A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Al4SiC4-SiC composite refractory material for blast furnace body and preparation method of Al4SiC4-SiC composite refractory material
The invention belongs to the field of refractory materials, and particularly relates to an Al4SiC4-SiC composite refractory product for a blast furnace body and a preparation method of the Al4SiC4-SiC composite refractory product. The product is prepared from the following raw materials in percentage by mass: 65%-90% of silicon carbide, 6%-21% of aluminum powder, 1.5%-5% of silicon powder, 2.5%-9% of carbon and 2%-5% of a binding agent. The preparation method comprises the following steps: uniformly mixing the raw materials, performing compression molding to obtain a low-carbon Al-Si-SiC composite blank, drying the low-carbon Al-Si-SiC composite blank at 120-300 DEG C, and finally sintering the low-carbon Al-Si-SiC composite blank at 1450-1800 DEG C in an argon protective atmosphere. And carrying out chemical reaction on Al, Si, C and SiC in the system at high temperature to generate an Al4SiC4 binding phase in situ, so as to obtain the Al4SiC4-SiC composite material. In order to overcome the defect that a Si3N4 binding phase in a Si3N4-SiC brick for a blast furnace in the prior art is unstable in a blast furnace ironmaking environment (for example, the Si3N4 binding phase is decomposed under the action of Fe or reacts with CO to be converted into SiC), the Al4SiC4 binding phase which is stable at a high temperature and better in performance is innovatively synthesized in situ. Under the conditions of high temperature and existence of Fe or C, Al4SiC4 has better chemical stability than Si3N4, high strength and excellent erosion resistance, and is suitable for being applied to a blast furnace ironmaking system.
本发明属于耐火材料领域，尤其涉及一种高炉本体用Al4SiC4‑SiC复合耐火制品及其制备方法。所述制品采用如下质量百分比的原料：65％～90％的碳化硅、6～21％的铝粉，1.5～5％的硅粉，2.5～9％的碳，外加2％～5％的结合剂。将上述原料混合均匀后压制成型，制得低碳Al‑Si‑SiC复合坯体并在120℃～300℃烘干，最后于氩气保护气氛下1450℃～1800℃烧成。高温下，体系中的Al、Si、C和SiC发生化学反应，原位生成Al4SiC4结合相，获得Al4SiC4‑SiC复合材料。本发明针对现有技术存在的高炉用Si3N4‑SiC砖中的Si3N4结合相在高炉炼铁环境下不稳定(如在Fe的作用下发生分解，或与CO反应转化为SiC)的不足，创新地原位合成高温稳定的、性能更优的Al4SiC4结合相。在高温、Fe或C存在条件下，Al4SiC4具有比Si3N4优越的化学稳定性，强度高、抗侵蚀性优异，适宜应用于高炉炼铁体系。
Al4SiC4-SiC composite refractory material for blast furnace body and preparation method of Al4SiC4-SiC composite refractory material
The invention belongs to the field of refractory materials, and particularly relates to an Al4SiC4-SiC composite refractory product for a blast furnace body and a preparation method of the Al4SiC4-SiC composite refractory product. The product is prepared from the following raw materials in percentage by mass: 65%-90% of silicon carbide, 6%-21% of aluminum powder, 1.5%-5% of silicon powder, 2.5%-9% of carbon and 2%-5% of a binding agent. The preparation method comprises the following steps: uniformly mixing the raw materials, performing compression molding to obtain a low-carbon Al-Si-SiC composite blank, drying the low-carbon Al-Si-SiC composite blank at 120-300 DEG C, and finally sintering the low-carbon Al-Si-SiC composite blank at 1450-1800 DEG C in an argon protective atmosphere. And carrying out chemical reaction on Al, Si, C and SiC in the system at high temperature to generate an Al4SiC4 binding phase in situ, so as to obtain the Al4SiC4-SiC composite material. In order to overcome the defect that a Si3N4 binding phase in a Si3N4-SiC brick for a blast furnace in the prior art is unstable in a blast furnace ironmaking environment (for example, the Si3N4 binding phase is decomposed under the action of Fe or reacts with CO to be converted into SiC), the Al4SiC4 binding phase which is stable at a high temperature and better in performance is innovatively synthesized in situ. Under the conditions of high temperature and existence of Fe or C, Al4SiC4 has better chemical stability than Si3N4, high strength and excellent erosion resistance, and is suitable for being applied to a blast furnace ironmaking system.
本发明属于耐火材料领域，尤其涉及一种高炉本体用Al4SiC4‑SiC复合耐火制品及其制备方法。所述制品采用如下质量百分比的原料：65％～90％的碳化硅、6～21％的铝粉，1.5～5％的硅粉，2.5～9％的碳，外加2％～5％的结合剂。将上述原料混合均匀后压制成型，制得低碳Al‑Si‑SiC复合坯体并在120℃～300℃烘干，最后于氩气保护气氛下1450℃～1800℃烧成。高温下，体系中的Al、Si、C和SiC发生化学反应，原位生成Al4SiC4结合相，获得Al4SiC4‑SiC复合材料。本发明针对现有技术存在的高炉用Si3N4‑SiC砖中的Si3N4结合相在高炉炼铁环境下不稳定(如在Fe的作用下发生分解，或与CO反应转化为SiC)的不足，创新地原位合成高温稳定的、性能更优的Al4SiC4结合相。在高温、Fe或C存在条件下，Al4SiC4具有比Si3N4优越的化学稳定性，强度高、抗侵蚀性优异，适宜应用于高炉炼铁体系。
Al4SiC4-SiC composite refractory material for blast furnace body and preparation method of Al4SiC4-SiC composite refractory material
一种高炉本体用Al4SiC4-SiC复合耐火材料及其制备方法
LI YONG (author) / MA CHENHONG (author) / YUE XI (author) / HAN GI-SEOK (author)
2022-04-15
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
Al4SiC4 COMPOSITION OR Al4SiC4 POWDER, AND METHOD OF PRODUCING THE SAME
| European Patent Office | 2022