PBC Special Anti-scale compound ???

[Phil Dwyer]

Hi Fellas,

I'm trying to use PBC Special Anti-scale compound. The first time a tied it it worked pretty good, except it melted into the soft fire brick I had cut a groove into for a blade "stand" and had some fire brick attached when completed.

The next time I tried it I didn't put the blade in during the entire oven ramp up. Instead I waited until the oven was at 750 and put the blade in for about 5 minutes. I then took it out and covered in the PBC compound and set it aside to wait until the oven was at the full target temp. Problem was once the blade cooled the PBC just flaked off in two big flakes (one on each side).

I had read to put the blade in the oven once the oven was at full temp, but that doesn't seem to work when using this stuff. So, should I just do it more like my first time and have the blade(s) ramp up along with the oven? Or...???

Thanks, Phil

 

[Bill Hoffman]

Phil,

I just heat the blade gently until the anti-scale melts smoothly.
Let the blade cool so the stuff hardens up, and then do the heat treat.
Seems to work well, I get almost no scale at all, but you gotta
use HOT water to get the PCB off the blade.

Bill

P.S. It loves brick for dinner, put a piece of glazed tile in the bottom of your
oven.

 

[Bruce Bump]

I place the blade in the oven and remove it at about 800f and sprinkle the PBC on. It turns black and flows better at that temp. Any temp under 1000f is fine. The directions say 500 I think but it wont melt at that low of heat. After quench it will pop off in big flakes but the remainder comes off if you run it under hot water. Boiling water takes off any stubborn black stuff.

 

[Dan Pierson]

When I last used it I was using a piece of used HT foil wrap under the PBC coated blades to keep it off the oven floor. Probably go back to that now that the unplanned arrival of a forge (thank you IG) means that I'll be heat treating oil hardening steels again.

 

[indian george]

When I last used it I was using a piece of used HT foil wrap under the PBC coated blades to keep it off the oven floor. Probably go back to that now that the unplanned arrival of a forge (thank you IG) means that I'll be heat treating oil hardening steels again.

You are welcomed.:thumbup:

 

[WadeH]

Phil I have also been hearing good things about the liquid one. You just paint it on the blade and the do your heating. I think I heard that Brownells sold it.

 

[Longstrider]

I use a liquid PBC that a friend bought a whole batch of to ship over here (from the States) to the UK. I simply warm the blade then paint the compound on with a soft brush. The warmth of the metal causes the stuff to dry quickly allowing me to get on with things and get it in the oven within minutes. Never had a problem with it melting or anything like that, and it works a treat.
Can you not make a mixture of the stuff you are using with some water and try the same thing with that ?