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Preparation method of silicon carbide ceramic composite product

A technology of silicon carbide ceramics and composite products, which is applied in the field of refractory material preparation, can solve problems such as the difficulty in realizing machine-pressed forming, endangering product performance, and hindering machine-pressed forming, so as to reduce production costs, increase production efficiency, and prevent carbon residues the effect of existence

Active Publication Date: 2021-06-15
SINOSTEEL LUOYANG INST OF REFRACTORIES RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this patent, the silicon carbide powder is finer (40-120 mesh silicon carbide powder), and the components contain carbon powder, which makes it difficult to realize machine-pressed molding; in addition, carbon powder is a harmful component that hinders machine-pressed molding, and in It is difficult to completely react during high-temperature sintering, and a small amount of carbon residue will significantly damage the performance of the product

Method used

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  • Preparation method of silicon carbide ceramic composite product
  • Preparation method of silicon carbide ceramic composite product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 3000g of silicon carbide particles with a particle diameter greater than 0.088mm and less than or equal to 3mm, 2000g of silicon carbide particles with a particle diameter of less than or equal to 0.088mm, 2000g of silicon carbide micropowder with a median diameter of 3.5µm, and granulate silicon carbide particles with a median diameter of 30µm. Powder 3000g, silicon powder 1050g with a particle size less than or equal to 0.1mm, put into a high-speed mixer and pre-mix evenly; add 1500g of phenolic resin with a carbon content of 30%, and mix a uniform mud; press it into a 230× 114×65mm block; drying; sintering at 2450°C for 3 hours in an ultra-high temperature silicon carbide sintering furnace. That is to obtain high-purity silicon carbide composite ceramic products, the silicon carbide content of which is 99.13%.

Embodiment 2

[0023] Weigh 4000g of silicon carbide particles with a particle diameter greater than 0.088mm and less than or equal to 3mm, 1000g of silicon carbide particles with a particle diameter of less than or equal to 0.088mm, 2000g of silicon carbide micropowder with a median diameter of 2.5µm, and granulate silicon carbide particles with a median diameter of 30µm. Powder 3000g, silicon powder 1050g with a particle size less than or equal to 0.1mm, put it into a high-speed mixer and pre-mix it evenly; add 1500g of phenolic resin with a carbon content of 50%, and mix it into a uniform mud; press it into a 230× 114×65mm block; drying; sintering at 2350°C for 3h in an ultra-high temperature silicon carbide sintering furnace. That is to obtain high-purity silicon carbide composite ceramic products with a silicon carbide content of 99.24%.

Embodiment 3

[0025] Weigh 4000g of silicon carbide particles with a particle diameter greater than 0.88mm and less than or equal to 3mm, 2000g of silicon carbide particles with a particle diameter of less than or equal to 0.088mm, 1500g of silicon carbide micropowder with a median diameter of 3.5µm, and granulate silicon carbide particles with a median diameter of 30µm. Powder 2500g, silicon powder 840g with particle size less than or equal to 0.1mm, put it into a high-speed mixer and pre-mix it evenly; add 1200g of phenolic resin with a carbon content of 30%, and mix it into a uniform mud; press it into a 230× 114×65mm block; drying; sintering at 2300°C for 6h in an ultra-high temperature silicon carbide sintering furnace. That is to obtain high-purity silicon carbide composite ceramic products, the silicon carbide content of which is 99.06%.

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Abstract

The invention belongs to the field of preparation of refractory materials, and particularly relates to a preparation method of a silicon carbide ceramic composite product. The method comprises the following steps: by taking high-purity silicon carbide particles, granulated silicon carbide and silicon carbide micro powder as main raw materials, adding a small amount of silicon powder, adding an organic binding agent, fully and uniformly mixing, and sintering for 2-10 hours at the temperature of 2200-2500 DEG C in a protective atmosphere by adopting a semi-dry method. According to the method, semi-dry forming is achieved, compared with wet forming, the method is short in forming period and high in efficiency, the maximum size of a green body can exceed 350 mm, a product is uniform in microstructure and excellent in performance, the production cost is reduced, and the method is a major breakthrough of a recrystallized silicon carbide material preparation technology.

Description

technical field [0001] The invention belongs to the technical field of refractory material preparation, and mainly relates to a method for preparing a silicon carbide ceramic composite product. Background technique [0002] Silicon carbide is a strong covalent bond compound, which has the advantages of high mechanical strength, high thermal conductivity, small expansion coefficient, good wear resistance, strong chemical corrosion resistance, and excellent thermal shock resistance; there are many types of silicon carbide products, and the development speed Fast; successively experienced silicate-bonded silicon carbide products, nitride-bonded silicon carbide products to self-bonded silicon carbide with more advanced performance; silicon carbide products are generally formed by semi-dry methods, such as machine pressing, isostatic pressing, etc. High molding efficiency, suitable for large-scale industrial applications. Silicon carbide products are widely used in non-ferrous m...

Claims

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Application Information

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IPC IPC(8): C04B35/567C04B35/65
CPCC04B35/565C04B35/66C04B35/573C04B2235/428C04B2235/48C04B2235/96C04B2235/77
Inventor 万龙刚王建波李杰李红霞郑翰王文武曹会彦袁波石会营
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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