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Vacuum Brazing Furnace

Vacuum brazing: making diamond tools sharper and more durable

Knowing the “hard core” strength of diamond, even the hardest diamond needs to join hands with other materials to show its strength. How to achieve this unbreakable connection? The answer is – vacuum brazing! Enter this precision welding process now. On the precision stage of industrial manufacturing, vacuum brazing technology is quietly changing the quality and efficiency of products in a “silent but powerful” way. From aerospace to electronic devices, from medical instruments to new energy equipment, this technology is becoming a bridge connecting materials and performance.

1. What is vacuum brazing?
Vacuum brazing is a metal connection technology performed in a vacuum environment. Its core is to use filler metal (brass) with a melting point lower than the base material to melt at high temperature, fill the joint through capillary action and form a strong connection. Unlike traditional welding, vacuum brazing does not require the use of flux, avoids oxidation, carbonization, decarburization and pollution and deterioration, and ensures the cleanliness and strength of the joint.
Its working principle can be summarized as follows: Surface treatment: remove the oxide film and oil stains on the surface of the workpiece by sandblasting, ultrasonic cleaning and other methods to ensure the wetting of the brazing material. Vacuum environment: heating in a vacuum furnace to melt and flow the brazing material, filling the joint through capillary action. Cooling and solidification: after rapid cooling, a high-strength, defect-free welded joint is formed.

2. The core advantages of vacuum brazing: no oxidation and no pollution
The vacuum environment completely isolates oxygen and impurities in the air, avoiding the oxidation reaction and pollution problems common in traditional welding. For example, highly active materials such as titanium alloys and zirconium alloys can also be stably brazed under vacuum conditions. Small thermal impact and controllable deformation Since the brazing temperature is much lower than the melting point of the substrate, the workpiece is heated evenly, the thermal stress is extremely small, and the deformation can be controlled within the minimum range, which is particularly suitable for the manufacture of precision parts. Wide range of applications Vacuum brazing is not only suitable for metal materials (such as stainless steel, aluminum alloy, titanium alloy), but also can connect metals with non-metallic materials such as ceramics and glass, and can even handle complex structures (such as blind holes and narrow grooves). High efficiency and energy saving Vacuum brazing can weld multiple adjacent joints at a time, and there is no need to frequently replace the welding torch and nozzle, which reduces the operating cost. At the same time, it has a high degree of automation and is suitable for large-scale production.

3. Typical application scenarios of vacuum brazing
Aerospace field In precision parts such as aircraft engine combustion chamber casings and satellite structural parts, vacuum brazing technology is widely used to connect high-temperature alloys and ceramic substrates to ensure their stability and durability in extreme environments. Electronics and semiconductor industry Vacuum brazing is used to connect microelectronic components, chip packaging and high-density circuit boards. Its high sealing and pollution-free characteristics meet the strict requirements of electronic devices for purity. New energy and automobile manufacturing In the battery housing, motor housing and heat exchanger of fuel cells in new energy vehicles, vacuum brazing technology improves the lightweight and safety of products through efficient connection. Medical and chemical equipment Precision sensor housings in medical instruments, reactor seals in chemical equipment, etc., all rely on vacuum brazing technology to achieve high-precision and high-strength connections.

4. Future trends of vacuum brazing
With the rapid development of high-end manufacturing technology, vacuum brazing is evolving towards intelligence and greening: process intelligence introduces sensors and AI control systems to achieve precise control of temperature and pressure, further improving welding quality and efficiency. New materials and environmental protection technologies The research and development of new lead-free solders and low vapor pressure alloys, as well as the widespread use of inert gases such as hydrogen and helium, have promoted the dual goals of environmental protection and energy conservation. The integration of multiple fields and the combination of the Internet of Things and big data technologies will enable vacuum brazing to achieve remote monitoring and intelligent maintenance, providing more efficient technical support for intelligent manufacturing. Vacuum brazing technology, with its “vacuum” in its name and “precision” at its core, is gradually becoming an indispensable cornerstone of modern industry.