Method for producing a silicon carbide shaped body
AssigneeEvonik Degsussa GmbH
InventorsJulia LYUBINA, Michael KROELL
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Abstract
The invention relates to a method for producing a shaped body that contains at least 85 vol. % crystalline silicon carbide and at most 15 vol. % silicon, comprising the following steps: a) providing a powdered mixture that contains at least 60 vol. % amorphous silicon carbide and at most 40 vol. % silicon having a crystallite size of 3-50 nm; b) shaping the mixture by b1) hot pressing, or b2) compacting at room temperature and subsequent sintering or hot pressing, wherein the sintering or hot pressing is carried out in an inert gas or vacuum at a temperature of at least 1400° C. The volume ratio SiC:Si in the powdered mixture is 95:5-99:1.
Claims11
A process for producing a shaped body, the method comprising the steps of:
- a) providing a pulverulent mixture comprising at least 60% by volume of amorphous silicon carbide and not more than 40% by volume of silicon having a crystallite size of from 3 to 50 nm, and
- b) shaping the pulverulent mixture by either b1) hot pressing or b2) compacting at room temperature and subsequent sintering or hot pressing,
- wherein the shaped body comprise at least 85% by volume of crystalline silicon carbide and not more than 15% by volume of silicon, and
- the sintering or hot pressing is carried out under inert gas or reduced pressure at a temperature of at least 1400° C.
Dependencies are inferred from the claim text.