Ultrahigh temperature tungsten rod heater

Abstract

The invention discloses an ultrahigh temperature tungsten rod heater. The ultrahigh temperature tungsten rod heater comprises a tungsten flange and a plurality of tungsten rods which are made of metal tungsten, wherein the tungsten consists of a plurality of arc-shaped units; the arc-shaped units are divided into a first group and a second group which have the same number and are distributed along two semicircles; each tungsten rod comprises a first straight section, a second straight section and a U-shaped transition section; the transition section is connected between the first straight section and the second straight section; each first straight section and each second straight section are vertically and fixedly arranged in the arc-shaped units of the first group and the second group; the whole heater takes the shape of a cage; and each arc-shaped unit extends radially outwards to form an electrode leading out terminal made of the metal tungsten. According to the design, the copper electrode is changed into the tungsten electrode, so the ultrahigh temperature tungsten rod heater has the advantages that 1, water cooling is not required and heat loss is eliminated; 2, high temperature is realized by low power and electric energy is saved; 3, hidden danger of explosion is avoided; 4, the structure is simple and cost is reduced; and 5, materials are saved and the process difficulty is reduced.

Description

technical field [0001] The invention relates to a tungsten rod heater for ultra-high temperature. Background technique [0002] At present, sapphire crystal growth furnaces widely use copper electrodes leading to tungsten rod heating elements. Since the sapphire crystal growth process is maintained at around 2200°C for a long time, a water-cooled structure is adopted to protect the copper electrodes (see attached figure 1 and attached figure 2 In the structure shown, the two ends of the tungsten rod 1' are respectively installed on two copper flanges, and each tungsten rod 1' includes a first straight section 101', a second straight section 102' and a transition section 103', and the corresponding first The straight section 101' and the second straight section 102' are respectively provided with arc-shaped fixing rods 3', and then the copper half-ring electrodes 2' are respectively installed on the two copper flanges, and the copper half-ring electrodes 2' are installed i...

AI Technical Summary

Problems solved by technology

Since the sapphire crystal growth process is maintained at around 2200°C for a long time, a water-cooled structure is adopted to protect the copper electrodes (see attached figure 1 and attached figure 2 In the structure shown, the two ends of the tungsten rod 1' are respectively installed on two copper flanges, and each tungsten rod 1' includes a first straight section 101', a second straight section 102' and a transition section 103', and the corresponding first The straight section 101' and the second straight section 102' are respectively provided with arc-shaped fixing rods 3', and then the copper half-ring electrodes 2' are respectively installed on the two copper flanges, and the copper half-ring electrodes 2' are installed inside the copper half-ring electrodes 2'. There are cooling water channels), the problems it brings are: 1. Larger heat loss; 2. Higher power is required to maintain the temperature; 3. The copper electrode water cooling structure will cause safety hazards in high temperature (if there is a sudden power failure and the water supply is not enough) Sufficient, the copper electrode will have an instantaneous temperature too high, the water vapor pressure in the water-cooled electrode will increase sharply, and an explosion accident will occur); 4. In order to protect the copper electrode, the required structure of the insulation screen 4' is also special, including the circumferential wrapping The insulation screen wrapped around the outside of the heater, and a layer of insulation screens with matching shapes are added on the upper and lower sides of the copper electrode, which increases the difficulty of the process and increases the cost

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