SiC(w)/Al 2 O 3 composites were made from an AlCl 3 -H 2 -CO 2 mixture by a thermal-gradient chemical vapor infiltration (CVI) method. Al 2 O 3 was deposited from the reaction of AlCl 3 and H 2 O, which was produced from the oxidation of H 2 by CO 2 . The densification rate was measured at various reactant compositions and total pressures. When the reaction rate or total pressure increased, the rate-controling step shifted from H 2 O production to AlCl 3 diffusion, which led to premature pore closing. To obtain dense composites in a short infiltration time, the diffusion rate of AlCl 3 had to be increased by decreasing the total pressure.
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