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...

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Patent

CA 1247336

-16- ABSTRACT OF THE DISCLOSURE A method is disclosed of fully densifying a plurality of preformed ceramic plates by axial compression of the billets along a wall defining a cylinder and cavity. A series of the plates are stacked along the wall with the smallest dimension of the billets aligned with the axis of the cavity. The billets have a ratio of the smallest dimension to the largest dimension in the range of 1:3 to 1:40. The largest dimension of each of the plates is less than the lateral dimension of the cavity to leave an annular space; the space is filled with a pseudo isostatic pressing medium. The assembly is hot pressed under sufficient pressure and heat to convert the plates to billets of substantially full density.

456020

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