Method of making graphite forming dies

Details Method of making graphite forming dies Method of making graphite forming dies

C - Chemistry, Metallurgy

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B

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C04B 41/85 (2006.01) B28B 7/34 (2006.01) B32B 18/00 (2006.01) C04B 41/50 (2006.01) C04B 41/52 (2006.01) C04B 41/87 (2006.01) C04B 41/89 (2006.01) C23C 2/04 (2006.01) C23C 4/06 (2006.01) C23C 6/00 (2006.01) C23C 30/00 (2006.01)

Patent

CA 1301565

-10- Abstract A method is disclosed for making a chemically coated graphite forming die, which graphite die is not only easily machinable prior to coating, but is low in cost and has highly increased wear resistance both at room temperature and elevated temperatures. The method of this invention comprises: (a) machining a graphite based substrate to a shaped form with surfaces defining a desired profile; (b) chemically reacting molten silicon or silicon based alloy with at least certain surfaces of the shaped form while under a vacuum or inert atmosphere for a period of time and at a temperature to form a protective chemically bonded coating on said surfaces, said coating consisitng predominantly of beta silicon carbide and having silicon present in an amount no greater than 20% by weight.

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