US 2025/0313478 A1 · SILICON CARBIDE GRIT AND METHOD FOR PRODUCING SAME

Abstract

A silicon carbide gravel usable, for example, for refractory products, and a method for the production of different qualities and grain sizes of silicon carbide gravel. The silicon carbide gravel includes SiC particles having a high density. Particles of the silicon carbide gravel consist to an extent of at least 85 mass % of SiC waste products and have a density of 2.89 to 3.20 g/cm3, a compressive strength of >2500 MPa, a fraction of <5% of pores with an equivalent diameter of >100 μm and a fraction of open porosity of <10%. The silicon carbide gravel consists at least predominantly of particles with particle sizes of greater than or equal to 2 mm and the particles have an irregular shape produced by a mechanical loading.

Claims21

Dependent claims

A silicon carbide gravel, whose particles consist of at least 85% by mass silicon carbide from SiC waste products and have a density of 2.89 to 3.20 g/cm3, a compressive strength of >2500 MPa, a fraction of <5% of pores with an equivalent diameter of >100 μm, and a fraction of open porosity of <10%, wherein the silicon carbide gravel consists at least predominantly of particles with particle sizes of greater than or equal to 2 mm and the particles have an irregular shape with a roundness of 0.5 to 0.8 produced by a mechanical loading with an energy input of between 0.1 and 5 MJ/kg.

A method for the production of silicon carbide gravel, in which SiC waste products, except for SiC dust, are processed into SiC particles by mechanical loading with an energy input between 0.1 and 5 MJ/kg, which consist of at least 85% by mass of silicon carbide and have a density of 2.89 to 3.20 g/cm3, a compressive strength of >2500 MPa, a fraction of <5% of pores with an equivalent diameter of >100 μm, and a fraction of open porosity of <10%, and with particle sizes greater than or equal to 2 mm and an irregular shape with a roundness of 0.5 to 0.8,

or in which for the production of silicon carbide gravel, SiC waste products are processed into SiC particles before and/or after a temperature treatment under vacuum or non-oxidizing atmosphere at temperatures of 1400 to 2600° C. by mechanical loading with an energy input between 0.1 and 5 MJ/kg, which consist of at least 85% by mass of silicon carbide and have a density of 2.89 to 3.20 g/cm3, a compressive strength of >2500 MPa, a fraction of <5% of pores with an equivalent diameter of >100 μm, and a fraction of open porosity of <10%, and with particle sizes greater than or equal to 2 mm and an irregular shape with a roundness of 0.5 to 0.8,
or in which for the production of silicon carbide gravel, in which SiC waste products are processed into SiC particles before and/or after a temperature treatment under vacuum or non-oxidizing atmosphere at temperatures of 1400 to 2600° C. by mechanical loading with an energy input between 0.1 and 5 MJ/kg, which consist of at least 85% by mass of silicon carbide and have a density of 2.89 to 3.20 g/cm3, a compressive strength of >2500 MPa, a fraction of <5% of pores with an equivalent diameter of >100 μm, and a fraction of open porosity of <10%, and with particle sizes greater than or equal to 2 mm and an irregular shape with a roundness of 0.5 to 0.8, wherein such particles may be mechanically treated again, and at the same time or thereafter are physically separated into two fractions, of which the mass of impurities in one fraction is at least higher by a factor of 2 than in the other fraction.

Dependencies are inferred from the claim text.

Silicon carbide grit and method for producing same

Life of this patent

Silicon carbide grit and method for producing same

Life of this patent

Abstract

Claims21