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Method for preparing beta-SiALON (compound word of Si, AL, O and N)

A high-temperature firing and wet material technology, applied in the field of synthesis, can solve the problems of resin odor and environmental pollution, and achieve the effect of reducing costs and pollution

Inactive Publication Date: 2013-09-04
成都府天高温材料科技有限公司
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AI Technical Summary

Problems solved by technology

However, the burning of resin will stink and pollute the environment

Method used

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Experimental program
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Embodiment 1

[0018] ⑴Raw material selection: Choose low-grade raw materials with sufficient resources in Henan and other places: coke, 60 bauxite as aluminum source; choose clay (SiO 2 content ≥ 45%) as the silicon source; use anthracite with sufficient resources as the carbon source (about 1800 yuan / ton);

[0019] ⑵ co-grind coke gangue, 60 bauxite, clay, and anthracite in a ratio of 1:1:0.5:1 in a barrel mill. During the grinding process of raw materials, the specific surface area, mixing uniformity, and surface activity of raw materials are increased. ; After grinding, add water to make the powder into a wet material.

[0020] ⑶Apply the wet material on the mold, the mold can be selected according to the customer's requirements, and the wet material will naturally form a product with a porosity of about 60% after drying on the mold. This step is conducive to the subsequent nitriding and firing reaction. The clay is not only a raw material but also a binder, and it adopts a smear moldin...

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Abstract

The invention discloses a method for preparing beta-SiALON (compound word of Si, AL, O and N) and relates to a synthetic method. The synthetic method comprises the following steps of: (1) grinding materials: taking coked muck, 60 alumina, clay and blind coal as raw materials, carrying out common grinding in a barrel mill, so as to prepare mixed powder; (2) preparing wet materials: adding water into the mixed powder to prepare the wet materials; (3) carrying out smearing forming: smearing the wet materials on a die, and naturally forming a product with the porosity approximate to 60% after the wet materials are dried on the die; and (4) sintering the beta-SiALON by utilizing a nitriding furnace: sending the product prepared in the step (3) into the nitriding furnace, sequentially carrying out lower-temperate sintering and high-temperate sintering in order under a closed nitrogen protection condition, so as to obtain the beta-SiALON. Compared with the prior art, the method disclosed by the invention has the advantages that the conversion rate can reach above 80%, the cost is controlled within ** yuan / ton, and meanwhile, the pollution is reduced.

Description

technical field [0001] The invention relates to a synthesis method, in particular to a method for preparing β-SiALON. Background technique [0002] At present, silicon nitride and sialon products used in blast furnace iron hooks, gun mud, and ladle bricks in steelmaking plants generally use relatively pure industrial alumina, metal silicon, and carbon black as raw materials, which are costly and expensive in the market (currently about 30,000 yuan / ton); [0003] In the production process, most of them use resin as binder and extrusion molding. During the firing process, the resin burns and volatilizes to form pores. However, burning resin will stink and pollute the environment. Contents of the invention [0004] The purpose of the present invention is to provide a method for preparing β-SiALON, the conversion rate of the method for preparing β-SiALON can reach more than 80%, the cost is controlled within 8000 yuan / ton, and the pollution is reduced. [0005] The technic...

Claims

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Application Information

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IPC IPC(8): C04B35/599C04B35/622
Inventor 蓝亭胡永波樊能仲詹家林王立峰
Owner 成都府天高温材料科技有限公司
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