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US 2024/0327296 A1Published application
Rotating seal ring material
AssigneeJohn Crane Inc.
InventorsSunilkumar C. Pillai, Ragini Thurpati, Klaus-Dieter MECK
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AssigneeJohn Crane Inc.
InventorsSunilkumar C. Pillai, Ragini Thurpati, Klaus-Dieter MECK
Estimating the term…
The present invention relates to an unsintered composite powder composition comprising silicon carbide and aluminium nitride, a sintering process and a sintered silicon carbide material obtained or obtainable therefrom, as well as a SiC—AlN composite ceramic, uses thereof and articles comprising the same. In one aspect, the present invention provides an unsintered composite powder composition comprising from 90.0% to 99.9% by weight silicon carbide and from 0.1% to 10% by weight of aluminium nitride. In another aspect, the present invention provides a SiC—AlN composite ceramic material having the formula x(SiC)—1-x (AlN), wherein 0.999≥x≥0.900; and wherein the composite ceramic material has a fracture toughness of greater than 4.5 MPa·m1/2; and a thermal conductivity of greater than 120 W/m K.
An unsintered composite powder composition comprising from 90.0% to 99.9% by weight silicon carbide and from 0.1% to 10% by weight of aluminium nitride.
An unsintered composite powder composition according to any preceding claim, wherein the composition consists essentially of silicon carbide and aluminium nitride.
An unsintered composite powder composition according to any preceding claim, wherein the composition consists of silicon carbide and aluminium nitride.
An unsintered composite powder composition according to any preceding claim, wherein the silicon carbide comprises alpha-silicon carbide.
An unsintered composite powder composition according to any preceding claim, wherein the aluminium nitride comprises aluminium nitride nanoparticles.
An unsintered composite powder composition according to any preceding claim, wherein the silicon carbide comprises particles with an average particle size of 0.1 μm to 5 μm.
An unsintered composite powder composition according to any preceding claim, wherein the aluminium nitride comprises particles with an average particle size of 1.0 nm to 1,000 nm.
An unsintered composite powder composition according to any preceding claim, wherein the composition is obtainable by milling a slurry of silicon carbide powder and aluminium nitride powder in a liquid medium.
A SiC—AlN composite ceramic material obtainable by sintering an unsintered composite powder composition according to any preceding claim.
A SiC—AlN composite ceramic material having the formula x (SiC)—1-x (AlN), wherein 0.999≥x≥0.900;
Dependencies are inferred from the claim text.