Manufacture of High Temperature Resistant Tungsten Heater

Tungsten is China's advantageous resource. China's reserves and consumption rank first in the world. However, the high value-added high-end products of tungsten products are monopolized by foreign companies, especially tungsten heating elements and supports used in high temperature environments. Mainly relying on imports, domestic imitation products are poor in thermal stability, easy to deform, short in life and limited in application.

With the development of modern industry, more stringent requirements have been put forward for the performance of various high-end sintering furnaces, electronic sources, ion sources and other high-tech equipment and devices. As the key components of such equipment, the performance of tungsten heater and tungsten support directly affects the application of devices. The failure mode of tungsten heater is mostly structural deformation. As a result, the temperature difference of the furnace increases and the quality of the product decreases, so it is necessary to replace a new heater or a new high temperature furnace.

In order to improve the performance of tungsten heater or supporting parts and make them have longer service life, some scholars have added zirconia to make high temperature tungsten heater alloy materials by the following methods:

Configuration of mixed powder containing 0.02% zirconia, i.e. 2 grams of 2,000 mesh zirconia powder mixed with 9.998 kg tungsten metal powder with an average size of 2 microns, using V-type mixer, mixing time 20 hours, mixing drum speed 40 rpm, and every 3 hours, stop 0.5 hours.

The tungsten zirconium powder with uniform mixing was cold isostatically pressed at a pressure of 190 MPa to form a rod blank having a diameter of 17 mm, and the rod was kneaded in a medium frequency induction sintering furnace, sintered to 2500 ° C, and kept for 12 hours. After blanking, 203 rotary forging, 202 rotary forging, and 201 rotary forging, it is processed into a variety of filaments or ribbons after being subjected to multi-pass drawing and rolling.

By adding a dispersion-strengthened high-temperature stable phase ZrO2, the dislocations are pinned in a high-temperature environment, thereby improving the thermal creep resistance of the material, and the produced tungsten alloy material system has better heat resistance and can be used. The heating element parts or support members in a high temperature environment have the characteristics of long working life, easy preparation, and the application prospect is broad.

• < Prev
• Next >