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Vacuum Heat Treatment Furnace

Vacuum Sintering Furnace

Vacuum Brazing Furnace

Precision technical features of vacuum brazing

The magic moment of vacuum brazing: the titanium alloy shell and ceramic sealing ring of a satellite fuel tank are fused at the atomic level in an oxygen-free environment; the honeycomb structure of an aircraft engine, thousands of micropores are silently filled with liquid brazing material, and the airtightness is comparable to that of a Swiss watch movement.
This technology allows “impossible to connect” materials to cross-border marriage, leaving “hair-precision” parts intact. It is hidden in the wings of large aircraft, and even deep in the skeleton of future space capsules… and its core code is hidden in three keywords: vacuum, temperature, and control.
Vacuum brazing is a process that uses liquid brazing material to wet the base material, fill the joint gap, and form a dense connection through cooling in a vacuum environment. Its core advantage is that it is free of oxidation and flux residue, and is suitable for the connection of high-cleanliness, high-precision and difficult-to-weld materials. It is widely used in aerospace, electronic devices, nuclear energy and other fields.

Technical features of vacuum brazing
1. Non-oxidizing environment, high joint quality without flux: vacuum environment (usually pressure ≤10-3 Pa) isolates oxygen and other active gases, avoids oxidation of base material and brazing material, does not need to use chemical brazing material, and the weld is pure. High cleanliness: no residual brazing agent or impurity pollution, especially suitable for the connection of precision parts (such as electronic components, optical devices). Strength and airtightness: the brazing seam has good density, the joint strength is close to the base material, and the airtightness and corrosion resistance are excellent.
2. Suitable for complex structures and complex geometries of heterogeneous materials: by filling brazing material with capillary action, porous, multi-layer or complex internal structure components (such as honeycomb structure, radiator) can be welded. Compatible with heterogeneous materials: metal and non-metal (such as ceramic-metal) and materials with different thermal expansion coefficients (such as copper-stainless steel) can be connected, which broadens the design possibilities.
3. Controllable thermal process, small deformation and uniform heating: the temperature distribution in the vacuum furnace is uniform, which reduces thermal stress and small deformation of the workpiece, suitable for thin-walled or precision parts. Precise temperature control: Control the heating/cooling rate through the program to adapt to the melting characteristics of different brazing materials (such as nickel-based, silver-based, copper-based).
4. Applicable to high-temperature alloys and active metals that are difficult to weld: titanium alloys, high-temperature alloys, molybdenum, and other easily oxidized or high-melting point materials, reliable connection can be achieved under vacuum.
5. Environmental protection and process stability Green process: No flux volatiles or harmful gas emissions, in line with environmental protection requirements. Good repeatability: Vacuum parameters (temperature, pressure, time) are highly controllable, suitable for mass production, and have high quality consistency.

In view of the technical characteristics of vacuum brazing, the advantages of our vacuum furnace products can be systematically explained from the following aspects, highlighting its technical matching and application value:

Ⅰ. High vacuum environment guarantee
1. Oxidation-free brazing: The vacuum furnace can achieve ultra-high vacuum (≤10-4Pa), completely eliminate oxygen and impurity gases, avoid oxidation of the base material and the brazing material, and ensure the wettability of the brazing material. No brazing flux (such as fluoride brazing flux) is required, and residual corrosion is eliminated. It is suitable for high-cleanliness fields such as aerospace and medical equipment.
2. Efficient control of volatiles: For volatile elements such as Mg, Cr, Si and other volatile elements in the processing process, the vapor deposits can be captured through patented technology to keep the heating chamber clean, increase the vacuum rate and extend the service life of the vacuum pump.

II. Precise temperature control and uniformity
The vacuum furnace thermal field is precisely calculated, designed in three dimensions, simulated in thermal field, etc. The furnace temperature uniformity can meet the requirements of HB5425 Class I and Class II furnaces. Through independent temperature control in one or more zones, different heating chamber materials can be selected according to different products to adapt to different process requirements, such as high-purity graphite, metal molybdenum or tungsten and other heating chamber materials. Through reasonable arrangement of heating elements, the unmelted brazing material or the melting of the parent material caused by local overheating or underheating can be avoided.
III. Material compatibility and process flexibility
1. Multi-material adaptability: It can handle the connection of dissimilar materials and relieve thermal stress through gradient intermediate layer design. It is compatible with highly active materials to avoid oxidation risks in atmospheric environment.2. Complex structure brazing: It supports large-size furnace design and supports batch processing of multiple workpieces.
IV. Energy saving and cost control
1. Low energy consumption design: The use of high-efficiency insulation layer structure can greatly improve thermal efficiency and reduce energy consumption. It can also reduce the deformation of the equipment heating chamber and extend the service life of the heating element through structural design. Large-area heat exchanger and high-quality air duct design can realize fast cooling system and shorten process cycle. 2. Long life and low maintenance: key components have long life, reducing the cost of equipment replacement and maintenance.
Ⅴ. Intelligence and digitalization
For multiple devices used at the same time, centralized management can be achieved. Through the centralized production supervision system, automatic production scheduling, production order management, quality traceability, data collection, report statistics, equipment efficiency calculation, etc. can be realized.

Vacuum Brazing Furnace