Our Round Disc of Tungsten Heavy Alloy Price Per Kg is well-made, with advanced technology, stable performance and easy operation and maintenance. Due to higher molybdenum prices, the cost of the all-metal thermal field also tend to be higher than the thermal field made of other materials.
#Tungsten rounded disk full#
For Full Metal heat should be noted that the molybdenum metal above 1150 ℃, due to the recrystallization of the metal will produce embrittlement, embrittlement of the metal heat shield vulnerable to fall onto the screen above the fixture or workpiece damage. The all-metal thermal field are often applicable to the use of the environment of high vacuum and cleanliness requirements. Due to the reflective properties of the molybdenum sheet, the thermal radiation re-reflection to the workpiece at the center of the thermal field issued from the central area of the thermal field. Full Metal heat insulation performance is good or bad depends on the layers and the spacing between the sheet metal, these intervals is used to prevent heat conduction radiate outward from the center area of the thermal field. If temperatures in excess of 1650 ☌, tantalum sheet can be used to replace molybdenum sheet. If you require a higher operating temperature, the number of layers of molybdenum sheet thickness of each layer should be increased.
Standard vacuum furnace in a 1315 ☌ operating temperature, the heat shields are two layers of molybdenum sheet, outside the three-tier stainless steel sheet within the composition. Molybdenum heat shield has the following characteristics: linear thermal expansion coefficient is small, easy processing, low thermal conductivity, small specific heat. Molybdenum at 1200 ° C is still high strength. Its melting point is 2620 ℃, inferior to tungsten, tantalum, but the density was compared with a much lower specific strength (strength / density) is greater than metals such as tungsten, tantalum, weight very critical applications, is valid.