Abstract
CVI (Chemical Vapor Infiltration) and pulse CVI process are reviewed. CVI is prominent in tight bonding between reinforcing fiber and matrix, however, is inferior in tedious processing time, nonuniformity of infiltration along the thickness and a limitation of the shapes of preform. On the contrary, powder-and fiber-preforms and porous materials with free shape can be infiltrated by pulse CVI. Pulse CVI of SiC from CH3SiCl3-H2 to porous carbon resulted in oxidation resistance over 1070h at 1573K in an air flow, and also increase of flexural strength by 2-3 times. RF-heated carbon fiber wound around carbon plate was effectively infiltrated by SiC. SiC powder preform, average particle size of 10μm, was strengthened to flexural strength of 240MPa after 30000 pulse of CVI. A combination of Si3N4 powder and BN matrix is also refered.
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