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氮化硅結(jié)合碳化硅磚是用SiC和Si粉為原料，經(jīng)氮化燒成的耐火制品。其特點(diǎn)是以Si3N4為結(jié)合相。Si3N4以針狀或纖維狀結(jié)晶存在于SiC晶粒之間，是一種重要的新型耐火材料。利用反應(yīng)燒結(jié)原理，以氮化反應(yīng)使含硅粉的SiC坯體燒結(jié)，燒成過(guò)程在通入氮?dú)?、容易控制的密閉爐內(nèi)完成。爐內(nèi)溫度、壓力、氣氛均要嚴(yán)格控制。
氮化硅結(jié)合碳化硅磚具有良好的耐堿侵蝕性、抗熔融冰晶石潤(rùn)濕性、抗氧化性、耐磨性、高導(dǎo)熱性、抗熱震性和極低的電導(dǎo)率。
氮化硅結(jié)合碳化硅磚主要用做高爐下部爐身內(nèi)襯、鋁還原電解槽內(nèi)襯、陶瓷窯具，有節(jié)能、提高壽命、不污染環(huán)境等優(yōu)點(diǎn)。
Silicon nitride bonded silicon carbide brick is a refractory product made of SiC and Si powder by nitriding and firing. Which is characterized by Si3N4 as the binding phase. Si3N4 is an important new refractory material, which exists between SiC grains in the form of needle or fiber crystals. According to the principle of reaction sintering, SiC green body containing silicon powder is sintered by nitriding reaction. The sintering process is completed in a closed furnace with nitrogen and easy control. The temperature, pressure and atmosphere in the furnace shall be strictly controlled.
Silicon nitride bonded silicon carbide brick has good alkali corrosion resistance, molten cryolite wettability, oxidation resistance, wear resistance, high thermal conductivity, thermal shock resistance and extremely low electrical conductivity.
Silicon nitride combined with silicon carbide brick is mainly used as the lining of the lower part of the blast furnace, the lining of the aluminum reduction electrolytic cell, and the ceramic kiln furniture. It has the advantages of energy saving, long service life, and no pollution to the environment.