Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1987-08-06
1989-06-20
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
264 56, 264 86, 264 87, 501 95, C04B 3328
Patent
active
048407631
ABSTRACT:
A process for the production of reinforced refractory composite structures which may be of high density and shaped in desired three dimensional configurations. The shaped composite structures are produced by forming a suspension of particulate materials including a colloidal refractory power, colloidal sintering aid, and refractory reinforcement whiskers in a carrier liquid. The colloidal suspension is conformed to a desired configuration and brought into contact with a semipermeable membrane. A pressure is imposed on the suspension in the desired configuration to expel liquid from the suspension through the membrane to arrive at a green composite having a density of at least 40% of theoretical density. After drying, the green composite is then sintered under conditions to form an intergranular liquid phase in the composite providing further densification. A specific composite is a silicon carbide reinforced silicon nitride composite. The green composite may be sintered to provide a density of at least 93% of theoretical to produce a closed impermeable composite surface. The composite may then be subjected to hot isostatic pressing.
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Cate James M.
Derrington James
LTV Aerospace and Defense Company
Sadacca Stephen S.
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