Clay coating with NO thin wash?

Kentucky

Kentucky

Joined
Dec 13, 2008
Messages
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Ive seen several people lately who are clay coating blades for hamons with no overall thin wash..Just a spine coating and ashi lines..Anyone have a comment on this? It does seem that the ones Ive seen are using parks 50 for a quench, not water...
Does anyone here leave outt he thin wash?
 
The one time I tried the clay coating, I used no thin wash. I put the Satanite on, let it dry and put it in the oven(where the clay proceeded to flake off, being dry). So, I reapplied the clay and it only got to dry long enough for the oven to equalize at 1450. That time, it stayed on and I got a successful and pretty cool Hamon on my (Aldo)W2 blade.
 
As long as the blade steel is protected. Thats the only issue. I use a separate coating of liquid PBC for the area thats to be fully hardened. Applying clay of a good consistency, is best accomplished by layering instead of a single layer.
 
The main difference is that a thin wash of the entire blade will add surface area and thus promote a slightly faster cooling (as well as providing an oxygen barrier). You will find people using both methods and both work.

Gary
 
Gary Mulkey said:
The main difference is that a thin wash of the entire blade will add surface area and thus promote a slightly faster cooling (as well as providing an oxygen barrier). You will find people using both methods and both work.
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Gary is right. Additionally, the rough texture of the clay wash provides a lot more nucleation points which can help disrupt the vapor jacket during the vapor phase of the quench. This leads to more quenchant contact with the surface that also help speed the quench.

-d
 
deker said:
Gary is right. Additionally, the rough texture of the clay wash provides a lot more nucleation points which can help disrupt the vapor jacket during the vapor phase of the quench. This leads to more quenchant contact with the surface that also help speed the quench.

-d
Click to expand...

So a thin coat of clay slip can actually improve the quench? I have been doing this for a while now to reduce decarb/warp and was "okay" with the possiblity of a slightly less efficient quench. Now, you are telling me it may be enhancing it?....... that would be great news.

Rick
 
Rick Marchand said:
So a thin coat of clay slip can actually improve the quench? I have been doing this for a while now to reduce decarb/warp and was "okay" with the possiblity of a slightly less efficient quench. Now, you are telling me it may be enhancing it?....... that would be great news.

Rick
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I'd be careful saying that it is a better quench. It simply helps cool the steel a little faster. ;) Not always a better thing.

Gary
 
Rick Marchand said:
So a thin coat of clay slip can actually improve the quench? I have been doing this for a while now to reduce decarb/warp and was "okay" with the possiblity of a slightly less efficient quench. Now, you are telling me it may be enhancing it?....... that would be great news.
Click to expand...

I learned this from Jesus Hernandez at Fire & Brimstone the other year. He should be able to provide details of who did the study he referenced.

-d
 
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