發(fā)布時(shí)間：2018-04-10 14:53

  本文選題：高鋁硅酸鹽玻璃 + 澄清劑��； 參考：《海南大學(xué)》2017年碩士論文

【摘要】：氣泡作為玻璃熔制過程中最常見的缺陷之一,極大程度影響著玻璃制品的外觀、透明度、機(jī)械強(qiáng)度、光學(xué)均勻性等,為了消除玻璃中的氣泡,添加合適的澄清劑是澄清過程中重要的一環(huán)。近年來,隨著玻璃品種和性能的改進(jìn)以及對(duì)環(huán)保的要求越來越嚴(yán)格,部分傳統(tǒng)的玻璃澄清劑已無法滿足要求,新型無毒環(huán)保、澄清效果更好的復(fù)合澄清劑成為當(dāng)前的研究熱點(diǎn)之一。目前,隨著觸摸屏電子設(shè)備的廣泛使用,覆蓋其表面的蓋板玻璃成為熱門的方向。高鋁硅酸鹽玻璃因其諸多優(yōu)良性能成為蓋板玻璃的首選材料。同時(shí),高鋁硅酸鹽玻璃也因熔點(diǎn)高、粘度大、表面張力大等性質(zhì),給其高質(zhì)量的生產(chǎn)帶來很大的困難,尤其是高鋁硅酸鹽玻璃的澄清中氣泡難以排除的問題一直困擾著很多玻璃生產(chǎn)廠家。本文中針對(duì)高鋁硅酸鹽玻璃,借助CelSian高溫觀測(cè)系,并使用差熱-熱重(DSC-TG)分析法,探索了不加澄清劑、加入各種單一澄清劑和二元復(fù)合澄清劑對(duì)玻璃熔體中氣泡的產(chǎn)生、長(zhǎng)大和排除過程的影響,分析了熔化澄清過程氣泡的變化情況。主要研究結(jié)果如下:(1)使用差熱-熱重(DSC-TG)分析法,可知本文中配合料的玻璃化轉(zhuǎn)變發(fā)生在861.3℃。在855.9-876.3℃之間,碳酸鹽和二氧化硅發(fā)生反應(yīng)吸收大量的熱;溫度繼續(xù)升高,剩余的二氧化硅溶解,并在硅酸鹽中擴(kuò)散的過程釋放大量的熱。(2)對(duì)于高鋁硅酸鹽玻璃而言,在添加不同的種類和用量的單一澄清劑時(shí),澄清效果最好的是0.5wt%的SrO2;在添加不同的種類和用量的二元復(fù)合澄清劑時(shí),澄清效果最好的是0.4wt%的SnO2+0.60wt%的Na2SO4。(3)借助CelSian高溫觀測(cè)系統(tǒng),完整地觀察到了高鋁硅酸鹽玻璃熔化澄清過程配合料的變化情況及各種澄清劑的作用溫度。同時(shí)可利用系統(tǒng)自帶的軟件輔助計(jì)算出氣泡的平均逸出速率、玻璃液對(duì)氣泡的吸收率。綜合各組數(shù)據(jù)可知,添加SnO2+Na2SO4復(fù)合澄清劑,由于兩者作用溫度的相差較大,可在澄清的不同階段釋放氣體,使氣泡的逸出加快,可達(dá)到梯度澄清的效果。(4)通過CelSian高溫觀測(cè)系統(tǒng),統(tǒng)計(jì)不同直徑范圍內(nèi)的氣泡數(shù)隨溫度分布的變化可知:在澄清劑未開始作用的階段,直徑在0.3-0.9mm范圍內(nèi)的氣泡數(shù)往往占到氣泡總數(shù)的70%-80%。一旦澄清劑開始反應(yīng),氣泡總數(shù)迅速上升并在l0min后到達(dá)峰值。直徑大于0.9mm的氣泡數(shù)大幅上升,氣泡的逸出明顯加快。
[Abstract]:As one of the most common defects in glass melting process, bubble greatly affects the appearance, transparency, mechanical strength and optical uniformity of glass products.The addition of appropriate clarifier is an important part of the clarification process.In recent years, with the improvement of glass varieties and properties and the stricter requirements for environmental protection, some of the traditional glass clarifiers have been unable to meet the requirements, and a new type of non-toxic environmental protection,The compound clarifier with better clarification effect has become one of the research hotspots at present.At present, with the wide use of touch-screen electronic devices, the cover glass covering its surface has become a hot direction.High-alumina silicate glass has become the preferred material for cover glass because of its many excellent properties.At the same time, because of its high melting point, high viscosity and high surface tension, high alumina silicate glass has brought great difficulties to its high quality production.In particular, the clarification of high-alumina silicate glass bubble is difficult to eliminate the problem has been puzzling many glass manufacturers.In this paper, with the help of CelSian high temperature observation system and differential thermogravimetric DSC-TG analysis method, the bubble generation in glass melt was investigated by adding all kinds of single clarifier and binary compound clarifier without clarifier, by means of CelSian high temperature observation system and DSC-TG analysis method.The effect of growth and exclusion process on the bubble changes in the process of melting clarification was analyzed.The main results are as follows: (1) the differential thermogravimetric (DSC-TG) method is used to determine the glass transition of the mixture at 861.3 鈩，

本文編號(hào)：1731673