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Old 06-18-2015, 11:33 PM
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mwhuston mwhuston is offline
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Dry Ice Cryo Treatment

I'm thinking about doing some 440c chef knives for Christmas this year and was wondering if using Dry Ice and Denatured Alcohol would work for the cryo treatment? I know it isn't as good as liquid nitrogen, but it is significantly cheaper for a non professional.

This is dependent upon my oven getting to 1900 degrees and holding steady. If not I'll send them out for professional HT.


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Old 06-19-2015, 12:26 AM
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Ray Rogers Ray Rogers is offline
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QUOTE: This is dependent upon my oven getting to 1900 degrees and holding steady.

That's very true so if you have an electric furnace you're good to go, otherwise send it out.

The dry ice cryo will help but use kerosene or diesel fuel instead of the alcohol. Put the blade in as soon as it has cooled to room temperature, leave it over night (which is longer than necessary but I find it convenient), and pull it out the next day. Let it warm to somewhere close to room temp and then start your tempering cycles.

Some guys like to temper once before cryo and that's OK but you must always do at least one tempering cycle after cryo so I find it more convenient to simply cryo first and then do all the tempering...


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Old 06-19-2015, 11:32 AM
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mwhuston mwhuston is offline
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Ray, What are the advantages of using diesel or kerosene instead of alcohol?


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Old 06-19-2015, 04:51 PM
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Honestly, I don't know. I use LN but whenever I have read anything about dry ice cryo they have always said kerosene or diesel. Maybe something to do with the density of the liquids, maybe they don't want to breathe the alcohol fumes. If you have it on good authority that alcohol will perform well then go for it. I'm not sure about alcohol but at least diesel is fairly affordable ...


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Old 06-20-2015, 12:05 AM
Doug Lester Doug Lester is offline
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I think that the problem with alcohol, and we're probably talking rubbing or denatured alcohol, is that it contains so much water and will form a slush. Even absolute alcohol will rapidly go to 90% alcohol if left open because it will absorb water from the atmosphere. A problem in the cytology department when fixing tissues.

Doug


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440c, art, blade, chris, christmas, cryo, degrees, heat treat, knife, knives, problem


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