PRODUCT CATEGORIES

Vacuum Heat Treatment Furnace

Vacuum Sintering Furnace

Vacuum Brazing Furnace

Why Choose Our High-Temperature Vacuum Furnaces

Vacuum heat treatment is a type of heat treatment process. As long as it involves the field of mechanical manufacturing, heat treatment is a widely used and very important basic process.

Heat-treated metal materials can fully unleash their performance potential, which is very important for reducing energy consumption, improving the intrinsic quality of products, extending product service life, and improving economic benefits.

As long as the materials of mechanical parts and tools and molds are appropriately selected and appropriate heat treatment methods are adopted, their service life can be doubled or even increased by ten times, achieving twice the result with half the effort. For example, important mechanical parts or tools and molds such as bearings, connecting rods, gears, and shafts can all use heat treatment processes.

The heat treatment processes used in high-temperature vacuum furnaces mainly include the following aspects: high-temperature vacuum annealing, high-temperature vacuum brazing, high-temperature vacuum purification, and high-temperature vacuum sintering.

1.High temperature vacuum annealing

This process is to heat the material to above the critical point of annealing temperature, maintain it for a certain period of time, and then slowly cool it to 600°C before air cooling.

The purpose of vacuum annealing includes the following aspects:

(1) Reduce hardness, improve cutting and other mechanical processing properties, and make materials easier to cut and process;

(2) Improve the plasticity of the material and facilitate cold deformation processing;

(3) Refine grains, eliminate structural defects, and improve performance. The structure of workpieces formed by casting, forging, and welding often has defects such as coarse grains, casting segregation, and banded structures. Recrystallization during annealing can eliminate these structural defects and improve performance;

(4) Remove hydrogen to prevent the formation of white spots. Large forged and rolled parts cannot be cooled directly below 200°C after pressure processing. They must undergo dehydrogenation annealing before cooling;

(5) Eliminate stress and stabilize dimensions. Cold stamped parts or machined parts are annealed at low temperature to eliminate stress, stabilize dimensions, and prevent quenching deformation and cracking;

(6) Prepare the structure for final heat treatment.

2.High temperature vacuum brazing

High-temperature vacuum brazing refers to heating the solder (the welding material connecting the parts to be welded) under vacuum conditions to reach the melting temperature, and then utilizing the solidification of the liquid solder and its interaction with the base metal (the metal to be welded). A method of connecting metal parts through diffusion between metal parts.

3.High temperature vacuum sintering

High-temperature vacuum sintering refers to the heating treatment of powder or green compact at a temperature lower than the melting point of the main components under vacuum conditions to improve strength through the connection between particles.

Vacuum sintering has the following advantages:

(1) Vacuum has the function of protective atmosphere;

(2) Vacuum has a reducing effect;

(3) Vacuum has good degassing effect;

(4) The vacuum atmosphere easily promotes wetting of the liquid phase and the solid phase;

(5) Vacuum has the function of activating sintering;

(6) Vacuum sintering can avoid chemical reactions between the protective atmosphere and the sintered body;

(7) Vacuum has the function of purifying materials;

(8) Vacuum sintering can improve the quality of sintered bodies.

Improvements in the quality, control technology and reliability of heat treatment equipment can ensure the quality of heat treatment products, thereby greatly improving the performance of heat treatment products. The important indicators to measure the performance of vacuum heat treatment equipment are the size of the effective working area within the equipment and whether the temperature within the area is uniform.

As a representative high-temperature vacuum furnace for vacuum heat treatment equipment, the overall internal temperature is relatively high during the working process, and the heat energy transfer is mainly based on radiation. There is a gradient in the temperature distribution at each point in the furnace space, which varies with the distance and distance of the point from the heating element. The insulation effect is different, so rationally selecting heating elements and insulation materials, arranging them effectively, and studying the thermal field distribution can make the equipment function better.