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Vacuum Heat Treatment Furnace

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Carrier materials and refractory properties in vacuum furnaces

In vacuum furnaces, the refractory properties of the carrier material and furnace lining that carry the heating material are crucial. These materials must be able to withstand the harsh conditions of high temperature, vacuum or specific atmosphere, while also having good thermal stability, chemical inertness and sufficient mechanical strength.

Graphite material: Graphite is a common choice for vacuum furnace heating elements and carriers, especially in high-temperature applications. Graphite has good electrical and thermal conductivity, and performs well in inert atmosphere or vacuum conditions and is not easily oxidized.

Metal material: Such as tungsten, molybdenum, etc., these metals have high melting points and good high-temperature strength, suitable for heating elements and structural parts of vacuum furnaces.

Ceramic material: Ceramic materials such as alumina and zirconia have excellent high-temperature resistance and chemical stability, suitable as insulation layers and carrier materials for vacuum furnaces.

Recommended refractory materials for vacuum furnaces

In vacuum furnaces, choosing the right refractory material is crucial to ensure efficient operation and extend the service life of the furnace. Here are some refractory material recommendations based on different temperature ranges:

Alumina hollow ball bricks: Suitable for temperatures below 1400°C, with low thermal conductivity and excellent thermal insulation properties, suitable for energy-saving high-temperature vacuum furnaces.

MgO-ZrO2-SiO2 series chromium-free refractory: For high temperature environments of 1600℃ to 1800℃, this chromium-free refractory is an environmentally friendly and long-life choice with excellent slag resistance and anti-penetration capabilities.

Corundum mullite refractory bricks: Suitable for the temperature range of 1600℃ to 1700℃, with good thermal stability and mechanical strength.

Graphite fiber or graphite felt: In applications requiring higher temperatures (>1800℃), graphite fiber or graphite felt can be used as insulation materials. They have good thermal stability and low thermal conductivity under vacuum conditions.

Alumina silicate board: During the design and construction stage, alumina silicate board is recommended for its excellent thermal insulation performance and easy processing characteristics, and is suitable for vacuum furnace insulation layers in various temperature ranges.

The selection of refractory materials for vacuum furnaces should be based on specific temperature requirements, chemical environment, and cost-benefit analysis. By selecting appropriate refractory materials, it can not only ensure the stable operation of vacuum furnaces at high temperatures, but also effectively extend the service life of the equipment, reduce operating costs, and improve the efficiency and quality of heating treatment.