Making hot pressed silicon nitride by use of low density reactio

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

1983-07-19

1994-04-12

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

264325, 264332, B28B 1100, C04B 3558

Patent

active

053023285

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.

REFERENCES:
patent: 3467745 (1969-09-01), Lambertson
patent: 3535132 (1970-10-01), Lunde
patent: 3589880 (1971-06-01), Clark
patent: 3632708 (1972-01-01), Mandorf
patent: 3835210 (1974-09-01), Kirkpatrick
patent: 3989438 (1976-11-01), Smith

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