Making hot pressed silicon nitride by use of low density reaction bonded body
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United States of America Patent
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Apr 12, 1994
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N/A
app pub date -
Jul 19, 1983
filing date -
Jul 19, 1983
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Expired
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Abstract
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.
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