阅读说明：本技术 一种防氧化碳化硅窑具的制备方法 (Preparation method of anti-oxidation silicon carbide kiln furniture ) 是由 王刚 张伟 刘鹏程 张涛 石书冰 于 2020-08-13 设计创作，主要内容包括：本发明属于耐火材料领域,具体涉及一种防氧化碳化硅窑具及制备方法。所述防氧化碳化硅窑具的制备方法就是在传统碳化硅窑具坯体表面再压制一层防氧化材料,防氧化材料是由50-80份的金属硅粉、10-30份的锆英石粉和10-20份的熔融石英粉组成。本发明制得的防氧化碳化硅窑具具有抗氧化能力强,表层防氧化材料与碳化硅基体不易开裂以及碳化硅窑具使用寿命长的性能优点。(The invention belongs to the field of refractory materials, and particularly relates to anti-oxidation silicon carbide kiln furniture and a preparation method thereof. The preparation method of the anti-oxidation silicon carbide kiln furniture is characterized in that a layer of anti-oxidation material is pressed on the surface of a traditional silicon carbide kiln furniture blank, and the anti-oxidation material consists of 50-80 parts of metal silicon powder, 10-30 parts of zircon powder and 10-20 parts of fused quartz powder. The anti-oxidation silicon carbide kiln furniture prepared by the invention has the performance advantages of strong anti-oxidation capability, difficult cracking of the anti-oxidation material on the surface layer and the silicon carbide substrate, and long service life.)

1. A preparation method of anti-oxidation silicon carbide kiln furniture is characterized by comprising the following steps: the preparation method of the silicon carbide kiln furniture comprises the steps of pressing a layer of anti-oxidation material on the surface of a silicon carbide kiln furniture blank; the anti-oxidation material consists of 50-80 parts of metal silicon powder, 10-30 parts of zircon powder and 10-20 parts of fused quartz powder; the preparation method comprises the following steps: firstly, uniformly spreading the mixed anti-oxidation material powder on the surface of the silicon carbide kiln furniture raw material, and slightly pressing to ensure that the anti-oxidation powder and the silicon carbide raw material are combined to a certain extent; then pressing according to the forming pressure and mode of the silicon carbide kiln furniture, and finally sintering the pressed blank body according to the drying and sintering mode of the silicon carbide kiln furniture to obtain the anti-oxidation silicon carbide kiln furniture.

2. The method for preparing oxidation-resistant silicon carbide kiln furniture as claimed in claim 1, wherein: the granularity of the metal silicon powder is less than or equal to 0.1mm, the granularity of the zircon powder is less than or equal to 0.088mm, and the granularity of the fused quartz powder is less than or equal to 0.088 mm.

Technical Field

The invention belongs to the technical field of refractory materials, and particularly relates to a preparation method of anti-oxidation silicon carbide kiln furniture.

Technical Field

The silicon carbide material has excellent high-temperature mechanical property, is an important kiln furniture material and is widely applied to industries such as high-temperature ceramics, refractory materials, nonferrous metallurgy and the like; however, when the silicon carbide kiln furniture product is used at a high temperature for a long time, silicon carbide is easily oxidized to generate a silicon dioxide glass phase or a low-melting silicate substance, so that the silicon carbide kiln furniture is expanded, deformed and peeled on the surface, the strength, the thermal shock resistance and the service life of the kiln furniture are reduced, and therefore, the improvement of the oxidation resistance of the silicon carbide kiln furniture product becomes a key point for the research of the silicon carbide kiln furniture industry.

Many reports have been made on the research on the oxidation resistance of silicon carbide materials; the invention relates to a preparation method of silicon carbide ceramic kiln furniture with yttrium-stabilized zirconia coating coated on the surface (application number 201510762902.3). Yttrium-stabilized zirconia sol is coated on the surface of a silicon carbide ceramic kiln furniture blank, and then the silicon carbide ceramic kiln furniture blank is fired together to form a yttrium-stabilized zirconia coating on the surface of the silicon carbide ceramic kiln furniture; the zirconium dioxide coating has good thermal stability, but the zirconium sol is adopted to form the coating in the firing process, so that the coating cracks and falls off due to large shrinkage in the sintering process of the coating on one hand, and on the other hand, the zirconium dioxide is difficult to combine with the silicon carbide material and the difference of the thermal expansion coefficients of the zirconium dioxide and the silicon carbide material also influences the combination and use effects of the coating; the invention relates to a silicon carbide surface oxidation resistant white coating material and a preparation method thereof (application No. 201811477839.9). Dicalophyllum phosphate and zircon powder are mixed together to prepare slurry, and the slurry is coated on the silicon carbide surface by adopting a brush coating or blade coating method to prepare the silicon carbide oxidation resistant white coating material. But the fired silicon carbide product has higher density and is not easy to cause permeation and combination reaction of other oxide materials, so that the coating on the surface of the product is difficult to ensure that the silicon carbide product and the product are tightly combined by brushing, the oxidation resistance and the service life of the coating are not ideal, and the cracking and peeling of the coating are inevitable; therefore, the developed anti-oxidation silicon carbide kiln furniture material which is not easy to crack and has long service life has higher application value.

Disclosure of Invention

The invention aims to provide a preparation method of anti-oxidation silicon carbide kiln furniture, which has the characteristics of strong oxidation resistance, difficult cracking and long service life.

The purpose of the invention is realized by the following technical scheme:

a preparation method of anti-oxidation silicon carbide kiln furniture, the preparation method of the silicon carbide kiln furniture is to press a layer of anti-oxidation material on the surface of a silicon carbide kiln furniture blank; the anti-oxidation material consists of 50-80 parts of metal silicon powder, 10-30 parts of zircon powder and 10-20 parts of fused quartz powder; the preparation method comprises the following steps: firstly, uniformly spreading the mixed anti-oxidation material powder on the surface of the silicon carbide kiln furniture raw material, and slightly pressing to ensure that the anti-oxidation powder and the silicon carbide raw material are combined to a certain extent; then pressing according to the forming pressure and mode of the silicon carbide kiln furniture, and finally sintering the pressed blank body according to the drying and sintering mode of the silicon carbide kiln furniture to obtain the anti-oxidation silicon carbide kiln furniture.

The granularity of the metal silicon powder is less than or equal to 0.1mm, the granularity of the zircon powder is less than or equal to 0.088mm, and the granularity of the fused quartz powder is less than or equal to 0.088 mm.

The invention provides a preparation method of an anti-oxidation silicon carbide kiln, which is realized by pressing a layer of anti-oxidation material tightly combined with silicon carbide kiln furniture on the surface of the silicon carbide kiln furniture; the silicon carbide kiln furniture is fired at high temperature in a nitrogen atmosphere, the metal silicon is nitrided to form silicon nitride under the condition, the silicon nitride and silicon carbide combined material is formed on the surface of the silicon carbide kiln furniture, the combination strength can be improved, and the thermal expansion coefficients of the silicon carbide kiln furniture and the silicon carbide combined material are close to each other and are not easy to crack; in addition, the oxidation resistance of the silicon nitride material is superior to that of the silicon carbide material, so that the oxidation resistance of the silicon carbide material can be improved; the zircon powder and the fused quartz powder are used as raw materials, so that the material can be sintered more compactly at high temperature, and the penetration of oxygen is prevented, thereby improving the oxidation resistance of the silicon carbide kiln furniture.

The silicon carbide kiln furniture surface coating has the beneficial effects that:

1) the oxidation resistance is strong. The silicon nitride material has higher high temperature resistance and oxidation resistance than the silicon carbide material, and the fused quartz is easy to change phase and sinter at high temperature, so that the density of the surface layer material can improve the resistance to oxygen.

2) The surface layer anti-oxidation material and the silicon carbide substrate have strong binding force. The method for pressing, forming and firing the anti-oxidation material and the silicon carbide kiln furniture blank together has stronger binding force than the traditional method for coating a layer of anti-oxidation coating on the surface of the silicon carbide kiln furniture, and the anti-oxidation material and the silicon carbide kiln furniture blank are mutually permeated and fused into a whole in the firing process, so that the silicon carbide kiln furniture blank is not cracked.

3) The silicon carbide kiln furniture has long service life. The silicon carbide kiln furniture is not easy to be oxidized, the surface layer has high density and is not easy to fall off, and the service life of the silicon carbide kiln furniture can be effectively prolonged.

Detailed Description

The invention is illustrated with reference to the examples given: