High Quality Heat Resistant Quartz Tube for Semiconductor Diffusion, Photovoltaic Thermal Fields-Mia

Quartz tubes are fundamental tubular profiles manufactured from high-purity fused quartz through continuous fusion or vacuum sintering processes, achieving SiO₂ purities consistently above 99.99% with hydroxyl (OH) content reduced to below 5 ppm—effectively eliminating contamination risks from hydroxyl outgassing during high-temperature operations.Quartz tubes serve either as semi-finished profiles or directly as structural components. Their core value lies in delivering a tubular solution that simultaneously offers high purity, thermal resistance, thermal shock resistance, and excellent optical transmittance for applications including semiconductor diffusion furnace tubes, photovoltaic oxidation/annealing furnace chambers, ultraviolet sterilization lamp envelopes, and high-temperature thermocouple protection sheaths.

Material Grading and Multi-Scenario Adaptability

Based on purity requirements and optical performance demands for specific end-use applications, quartz tubes are classified into four major categories: clear transparent quartz tubes, opalescent quartz tubes, translucent (opaque) quartz tubes, and doped/modified quartz tubes. Clear transparent quartz tubes—particularly low-hydroxyl grades—exhibit full-spectrum transmittance ≥ 93% (190 nm–2,500 nm) and are widely employed in semiconductor diffusion furnace tubes and photochemical reactors. Opalescent quartz tubes, characterized by high infrared and ultraviolet reflectance (≥ 85%), are preferentially selected as peripheral thermal insulation liners for graphite susceptors in photovoltaic PECVD processes and as substrates for infrared heating lamp envelopes. Translucent opaque quartz tubes—containing numerous microscopic bubbles with a milky-white appearance—provide excellent thermal radiation shielding, making them suitable for insulation liners in high-temperature heat-treatment furnaces and heat exchanger tube bundles. Doped quartz tubes, incorporating titanium, cerium, or other elements to adjust UV cutoff wavelengths, are specifically engineered for mercury amalgam UV sterilization lamps and excimer light source envelopes, enabling precise regulation of ozone generation and sterilization efficiency.

Exceptional Thermal Stability and Thermal Shock Resistance

The thermal properties of quartz tubes derive from the inherently low expansion characteristics of fused silica—with a coefficient of thermal expansion of just 5.4×10⁻⁷/℃. Long-term operating temperatures range from 1,100°C (transparent grades) to 1,200°C (opalescent/opaque grades), with softening points exceeding 1,680°C. This enables quartz tubes to withstand repeated temperature cycling from ambient to 1,200°C (with dozens of cycles per day) in semiconductor diffusion processes without experiencing creep, distortion, or cracking. Compared to standard borosilicate glass tubes—which typically endure thermal shock differentials of only approximately 180°C—quartz tubes demonstrate thermal shock resistance exceeding 900°C (hot-to-cold differential). This fundamental reliability advantage in extreme alternating thermal fields substantially extends replacement cycles for critical thermal-zone components and reduces overall operation and maintenance costs for semiconductor and photovoltaic production lines.