Mohs?

- Mark
 
Glass is technically a mineral, Mohs scale 7. Steel is usually between 5-6.

Mohs is a scratch test.
 
I have some Puma lockbacks that have ceramic blades (Keramik).
No hardness listed but I can attest that they are indeed very sharp.
The paper in the box is in German. I will translate to see if it says anything.
 
Frank_Zuccarini said:
I also have a hard time imagining anything 'shaving' glass, but I want to point out that glass is NOT crystalline in structure. By definition, it is amorphorphous, i.e. without form.

And I have no idea of it's harness. Sorry.

Frank
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Yup, back when I was in school, glass was a liquid, a very viscous liquid. If you ever happen to be in a house with 2-300 year old windows, you can see that the glass has flowed over time, and the panes are thicker at the bottom.
 
Leftoverdj said:
Yup, back when I was in school, glass was a liquid, a very viscous liquid.
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according to wikipedia it's an amorphous (non-crystalline) solid.

it says that the old winders werent perfectly flat because of how they were made and were placed thick side down.

so idk,i know wiki isnt 100% legit but usually it's pretty spot on.
 
ceramic is used to cut some diamonds and diamonds are 10 mohs. some ceramics are upwards of 12 mohs.
not sure how that translates into RC
 
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