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Tungsten-molybdenum Material for Monocrystalline Silicon Furnace

(Summary description)With high-temperature resistance and low volatility, tungsten-molybdenum materials are widely applied to monocrystalline silicon furnaces and polycrystalline silicon furnaces.

Tungsten-molybdenum Material for Monocrystalline Silicon Furnace

(Summary description)With high-temperature resistance and low volatility, tungsten-molybdenum materials are widely applied to monocrystalline silicon furnaces and polycrystalline silicon furnaces.

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With high-temperature resistance and low volatility, tungsten-molybdenum materials are widely applied to monocrystalline silicon furnaces and polycrystalline silicon furnaces.

Such as hooks, guide cylinders, counterweights, etc.

 

Tungsten-molybdenum Material for Monocrystalline Silicon Furnace

 

Instructions of Single Crystal Industry Accessories:

Tungsten Wire Rope

Tungsten wire rope is also referred to as seeding flexible shaft. If the direction in which the tungsten wire is stranded is the same with the direction in which the strands are twisted into rope, it is called lang lay; if all the strands are twisted rightwards, it is named right lang lay; and if all are twisted leftwards, it is named left lang lay. For this type of tungsten wire rope, tungsten wires contact well with each other. It has smooth surface, good flexibility, low wear and long service life. At the same time, it is easy to loose and twisted If the direction in which the tungsten wire is stranded is opposite with the direction in which the strands are twisted into rope, it is named regular lay. If the rope is twisted rightwards while the strands are twisted leftwards, it is named regular-lay right lay; conversely, it is named regular-lay left lay. The disadvantages of this type of tungsten wire rope are its high stiffness and short service life, but it is not easy to loose or twist. If the direction in which the tungsten wire is stranded is partly the same as the direction in which the strands are twisted into a rope and partly opposite, it is named alternate lay, which has the same features with lang lay and reqularly lar, but the manufacturing process is more complex.

With professional tungsten wire rope-winding equipment, we use alternate lay and make high-strength performance tungsten wire ropes. simulating the operation temperature in the main and subsidiary rooms of the single crystal silicon furnace, providing reliable tensile test data with professional normal temperature & high temperature tensil testing machine, we can provide customers with safe and secure products.

When using tungsten wire ropes, attention should be paid to the following points:

1. The weight of the pulling single crystal bar shall not exceed the rated high temperature working tension the tungsten wire can bear;

2. Before installing the furnace, check the appearance of the surface of the tungsten wire rope and see whether there are burrs, hard scratches, hard knots, hard folds, etc., and check whether the degree of tightness of the tungsten wire rope during winding is even and appropriate. If you find the above defects, you should stop using them immediately;

3. Tungsten wire rope should be handled lightly during installation and use. In case of intertwining, unknot it slowly along the winding direction, be sure not to pull it by force and lead to break;

4. When loading, unloading, and opening or closing the furnace door, be sure to do that until the mechanical part of the equipment has moved to the designated location, so as to avoid collisions or squeezing that may damage the tungsten wire rope;

5. Tungsten wire rope has been recrystallized after it has been used at high temperature, and its brittleness increases at room temperature. Therefore, when loading and unloading, lightly tap the heavy hammers, chucks and other components connected to the tungsten wire rope, so as to avoid serious shock or strike, and prevent damage to the internal structure of the tungsten wire rope, fracture of wire and burrs;

6. When the tungsten wire rope rotates in use, its rotation direction should follow the twisting direction during winding, otherwise the tungsten wire rope will scatter or kink, resulting in broken wire;

7. Before loading the furnace, carefully check whether the above-mentioned defects are caused during the use of the tungsten wire rope. If it is verified that the tungsten wire rope is in good condition, the tungsten wire rope can be used. Otherwise, a new tungsten wire rope needs to be replaced.

Molybdenum Hammer

As one of the most important molybdenum accessories for the thermal field of single crystal growth furnaces, it is mainly used to connect tungsten wire ropes and seeding chucks in an environment around 1450°C. It ensures that the wire ropes are stretched vertically during the pull-up process to prevent deflection and centrifugal movement of the wire ropes. Our molybdenum hammer uses raw materials from well-known domestic companies, and the finished hammer features a smooth surface, no broken screw thread, high finish, shape and position tolerance within the scope of the requirements (CMM). Generally, the size of molybdenum hammers differ due to the size of the furnace, and some single crystal furnace hammers are made of stainless steel 304/316L and molybdenum-antimony alloy.

Molybdenum Draft Tube

Also known as the molybdenum heat preservation barrel, the molybdenum draft tube is placed inside the graphite carbon felt in the single crystal furnace. The actual test results show that the argon gas in the upper part of the single crystal furnace body becomes smooth, the flow of argon gas is accelerated, and the deposition of silicon oxide in the single crystal furnace is greatly reduced. Because of the temperature protection of the molybdenum draft tube, the heating time is reduced, the crystallization time is shortened by nearly 40%, and the occurrence of crystal dislocations is also reduced. Therefore, the application of molybdenum draft tubes reduces energy consumption and improves production efficiency.

The molybdenum draft tube includes plate draft tubes and concave-convex plate molybdenum draft tubes. The concave and convex molybdenum draft tube has a brighter surface, uses less material, and reduces diffuse reflection.

The shape of the molybdenum draft tube is a horn with a big upper mouth and a small lower mouth. Because each manufacturer uses a different furnace type, the current popular molybdenum draft tubes include 20-inch, 22-inch, 24-inch, 26-inch, and 28-inch. Generally 0.5-2.0mm high-temperature molybdenum plates are used for the production and processing of molybdenum draft tubes, which are entirely cut into fan shape according to the drawing size, then heated and rolled into the horn shape for riveting or welding, and finally corrected. Finished molybdenum draft tubes’ surface finish can reach Ra0.8-1.6, and the size is so precise that it can ensure the draft tube can closely match with the graphite carbon felt.

Molybdenum Secondary Feeder

Together with the quartz tube liner, it can avoid reaction between molybdenum and stainless steel with silicon liquid surface under high temperature conditions. It also has high temperature resistance, can protect the quartz liner from being damaged easily due to slight bumps, can be used after repair, etc. Currently, there are stainless steel 304/316 feeders and molybdenum alloy feeders.

Prepare for adding silicon materials into the single crystal /polycrystalline silicon furnace, reduce the process of temperature increase and decrease, increase the crystal pulling weight per furnace, and increase production efficiency.

Welcomes single crystal /polycrystalline silicon manufacturers to order secondary feeders!

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