Photosensitive resin-based carbon source/silicon carbide ceramic slurry, method for preparing porous carbon/silicon carbide green body, structural member and preparation method of structural member

Abstract

The invention mainly aims to provide a photosensitive resin-based carbon source / silicon carbide ceramic slurry, a method for preparing a porous carbon / silicon carbide green body, a reaction sintered silicon carbide structural member and a preparation method of the reaction sintered silicon carbide structural member. The photosensitive resin-based carbon source / silicon carbide ceramic slurry comprises 50-70% of photosensitive resin and 30-50% of a powder material; the powder material comprises silicon carbide powder and phenolic resin powder; and the photosensitive resin comprises a monofunctional monomer, a bifunctional monomer, a trifunctional monomer, a photoinitiator, an adhesion promoter and a polymer dispersant. The preparation method of the porous carbon / silicon carbide green body comprises the following steps: preparing the photosensitive resin-based carbon source / silicon carbide ceramic slurry, carrying out photocuring 3D printing molding, and carrying out vacuum biscuiting; and carrying out high temperature siliconizing sintering. The technical problem to be solved is that a high-density and high-strength reactive sintering silicon carbide structural member can be manufactured, the density of the structural member is greater than or equal to 2.7 g / cm<3>, and the bending strength is greater than or equal to 270.0 MPa, so that the structural member is practical.

Description

technical field [0001] The invention belongs to the technical field of silicon carbide ceramics manufacturing, and in particular relates to a method for preparing a photosensitive resin-based carbon source / silicon carbide ceramic slurry, a porous carbon / silicon carbide green body, a reaction sintered silicon carbide structural part and a preparation method thereof. Background technique [0002] Silicon carbide (SiC) is a ceramic material with excellent performance, which has the advantages of high strength, high stiffness and high stability, and is widely used in aerospace, semiconductor and nuclear industries. However, silicon carbide is a covalent bond compound with a strong Si-C bond, which is difficult to process because of its high hardness; while traditional molding processes, such as grouting molding, dry pressing molding and gel injection molding, etc., are difficult to prepare high-precision and complex structures. Silicon carbide components have certain limitations...

AI Technical Summary

Problems solved by technology

However, at present, the light-curing molding technology of silicon carbide ceramics faces many technical difficulties, mainly in the following aspects: 1. Most of the photosensitive resins use two-component resins, such as bifunctional monomers and trifunctional monomers. Resin is prepared from raw materials; although this kind of resin has outstanding performance in terms of photocuring rate and photocuring accuracy, the resin has high viscosity and poor fluidity, and the rheology of the resin needs to be improved; 2. Most photosensitive resins are non-polar , while powder materials are mostly polar, so it is difficult to disperse when the two are compatible, making the viscosity of the mixture very high, and it is difficult to obtain a slurry with high solid content and low viscosity; 3. Use photosensitive resin as porous carbon / carbon source of silicon carbide green body, but the carbon residue rate of general photosensitive resin is only about 7wt.%, it is difficult to increase the carbon content in porous carbon / silicon carbide green body, and it is difficult to obtain high strength and high density reaction sintering carbonization Silicon structure

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