本文選題：水泥回轉(zhuǎn)窯　切入點：硅莫磚　出處：《鄭州大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：本課題是基于目前水泥窯用硅莫磚的生產(chǎn)工藝,通過引入一種新型的莫來石高硅氧玻璃復(fù)相材料-藍(lán)晶石基莫來石,來探究其加入后硅莫磚各項性能的變化。實驗以80高鋁礬土、95碳化硅以及50和60藍(lán)晶石基莫來石為主原料,首先研究了藍(lán)晶石基莫來石種類及加入量對硅莫磚性能的影響;然后研究了在加入一定量藍(lán)晶石基莫來石的前提下,變化SiC加入量及粒度對硅莫磚性能的影響;最后探究了所得實驗室結(jié)果用于工業(yè)化生產(chǎn)的可行性。由于藍(lán)晶石基莫來石具有體積密度低和玻璃相含量高的特點,因此,在配方中引入KBM50和KBM60藍(lán)晶石基莫來石后,試樣的體積密度、常溫力學(xué)強度和荷重軟化溫度呈下降的趨勢,但適量的KBM50和KBM60的加入增加了試樣中莫來石化反應(yīng)和莫來石含量,由于莫來石獨特的高溫力學(xué)性能,材料高溫抗折強度有一定程度的提高。藍(lán)晶石基莫來石組成為結(jié)構(gòu)致密的莫來石和高黏度玻璃相,所以,其加入后材料的熱震穩(wěn)定性得到一定程度的改善。KBM50和KBM60加入量在20%時,試樣經(jīng)1100℃三次水冷熱震試驗后強度保持率分別為53.0%和50.4%,相比參照樣的44.0%均有較大程度提升。此外,由于KBM60比KBM50鋁含量高,因此在加入量相同情況下,KBM60系列試樣的常溫和高溫力學(xué)性能均略優(yōu)于KBM50系列試樣,但其熱震穩(wěn)定性則明顯不如后者。當(dāng)選擇KBM50加入量為20%,增加SiC含量和粒度時,試樣燒結(jié)性逐漸變差。但碳化硅細(xì)粉的增加可以部分填充試樣中的剛玉-莫來石骨架結(jié)構(gòu),在一定程度上提高試樣的高溫力學(xué)強度。此外,由于SiC優(yōu)越的導(dǎo)熱性能,碳化硅含量增加時,試樣熱震穩(wěn)定性逐步得到改善,其中SiC加入量在19%時,試樣熱震后強度保持率達(dá)到59.0%,但當(dāng)SiC加入粒度增大時,其在材料中呈不連續(xù)孤立分布,其高熱導(dǎo)率這一特點被大幅削弱,熱震穩(wěn)定性逐漸惡化。在工廠條件下的試驗結(jié)果表明,KBM50藍(lán)晶石基莫來石加入量為20%時,制備的硅莫磚熱震穩(wěn)定性遠(yuǎn)優(yōu)于其它試驗磚,其熱震循環(huán)30次時的受熱端面破損率僅為27.4%。而當(dāng)此加入量全部以細(xì)粉形式加入到硅莫磚中時,硅莫磚的熱震穩(wěn)定性達(dá)最佳,其熱震循環(huán)30次時受熱端面破損率僅為5.7%,但由于其集中分布使莫來石化進(jìn)行的時間和溫度過于集中,致使該試驗磚荷重軟化溫度和耐壓強度均較低。當(dāng)SiC加入量從3%逐步增加到19%時,硅莫磚熱震穩(wěn)定性得到改善,且相應(yīng)試驗磚表面氧化層厚度也逐漸減小。其中,當(dāng)SiC加入量為15%和19%時,試驗磚氧化層厚僅為3mm和1mm。由于SiC的保護(hù)性氧化,一定厚度氧化膜的存在提高了硅莫磚的抗氧化性,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，

本文編號：1556961