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    • 8. 发明专利
    • Melted quartz glass and method for manufacturing the same
    • 熔融石英玻璃及其制造方法
    • JP2014005204A
    • 2014-01-16
    • JP2013215033
    • 2013-10-15
    • Tosoh Corp東ソー株式会社Tohos Sgm Kk東ソ−・エスジ−エム株式会社
    • ARAI KAZUYOSHITAKAHATA TSUTOMUHASHIMOTO SHINKICHIUCHIDA MASATOYAMADA SHUSUKEHARADA YOSHINORIHORIKOSHI HIDEHARU
    • C03C3/06C03B3/02C03B5/235C03B20/00
    • C03C4/0085C03B19/066C03B20/00C03B2201/03C03B2201/04C03C3/06C03C4/10C03C2201/23C03C2201/50C03C2201/54Y02P40/57
    • PROBLEM TO BE SOLVED: To inexpensively provide a melted quartz glass which is suitably usable for various optical materials that use ultraviolet rays, visible rays and infrared rays, a member for manufacturing a semiconductor, a member for manufacturing a liquid crystal, a member for manufacturing MEMS, and a glass substrate for a liquid crystal, has a high transmittance to ultraviolet rays, visible rays and infrared rays, has high purity and high heat resistance, and a low diffusion speed of a Cu ion.SOLUTION: In a melted quartz glass, an internal transmittance to ultraviolet light having a wavelength of 245 nm in a thickness of 10 mm is 95% or more, an OH content is 5 ppm or less, and each content of Li, Na, K, Mg, Ca and Cu is less than 0.1 ppm. Preferably, Al is contained therein in weight ratio of 2 ppm or less, the viscosity at 1,215°C is 10Pa s or more, and a diffusion coefficient of a Cu ion in a depth of 20 to 100 μm from the surface in thermal diffusion of the Cu ion at 1,050°C in the atmosphere is 1×10cm/sec or less. Such a melted quartz glass can be obtained by previously converting raw material silica powder into cristobalite, and then melting the cristobalitized silica powder in a non-reducing atmosphere.
    • 要解决的问题:为了廉价地提供适用于使用紫外线,可见光和红外线的各种光学材料的熔融石英玻璃,用于制造半导体的部件,用于制造液晶的部件,制造用部件 MEMS和用于液晶的玻璃基板对紫外线,可见光线和红外线具有高透射率,具有高纯度和高耐热性以及较低的Cu离子扩散速度。在熔融石英玻璃 对于厚度为10mm的波长为245nm的紫外线的内部透射率为95%以上,OH含量为5ppm以下,Li,Na,K,Mg,Ca,Cu的含量为 小于0.1ppm。 优选地,其中含有2重量%以下的Al,1,215℃下的粘度为10Pa·s以上,Cu离子的热扩散表面的深度为20〜100μm的扩散系数 大气中1,050℃的Cu离子为1×10cm /秒以下。 这种熔融的石英玻璃可以通过将原料二氧化硅粉末预先转化为方英石,然后在非还原气氛中熔化澄清二氧化硅粉末来获得。