本文選題：廢玻璃 + 多孔微晶玻璃��； 參考：《南昌航空大學》2015年碩士論文

【摘要】：多孔微晶玻璃是由無機非晶材料熱處理得到的含有閉合孔或連通孔微晶材料,其性能取決于氣孔、晶相和非晶相比例與結(jié)構(gòu),具有密度低、比表面積大、導熱系數(shù)小、強度高、阻尼性能好等優(yōu)異性能。利用廢玻璃生產(chǎn)多孔微晶玻璃,不僅解決了廢玻璃規(guī)�；�,而且顯著降低多孔微晶玻璃生產(chǎn)成本,簡化生產(chǎn)工藝,具有顯著經(jīng)濟和環(huán)保效益。本文以廢玻璃粉為原料,采用低溫燒結(jié)-高溫發(fā)泡新型燒結(jié)工藝,優(yōu)選發(fā)泡劑和燒結(jié)助劑,系統(tǒng)研究燒結(jié)工藝制度、發(fā)泡劑組成對氣孔結(jié)構(gòu)、晶相組成、表觀密度、壓縮強度和導熱性能等影響規(guī)律,制備出輕質(zhì)、孔徑均勻可控、高強度多孔微晶玻璃及其復(fù)合板。發(fā)泡劑組份研究表明,以CaCO3為發(fā)泡劑時,隨CaCO3含量增加,多孔微晶玻璃表觀密度與抗壓強度都是先減小后增大,孔隙率則與之相反,晶相為單一硅灰石結(jié)構(gòu),結(jié)晶度增大。CaCO3和Si C為復(fù)合發(fā)泡劑時,CaCO3降低SiC氧化溫度,提高SiC氧化速率;SiC提高多孔微晶玻璃孔隙率,降低表觀密度,提高硅灰石含量。納米SiC使表觀密度增大,孔隙率降低,氣孔尺寸減小。多孔微晶玻璃導熱系數(shù)隨CaCO3含量增大而減小,導熱系數(shù)為0.096~0.139 W/m·K。使用復(fù)合發(fā)泡劑時,隨SiC含量增大,抗壓強度與表觀密度成正比,為0.7~4.7 MPa。燒結(jié)-發(fā)泡工藝實驗表明,以CaCO3為發(fā)泡劑時,隨燒結(jié)溫度升高和時間延長,多孔微晶玻璃表觀密度呈下降趨勢,孔隙率增大。隨發(fā)泡溫度升高和時間延長,表觀密度減小,平均孔徑和孔隙率增大。多孔微晶玻璃抗壓強度與表觀密度呈直線正比關(guān)系,抗壓強度為0.35~4.98 MPa。一次燒成多孔微晶玻璃復(fù)合板的關(guān)鍵在于調(diào)節(jié)釉料層原料成分,使其燒結(jié)和晶化溫度處于多孔微晶玻璃低溫燒結(jié)-高溫發(fā)泡溫度區(qū)間。發(fā)泡機理研究表明,廢玻璃粉體在800?C下出現(xiàn)致密燒結(jié),800~900?C之間出現(xiàn)氣孔形核和長大,與本文工藝設(shè)計思路一致。這種低溫燒結(jié)-高溫發(fā)泡不僅適合廢玻璃生產(chǎn)多孔微晶玻璃,對于其他固體廢渣回收利用也具有參考價值。
[Abstract]:Porous glass-ceramics are obtained by heat treatment of inorganic amorphous materials with closed or connected pores. Their properties depend on the porosity, the proportion and structure of crystalline phase and amorphous phase, and have low density, large specific surface area, small thermal conductivity and high strength. Excellent damping property and so on. The production of porous glass-ceramics by waste glass not only solves the large-scale utilization of waste glass, but also significantly reduces the production cost of porous glass-ceramics, simplifies the production process, and has remarkable economic and environmental benefits. In this paper, using waste glass powder as raw material, a new sintering process of low temperature sintering and high temperature foaming was used to select foaming agent and sintering assistant. The sintering process system was studied systematically. The composition of foaming agent for pore structure, crystal phase composition, apparent density was studied systematically. The high strength porous glass-ceramics and its composite plate were prepared by the influence of compression strength and thermal conductivity. The results show that when CaCO3 is used as foaming agent, the apparent density and compressive strength of porous glass-ceramics decrease first and then increase with the increase of CaCO3 content, and the porosity is opposite, the crystalline phase is a single wollastonite structure. With the increase of crystallinity, Caco _ 3 and sic were used as composite foaming agents to decrease the oxidation temperature of SiC, increase the oxidation rate of SiC, increase the porosity of porous glass-ceramics, decrease the apparent density and increase the content of wollastonite. Nanometer SiC increases apparent density, decreases porosity and decreases pore size. The thermal conductivity of porous glass-ceramics decreases with the increase of CaCO3 content, and the thermal conductivity is 0.096 ~ (0.139) W / m ~ (K). When the compound foaming agent is used, the compressive strength is proportional to the apparent density with the increase of SiC content, which is 0.7 ~ 4.7 MPA. The experimental results of sintering and foaming process show that the apparent density of porous glass-ceramics decreases and the porosity increases with the increase of sintering temperature and time when CaCO3 is used as foaming agent. With the increase of foaming temperature and time, the apparent density decreases and the average pore size and porosity increase. The compressive strength of porous glass-ceramics is proportional to the apparent density, and the compressive strength is 0.35 ~ 4.98 MPA. The key of single firing porous glass-ceramics composite plate is to adjust the raw material composition of glaze layer so that the sintering and crystallization temperatures are in the range of low-temperature sintering and high-temperature foaming temperature of porous glass-ceramics. The study of foaming mechanism shows that the dense sintering of waste glass powder under 800C has the appearance of porosity nucleation and growth, which is consistent with the process design in this paper. This kind of low-temperature sintering and high-temperature foaming is not only suitable for producing porous glass-ceramics, but also has reference value for the recovery and utilization of other solid waste slag.
【學位授予單位】：南昌航空大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ171.733

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