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A β-sialon/al 2 o 3 Composite powder and its preparation method

A technology of composite powder and silicon powder, which is applied in the field of β-Sialon/Al2O3 composite powder and its preparation, can solve the problems of high synthesis temperature and many impurities in the product, and achieves low synthesis temperature, high product purity and simple process. Effect

Inactive Publication Date: 2016-06-08
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical defect of this method is that the synthetic temperature is high and the product impurity is more

Method used

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  • A β-sialon/al <sub>2</sub> o <sub>3</sub> Composite powder and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A β-Sialon / Al 2 o 3 Composite powder and its preparation method. 40-45wt% of alumina powder, 35-40wt% of silicon powder and 15-20wt% of aluminum powder are used as raw materials, and 0.1-1.0wt% of iron is added to obtain the mixture.

[0028] The mixture is placed in a corundum ball mill jar, and then the mass ratio of corundum balls:mixture:ethanol is 2~3:1:0.5~1.5, and corundum balls and ethanol are added to the corundum ball mill jar, and ball milled for 2 ~4 hours. Then dry at 110°C for 16-36 hours, and then calcined at 1200-1300°C and nitrogen atmosphere for 4-6 hours to obtain β-Sialon / Al 2 o 3 Composite powder.

[0029] The β-Sialon / Al prepared in this embodiment 2 o 3 Composite powder, after testing: the total content of β-Sialon and alumina composite powder is 97~99wt%; among them, the content of β-Sialon powder is 53~57wt%.

Embodiment 2

[0031] A β-Sialon / Al 2 o 3 Composite powder and its preparation method. The mixture is obtained by using 40-45wt% alumina powder, 35-40wt% silicon powder and 15-20wt% aluminum powder as raw materials, plus 1.0-2.0wt% cobalt.

[0032] The mixture is placed in a corundum ball mill jar, and then the mass ratio of corundum balls:mixture:ethanol is 2~3:1:0.5~1.5, and corundum balls and ethanol are added to the corundum ball mill jar, and ball milled for 2 ~4 hours. Then dry at 110°C for 16-36 hours, and then calcined at 1150-1250°C and nitrogen atmosphere for 3-5 hours to obtain β-Sialon / Al 2 o 3 Composite powder.

[0033] The β-Sialon / Al prepared in this embodiment 2 o 3 Composite powder, after testing: the total content of β-Sialon and alumina composite powder is 98~99wt%; among them, the content of β-Sialon powder is 56~59wt%.

Embodiment 3

[0035] A β-Sialon / Al 2 o 3 Composite powder and its preparation method. The mixture is obtained by using 40-45wt% of alumina powder, 35-40wt% of silicon powder and 15-20wt% of aluminum powder as raw materials, plus 2.0-3.5wt% of nickel.

[0036]The mixture is placed in a corundum ball mill jar, and then the mass ratio of corundum balls:mixture:ethanol is 2~3:1:0.5~1.5, and corundum balls and ethanol are added to the corundum ball mill jar, and ball milled for 2 ~4 hours. Then dry at 110°C for 16-36 hours, and then calcined at 1100-1200°C and nitrogen atmosphere for 2-4 hours to obtain β-Sialon / Al 2 o 3 Composite powder.

[0037] The β-Sialon / Al prepared in this embodiment 2 o 3 Composite powder, after testing: the total content of β-Sialon and alumina composite powder is 98~99wt%; among them, the content of β-Sialon powder is 60~64wt%.

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Abstract

The present invention relates to a kind of β-Sialon / Al 2 o 3 Composite powder and its preparation method. The technical solution is: use 40-50wt% of alumina powder, 35-45wt% of silicon powder and 10-20wt% of aluminum powder as raw materials, and add transition metals accounting for 0.1-3.5wt% of raw materials to obtain a mixture. The mixture is placed in a corundum ball mill jar, and then the mass ratio of corundum balls:mixture:ethanol is 2~3:1:0.5~1.5, and corundum balls and ethanol are added to the corundum ball mill jar, and ball milled for 2 ~4 hours. Then dry at 110°C for 16-36 hours, and then calcined at 1100-1300°C and nitrogen atmosphere for 2-6 hours to obtain β-Sialon / Al 2 o 3 Composite powder. The invention has the characteristics of low synthesis temperature, simple process and high product purity.

Description

technical field [0001] The invention belongs to the technical field of composite powder. In particular a β-Sialon / Al 2 o 3 Composite powder and its preparation method. Background technique [0002] β-Sialon is a solid solution with the best oxidation resistance, high temperature resistance and thermal stability in the Sialon series, and its linear expansion coefficient [2~3×10 -6 (1 / ℃)] slightly lower than β-Si 3 N 4 , while the thermal conductivity is higher than that of β-Si 3 N 4 It is much lower and has excellent thermal shock resistance; β-Sialon also has excellent resistance to molten iron and slag erosion, good mechanical strength and hardness. Therefore, β-Sialon materials have been widely used in industrial fields. [0003] The commonly used industrial synthesis method for β-Sialon materials is to use high-purity Si 3 N 4 、A1 2 o 3 , AlN and SiO 2 The raw material is synthesized by a high-temperature solid-phase method, but the expensive raw material in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/599C04B35/622
Inventor 李享成邓兴朱伯铨
Owner WUHAN UNIV OF SCI & TECH
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