本文選題：流變性 + 莫來石化��； 參考：《武漢科技大學(xué)》2015年碩士論文

【摘要】：采用泡沫法制備的輕質(zhì)陶瓷材料具有較高的氣孔率,材料中的氣孔可以有效地阻止熱量的散失,起到良好的保溫效果。尤其在能源消耗日益增大,能源危機(jī)日漸加劇的當(dāng)今社會(huì),開發(fā)導(dǎo)熱系數(shù)小、保溫效果好的輕質(zhì)隔熱材料極為重要。同時(shí)輕質(zhì)材料中大量氣孔的存在可以減少材料的使用,達(dá)到節(jié)約資源的目的。 本文研究了以紅柱石為主要原料制備莫來石輕質(zhì)保溫材料的過程。借助流變儀分別測(cè)試了固含量、粘土、硅微粉以及水泥對(duì)紅柱石料漿流變性能的影響。借助X射線衍射儀和掃描電子顯微鏡研究了紅柱石高溫莫來石化過程。另外還研究了容重對(duì)輕質(zhì)材料性能的影響。通過對(duì)Maxwell導(dǎo)熱模型的改進(jìn)得到了適合于本體系的導(dǎo)熱系數(shù)方程。 研究結(jié)果表明：在料漿的制備過程中,粘土的加入會(huì)增大料漿的粘度,但可以改善料漿的穩(wěn)定性；在固含量較低時(shí)(小于40%),硅微粉的加入也會(huì)增大料漿的粘度,對(duì)料漿的穩(wěn)定性也能起到一定的改善作用；水泥的加入對(duì)料漿的流變性影響不大。 紅柱石在1250℃開始莫來石化,1350℃時(shí)莫來石化過程速度較快,1400℃保溫3個(gè)小時(shí)可使紅柱石莫來石化完成。隨泡沫加入量的增大,試樣的容重減小。隨容重的減小,試樣真氣孔率和顯氣孔率均增大,閉氣孔率基本不變,耐壓強(qiáng)度減小,燒后線變化率增大,氣孔的平均尺寸增大。最后獲得制備不同容重梯度輕質(zhì)材料的技術(shù)。 綜合考慮材料的氣孔率、氣孔形狀和氣孔尺寸對(duì)導(dǎo)熱系數(shù)的影響得到了適合本體系的導(dǎo)熱系數(shù)模型：
[Abstract]:The light ceramic material prepared by foam method has high porosity and the porosity in the material can effectively prevent the heat loss and play a good thermal insulation effect. Especially in the society where energy consumption is increasing day by day and energy crisis is getting worse, it is very important to develop light heat insulation materials with small thermal conductivity and good thermal insulation effect. At the same time, the existence of a large number of pores in lightweight materials can reduce the use of materials and achieve the purpose of saving resources. In this paper, the process of preparing mullite light thermal insulation material using andalusite as main raw material is studied. The effects of solid content, clay, silica powder and cement on rheological properties of andalusite slurry were measured by rheometer. The high temperature mullitization process of andalusite was studied by means of X-ray diffractometer and scanning electron microscope. The effect of bulk density on the properties of lightweight materials was also studied. By improving the Maxwell thermal conductivity model, the thermal conductivity equation suitable for the system is obtained. The results show that the viscosity of slurry will be increased by adding clay, but the stability of slurry can be improved by adding clay, and the viscosity of slurry will be increased when the solid content is lower (< 40%). The stability of slurry can be improved to some extent, and the rheology of slurry is not affected by cement addition. When andalusite starts at 1250 鈩，

本文編號(hào)：1880862