Silicon carbide product with high Sialon phase and preparation method thereof

A technology of silicon carbide and high sialon, applied in the field of refractory materials, can solve the problems of low sialon phase content, affecting oxidation resistance, alkali resistance and alkaline slag resistance to molten iron erosion, etc.

Active Publication Date: 2018-10-02
REFRACTORY MATERIAL OF SINOSTEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that it is difficult to precisely control the temperature, pressure and raw material activity in industrial production in the range most conducive to the formation of sialon phase, and the four elements of Si, Al, N and O are difficult to fully disso...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 30 parts of silicon carbide particles of 3-1mm, 20 parts of silicon carbide particles of 1-0.5 mm, 16 parts of silicon carbide particles of 0.5-0.2 mm, 16 parts of silicon carbide fine powder of 0.088-0.01 mm, 44 parts of -1.0 micron 9 parts of active elemental silicon powder, 6 parts of highly active α-alumina micropowder of 9-6 microns, 3 parts of highly active metal aluminum powder of 44-1.0 microns, and the amount of binder added is 4.5% of the total weight of the original material. According to XRD and DIN 12698 analysis, the content of β-Sialon phase is 22.71%, and the anti-CO performance tested by ASTM C 288 method is all up to Class A.

Embodiment 2

[0026] 30 parts of 3-1mm silicon carbide particles, 20 parts of 1-0.5 mm silicon carbide particles, 15 parts of 0.5-0.2 mm silicon carbide particles, 16 parts of 0.088-0.01 mm silicon carbide fine powder, 44-1.0 micron high 9.5 parts of active elemental silicon powder, 7 parts of 6-3 micron high-activity α-alumina powder, 2.5 parts of 44-1.0 micron high-activity metal aluminum powder, and the amount of binder added is 4.5% of the total weight of the original material. According to XRD and DIN 12698 analysis, the content of β-Sialon phase is 23.25%, and the anti-CO performance detected by ASTM C 288 method is all up to grade A.

Embodiment 3

[0028] 30 parts of 3-1mm silicon carbide particles, 20 parts of 1-0.5 mm silicon carbide particles, 15 parts of 0.5-0.2 mm silicon carbide particles, 15 parts of 0.088-0.01 mm silicon carbide fine powder, 44-1.0 microns high 10 parts of active elemental silicon powder, 7 parts of 3-0.5 micron high-activity α-alumina powder, 3 parts of 44-1.0 micron high-activity metal aluminum powder, and the amount of binder added is 4.5% of the total weight of the original material. According to XRD and DIN 12698 analysis, the content of β-Sialon phase is 26.37%, and the anti-CO performance tested by ASTM C 288 method is all up to Class A.

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PUM

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Abstract

The invention discloses a silicon carbide product with high Sialon phase and a preparation method thereof. The method comprises the following steps: premixing and grinding high-activity monatomic silicon powder, high-activity metallic aluminum powder, high-activity alpha-aluminum oxide powder and silicon carbide fine powder in a ball grinding mill for 25 to 30 minutes, so as to obtain ground powder, weighing different silicon carbide particles according to grading, the ground powder and a binding agent in proportion, mixing the mixture on a wet grinding mill for 25 to 30 minutes, pressing themixture into a blank body, and performing nitridation firing at 1450 to 1500 DEG C. The method produces the silicon carbide product with a high Sialon phase content through high-activity graded ram materials and a special technocal method, and the content of beta-Sialon phase can reach to 21 to 27 percent.

Description

technical field [0001] The invention belongs to the field of refractory materials, in particular to a kind of SiC, high-activity elemental Si powder, high-activity Al powder, high-activity α-Al 2 o 3 Micropowder is used as raw material, and nitrogen is charged during the roasting process 2 A high-sialon-phase silicon carbide article prepared by the method and a preparation method thereof. Background technique [0002] At present, in the bosh, waist and other parts of steelmaking blast furnaces, the working conditions are complex and the environment is harsh, and the refractory material used is Sialon silicon carbide, but the Sialon silicon carbide of the prior art has a relatively low Sialon phase, resulting in Oxidation resistance, alkali resistance, alkaline slag resistance, and molten iron erosion resistance are poor; in the prior art, there are many methods for preparing sialon-bonded silicon carbide, one of which is to use SiC, metal Si powder, Al powder, al 2 o 3 ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/565C04B35/622
CPCC04B35/565C04B35/622C04B35/66C04B2235/3217C04B2235/402C04B2235/428
Inventor 许大燕翟皖予范亚娟王瑞王光强
Owner REFRACTORY MATERIAL OF SINOSTEEL CORP
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