Quartz glass_Seahope New Material

Purity is an important indicator of quartz glass, which has a significant impact on its physical and chemical properties and its performance, such as devitrification, high-temperature strength, softening point, light transmission, thermal stability, chemical stability, radiation resistance, and fluorescence characteristics; in addition, quartz glass used in the semiconductor industry has even more stringent purity requirements, and trace impurities will seriously affect the electrical properties, lifespan, and integration level of semiconductor materials. Since the purity of semiconductor materials is required to be controlled below the ppb level, the purity of quartz glass should be controlled at the ppm level to meet the needs of the semiconductor industry. The segregation coefficient of B is close to 1, making it the most difficult to remove and the most harmful.

2021

09-29

Applications of quartz glass

The formation of quartz glass is due to the high viscosity of its melt at high temperatures. It is used in the manufacturing of semiconductors, electro-optical sources, semiconductor communication devices, lasers, optical instruments, laboratory instruments, electrical equipment, medical equipment, and high-temperature, corrosion-resistant chemical instruments, as well as in the chemical, electronic, metallurgical, building materials, and defense industries, with a wide range of applications. High-purity quartz glass can be used to make optical fibers. With the development of semiconductor technology, quartz glass is widely used in various processes of semiconductor production. For example, in the Czochralski method for converting polycrystalline silicon into single-crystal silicon; cleaning tanks used in cleaning; diffusion tubes and boats used in diffusion; ion implantation

2021

09-29

Introduction to Quartz Glass

Quartz glass is a glassy material composed of a single component of SiO2, containing trace amounts of metallic impurities and more or less hydroxyl groups (OH), belonging to special glass. It is usually called quartz or fused silica abroad. According to the building materials industry standard (JC/T 185-2013), it is divided into three categories according to its transmission characteristics: ultraviolet quartz glass (ZS), visible quartz glass (KS), and infrared quartz glass (HS). Because quartz glass is microscopically a silicon-oxygen tetrahedron "SiO4" structure, it has unique physicochemical properties that are unmatched by other glasses, and is known as the "king of glass", so it is widely used in nuclear technology, aerospace, precision optics and semiconductor industries. The special structure and manufacturing method of quartz glass lead to its excellent performance in terms of purity, expansion coefficient, chemical physics, and optics. 1. Purity Purity is an important indicator of quartz glass, which has a great influence on its physicochemical properties and application range, such as translucency, high-temperature strength, softening point, light transmission, thermal stability, chemical stability, radiation resistance, and fluorescence characteristics. The purity requirements for quartz glass used in the semiconductor industry are very strict, and trace impurities will seriously affect the electrical properties, lifespan, and integration of semiconductor materials. The purity of ultraviolet synthetic quartz can reach more than 99.9999% (total metal impurity content less than 1 ppm). 2. Chemical Stability Quartz glass is an acidic material, and except for hydrofluoric acid and hot phosphoric acid, it is inert to any other acid and is a good acid-resistant material. At room temperature, the corrosion of quartz glass by alkalis and salts is also slight, so quartz glass can also be used when contacting these reagents. 3. Thermal Stability Quartz glass has an extremely low thermal expansion coefficient, about 5.5 × 10-7/℃, which is one-twentieth that of ordinary glass, and also has good resistance to thermal shock. At the same time, quartz glass also has high temperature resistance and can be used for a long time at 1200℃. Ultra-low expansion or even zero-expansion quartz glass has become a current research hotspot. 4. Optical Properties The optical properties of quartz glass are unique, with high transmittance from deep ultraviolet to near-infrared spectrum (185-3500nm). In summary, quartz glass has excellent properties such as high temperature resistance, low thermal expansion coefficient, good chemical stability, excellent electrical insulation, low and stable ultrasonic delay performance, and full-spectrum transmission. The bubbles, streaks, uniformity, stress birefringence, and mechanical properties of the product are irreplaceable by other optical glasses. Quartz glass is one of the indispensable new materials in the fields of cutting-edge technology (space technology, nuclear technology, national defense equipment), as well as semiconductors, optical communication, and electro-optical sources.

2021

09-22

Chemical Properties of Quartz Glass

Quartz glass has an extremely low thermal expansion coefficient, high temperature resistance, excellent chemical stability, excellent electrical insulation, low and stable ultrasonic delay performance, optimal ultraviolet spectral performance, and visible and near-infrared spectral performance, and has higher mechanical properties than ordinary glass. Therefore, it is one of the indispensable excellent materials in modern cutting-edge technologies such as space technology, atomic energy industry, national defense equipment, automation systems, and semiconductors, metallurgy, chemical industry, electro-optic sources, communications, light industry, and building materials industries. Quartz glass is made by melting natural crystalline quartz (crystal or pure silica) or synthetic silane at high temperatures. Melting

2021

09-17

The formation of quartz glass

The formation of quartz glass is due to the high viscosity of its melt at high temperatures. It is used in the manufacturing of semiconductors, electro-optical sources, semiconductor communication devices, lasers, optical instruments, laboratory instruments, electrical equipment, medical equipment, and high-temperature, corrosion-resistant chemical instruments; it is widely used in chemical, electronic, metallurgical, building materials, and defense industries. High-purity quartz glass can be used to make optical fibers. With the development of semiconductor technology, quartz glass has been widely used in various processes of semiconductor production. For example, in the Czochralski method to convert polycrystalline silicon into single-crystal silicon; cleaning tanks used in cleaning; diffusion tubes and boats used in diffusion; and bells used in ion implantation.

2021

09-17

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