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NMR Study on Structural Characteristics of Rare Earth Doped Boro-Alumino-Silicate glasses

Journal of Rare Earths 2006年第4期24卷 413-417页

作者：陆春华倪亚茹张其土许仲梓 College of Materials Science and Engineering Nanjing University of Technology Nanjing 210009China

The structural characteristics of Re2O3 doped B2O3-Al2O3-SiO2 glasses and factors such as the component and heat-treating conditions affecting the glass structure were investigated by magic angle spin nuclear magnetic resonance （MAS NMR） spectroscopy and differential thermal analysis （DTA）. It is found that, in B2O3-Al2O3-SiO2 glass, the boron （4）, and Al（5）, Al（6） changes to Al（4）. On the other hand, compared with Ba^2＋ , RE^3＋ can accumulate the boron network because of its higher field strength, which results in a large network structure. With the increase of samarium oxide, the silicate coordination Qa（3T） will have predominance gradually. Heat-treatment has little effect on the boron and aluminum coordination sites in the glass structure.

关键词： glass forming glass structure magic angle spin nuclear magnetic resonance boro-alumino-silicate glass rare earths

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Polishing Techniques of Stainless Steel Molding Die for the Slumping Method of glass Optical Components

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Journal of Mechanics Engineering and Automation 2015年第7期5卷 395-400页

作者： Akira Shinozaki Akihiro Oki Koji Akashi Yoshiharu Namba Department of Mechanical Engineering National Institute of Technology Kurume College Fukuoka 8308555 Japan Department of Mechanical Engineering National Institute of Technology Ariake College Fukuoka 8368585 Japan Department of Mechanical Engineering Chubu University Aichi 4878501 Japan

In recent years, high precision geometric shape, surface roughness, and cost reduction are required for large glass component molding processes. In this research, the polishing process of stainless steel molding dies used to form thin glass components is investigated. The surface roughness of the polished stainless steel molding die surface is below Rz = 200 nm （P-V） at 15 h polishing with 0.5 % alumina polishing liquid. In the case of polishing process with only the weight of molding die and a polishing pressure of 0.5 kPa, polishing times are approximately 60 h and 20 h, respectively. Final surface roughness polished stainless steel molding die surface with pressure of 0.5 kPa is Rz = 7 nm （P-V）, rms -- 1.6 nm and Ra = 1.4 nm. In a thin glass component manufacturing method, ＂slumping method＂, surface roughness before glass forming is rms = 0.7 nm and Ra = 0.6 nm, and after is rms = 0.7 nm and Ra = 0.6 nm. Therefore, there were no observable changes their surface roughness.

关键词： Molding die polishing stainless steel glass forming surface roughness slumping method

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