Product Series

Molybdenum and Tungsten Materials for Continuous Melting of Quartz

Product Introduction


Tungsten tube and machined die-plate: A tungsten tube and a machined die-plate are assembled into a tungsten crucible in the form of a threaded connection, which are the most important core components of the continuous quartz melting furnace. High purity quartz sand is heated in the tungsten crucible to a high-temperature quartz solution to a maximum temperature of >2200℃. Only quality tungsten materials can ensure the silica sand is fully melted to eliminate encapsulated excess gases and impurities.

Former: The former can draw different specifications of quartz tubes, silica optical fiber drawing rods and quartz plates. Tungsten and molybdenum formers are manufactured by a high density process to improve their deformation resistance. This means that deformation will no occur so easily at long-term high temperatures, providing a reliable guarantee for manufacturing continuous melting products.

Core rod: The core rod is mainly used to fix the former in the melting furnace. Tungsten core rods have high stability to ensure there is no offset, thereby ensuring the uniform thickness and regular shape of quartz products. After forging and machining at a high compression ratio, the length of the core rod can reach up to 2500 mm, with a diameter over 90 mm.

Molybdenum electrode arm: A Molybdenum electrode arm is a conductive device with good strength and ductility at high temperatures as a result of high deformation compressing. It is not prone to deformation and cracking during long-term use. Its grain microstructure appears flat and fibriform. It has much better high-temperature strength and metal fabrication performance than pure sintering products.

Tungsten rod heater: Tungsten rod heaters are heating units for the continuous quartz melting furnace that are longitudinally distributed around the tungsten crucible. They conduct electricity through the molybdenum electrode arm, emit a lot of heat, and radiate on the crucible to fully melt and draw the high purity silica sand inside. Tungsten materials exhibit good strength and hardness, excellent high temperature performance, low resistivity, and a small expansion coefficient. They can be forged into tungsten rods for heating, which significantly improves their high temperature vibration resistance and sagging resistance. For tungsten rod heaters, we provide alkaline wash finish and polished finish for you to choose from, to satisfy the requirements of tube drawing manufacturers.

Molybdenum ring: Molybdenum rings are divided into upper and lower molybdenum rings. Upper molybdenum rings, in which the inner circle is machined into screw threads, is connected to the outer circle of the flange on the tungsten crucible so that it can be suspended. Both weights of the whole tungsten crucible and raw quartz material are concentrated on the molybdenum ring; holes are punched uniformly on the end surface of the lower, and the tungsten rod heater can be inserted in the holes and suspended at the lower end of the tungsten crucible to function as a lower electrode. The lower molybdenum ring does not play a role in hoisting and bearing, but its deformation resistance is fully tested by means of ring punching and long-term high-temperature operating conditions.

Product Application

The tungsten crucible for the continuous quartz melting furnace and supporting materials produced by ATTL can be used to draw semiconductor grade large-diameter quartz tubes, PV grade large-diameter quartz tubes, transparent quartz tubes, UV block quartz tubes, ozone-free quartz tubes, milky quartz tubes, optical fiber preforms, and quartz plates.

Products are widely used in semiconductor/PV quartz boats, diffusion furnaces, UV block germicidal lamps, infrared heat lamps, advanced automotive lamps, optical communication fibers, and targets for optical coating.

Product Specifications

All specifications and sizes of products can be designed and fabricated according to customer demands.

Fabrication Process

Company Advantage

As one of the first Chinese enterprises to be involved in the research and production of tungsten-molybdenum materials, ATTL has inherited CISRI's more than 70 years of experience in the research and production of tungsten-molybdenum materials.

Since the 1990s, we have participated in the localization process of quartz tube drawing, breaking through import monopolies and witnessing successive innovations in tungsten crucibles for the continuous quartz melting industry.

Can be fully customized according to customer requirements; sufficient and stable capacity to support the development of quartz tube drawing enterprises.

Advanced tungsten molybdenum densification technology allow the corrosion and deformation resistance of tungsten to be taken to the limits, reducing furnace shutdown frequency and maintenance, and even putting an end to foaming in quartz tube drawings.

Tools and equipment for producing high-quality quartz for the whole continuous quartz melting industry can be individually tailored, while the company boasts the necessary production experience for all manner of furnaces; supports the full supply of tungsten-molybdenum materials and fittings required for continuous quartz melting furnaces.

These high-purity tungsten-molybdenum materials will not contaminate the quartz, while the service life of a single set of 350 model tungsten tubes can be up to 17 years, setting a benchmark for the industry.

Advanced technology for a leading global position. The company boasts a wealth of experience in large-scale tungsten tube production, providing customers with ultra-large Φ1000 × 1300 mm single tungsten tubes, meeting industry demands for solar PVs, semiconductors, and fiber optic communication.

Contact Information

Wang Meng


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