초록 ▼

An intermediate member is formed as a semifinished product and includes at least two films or sheets of carbon containing material. Both sheets, such as prepegs, are initially in a still deformable state. One film or sheet is plane, the other is profiled and then the two are bonded to each other, br

An intermediate member is formed as a semifinished product and includes at least two films or sheets of carbon containing material. Both sheets, such as prepegs, are initially in a still deformable state. One film or sheet is plane, the other is profiled and then the two are bonded to each other, brought into the desired final form and cured. The final form is then heated while air is excluded for coking the carbon so that only a carbon skeleton remains. Such skeleton may be further reinforced by again impregnating the skeleton with a carbon containing resin and again coking. The carbonized or coked final form is enriched by metallic silicon, whereby the silicon precipitates by decomposition. Simultaneously with the enriching step or thereafter the final form is heat treated again to cause the formation of silicon carbide by the reaction C+SI→SiC.

대표청구항 ▼

A method for manufacturing a ceramic body for use under thermal stress operating conditions, comprising the following steps: (a) providing a first plane film made of a matrix material holding a carbon material content within the range of 50% to 80% by weight of said matrix material, said first plane

A method for manufacturing a ceramic body for use under thermal stress operating conditions, comprising the following steps: (a) providing a first plane film made of a matrix material holding a carbon material content within the range of 50% to 80% by weight of said matrix material, said first plane film being in a still deformable state, (b) providing a second profiled film also made of material including a carbon material content within said range, said second profiled film also being in a deformable state, (c) arranging said first plane film on one side of said second profled film to form hollow spaces between said first and second films, (d) bonding said first and second films to each other at bonding locations where said first and second films contact each other to form an intermediate member in which said hollow spaces are located between adjacent bonding locations, (e) shaping said intermediate member into a desired final shape, (f) curing the final shape, (g) heating the final shape in an enclosed heater to a temperature within the range of 600°C. to 1000°C. while excluding air from said heater, said temperature being sufficient for coking or carbonizing said carbon material to provide a carbonized final form, (h) exposing said carbonized final form to a silicon containing substance, which upon further heating will be decomposed to leave elementary silicon metal, (i) and then further heating said carbonized final form including said silicon material to a temperature in the range of 1350°C. to 1800°C. sufficient to react the carbon material and the silicon metal to product silicon carbide (SiC) as an integral component of said ceramic body.