Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Producing or treating porous product
Patent
1995-05-08
1997-03-11
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Producing or treating porous product
264430, 264431, 264434, 264486, 264 295, 264 296, 264 297, 264 406, 264 81, 423445R, 423448, 423460, 427113, 427227, 427249, B29C 3512
Patent
active
056098154
ABSTRACT:
A process for manufacturing carbonaceous parts including the steps of shaping a mixture of carbonaceous powder and bonding agent to form raw parts, cooling the raw parts to ambient temperature at a known rate and firing the cooled parts in a furnace from ambient temperature to a final firing temperature to release volatile particles to produce fired parts devoid of volatile products. This process is improved by placing the raw parts in an electric furnace in the absence of heating filler, heating the raw parts in the furnace to an intermediate temperature of about 200.degree. C. at a fixed initial heating rate such that the loss of volatile products is less than 10% by weight of the total amount of volatile products contained in the raw parts and being a function of the cooling rate such that the internal strain from the shaping and cooling step is freed. The raw parts are then heated from the intermediate temperature to the final firing temperature, both heating steps taking place under a flow of non-oxidizing gas in the electric furnace to reduce the partial pressure of the volatile products near the surface of the parts, the gas flow compensating for loss of the volatile products.
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Le Carbone Lorraine
Thurlow Jeffery R.
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