20-900mm photovoltaic quartz furnace tube

The 20-900mm photovoltaic quartz furnace tube is a high-purity quartz glass tube designed specifically for the photovoltaic (solar) industry, semiconductor manufacturing, and high-temperature heat treatment processes. This product is made of high-purity fused silica (SiO ₂) material, which has excellent thermal stability, chemical inertia, low thermal expansion coefficient and excellent optical transmittance. It is suitable for processes such as crystal growth, diffusion, oxidation and annealing under high temperature environment.  

FAQ

Q1: In which process steps are photovoltaic quartz furnace tubes primarily used?

Photovoltaic quartz furnace tubes are primarily used in diffusion furnaces, oxidation furnaces, and annealing furnaces during the solar cell manufacturing process, serving as the core chamber of the heat treatment system. In the phosphorus diffusion process, they provide a contamination-free environment for the precise formation of PN junctions; in the oxidation process, they are used to grow a silicon dioxide passivation layer; and in the annealing process, they are used to eliminate internal lattice defects in the silicon wafers. All of these steps directly impact the final photovoltaic conversion efficiency of the solar cells.

Q2: What sizes and specifications are available for your furnace tubes?

We offer a full range of photovoltaic quartz furnace tubes with outer diameters ranging from 20 mm to 900 mm, covering all needs from small-sized experimental tubes to extra-large mass-production tubes. Length, wall thickness, flange types, and end configurations can all be custom-manufactured according to customer drawings or process requirements. We also support a variety of material options, including domestically produced high-purity materials and imported materials, to ensure compatibility with different temperature and cleanliness requirements.

Q3: What challenges do quartz furnace tubes typically face at high temperatures? How do you address them?

During prolonged high-temperature operation, furnace tubes may face issues such as deformation and sagging, crystallization and loss of transparency, and thermal stress cracking. We enhance the geometric precision and thermal stability of the tubes by selecting high-purity synthetic fused quartz raw materials and optimizing welding and forming processes (such as glass lathe welding technology and integrated grinding and forming technology). At the same time, we strictly control product concentricity, perpendicularity, and the parallelism of flange sealing surfaces, effectively extending service life and reducing unplanned downtime.

Q4: What are the advantages of quartz furnace tubes compared to silicon carbide furnace tubes?

Although silicon carbide offers a longer service life in certain applications, quartz furnace tubes still possess unique advantages in terms of light transmittance, chemical purity, and cost. Quartz furnace tubes offer excellent optical transmittance, facilitating process monitoring; their extremely high chemical purity effectively prevents metal impurity contamination from spreading into the process. Furthermore, quartz offers high processing flexibility, allowing for the customization of complex end structures, and its initial investment cost is significantly lower than that of silicon carbide furnace tubes, making it well-suited to the economic requirements of high-volume photovoltaic production lines.

Photovoltaic quartz furnace tube specifications

-Diameter range: 20mm to 900mm (other sizes can be customized according to requirements)

-Length: Customizable (standard length usually ranges from 1000mm to 3000mm)

-Wall thickness: 1.5mm to 10mm (adjustable according to application requirements)

-Purity: ≥ 99.99% SiO ₂, low impurity content (such as Al, Fe, Na, etc.)

-Temperature resistance: can withstand temperatures above 1200 ° C in the short term, and can withstand temperatures up to 1100 ° C for long-term use

-Transparency: High UV infrared transmittance, suitable for photovoltaic silicon wafer processing

How to Solve Your Process Challenges

During high-temperature thermal processing of photovoltaic cells, furnace tubes face three key challenges: tube deformation caused by high-temperature creep, crystallization contamination affecting wafer quality, and cracking caused by thermal cycling stress. These issues directly lead to reduced process uniformity, increased equipment downtime, and yield losses.

Our quartz furnace tubes help you address these issues in the following ways:

For high-temperature deformation: We use high-purity fused quartz material with a softening point as high as 1730°C, enabling long-term stable operation at 1100–1250°C and providing excellent resistance to sagging.

To address crystallization contamination: We strictly control raw material purity (SiO₂ content ≥ 99.99%) and combine this with precision surface treatment processes to significantly reduce the tendency for high-temperature crystallization, maintain a smooth inner wall, and minimize interference with diffusion processes caused by impurity release.

To address thermal stress cracking: The quartz material has an extremely low coefficient of thermal expansion and excellent thermal shock resistance, enabling it to withstand drastic temperature changes—such as direct water cooling from high temperatures—without cracking, thereby meeting the demands of frequent process changes.

Advantages and problem-solving abilities

1. High purity and low pollution

-Made of high-purity quartz sand, it reduces the precipitation of metal impurities (such as Fe and Al), avoids contaminating silicon wafers, and improves the conversion efficiency of photovoltaic cells.  

-Strong chemical inertness, acid resistance (except hydrofluoric acid), alkali corrosion resistance, suitable for highly corrosive process environments.  

2. Excellent thermal stability

-Low thermal expansion coefficient (5.5 × 10 ⁻⁷/° C), which is not easy to crack during rapid temperature rise and fall, extending the service life.  

-No deformation or crystallization at high temperatures, ensuring long-term stable operation.  

3. Customized design

-We can provide quartz tubes with different diameters, lengths, and wall thicknesses to meet the needs of special furnace types.  

-Support customization of additional structures such as flange interfaces, heads, and branch tubes for easy integration into existing equipment.  

4. Improve production efficiency

-High transparency can optimize thermal radiation efficiency, reduce energy consumption, and lower production costs.  

-High mechanical strength reduces damage caused by thermal stress and lowers maintenance frequency.  

Customized service

We provide a comprehensive customized solution for quartz furnace tubes, including:

1. Size customization: non-standard diameter, length, conical tube, irregular tube, etc.  

2. Surface treatment: Polishing and coating (such as anti reflective coating) can be carried out according to the needs.  

3. Accessory integration: Install flanges, O-ring grooves, exhaust ports, etc. for easy installation and sealing.  

4. Special process optimization: Adjust the material formula or manufacturing process according to the specific application of the customer (such as ultra-high temperature or ultra-high vacuum environment).  

20-900mm photovoltaic quartz furnace tube is a key component in photovoltaic, semiconductor, and high-temperature processes. With advantages such as high purity, high temperature resistance, and flexible customization, it can effectively improve production efficiency and product yield. We can provide professional technical support and solutions for both standard sizes and special requirements, helping customers achieve more efficient and stable production in the high-end manufacturing field.

If you need further information or customized requirements, please contact our technical team!

Luverre Quartz can manufacture customized quartz tubes in various shapes, such as spiral, square, round, with processing including cutting, bending, welding, etc., and available in different colors, such as transparent quartz tubes, opaque quartz tubes, milky white quartz tubes, red quartz tubes, and so on.