초록

The present invention provides a method of making a shaped ceramic-ceramic composite articles, such as gas-fired radiant heat burner tubes, heat exchangers, flame dispersers, and other furnace elements, having a formed-on ceramic-ceramic composite thereon.

대표청구항 ▼

A method of making a modified, shaped ceramic-ceramic composite article, said method comprising the steps of: (a) providing first fiber selected from the group consisting of ceramic fiber, carbon fiber, and combinations thereof, said first fiber (i) being in a fibrous form, (ii) capable of being pro

A method of making a modified, shaped ceramic-ceramic composite article, said method comprising the steps of: (a) providing first fiber selected from the group consisting of ceramic fiber, carbon fiber, and combinations thereof, said first fiber (i) being in a fibrous form, (ii) capable of being provided in a fibrous form, (iii) or a combination thereof; (b) providing a shaped ceramic-ceramic composite article comprising second fiber having a surface which is available for coating and a coating comprising silicon carbide, silicon nitride, or a combination thereof at least partially covering said surface which is available for coating, said second fiber being selected from the group consisting of ceramic fiber, carbon fiber, and combinations thereof; (c) providing a chemical vapor deposition chamber assembly capable of holding a fibrous form adjacent to at least a portion of a surface of said shaped ceramic-ceramic composite article, said assembly including means for providing a thermal gradient between first and second sides of said fibrous form; (d) assembling the components of (a), (b), and (c) to provide a chemical vapor deposition chamber assembly holding a fibrous form comprising said first fiber adjacent to at least a portion of a surface of said shaped ceramic-ceramic composite article, said fibrous form being arranged such that said first and second sides of said fibrous form are arranged in said assembly such that said means for providing a thermal gradient can provide a thermal gradient between said first and second sides of said fibrous form; and (e) providing a thermal gradient between said first and second sides of said fibrous form such that there is a hot region and a cold region, infiltrating and depositing via chemical vapor deposition silicon carbide, silicon nitride, or a combination thereof onto at least a portion of said surface of said first fiber and depositing said silicon carbide, silicon nitride, or a combination thereof onto at least a portion of said surface of said shaped ceramic-ceramic composite article, wherein said infiltration of silicon carbide, silicon nitride, or combination thereof proceeds from said hot region to said cold region of said fibrous form of said first fiber.