Abstract:
An object of the present invention is to provide silica glass having high purity, high heat resistance, large coefficient of thermal expansion, and low light transmittanc. Another object of the present invention is to provide a silica glass jig with a vapor-deposited film thereon. Therfore Cristobalite-contained silica glass wherein α-cristobalite in the shape of a small sphere or a small, round-edged or sharp-edged, three-dimensional region is dispersed in the silica glass matrix, the diameter of each α-cristobalite sphere or region is in the range of 0.1 µm to 1000 µm, a content of the α-cristobalite is at least 10 wt %, and small-sized independent bubbles which are additionally dispersed in the silica glass matrix. The silica glass jig is made of the cristobalite-contained silica glass and the surface of the jig is covered with a vapor-deposited thin film which has a property of being resistant to plasma etching, and which is made of a material of almost the same coefficient of thermal expansion as that of the silica glass. The silica glass jig has no chance to generate particles therefrom and thereby to contaminate a silicon wafer.
Abstract:
Opaque silica glass having a density of 2.0 to 2.18 g/cm 3 , sodium and potassium elements concentrations in the silica glass of each 0.5 ppm or less and an OH group concentration of 30 ppm or less, and containing bubbles which are independent bubbles having the following physical values:
(1) a bubble diameter of 300 µm or less, and (2) a bubble density of 100,000 to 1,000,000 bubbles/cm 3 , and a production process for opaque silica glass, comprising: filling quartz raw material grain having a particle size of 10 to 350 µm in a heat resistant mold, heating it in a non-oxidizing atmosphere from a room temperature up to a temperature lower by 50 to 150°C than a temperature at which the above raw material grain is melted at a temperature-raising speed not exceeding 50°C/minute, then, slowly heating it up to a temperature higher by 10 to 80°C than the temperature at which the quartz raw material grain is melted at the speed of 10°C/minute or less, and cooling after maintaining at the above temperature.
Abstract translation:密度为2.0〜2.18g / cm 3的不透明二氧化硅玻璃,二氧化硅玻璃中的钠和钾元素浓度为0.5ppm以下,OH基浓度为30ppm以下,并且含有独立气泡的气泡 具有以下物理值:(1)气泡直径为300μm以下,(2)泡孔密度为100,000〜1,000,000个气泡/ cm 3,以及不透明石英玻璃的制造方法,其特征在于,包括: 在耐热模具中具有10〜350μm的粒径的原料颗粒,在非氧化性气氛中从室温加热到比上述原料的温度低50〜150℃的温度 材料颗粒以不超过50℃/分钟的升温速度熔化,然后缓慢加热至比石英原料颗粒熔化温度高10至80℃的温度,速度为 10℃/分钟以下,mai后冷却 在上述温度下保持。
Abstract:
The high-purity, opaque quartz glass containing 3 x 10⁶ - 9 x 10⁶ of closed cells having an average size of 20-40 µm per 1 cm³, a ratio of closed cells having sizes of 100 µm or more to the whole of cells being 1% or less, thereby showing 5% or less of linear transmittance for near infrared rays (λ=900 nm) at a thickness of 1 mm is produced by compacting amorphous silica powder having an average particle size of 0.5-10 µm, in which each of impurities selected from Li, Na, K, Fe, Ti and Al is 1 ppm or less, if any, and sintering the resultant green body at 1730-1850°C.
Abstract:
A system and method for sintering a thin, high purity fused silica glass sheet having a thickness of 500 μm or less, includes a step of rastering a beam of a laser across a sheet of high purity fused silica soot; wherein a pattern of the rastering includes tightly spacing target locations on the sheet such that the laser sinters the soot and simultaneously forms tiny notches on a first major surface of the sheet when viewed in cross-section, wherein the tiny notches are crenellated such that at least some of the notches have generally flat bottom surfaces and at least some respective adjoining caps have generally plateau top surfaces offset from the bottom surfaces by steeply-angled sidewalls.
Abstract:
A known diffuser material of synthetically produced, pore-containing quartz glass has a chemical purity of at least 99.9% SiO 2 , a cristobalite content of not more than 1 %, and a density in the range of 2.0 to 2.18 g/cm 3 . Starting therefrom, to indicate a diffuser material which is improved with respect to diffuse reflectivity with Lambertian behavior over a wide wavelength range, high material homogeneity and UV radiation resistance, it is suggested according to the invention that the quartz glass has a hydroxyl group content in the range of at least 200 wt. ppm and that at least 80% of the pores have a maximum pore dimension of less than 20 µm.
Abstract translation:已知的合成制造的含孔石英玻璃的漫射体材料具有至少99.9%SiO 2的化学纯度,不超过1%的方石英含量, 密度在2.0-2.18g / cm 3范围内。 从这里开始,为了表明漫反射率相对于宽波长范围内的朗伯行为,高材料均匀性和抗UV辐射性得到改善的漫射体材料,根据本发明建议,石英玻璃的羟基含量在 至少200wt。 ppm,并且至少80%的孔具有小于20微米的最大孔隙尺寸
Abstract:
The present invention concerns a method for preparing a glass having bimodal macroporous and mesoporous porosity, consisting of subjecting a macroporous glass to pseudomorphic transformation. The present invention also concerns said glass prepared in this way and optionally functionalised, as well as the different uses thereof.
Abstract:
The invention relates to a method for the production of opaque quartz glass wherein a blank is made from synthetic SiO2 crystals and heated to form a blank body made of opaque quartz glass at a given vitrification temperature. A method for the production of pure, opaque quartz glass is disclosed wherein said quartz glass has a homogeneous pore distribution and a high density, a high viscosity and a lower tendency to devitrify. According to the invention, the SiO2 crystals are formed from an at least partially porous agglomerate of SiO2 primary particles (21; 31) having a specific surface (according to BET) between 1.5 m /g and 40 m /g with a stamping density of at least 0.8 g/cm . SiO2 granulate (21; 31) suitable for use in performing the procedure is characterized in that it is composed of an at least partially porous agglomerate of SiO2 primary particles and has a specific surface (according to BET) between 1.5 m /g and 40 m /g in addition to a stamping density of at least 0.6 g/cm .