摘要:
The present invention is embodied in a method of producing a ceramic foam. The steps for producing the ceramic foam include first mixing a liquid pre-ceramic resin with a liquid phenolic resin, second allowing the resultant mixture to chemically foam, third curing the mixture for a time and at a temperature sufficiently to convert the mixture to a polymeric foam, and then heating the resultant polymeric foam for a time and at a temperature sufficiently to completely break-down polymers of the polymeric foam and convert the polymeric foam to a ceramic foam.
摘要:
The present invention is a dowel-adhesive method for repairing ceramic matrix composites. The dowel adhesive method embodied in the present invention incorporates both adhesive and mechanical bonding of a patch to a damaged CMC surface area. The damaged area is first identified and then pre-processed. Next, a CMC patch plug is produced and adhesively and mechanically bonded to the pre-processed area. Mechanical bonding is accomplished with dowel pins and corresponding dowel pin holes in the patch plug and the panel. The dowel pins anchor the CMC patch plug to the panel. Adhesive bonding is accomplished by placing a ceramic adhesive between the patch plug and the panel. Also, the dowel pins are adhesively bonded within the dowel pin holes of the plug and the panel. The ceramic adhesive is set by a low temperature cure (if required) and a high temperature firing.
摘要:
The present invention is a low cost carbon fiber-coating produced via a precursor/solvent solution and the methods and processes for fabricating such a carbon fiber-coating. The carbon fiber-coating comprises a fibrous substrate or fabric material and a carbon coating. The carbon coating prior to carbonization, is comprised of a coating solution made of a precursor dissolved directly within a solvent. Fabrication is achieved by first desizing the fibrous substrate, second immersing the desized fibrous substrate in the coating solution, third evaporating the solvent and curing the precursor via a low temperature pyrolysis in preferably an inert atmosphere, and fourth carbonizing the coating via a high temperature pyrolysis. These steps can be repeated as necessary, depending on the desired final thickness of the carbon coating. Multiple applications of the carbon coating can be used to provide limitless final coating thickness.
摘要:
A ceramic composite panel comprising, a pair of skins disposed in spaced relationship to one another and, a ceramic foam disposed between the pair of skins is disclosed. The pair of skin comprises fibers disposed in a pre-ceramic resin in its ceramic state. The foam comprises a cured mixture of a pre-ceramic resin and a phenolic resin.