Can high vacuum electric furnaces perform diffusion?

11-04-2025       Author: KJ technology

High vacuum electric furnaces can perform diffusion, which can achieve processes such as metal atom diffusion welding and material diffusion treatment through the synergistic effect of high vacuum environment and high temperature heating. The following is a specific explanation:

1. The principle of diffusion in high vacuum electric furnace

The high vacuum electric furnace achieves diffusion technology through the following core mechanisms:

Vacuum environment inhibits oxidation:

The vacuum degree inside the furnace can reach 10-3Pa to 10-4Pa, effectively eliminating the interference of air and impurities on the welding or diffusion process, preventing metal surface oxidation, and ensuring direct contact between atoms.

High temperature heating promotes atomic migration:

The temperature inside the furnace can be precisely controlled within the range of metal recrystallization temperature (such as 300 ℃ to 1500 ℃), providing thermal energy through resistance heating and other methods, allowing metal atoms to obtain sufficient energy for diffusion movement.

Pressure assisted elimination of interface gaps:

Some equipment is equipped with pressure systems (such as pneumatic, mechanical or hydraulic systems), which apply static pressure to cause micro plastic deformation of the welding surface, further promoting atomic diffusion and interface bonding.

2. Typical application of diffusion in high vacuum electric furnace

Metal material diffusion welding:

Application scenarios: Solid state welding of metal materials such as stainless steel, high-temperature alloys, and titanium alloys.

Technological advantages:

Avoid the melting solidification process and reduce defects such as hot cracks and pores;

The microstructure of the joint area is uniform and the welding strength is high;

Suitable for high-end fields such as aerospace components (such as turbine blades) and automotive manufacturing.

Material diffusion treatment:

Application scenario: Laminated weaving C f/Al

Preparation of composite materials, coating of crystalline silicon substrates, etc.

Technological advantages:

Under vacuum hot pressing, material gaps are eliminated through diffusion to improve density;

Optimize material organization structure and enhance performance (such as strength and conductivity).

3. Typical equipment parameters for diffusion in high vacuum electric furnaces

High frequency vacuum diffusion welding furnace:

Maximum operating temperature: 1400 ℃

Vacuum degree: on the order of 1.0 × 10-3Pa

Pressure system: maximum output load of 5 tons, equipped with precision pressure servo control device

Heating method: High frequency induction heating, achieving rapid temperature rise

Temperature control accuracy: ± 3 ℃

Application areas: Welding of stainless steel precision components, repair of high-temperature alloy turbine blades, solid-state forming of titanium alloy aerospace components, etc.

High vacuum horizontal tube furnace:

Working temperature: ≤ 1100 ℃ (maximum temperature 1200 ℃)

Vacuum degree: ≤ 8.0 × 10-3Pa

Heating element: high-quality resistance wire

Vacuum unit: 4L/S two-stage pump+TK-200 diffusion pump

Application areas: diffusion welding of metal materials, heat treatment under vacuum or atmosphere, development of carbon nanotubes, coating of crystalline silicon substrates, etc.