Method for preparing recrystallized silicon carbide product through plastic method

Abstract

The invention discloses a method for preparing a recrystallized silicon carbide product through a plastic method. The recrystallized silicon carbide product is prepared from, by mass, 60-70 parts of silicon carbide coarse powder, 30-40 parts of silicon carbide fine powder, 1-3 parts of plasticizer and 1-3 parts of a lubricating agent, and the particle size of the silicon carbide coarse powder is 20-150 micrometers; the particle size of the silicon carbide fine powder is 0.2-2 micrometers. The method includes the following steps that silicon carbide coarse powder is subjected to ball-milling and shaping, and shaped silicon carbide coarse powder is obtained; the silicon carbide fine powder is subjected to wrapping treatment with a poly ethylene diamine solution, and modified silicon carbide fine powder is obtained; the modified silicon carbide fine powder and plasticizer are mixed to be uniform, the shaped silicon carbide coarse powder, water and the lubricating agent are added, kneading is conducted, and plastic silicon carbide sludge is obtained; the plastic silicon carbide sludge is squeezed, wet greens are obtained and then dried, and green bodies are obtained; the green bodies are sintered and output out of a furnace, and the recrystallized silicon carbide product is obtained. The volume density of the recrystallized silicon carbide product is 2.5-2.65 g/cm<3>, and the bending strength at the room temperature is 80-110 MPa; compared with a slip casting method, production efficiency is high, the cycle is short, the cost is low, homogeneity of the product is good, and reliability is high.

Description

technical field [0001] The invention relates to a method for preparing recrystallized silicon carbide products by a plastic method, belonging to the technical field of silicon carbide materials. Background technique [0002] Recrystallized silicon carbide products have become important high-temperature structural materials because of their high-temperature strength, good oxidation resistance and corrosion resistance, and no deformation during use. They are used in new materials, electronic technology, aerospace, chemical industry, metallurgy and other fields. gain more and more widespread application. [0003] Different from the shrinkage and densification mechanism of other ceramics during the sintering process, the sintering mechanism of recrystallized silicon carbide is evaporation-condensation, and there is no shrinkage during the sintering process, so the density of the final product depends on the particle packing density of the green body before sintering . In order...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to develop a high-efficiency preparation of recrystallized silicon carbide products by using a plastic vacuum extrusion process in view of the shortcomings of the existing recrystallized silicon carbide product grouting process, such as low production efficiency, long cycle, and high cost. method, and solve technical problems such as silicon carbide raw materials having good plasticity and high particle packing density at the same time