二步法化学强化屏幕保护玻璃组成和工艺发展及展望
TB 32; 碱铝硅酸盐玻璃(R2 O-Al2 O3-SiO2 ,R为Li/Na/K任一或几种组合)是显示终端重要屏幕保护材料. 为进一步提升和改善屏幕保护玻璃的耐划伤和抗冲击性能,采用二步法化学强化工艺已成为新的技术发展趋势,围绕不同玻璃体系和化学组成分析比较表面压应力(compressive stress,CS)和离子交换层深度( depth of layer,DOL)特点,结果表明:不含Li2 O的碱铝硅酸盐玻璃进行二步法化学强化后,玻璃表面的CS较第1步化学强化会有所减小,最大应力值向玻璃内部迁移,阻止了玻璃微裂纹向内部扩展的趋势;含Li2 O的玻璃在进行二步法化学强化后,玻璃表面CS...
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| Published in | 北京工业大学学报 Vol. 45; no. 9; pp. 918 - 926 |
|---|---|
| Main Authors | , , , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
平板显示玻璃技术和装备国家工程实验室,石家庄 050000%北京工业大学材料科学与工程学院,北京,100124%四川旭虹光电科技有限公司,四川 绵阳,621000
01.09.2019
北京工业大学材料科学与工程学院,北京 100124 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0254-0037 |
| DOI | 10.11936/bjutxb2018070015 |
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| Abstract | TB 32; 碱铝硅酸盐玻璃(R2 O-Al2 O3-SiO2 ,R为Li/Na/K任一或几种组合)是显示终端重要屏幕保护材料. 为进一步提升和改善屏幕保护玻璃的耐划伤和抗冲击性能,采用二步法化学强化工艺已成为新的技术发展趋势,围绕不同玻璃体系和化学组成分析比较表面压应力(compressive stress,CS)和离子交换层深度( depth of layer,DOL)特点,结果表明:不含Li2 O的碱铝硅酸盐玻璃进行二步法化学强化后,玻璃表面的CS较第1步化学强化会有所减小,最大应力值向玻璃内部迁移,阻止了玻璃微裂纹向内部扩展的趋势;含Li2 O的玻璃在进行二步法化学强化后,玻璃表面CS与DOL同时增加,表明2种玻璃化学强化机理不同. 不含Li2 O的玻璃在进行第1步化学强化时,纯KNO3熔盐中的K+交换了玻璃表面的Na+,这时CS达最大值,而进行第2步化学强化时,由于熔盐中加入一定比例的NaNO3 降低了K+浓度梯度,使得第1步化学强化在玻璃表面积累的K+又被熔盐中的Na+交换出来;而含有Li2 O的玻璃,第1步交换时采用KNO3 与NaNO3 的混合熔盐,主要目的是使熔盐中的Na+与玻璃中的Li+交换,到达一定深度,而后第2步采用比例更高的KNO3 熔盐或者纯KNO3 熔盐进行化学强化,使K+与第1步时进入玻璃表面的Na+交换,这样K+就可以到达玻璃更深处,从而达到增加CS与DOL的目的. 同时从工艺和成本展望碱铝硅酸盐玻璃的化学强化工艺应回归到一步法二元离子交换工艺. |
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| AbstractList | TB 32; 碱铝硅酸盐玻璃(R2 O-Al2 O3-SiO2 ,R为Li/Na/K任一或几种组合)是显示终端重要屏幕保护材料. 为进一步提升和改善屏幕保护玻璃的耐划伤和抗冲击性能,采用二步法化学强化工艺已成为新的技术发展趋势,围绕不同玻璃体系和化学组成分析比较表面压应力(compressive stress,CS)和离子交换层深度( depth of layer,DOL)特点,结果表明:不含Li2 O的碱铝硅酸盐玻璃进行二步法化学强化后,玻璃表面的CS较第1步化学强化会有所减小,最大应力值向玻璃内部迁移,阻止了玻璃微裂纹向内部扩展的趋势;含Li2 O的玻璃在进行二步法化学强化后,玻璃表面CS与DOL同时增加,表明2种玻璃化学强化机理不同. 不含Li2 O的玻璃在进行第1步化学强化时,纯KNO3熔盐中的K+交换了玻璃表面的Na+,这时CS达最大值,而进行第2步化学强化时,由于熔盐中加入一定比例的NaNO3 降低了K+浓度梯度,使得第1步化学强化在玻璃表面积累的K+又被熔盐中的Na+交换出来;而含有Li2 O的玻璃,第1步交换时采用KNO3 与NaNO3 的混合熔盐,主要目的是使熔盐中的Na+与玻璃中的Li+交换,到达一定深度,而后第2步采用比例更高的KNO3 熔盐或者纯KNO3 熔盐进行化学强化,使K+与第1步时进入玻璃表面的Na+交换,这样K+就可以到达玻璃更深处,从而达到增加CS与DOL的目的. 同时从工艺和成本展望碱铝硅酸盐玻璃的化学强化工艺应回归到一步法二元离子交换工艺. |
| Abstract_FL | Alkali alumina silicate glass ( R2 O-Al2 O3-SiO2, R is Li/Na/K either or combination) is an important screen protected material for display terminals. To further improve the scratch resistance and impact resistance of cover glass, the two-step chemically strengthened process has become a research direction. In this paper, the characteristics of surface compressive stress (CS) and depth of layer (DOL) were compared with different glass systems and chemical compositions. Results show that after two-step chemical strengthened process of Li2 O-free glass, the CS value on the surface is reduced compared with the first step, and the maximum stress value migrates into the interior of the glass, preventing the glass microcrack from expanding to the inside. After two-step chemically strengthened process of Li2 O-containing glass, the surface CS and DOL of the glass increase simultaneously, indicating that the principles of the two chemically strengthened methods are different. The Li2 O-free glass,when in the first step of chemically strengthened process, the K+ in the pure KNO3 molten salt exchanges Na+ on the surface of the glass, at that time CS reaches its maximum, and in the second step, added some NaNO3 in the molten salt. It reduces the K+ concentration gradient, so that the K+accumulated on the glass surface in the first step is exchanged by Na+ in the molten salt. Li2 O-containing glass, used KNO3 and NaNO3 mixed molten salt when in the first step of chemically strengthened process, the main purpose is to exchange Na+ in molten salt with Li+ in glass,and then the molten salt with higher KNO3 ratio or pure KNO3 is used in the second step of chemically strengthened process,so that K+ can be exchanged with Na+ entering the glass surface. The main purpose is to increase CS and DOL. At the same time, this paper describes that the chemically strengthened process of alkali alumina silicate glass should return to the one step ion exchange process because of complex process and cost of production. |
| Author | 田英良 杨宝瑛 宫汝华 李俊杰 王伟来 吕锋 孙诗兵 |
| AuthorAffiliation | 北京工业大学材料科学与工程学院,北京 100124;平板显示玻璃技术和装备国家工程实验室,石家庄 050000%北京工业大学材料科学与工程学院,北京,100124%四川旭虹光电科技有限公司,四川 绵阳,621000 |
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| Author_FL | YANG Baoying TIAN Yingliang GONG Ruhua SUN Shibing Lü Feng WANG Weilai LI Junjie |
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| DocumentTitle_FL | Development and Prospect of Two-step Chemically Strengthened Cover Glass Composition and Process |
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| Keywords | 屏幕保护玻璃 表面压应力 二步法工艺 碱铝硅酸盐玻璃 chemically strengthened two-step process surface compressive stress cover glass 化学强化 压应力层深度 alkali alumina silicate glass depth of layer |
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| Snippet | TB 32; 碱铝硅酸盐玻璃(R2 O-Al2 O3-SiO2 ,R为Li/Na/K任一或几种组合)是显示终端重要屏幕保护材料. 为进一步提升和改善屏幕保护玻璃的耐划伤和抗冲击性能,采用二步法化学强化工艺已成为新的技术发展趋势,围绕不同玻璃体系和化学组成分析比较表面压应力(compressive... |
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