CERAMIC MATRIX COMPOSITE AND METHOD AND ARTICLE OF MANUFACTURE

摘要

A ceramic matrix composite comprising: a matrix; a fiber preform embedded within the matrix; and wherein the matrix includes a rigidization layer, an infiltration layer, and a barrier layer sandwiched between the rigidization layer and the infiltration layer. The infiltration layer step illustratively may include particulate infiltration and melt infiltration. The illustrative method may further include the step of coating the fiber with an interface coating or layer. Illustratively, each of the fiber interface layer, the rigidization layer and the barrier layer may be deposited by any suitable method including without limitation CVI. The illustrative method of manufacturing a CMC may produce a relatively dense CMC, for example having a porosity of less than about 5% by volume, n some embodiments of the CMC and/or the method there will be a fiber interface coating or layer. Illustratively, the type and need for such an interface coating is generally a function of the type of fiber used. For example, a fiber interface coating, illustratively of boron nitride (BN) or pyrolytic carbon (PyC), is recommended or required for use with SiC or SiNC fiber. In the case of carbon fibers, a carbon interface illustratively might be used. In the case of oxide fibers, an interface layer illustratively may or may not be used. In any event, the fiber interface coating or layer illustratively may be deposited by for example chemical vapor infiltration (CVI) or other suitable method on the surface of the fiber. Illustratively, the fiber interface coating or layer generally encapsulates, surrounds or coats the fiber. lllustratively, the fiber interface coating or layer comprises between about 0.09 % and about 11 % of the total volume of the CMC. [0010] Illustratively, the rigidization layer or portion of the CMC and/ or method may be provided, deposited or introduced by for example CVI. Illustratively, the rigidization barrier may be any suitable material for example and without limitation it may comprise SiC. Illustratively, the rigidization layer comprises between about 14 % and about 41 % of the total volume of the CMC.