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 Post subject: >> Zirconia 206 Ceramic <<
PostPosted: Sun Apr 21, 2013 6:31 am 
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My girlfriend chipped my ceramic Kyocera Kyotop 155mm gyuto awhile back, and I just repaired her on diamond. I started cautiously on the Atoma 1200, and it didn't cut the ceramic. I went down to an Atoma 600, and saw some removal but not much. I pulled out the Atoma 140 with total faith I would get past those chips in no time. damn is this stuff hard! I got past the chips, but the 140 is so coarse & the ceramic so brittle... it ate the edge & caused 5 times more damage than had been originally inflicted. I was so pissed.

I went back up to the 600, and it's one of Ken's quarter plates so it's like 2"x3"... IT TOOK FOREVER TO GRIND PAST ALL THE CHIPPING W/THAT LITTLE DAMN THING. Anyhow, the progression went Atoma 600, Atoma 1200, then Ken's 6 micron diamond film on glass. It needs 3 micron & 1 micron lapping to get close to my steel edges, but damn does it feel nice in the meantime.

This was my first time sharpening a ceramic blade, and I'm really surprised how the ceramic cutting edge polishes out to look very similar to steel. It didn't come that way; new it was totally black.


BEFORE:

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Image

AFTER:

Image

Image

Image



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 Post subject: Re: >> Zirconia 206 Ceramic <<
PostPosted: Sun Apr 21, 2013 4:08 pm 

Joined: Fri Mar 29, 2013 10:29 pm
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You should thank your girlfriend for giving you a reason to do this. Looks awesome.


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 Post subject: Re: >> Zirconia 206 Ceramic <<
PostPosted: Sun Apr 21, 2013 4:54 pm 
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...and of course there is no bur formation, necessitating good use of a electron microscope/loupe.

Good patience exercised there!

I have the Kyotop parer - yep the edge shines just like steel when done.

:)



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 Post subject: Re: >> Zirconia 206 Ceramic <<
PostPosted: Sun Apr 21, 2013 7:06 pm 
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RED <> Thank you... I can't help but enjoy looking at the edge, as well. :mrgreen: As for thanking her... that's going to be a difficult one.

"Hey babe, thanks for chipping my $250 knife... so I could sharpen it! I'm so glad I had to spend an extra $80 on a 6 micron glass plate, and I'm even more glad I have to buy the 3 micron & 1 micron plates to get the knives to where I want them!"

I can hear my sarcasm exuding in the mind, percolating even amid the hypothetical.

ROOK <> An exercise in patience it was...



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 Post subject: Re: >> Zirconia 206 Ceramic <<
PostPosted: Sun Apr 21, 2013 8:07 pm 
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Location: San Ramon Ca.
Thats some nice work there!



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 Post subject: Re: >> Zirconia 206 Ceramic <<
PostPosted: Sun Apr 21, 2013 11:55 pm 
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Thanks Pete. :mrgreen: It's meditative for me...



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 Post subject: Re: >> Zirconia 206 Ceramic <<
PostPosted: Mon May 13, 2013 12:43 am 
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Yea, I had to 'thank' my wife for using my Moritaka Nakiri to HACK some stale french bread into croutons:( Completely chipped out the entire edge - on the original edge that I wanted to study a bit more before putting my own edge on it. Reminds me of my previous dog tearing up a couch down to the frame - a 'chance to redecorate'. Yikes!

Ceramics do take a long time, even using diamonds (Regular stones are useless here). And refining the edge is certainly possible as they do take a real nice edge. Diamond films are the way to go on ceramics, especially with the Heavy duty films I now stock.

Beyond 1 micron films, you can go to half or even tenth micron films OR you can use your diamond compounds on strops. As you are not dealing with burrs or carbides, you can take it all the way up to tenth micron (probably to 0.025 microns) if you wish .

Nicely done!

---
Ken



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 Post subject: Re: >> Zirconia 206 Ceramic <<
PostPosted: Mon May 13, 2013 1:33 am 
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KEN <> Beyond the obvious hardness, it took so long because the 600 Atoma was your 1/4 plate... not a lot of surface area.

When funds permit I will get the 1 & 3 micron HD plates from ya, but I don't think I want to bring her any further.



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