Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation method of mullite whisker coated silicon carbide refractory material generated by in-situ reaction
The invention discloses a preparation method of a mullite whisker coated silicon carbide refractory material generated by an in-situ reaction. The preparation method comprises the following steps of carrying out ball grinding and premixing on a catalyst, alumina powder, high bauxite powder, soft clay and dry dextrin, adding water, and stirring to form slurry, putting the slurry, the sintered mullite granules and the silicon carbide granules into a planetary forced mixer for stirring, so that the slurry uniformly wraps the surfaces of the granules, and ventilating and drying, putting the dried particle wrapping material into a mixing machine, adding silica sol, stirring, adding silicon carbide powder, fine sillimanite and metal silicon powder into the mixing machine, mixing and grinding, ageing the mixed raw materials, and carrying out mechanical pressing molding, and sintering at high temperature to obtain a finished product. Growth of mullite crystals is influenced by means of adding the catalyst, so that crystal nucleuses of the mullite crystals rapidly grow along the C axis through gas-solid reaction to form mullite whiskers, and the mechanical properties of the mullite combined silicon carbide material are remarkably improved through action mechanisms such as whisker extraction, whisker bridging and crack deflection of the mullite whiskers.
本发明公开了一种原位反应生成莫来石晶须包裹碳化硅耐火材料的制备方法，包括以下步骤：将催化剂、氧化铝粉、高铝矾土粉、软质粘土、干糊精球粉磨预混后加水搅拌形成泥浆；将泥浆、烧结莫来石颗粒料和碳化硅颗粒料放入行星式强制混合机中搅拌，使泥浆均匀包裹在颗粒料的表面，通风干燥；干燥后的颗粒包裹料放入混合机中加入硅溶胶搅拌，把碳化硅粉、细硅线石、金属硅粉加入混合机中进行混碾，混好的原料困料后机压成型；高温烧成得成品。本发明通过加入催化剂的手段影响莫来石晶体的生长，使其晶核通过气固反应而沿C轴快速生长，形成莫来石晶须，莫来石晶须通过晶须拔出、晶须桥联、裂纹偏转等作用机制显著提高莫来石结合碳化硅材料的力学性能。
Preparation method of mullite whisker coated silicon carbide refractory material generated by in-situ reaction
The invention discloses a preparation method of a mullite whisker coated silicon carbide refractory material generated by an in-situ reaction. The preparation method comprises the following steps of carrying out ball grinding and premixing on a catalyst, alumina powder, high bauxite powder, soft clay and dry dextrin, adding water, and stirring to form slurry, putting the slurry, the sintered mullite granules and the silicon carbide granules into a planetary forced mixer for stirring, so that the slurry uniformly wraps the surfaces of the granules, and ventilating and drying, putting the dried particle wrapping material into a mixing machine, adding silica sol, stirring, adding silicon carbide powder, fine sillimanite and metal silicon powder into the mixing machine, mixing and grinding, ageing the mixed raw materials, and carrying out mechanical pressing molding, and sintering at high temperature to obtain a finished product. Growth of mullite crystals is influenced by means of adding the catalyst, so that crystal nucleuses of the mullite crystals rapidly grow along the C axis through gas-solid reaction to form mullite whiskers, and the mechanical properties of the mullite combined silicon carbide material are remarkably improved through action mechanisms such as whisker extraction, whisker bridging and crack deflection of the mullite whiskers.
本发明公开了一种原位反应生成莫来石晶须包裹碳化硅耐火材料的制备方法，包括以下步骤：将催化剂、氧化铝粉、高铝矾土粉、软质粘土、干糊精球粉磨预混后加水搅拌形成泥浆；将泥浆、烧结莫来石颗粒料和碳化硅颗粒料放入行星式强制混合机中搅拌，使泥浆均匀包裹在颗粒料的表面，通风干燥；干燥后的颗粒包裹料放入混合机中加入硅溶胶搅拌，把碳化硅粉、细硅线石、金属硅粉加入混合机中进行混碾，混好的原料困料后机压成型；高温烧成得成品。本发明通过加入催化剂的手段影响莫来石晶体的生长，使其晶核通过气固反应而沿C轴快速生长，形成莫来石晶须，莫来石晶须通过晶须拔出、晶须桥联、裂纹偏转等作用机制显著提高莫来石结合碳化硅材料的力学性能。
Preparation method of mullite whisker coated silicon carbide refractory material generated by in-situ reaction
一种原位反应生成莫来石晶须包裹碳化硅耐火材料的制备方法
DONG LIANGJUN (Autor:in) / CHENG PINGPING (Autor:in) / SANG SHAOBAI (Autor:in) / CHENG QIAN (Autor:in) / SHI HANG (Autor:in)
21.12.2021
Patent
Elektronische Ressource
Chinesisch
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