本文選題：注凝成型　切入點：熔融石英陶瓷　出處：《湖南工業(yè)大學》2017年碩士論文

【摘要】：熔融石英陶瓷因其優(yōu)異的抗熱震性、低的熱膨脹系數(shù)和低的熱導率,被廣泛的應用在航空、電子、太陽能等領域,但傳統(tǒng)工藝制備的熔融石英陶瓷普遍存在致密性低、氣孔率高等缺陷,阻礙了它的更廣泛的應用。本論文主要對采用注凝成型工藝制備高強度、高致密性的熔融石英陶瓷的過程進行了系統(tǒng)研究,并對陶瓷生坯制備、燒結等各工藝步驟的影響因素進行了優(yōu)化和分析。本實驗以高純熔融石英粉為主要原料,采用低毒的甲基丙烯酸羥基乙酯(HEMA)/三羥甲基丙烷三丙烯酸酯(TMPTA)體系,分散劑是聚丙烯酸銨(NH4PAA),用乳酸調節(jié)pH值,引發(fā)劑和催化劑分別為過硫酸銨溶液(APS)、四甲基乙二胺(TEMED),添加Si_3N_4作為燒結助劑,最后利用微波燒結生坯。通過對陶瓷料漿的粘度測試,結合萬能材料試驗機、X射線衍射(XRD)、掃描電子顯微鏡(SEM)、電子密度計等表征方法對樣品進行檢測和分析。實驗結果表明,當料漿的固相含量為60vol%、pH值為4、分散劑添加量為1.5wt%、超聲波振動時間為20min時,料漿的分散性、流動性最穩(wěn)定;單體添加量為8wt%、交聯(lián)劑的加入量為4wt%、引發(fā)劑量為0.2wt%時,固化時間為30min,生坯的抗彎強度最高能達到16.5MPa;采用微波燒結時,添加量為1.5wt%Si_3N_4助劑,在升溫速率為20℃/min、燒結溫度為1150℃,保溫時間時間為2h時,燒制的樣品的抗彎強度最高能達到36.3MPa,體積密度能達到1.98g/cm3,性能得到了進一步的提升,實驗達到了預期的結果。
[Abstract]:Fused quartz ceramics are widely used in aviation, electronics, solar energy and other fields because of their excellent thermal shock resistance, low thermal expansion coefficient and low thermal conductivity.High porosity and other defects hinder its wider application.In this paper, the process of preparing fused quartz ceramics with high strength and high density by injection molding process was studied systematically, and the factors affecting the preparation and sintering of ceramic blank were optimized and analyzed.In this experiment, the high purity fused quartz powder was used as the main raw material, the low toxic hydroxyl ethyl methacrylate (Hema) / trimethylol propane triacrylate (TMPTAA) system was used, the dispersant was ammonium polyacrylate (NH4PAAN), and the pH value was adjusted with lactic acid.The initiator and catalyst were ammonium persulfate solution and tetramethyl ethylenediamine respectively, and Si_3N_4 was added as sintering assistant. Finally, the billet was sintered by microwave.The viscosity of ceramic slurry was measured and analyzed by means of X-ray diffraction, scanning electron microscope (SEM), electron densitometer and so on.When the curing time is 30 min, the maximum bending strength of the billet is 16.5 MPa, when microwave sintering is used, the amount of 1.5wt%Si_3N_4 is added, the heating rate is 20 鈩，

本文編號：1705934