本文選題：鋁礬土　切入點(diǎn)：鋯英石　出處：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：針對(duì)開發(fā)利用中低品位鋁礬土等耐火資源和新型低碳非氧化物復(fù)相耐火材料的性能優(yōu)化等問題,本文利用中低品位鋁礬土和鋯英石制備ZrN-SiAlON等復(fù)相耐火粉體,并以蔗糖為結(jié)合劑,結(jié)合SiC粉體,制備含碳耐火材料,研究其力學(xué)性能、抗氧化性能和抗渣侵性能,取得一些重要研究成果。分析中低品位鋁礬土和鋯英石通過碳熱/鋁熱還原氮化法合成ZrN-SiAlON耐火原料的物相行為,獲得優(yōu)化的工藝參數(shù)。采用焦炭作為還原劑時(shí),中低品位鋁礬土和鋯英石在1600°C合成較純的ZrN-SiAlON物相。以ZrN-SiAlON耐火粉體為基質(zhì),以蔗糖溶液為結(jié)合劑,結(jié)合SiC粉體制備ZrN-SiAlON-SiC-C復(fù)相非氧化物耐火材料。經(jīng)1500°C熱處理后,ZrN-SiAlON耐火粉體受到蔗糖熱分解的影響,物相變化生成ZrO2、剛玉和石英,導(dǎo)致體積發(fā)生膨脹,顯氣孔率變大,體積密度減少,當(dāng)ZrN-SiAlON耐火粉體添加量為40wt.%時(shí),其顯氣孔率達(dá)到最大,體積密度達(dá)到最低,常溫抗折強(qiáng)度達(dá)到最大,分別為53.23%,1.36g/cm3,4.39MPa,但ZrO2、剛玉和石英的含量升高,有助于提高ZrN-SiAlON-SiC-C復(fù)相耐火材料的抗折強(qiáng)度。通過研究ZrN-SiAlON-SiC-C復(fù)相耐火材料的氧化行為變化,結(jié)果表明該材料在氧化過程中質(zhì)量變化主要受到不定形碳和SiC粉體的氧化。另外,當(dāng)氧化溫度為1200°C時(shí)ZrO2和方石英反應(yīng)生成鋯英石,當(dāng)氧化溫度為1400°C時(shí),剛玉和方石英生成莫來石。通過研究氣氛環(huán)境對(duì)ZrN-SiAlON-SiC-C復(fù)相耐火材料抗渣侵性能的影響,結(jié)果表明,在氧氣氛圍,該耐火材料氧化嚴(yán)重,造成孔隙變大,渣侵蝕嚴(yán)重。在氬氣氛圍,高爐渣滲透到耐火材料中,并溶解耐火材料,然后不斷滲透,填充耐火材料孔隙,形成致密層。在還原氛圍,高爐渣對(duì)耐火材料的潤濕角變大,沒有發(fā)生侵蝕現(xiàn)象。
[Abstract]:Aiming at the problems of developing and utilizing refractory resources such as medium and low grade bauxite and new low carbon non-oxide composite refractories, this paper prepared ZrN-SiAlON and other multiphase refractory powders with sucrose as binder, using medium and low grade bauxite and zircon as binder.Carbon-containing refractories were prepared with SiC powder, and their mechanical properties, oxidation resistance and slag erosion resistance were studied, and some important research results were obtained.The phase behavior of medium-low grade bauxite and zircon in the synthesis of ZrN-SiAlON refractory by carbothermal / aluminothermic reduction nitridation was analyzed and the optimized process parameters were obtained.When coke is used as reducing agent, relatively pure ZrN-SiAlON phase is synthesized from bauxite and zircon at 1600 擄C.Using ZrN-SiAlON refractory powder as matrix, sucrose solution as binder and SiC powder as binder, ZrN-SiAlON-SiC-C multiphase non-oxide refractories were prepared.After heat treatment of 1500 擄C, ZrN-SiAlON refractory powder was affected by the decomposition of sucrose, resulting in the formation of ZrO _ 2, corundum and quartz, resulting in volume expansion, increasing apparent porosity and decreasing volume density. When the amount of ZrN-SiAlON refractory powder was 40 wt.wt%,The apparent porosity, bulk density and flexural strength of ZrN-SiAlON-SiC-C multiphase refractories were 53.23, 1.36 g / cm ~ 3 and 4.39 MPa, respectively, but the contents of ZrO _ 2, corundum and quartz were increased, which was helpful to improve the flexural strength of ZrN-SiAlON-SiC-C multiphase refractories.The oxidation behavior of ZrN-SiAlON-SiC-C multiphase refractories is studied. The results show that the mass changes of ZrN-SiAlON-SiC-C composites are mainly oxidized by amorphous carbon and SiC powders during the oxidation process.In addition, when the oxidation temperature is 1200 擄C, ZrO2 reacts with cristobalite to form zircon, and when the oxidation temperature is 1400 擄C, corundum and cristobalite form mullite.The effect of atmosphere on slag erosion resistance of ZrN-SiAlON-SiC-C multiphase refractories was studied. The results showed that in oxygen atmosphere, the refractory was oxidized seriously, resulting in larger porosity and serious slag erosion.In argon atmosphere, blast furnace slag infiltrates into refractories, dissolves them, and then penetrates continuously, filling the pores of refractories to form dense layers.In reducing atmosphere, the wetting angle of blast furnace slag to refractory becomes larger, and no erosion occurs.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ175.1

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