Making hot pressed silicon nitride by use of low density...

Details Making hot pressed silicon nitride by use of low density... Making hot pressed silicon nitride by use of low density...

B - Operations, Transporting

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F

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B22F 3/00 (2006.01) C04B 35/593 (2006.01)

Patent

CA 1227624

- 14 - ABSTRACT OF THE DISCLOSURE A method of making a silicon nitride comprising object by use of a low density reaction bonded body is disclosed. An uncompacted mixture of silicon powder and a fluxing agent is heated in a nitrogen atmosphere to react the mixture with the atmosphere to form a body consisting essentially of silicon nitride and having a dimension greater than and a density less than the finished product. The nitrided mixture is then hot pressed to produce a silicon nitride comprising object of desired dimension and density,which material is useful as a cutting tool material for machining metals.

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