Binder for silicon carbide ceramic online reaction joint and preparation method thereof

Abstract

The invention discloses a binder for silicon carbide ceramic online reaction joint and a preparation method thereof. The composition of the binder for silicon carbide ceramic online reaction joint comprises the following components in percentage by weight: 25-35% of water, 5-7% of polyacrylamide, 1-2% of adhesive, 30-45% of silicon carbide micro-powder, 10-20% of silicon powder and 5-8% of carbon powder. The method comprises the following steps: (1) adding polyacrylamide in water, stirring to adequately dissolve polyacrylamide, and then adding the adhesive to prepare polyacrylamide solution; (2) sequentially adding Si powder, C powder and the silicon carbide micro-powder in the polyacrylamide solution to prepare slurry; (3) carrying out ball-milling on the slurry to obtain the binder. The binder disclosed by the invention has the same ingredients with a blank, thus avoiding the sintering deformation due to non-uniform ingredients; the solid content is proper, thus ensuring the flowability of the slurry; the water amount is proper, thus avoiding the reduction of a binding effect due to the too fast slurry absorption of the blank; moreover, the silicon powder and the carbon powder are added in the binder according to stoichiometric ratio, thus avoiding carbon enrichment or silicon enrichment in the sintered products.

Description

technical field [0001] The invention relates to the field of silicon carbide ceramics, in particular to an adhesive for online reaction connection of silicon carbide ceramics and a preparation method thereof. Background technique [0002] Due to its many advantages, such as high strength, high hardness, high elastic modulus, excellent thermal stability, high thermal conductivity, low thermal expansion coefficient, good specific stiffness and optical processing performance, silicon carbide ceramics are especially suitable for precision The application of motion platform skeleton, suction cup, water cooling plate, and precision measuring mirror, grating and other components. Therefore, silicon carbide ceramic materials, as one of the materials for preparing lithography machine components, have received extensive attention. Most of the ceramic parts required by lithography machines are hollow structures, and some parts are large in size. For these structural parts, two parts, ...

AI Technical Summary

Problems solved by technology

Using the binder of phenolic resin and aggregate silicon carbide particles to bond the silicon carbide body, the bond strength is high, but it will bring two problems for the precision manufacturing of silicon carbide. One is that after the phenolic resin is cured, The hardness is very high, and the green body is difficult to process; the second is that the phenolic resin binder is coated on the surface of the silicon carbide green body, and there is a problem in the adsorption of the silicon carbide green body to the phenolic slurry

Easy to cause voids in the bonding layer

Images