Core Physical Properties Build a Strong Barrier: High-Purity Quartz Sheets Become a Core Substrate in High-End Manufacturing

In high-end manufacturing fields such as semiconductor lithography, optical communication transmission, precision optics, high-end photovoltaics, and aerospace, quartz sheets are indispensable core functional substrates. Unlike ordinary glass and silicate materials, high-purity quartz sheets, with their unique comprehensive physical properties of optical, thermal, mechanical, and chemical properties, have become a key material that is difficult to replace in the high-end industrial chain. With continuous breakthroughs in domestic quartz purification, slicing, and polishing processes, clarifying the core physical properties and industrial application value of quartz sheets has become a core basis for material selection, process upgrading, and application expansion for companies in the industrial chain.

The core substrate of quartz sheets is silicon dioxide (SiO₂), which is produced through multiple processes including high-purity ore purification, melting, slicing, and precision polishing. Its unique crystal structure endows the material with ultimate comprehensive physical properties, mainly covering five core dimensions: thermal properties, optical properties, mechanical properties, chemical properties, and electrical properties. These are also the core barriers to its adaptation to high-end precision manufacturing.

I. Exceptional Thermal Performance: High Temperature Resistance, Low Expansion, Adaptable to Extreme Temperature Differences

Thermal properties are one of the core advantages of quartz sheets, and a key difference between them and ordinary glass materials. High-purity quartz sheets have a melting point as high as 1730℃ and a softening temperature exceeding 1700℃. They can operate stably for extended periods at 1100℃ and withstand short-term temperatures up to 1400℃, far exceeding the high-temperature limits of ordinary optical glass and tempered glass. This makes them perfectly suited for high-temperature processes such as semiconductor high-temperature diffusion, wafer annealing, and photovoltaic high-temperature sintering.

Simultaneously, quartz sheets possess an extremely low coefficient of thermal expansion, only 5.5 × 10⁻⁷/℃ at room temperature, approximately 1/20th that of ordinary glass. This characteristic allows quartz sheets to withstand drastic temperature differences, including rapid heating and cooling, without deformation, cracking, or stress deformation, exhibiting exceptional dimensional stability. In lithography machine optical systems, precision instrument calibration, and aerospace equipment operating under alternating high and low temperatures, quartz sheets maintain structural precision, ensure equipment operational stability, and significantly reduce error losses in precision equipment.

II. Excellent Full-Spectrum Transmittance: A Core Substrate for High-End Optical Equipment

High-purity quartz sheets possess an ultra-wide spectral transmittance range, making them one of the inorganic materials with the best transmittance in the industrial field. Ordinary glass exhibits severe absorption and blockage of ultraviolet and far-infrared light, while high-quality quartz sheets achieve high transmittance across the entire spectrum from 185nm to 3500nm. Their transmittance in the ultraviolet and deep ultraviolet bands far exceeds that of other optical materials, with no spectral shift or stray light loss.

Based on this physical property, quartz sheets have become an essential material in high-end optics: deep ultraviolet quartz sheets are suitable for lithography machine exposure windows, ultraviolet detection instruments, and precision spectral analysis equipment; visible and infrared high-transmittance quartz sheets are widely used in fiber optic communication lenses, infrared thermography equipment, and optical components of laser equipment. Meanwhile, high-purity quartz sheets exhibit high uniformity of light transmission and stable refractive index, effectively avoiding optical distortion and ensuring the precision and performance limits of high-end optoelectronic equipment. They are a core foundational material for the optoelectronic industry chain.

III. Stable Mechanical Properties: High Hardness, Wear Resistance, and Deformation Resistance

From a mechanical perspective, quartz sheets have a Mohs hardness of up to 7, possessing excellent wear resistance and scratch resistance, far superior to ordinary glass, acrylic, resin, and other optical materials. They can withstand friction, erosion, and minor impacts in industrial production for extended periods without easily developing surface damage, significantly extending the lifespan of precision components.

Furthermore, quartz sheets have high mechanical strength and rigidity, exhibiting excellent compressive and bending resistance. Even precision-machined ultra-thin quartz sheets maintain good structural stability and are not prone to plastic deformation. In applications such as semiconductor wafer carriers, precision mold pads, and protective lenses for high-end instruments, they can maintain dimensional accuracy over long periods, adapting to the demands of high-precision, high-load industrial operations and effectively reducing equipment maintenance and replacement costs.

IV. Extreme Chemical Stability: Corrosion-Resistant and Insulating, Adaptable to Complex Industrial Environments

Quartz sheets exhibit extremely stable chemical properties, possessing exceptional corrosion resistance and anti-aging characteristics. At room temperature, except for hydrofluoric acid, they show virtually no chemical reaction with strong acids, strong alkalis, salt solutions, or organic solvents. They can withstand long-term acid and alkali corrosion and moisture erosion without oxidation, deterioration, or weathering. In precision chemical testing, semiconductor wet cleaning, and highly corrosive industrial processes, they maintain stable material performance and structure, adapting to complex and harsh production environments.

Simultaneously, quartz sheets possess excellent insulating properties, exhibiting extremely high insulation stability under high-frequency and high-voltage conditions and very low dielectric loss. They are a superior insulating substrate for high-end electronic, power, and radio frequency equipment. They effectively prevent high-voltage breakdown and signal interference, and are widely used in the insulation protection structures of semiconductor electronic components, high-frequency communication equipment, and high-voltage precision instruments.

V. High-Precision Machining Adaptability: Empowering the Upgrade of High-End Precision Manufacturing

Based on the aforementioned core physical properties, high-purity quartz sheets possess excellent adaptability to precision machining, enabling ultra-thin slicing, ultra-high precision polishing, and irregular precision engraving. The processed surfaces exhibit high flatness, no internal stress, and minimal precision error, meeting the demands of nanoscale precision manufacturing.

Currently, with continuous breakthroughs in domestic quartz material purification technology and precision machining processes, domestic enterprises have achieved large-scale mass production of quartz sheets with high uniformity, high light transmittance, and low defects. The physical performance stability of these products consistently matches that of imported products, comprehensively covering high-end applications such as semiconductor lithography, high-end optics, optical communication, photovoltaics, and precision instruments, accelerating import substitution.

Industry Summary

Overall, the multiple superior physical properties of quartz sheets—high temperature resistance and low expansion, full-spectrum high light transmittance, high hardness and wear resistance, strong corrosion resistance, and high insulation—jointly constitute the core technological barrier of quartz sheets and are the core reason for their long-term monopoly in the high-end precision manufacturing industry chain. Under the global trend of localization and refinement in high-end manufacturing, and relying on its unique physical properties and the iterative upgrading of domestic processes, the market penetration rate of high-purity quartz sheets will continue to increase, making it a core track with high growth and high certainty in the new materials industry.