【作者】 粟海峰；

【导师】 王玺堂；

【作者基本信息】 武汉科技大学 ， 无机非金属材料， 2002， 硕士

【摘要】 近年来，随着冶金工业新技术的出现，耐火材料也随之迅速发展，正朝着更高层次符合耐材方向发展，即：正向以氧化物为主演变到氧化物与非氧化物并重且特别重视二者复合型的耐火材料。 从目前的研究看，非氧化物在耐火材料中的应用非常成功，如Sialon结合刚玉制品作为高炉陶瓷材料等，但是由于非氧化物的生产成本高以及非氧化物及其复合材料用作耐火材料的基础理论研究还不够，限制了非氧化物在耐火材料中的应用和转化。因此，研究非氧化物的合成及其复合材料的制备及性能、降低生产成本已是当务之急。 本文首先介绍了近年来非氧化物的研究与应用，综述了国内外对AlON、MgAlON的研究成果，抗氧化及抗渣方法的现状。 热力学分析表明：制备MgAlON及其复合材料必须在还原气氛下进行，碳热还原法制备MgAlON由于产物不容易控制、产物中残碳多等缺点而明显不如铝热还原法好。 采用铝热还原法在N₂炉中直接制备了MgAlON，利用热重分析研究了MgAlON的合成过程，并对其显微结构进行了分析。 直接制备了MgAlON结合复合材料并对其性能进行了研究。结果表明烧结温度、基质组成及外加剂的加入均对复合材料性能有影响。 镁铝氧氮（MgAlON）为非氧化物，容易与空气中的氧气在870℃左右发生氧化，研究其抗氧化性能是MgAlON复合材料得以广泛应用的一个重要措施。本文从等温法研究了MgAlON结合MA、刚玉复合材料的氧化动力学，建立了氧化动力学模型，实验数据能够另人满意的验证模型。等温氧化动力学研究表明，氧化反应 武汉科技大学硕士论文＿分为三个时期：化学反应速度控制、混合控速过程及扩散控速过程，分别符合 k。＿、＿．＿＿、，－，。、．、，、，。—一、。。、。—．．、—一、：， ＊W＝kr．t、《＊W)“＋卫I凸川＝k。／及b叫“＝入t描述。求出了各试样氧化速度常－ —’”’‘’”’一’”k 一’一＊”一’一”’“’“——”－“——”——””’－”’——’—。” 数k与氧化温度丁 以)的经验公式～ e＿ 本文研究了MgA旧N材料的抗渣性能。设计了与传统回转抗渣炉结构不同的－ 抗渣实验装置。采用回转抗渣法，研究了渣蚀动力学，并讨论分析了MgA旧N材－ 料的抗渣侵蚀过程。更多还原

【Abstract】 With the new technology development of the metallurgical industry, refractory has been developed rapidly also at a great high degree, That is, it is transmuted from oxides to non-oxides and oxides in the same important situation, especially their composite refractory.From present research work, non-oxides refractory has been applied successfully. For example, the refractory product of SiAlON bonded corundum is used for blast furnace and so on. But As high cost of non-oxide products and the poor basic theory study about it as refractory, the non-oxides refractory application is limited. So it is important to .research composition of non-oxides, preparation, properties of the composite refractory and reducing cost of non-oxide products.The paper at first introduces research and application of non-oxides, review research results of A1ON and MgAlON in domestic and abroad at the present, method of oxidation resistance mechanism and slag corrosion of non-oxides.Thermodynamic analysis indicates preparation of MgAlON and composite must be sintered in reducing atmosphere. Using carbothermal reduction method to prepare MgAlON is not suitable, because the products are not controlled easily and have carbon residue and so on, so carbothermal reduction method is not as good as aluminothermal reducing method.In our study work, the aluminothermal reducing method has been used to prepare MgAlON in N2 atmosphere and research synthesis process has been done by thermogravimetric analysis, and the microstructure of MgAlON synthesized samples was observed by SEM.Direct preparation of MgAlON bonded composite and its properties have been researched, the result show that sintering temperature, composition of matrix effect its properties.As a kind of non-oxides, MgAlON is oxidated in the air at 870℃. So research its oxidization resistance is a important work. In the study, the oxidation dynamic of MgAlON bonded MA and MgAlON bonded corundum refractory has been done by isothermal, the reseach results of isothermal oxidation dynamics show the oxidation reaction have three periods: the stage of chemical reaction control, the stage of admixture control and the stage of diffusion control. The results accord with . According the research theempirical formula of oxidation rate constant vs. oxidation temperature was obtained.Slag resistance of the MgAlON refractory was also studied by rotating slag resistance method. The slags attacking dynamics equation has been obtained and its slag attack mechanism has been explained.更多还原