Method for producing SiC fiber-reinforced SiC composite material by means of hot press
AssigneeJapan Science and Technology Corporation
InventorsAkira Kohyama, Yutai Katoh
Life of this patent
Estimating the term…
Abstract
A powdery mixture of fine SiC powder with one or more oxide sintering additives of Al2O3, Y2O3, SiO2 and CaO is blended and uniformly dispersed in a polymeric SiC precursor to prepare a matrix-forming polymeric slurry. A preform of SiC fiber, which has quasi-stoichiometric composition with high crystallinity, is impregnated with the polymeric slurry and then hot-pressed at a temperature of 1600° C. or higher in presence of a liquid phase. Since the heat-resistant SiC fiber is used as strengthening fiber, the prepreg is sintered to a dense SiC composite excellent in mechanical properties by one-step hot-pressing.
Claims2
A hot-pressing method of manufacturing a SiC-matrix composite reinforced by SiC fiber, which comprises the steps of:
- providing a powdery mixture of fine SiC powder with one or more sintering additives selected from Al2O3, Y2O3, SiO2 and CaO;
- preparing a matrix-forming slurry by blending said powdery mixture in a polymeric SiC precursor;
- impregnating a preform of SiC fiber, which has quasi-stoichiometric composition with high crystallinity, with said slurry;
- and
- hot-pressing said SiC fiber impregnated preform at a temperature between 1600° C. and 1850° C. with a pressure of 10-20 MPa in presence of a liquid phase resulting from reaction of the sintering additive or additives with fine SiC powder.
Dependencies are inferred from the claim text.