Gun-Kote finish on knife blade?

[vwb563]

hello all. i have a question about baking a blade in an household oven. i have a spray on black teflon coating (gun-kote) finish that i ordered from brownells. im thinking about taking apart an all steel frame lock knife i have and spraying all the pieces, parts, and blade (except the nylon spacers) with the gun-kote finish and then i have to bake the parts in an oven at 300 degree for something like an hour. my question is this will keeping the blade in this degree of heat hurt the blade temper or will it come through the process just fine. i dont want to destroy the knife's edge holding ability. what do you guys think?,,thanks for the help.,,VWB.

 

[Don G.]

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[knarfeng]

Of what alloy is the blade made?

The temperature control on a household oven is a whole lot looser than that on a commercial process oven. Even if the alloy will take 300°F, you may not exactly get that in a kitchen oven. Make sure the alloy will take at least an extra 50°F. You might easily get that much variation in a household oven.

Also, commercial ovens are temperature profiled and then modified to make sure the temp is uniform throughout the oven. They don't do that for a household oven, so Before using a household oven, I would put a thermometer or thermocouple in, set the oven for 300°F and see what you get in that spot. Also, check it a couple times over a 2-hour period to determine how much variation you are going to see.

Make bloody well sure that the area is well ventilated. Such coatings produce all sorts of vapors during cure that are not healthy to breathe.

 

[vwb563]

i guess i should have specified the steel. it is 440C stainless. will that kind of heat hurt the blade temper?...VWB.

 

[knarfeng]

According to the Carpenter Steel data sheet for 440C, the tempering temp for 440C is 300F-800F.
They recommend 1 hour at 300F for maximum hardness.
I would guess that heating your 440C blade to 300F or 350F for an additional hour, could affect the hardness.
But that is only a guess.

 

[Bill DeShivs]

For this paint to remotely adhere to your blade, you will have to sandblast the surface before applying it. That said, it is paint-and will come off anyway.