Factory Price Bright Molybdenum Crucibles For Sapphire Growing Furnace - Molybdenum heat shield – WINNERS
Factory Price Bright Molybdenum Crucibles For Sapphire Growing Furnace - Molybdenum heat shield – WINNERS Detail:
Product Description
As the heat insulation component in the vacuum furnace, the biggest function of the heat shield is to block and reflect the heat in the furnace. Therefore, high-purity, accurate size, smooth surface, easy assembly, and reasonable design of heat shields are very important.
Molybdenum heat shields are generally produced and processed with 0.5-1.2 mm molybdenum sheets. Generally, there are 4-6 layers. The inner layer of the furnace is made of high-temperature molybdenum TZM material with a thickness of 1.2 mm. Molybdenum strips are used to separate the layers with a space of 7mm. Other molybdenum heat shields are made of 0.5-0.8 mm MO1 material.
The heat shields are generally fixed by means of molybdenum bolt fastening or molybdenum sheet riveting.
Design points of metal heat shield
①Thermal properties of materials
The maximum temperature of the selected metal material should be greater than the environmental working temperature, and the thermal deformation of the metal should be small. When the temperature is higher than 900°C, tungsten, molybdenum and tantalum sheets are generally used. Below 900°C, stainless steel sheet is generally used.
②Material blackness
Choose low blackness material, surface reflection effect is better, higher surface finishes.
③Material thickness
The thickness of the heat shield should be as thin as possible. Molybdenum is generally 0.2 ~ 0.5mm. Stainless steel plate is generally 0.5 ~ 1mm.
④Material price
Under the condition that the working temperature is satisfied, the material cost should be considered, and the cheaper material should be selected.
⑤Determining the number of layers of heat shield
With the increase of the number of layers, the heat loss decreases, the cost increases, the structure is complicated, and the vacuum degree is more difficult to meet working requirements. Increasing to three layers to increase about 8%. The number of layers is not the better, and it should be considered comprehensively. The working temperature is 1000℃, and up to six layers can be used.
⑥Spacing between each heat shield
The spacing should be minimized. The thermal effect of increasing the distance is not large. If the spacing is too small, the two insulation plates will be connected together due to thermal deformation. Reduce the spacing, generally around 10mm.
⑦Connections between layers
Each layer of heat shield should be connected, and the contact area of the connection should not be too large, which will reduce the thermal efficiency. Use bushings and washers to connect each layer.
⑧Maintenance of the heat shield
The heat shield should be designed to be easily disassembled, and the thermal expansion and contraction properties of the material should also be considered.
⑨The distance between the first screen and the radiating surface
Generally 50~100mm
⑩The distance between the outermost screen and the circulating water wall
Generally 100~150mm
Note: We can provide different heat shield assembly solutions for you to choose from, achieving a good balance between practicality and economy.
▎Product Parameters
Products name | Molybdenum heat shield |
Available material | Tungsten、Molybdenum、MoLaTZM、SS304(Stainless steel) |
Thicknes | 0.2~0.5~1mm |
▎Order Information
Inquiries and orders should include the following information:
☑ Drawing of the Molybdenum isolation screen
☑ Material of the screen (W, Mo, Ta or SS304)
☑ Quantity
Product detail pictures:
Related Product Guide:
With our excellent management, strong technical capability and strict quality control system, we continue to provide our clients with reliable quality, reasonable prices and excellent services. We aim at becoming one of your most reliable partners and earning your satisfaction for Factory Price Bright Molybdenum Crucibles For Sapphire Growing Furnace - Molybdenum heat shield – WINNERS , The product will supply to all over the world, such as: Turin, Berlin, Chile, Item have passed by means of the national qualified certification and been well received in our main industry. Our expert engineering team will often be ready to serve you for consultation and feedback. We have been able to also deliver you with cost-free samples to meet your specs. Ideal efforts will probably be produced to deliver you the most beneficial service and solutions. Should really you be interested in our company and solutions, please make contact with us by sending us emails or call us straight away. To be able to know our solutions and enterprise. ar more, you'll be able to come to our factory to see it. We will constantly welcome guests from all over the world to our firm. o build business enterprise. elations with us. You should feel absolutely free to speak to us for organization. nd we believe we are going to share the best trading practical experience with all our merchants.
By Marian from South Africa - 2017.05.02 11:33
Factory equipment is advanced in the industry and the product is fine workmanship, moreover the price is very cheap, value for money!
By Alice from Kazakhstan - 2017.04.08 14:55