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AlN-SiC solid solution combined SiC composite refractory material for side wall of aluminum electrolysis cell and preparation method
The invention belongs to the field of refractory materials, and particularly relates to an AlN-SiC solid solution combined SiC composite refractory material for an aluminum electrolysis cell side wall and a preparation method of the AlN-SiC solid solution combined SiC composite refractory material. The AlN-SiC solid solution combined SiC composite refractory material is prepared from the following raw materials: 65 to 90 weight percent of silicon carbide, 5 to 20 weight percent of aluminum powder, 5 to 10 weight percent of silicon powder, 0 to 5 weight percent of carbon powder and 2 to 5 weight percent of binding agent. The preparation method comprises the following steps: uniformly mixing the raw materials with a binding agent, carrying out compression molding, drying to obtain a low-carbon Al-Si-SiC composite green body, and sintering the low-carbon Al-Si-SiC composite green body at 1450-2000 DEG C in a carbon burying atmosphere to obtain the AlN-SiC solid solution combined SiC composite refractory material. In order to solve the problems that in the prior art, a Si3N4 binding phase in a Si3N4-SiC composite material for the aluminum electrolysis cell is prone to reacting with Al liquid, cryolite and the like in the service process, the material structure is damaged, and the use performance is greatly reduced, metal Al is innovatively further introduced into a Si-SiC composite system, and the service life of the material is greatly prolonged. An AlN-SiC solid solution binding phase with higher chemical stability and better comprehensive performance is synthesized in situ at high temperature, and the novel AlN-SiC solid solution binding SiC composite refractory material is prepared.
本发明属于耐火材料领域，尤其涉及一种铝电解槽侧墙用AlN‑SiC固溶体结合SiC复合耐火材料及其制备方法。所述AlN‑SiC固溶体结合SiC复合耐火材料包括如下原料组成：65～90wt％的碳化硅、5～20wt％的铝粉、5～10wt％的硅粉、0～5wt％的碳粉，外加2～5wt％的结合剂。将上述原料与结合剂混合均匀后压制成型并干燥，得到低碳Al‑Si‑SiC复合坯体，于1450℃～2000℃埋碳气氛下烧成，制得AlN‑SiC固溶体结合SiC复合耐火材料。本发明针对现有技术中铝电解槽用Si3N4‑SiC复合材料中的Si3N4结合相在服役过程中易与Al液、冰晶石等发生反应，导致材料结构破坏、使用性能大大降低，创新地在Si‑SiC复合体系中进一步引入金属Al，并在高温下原位合成化学稳定性更高、综合性能更优的AlN‑SiC固溶体结合相，制备新型AlN‑SiC固溶体结合SiC复合耐火材料。
AlN-SiC solid solution combined SiC composite refractory material for side wall of aluminum electrolysis cell and preparation method
The invention belongs to the field of refractory materials, and particularly relates to an AlN-SiC solid solution combined SiC composite refractory material for an aluminum electrolysis cell side wall and a preparation method of the AlN-SiC solid solution combined SiC composite refractory material. The AlN-SiC solid solution combined SiC composite refractory material is prepared from the following raw materials: 65 to 90 weight percent of silicon carbide, 5 to 20 weight percent of aluminum powder, 5 to 10 weight percent of silicon powder, 0 to 5 weight percent of carbon powder and 2 to 5 weight percent of binding agent. The preparation method comprises the following steps: uniformly mixing the raw materials with a binding agent, carrying out compression molding, drying to obtain a low-carbon Al-Si-SiC composite green body, and sintering the low-carbon Al-Si-SiC composite green body at 1450-2000 DEG C in a carbon burying atmosphere to obtain the AlN-SiC solid solution combined SiC composite refractory material. In order to solve the problems that in the prior art, a Si3N4 binding phase in a Si3N4-SiC composite material for the aluminum electrolysis cell is prone to reacting with Al liquid, cryolite and the like in the service process, the material structure is damaged, and the use performance is greatly reduced, metal Al is innovatively further introduced into a Si-SiC composite system, and the service life of the material is greatly prolonged. An AlN-SiC solid solution binding phase with higher chemical stability and better comprehensive performance is synthesized in situ at high temperature, and the novel AlN-SiC solid solution binding SiC composite refractory material is prepared.
本发明属于耐火材料领域，尤其涉及一种铝电解槽侧墙用AlN‑SiC固溶体结合SiC复合耐火材料及其制备方法。所述AlN‑SiC固溶体结合SiC复合耐火材料包括如下原料组成：65～90wt％的碳化硅、5～20wt％的铝粉、5～10wt％的硅粉、0～5wt％的碳粉，外加2～5wt％的结合剂。将上述原料与结合剂混合均匀后压制成型并干燥，得到低碳Al‑Si‑SiC复合坯体，于1450℃～2000℃埋碳气氛下烧成，制得AlN‑SiC固溶体结合SiC复合耐火材料。本发明针对现有技术中铝电解槽用Si3N4‑SiC复合材料中的Si3N4结合相在服役过程中易与Al液、冰晶石等发生反应，导致材料结构破坏、使用性能大大降低，创新地在Si‑SiC复合体系中进一步引入金属Al，并在高温下原位合成化学稳定性更高、综合性能更优的AlN‑SiC固溶体结合相，制备新型AlN‑SiC固溶体结合SiC复合耐火材料。
AlN-SiC solid solution combined SiC composite refractory material for side wall of aluminum electrolysis cell and preparation method
铝电解槽侧墙用AlN-SiC固溶体结合SiC复合耐火材料及制备方法
LI YONG (author) / MA CHENHONG (author) / YUE XI (author) / HAN GI-SEOK (author)
2022-03-08
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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