用蓝晶石基莫来石制备高性能硅莫砖的研究

发布时间：2018-03-02 14:47

  本文选题：水泥回转窑　切入点：硅莫砖　出处：《郑州大学》2017年硕士论文　论文类型：学位论文

【摘要】：本课题是基于目前水泥窑用硅莫砖的生产工艺,通过引入一种新型的莫来石高硅氧玻璃复相材料-蓝晶石基莫来石,来探究其加入后硅莫砖各项性能的变化。实验以80高铝矾土、95碳化硅以及50和60蓝晶石基莫来石为主原料,首先研究了蓝晶石基莫来石种类及加入量对硅莫砖性能的影响;然后研究了在加入一定量蓝晶石基莫来石的前提下,变化SiC加入量及粒度对硅莫砖性能的影响;最后探究了所得实验室结果用于工业化生产的可行性。由于蓝晶石基莫来石具有体积密度低和玻璃相含量高的特点,因此,在配方中引入KBM50和KBM60蓝晶石基莫来石后,试样的体积密度、常温力学强度和荷重软化温度呈下降的趋势,但适量的KBM50和KBM60的加入增加了试样中莫来石化反应和莫来石含量,由于莫来石独特的高温力学性能,材料高温抗折强度有一定程度的提高。蓝晶石基莫来石组成为结构致密的莫来石和高黏度玻璃相,所以,其加入后材料的热震稳定性得到一定程度的改善。KBM50和KBM60加入量在20%时,试样经1100℃三次水冷热震试验后强度保持率分别为53.0%和50.4%,相比参照样的44.0%均有较大程度提升。此外,由于KBM60比KBM50铝含量高,因此在加入量相同情况下,KBM60系列试样的常温和高温力学性能均略优于KBM50系列试样,但其热震稳定性则明显不如后者。当选择KBM50加入量为20%,增加SiC含量和粒度时,试样烧结性逐渐变差。但碳化硅细粉的增加可以部分填充试样中的刚玉-莫来石骨架结构,在一定程度上提高试样的高温力学强度。此外,由于SiC优越的导热性能,碳化硅含量增加时,试样热震稳定性逐步得到改善,其中SiC加入量在19%时,试样热震后强度保持率达到59.0%,但当SiC加入粒度增大时,其在材料中呈不连续孤立分布,其高热导率这一特点被大幅削弱,热震稳定性逐渐恶化。在工厂条件下的试验结果表明,KBM50蓝晶石基莫来石加入量为20%时,制备的硅莫砖热震稳定性远优于其它试验砖,其热震循环30次时的受热端面破损率仅为27.4%。而当此加入量全部以细粉形式加入到硅莫砖中时,硅莫砖的热震稳定性达最佳,其热震循环30次时受热端面破损率仅为5.7%,但由于其集中分布使莫来石化进行的时间和温度过于集中,致使该试验砖荷重软化温度和耐压强度均较低。当SiC加入量从3%逐步增加到19%时,硅莫砖热震稳定性得到改善,且相应试验砖表面氧化层厚度也逐渐减小。其中,当SiC加入量为15%和19%时,试验砖氧化层厚仅为3mm和1mm。由于SiC的保护性氧化,一定厚度氧化膜的存在提高了硅莫砖的抗氧化性,使SiC的作用得以保持。
[Abstract]:This paper is based on the production technology of silicamol brick used in cement kiln, by introducing a new mullite high silica glass multiphase material, blue crystal stone based mullite. In order to study the change of the properties of Si-Mo brick after the addition, the effects of the type and the amount of the blue-crystal stone mullite on the properties of Si-Mo brick were studied with 80 bauxite and 50 and 60 blue crystal based mullite as the main raw materials in the experiment. Then, the influence of the amount and particle size of SiC on the properties of Si-Mo brick was studied under the premise of adding a certain amount of blue crystal based mullite. Finally, the feasibility of using the obtained laboratory results in industrial production was explored. Because of its low bulk density and high glass content, KBM50 and KBM60 were introduced into the formula. The bulk density, mechanical strength at room temperature and softening temperature of loading weight decreased, but the addition of proper amount of KBM50 and KBM60 increased mullite reaction and mullite content, due to the unique mechanical properties of mullite at high temperature. The high temperature flexural strength of the material has been improved to a certain extent. The composition of the blue crystal based mullite is dense mullite and high viscosity glass phase. Therefore, the thermal shock stability of the material is improved to a certain extent. KBM50 and KBM60 addition amount is 20? The strength retention rates of the samples were 53.0% and 50.4 respectively after the third hydrothermal shock test at 1100 鈩，

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