Silicon carbide product with high Sialon phase and preparation method thereof

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 ...

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 dissolve, resulting in a large amount of remaining Si 3 N 4 and Al 2 o 3 The sialon phase is not fully synthesized, resulting in low sialon phase content, which affects its oxidation resistance, alkali resistance and alkaline slag resistance, and molten iron erosion resistance