High Temperature Brazing Vacuum Furnace
High temperature vacuum brazing furnaces are mainly used for brazing of copper, nickel, gold, stainless steel, high temperature alloys, especially heat resistant alloys with high aluminum and titanium content.
- Product Introduction
What is High Temperature Brazing Vacuum Furnace?
High temperature vacuum brazing furnaces are mainly used for brazing of copper, nickel, gold, stainless steel, high temperature alloys, especially heat resistant alloys with high aluminum and titanium content.
Why Choose Us
Various Vacuum Equipment
We can produce various types of vacuum equipment, such as vacuum heat treatment furnaces, vacuum brazing equipment, vacuum nitriding equipment, vacuum crystallization equipment, vacuum storage cabinets, ultra-high purification equipment, vacuum dryers, etc. These products are widely used in materials, aerospace, pharmaceutical and chemical industry, metallurgy, electronics, machinery and other fields.
First-class Production Technology
Our company is a national high-tech enterprise with independent intellectual property rights. In addition, we have dozens of patents and multiple corporate honorary certifications, such as "National High-tech Enterprise", "Provincial Green Manufacturing Factory" and other titles.
Rich Market Experience
Currently, we have served more than 500 customers and have been widely praised. In addition to the fully covered domestic market, some of our products have been exported to many countries in Asia, South America, North America, Europe and other regions.
Multiple International Certifications
We have obtained several international certifications. These include ISO9001-2015 new version quality system certification, 14001 environmental management system certification, 45001 occupational health and safety management system certification and EU CE certification.
Vacuum Hot Press Sintering Furnace
A vacuum hot pressing furnace is a device that implements a hot pressing sintering process on materials. Vacuum hot pressing sintering is to apply a certain pressure to the sample under a certain vacuum and high temperature environment, so that the particles in the powder body of the embryo body are also subjected to the action of mechanical force at the same time as the high temperature, which promotes the contact of different powder particles in the embryo body.
High Temperature Brazing Vacuum Furnace
High temperature vacuum brazing furnaces are mainly used for brazing of copper, nickel, gold, stainless steel, high temperature alloys, especially heat resistant alloys with high aluminum and titanium content.
Vacuum Aluminum Brazing Furnace
It is widely used in aluminum brazing products such as aluminum plate-fin heat exchangers, automobile radiators, automobile air conditioner evaporators, condensers, radar network antennas and waveguides. Widely used in automotive, electronics, national defense, aerospace, aviation fields.
For Vacuum Brazing, the most common application is to use the heat flux capacity of aluminum and the deoxygenation characteristics of the process to connect some special parts, such as assembly components for heating and cooling, microchannel heat exchangers, aircraft components, sensors, medical equipment, structural components, and other heat related products.
Ceramic Vacuum Brazing oven is a brazing process in which the assembled brazing material is placed in a vacuum furnace for heating. The vacuum brazing furnace includes a pressure vessel with a cylindrical side wall and a door, and the size and position of the door are designed to close one end of the cylindrical side wall. When vacuum brazing, when the true vacuum is 0.133Pa, it only contains 10-6% residual gas, which can prevent the interaction between oxygen, hydrogen, nitrogen and the base metal.
Vacuum diffusion welding furnace is a solid state welding process, in which the surface to be welded is subjected to a vacuum environment, a certain temperature range, and pressure to achieve relatively rapid atomic diffusion, thereby achieving metallurgical bonding
Vacuum Brazing Stainless Steel Furnace For High Temperature
Vacuum Brazing Stainless Steel Furnace for High Temperature is a very mature and perfect vacuum heat treatment equipment, its excellent performance and unique design provide a wide range of applications, the main uses; stainless steel, superalloys, non-ferrous metals, hard alloys and special-shaped non-standard parts of vacuum brazing technology.
Brazing equipment vacuum furnace is mainly used for the synthesis or welding of some precision instruments, such as aerospace equipment, especially engines. Below, we will introduce the structure and operating principle of a vacuum brazing furnace.
Vacuum Brazing Process Equipment
Vacuum brazing process equipment is particularly suitable for connecting geometrically complex and precise components, mostly composed of materials such as aluminum or titanium, and the brazing process does not produce pollution. When brazing large-sized parts, it is sometimes more popular than hydrogen atmosphere because it can purify closed and tightly fitted areas.
Understanding the Advantages of Furnace Brazing
The innovative vacuum furnace brazing process offers several compelling benefits over traditional brazing methods, making it a superior choice for various industrial applications. Here's an expanded look at these advantages:
Exceptional Quality and Uniformity
In vacuum furnace brazing, the absence of air and the controlled environment prevent oxidation and contamination, leading to cleaner and stronger joints.
Uniform heat distribution ensures consistent brazing quality across the entire piece, which is crucial for complex assemblies and high-precision components.
Enhanced Strength and Durability
Joints created by a brazing vacuum furnace are notably stronger due to the even distribution of brazing filler, reducing weak spots.
This method enhances the product's lifespan, offering better resistance to thermal and mechanical stresses.
Cost-Effective and Efficient
The vacuum furnace brazing process reduces material waste and energy consumption, which leads to significant cost savings.
Minimizes the need for post-brazing treatments, further reducing production time and costs.
Eco-Friendly Approach
Generates fewer emissions and requires less energy, aligning with sustainable manufacturing practices.
Helps industries meet environmental regulations and reduce their carbon footprint.
Versatility in Applications
Suitable for various metals and alloys, vacuum brazing applications extend across many sectors, including aerospace, automotive and medical devices.
Allows for joining dissimilar materials, offering greater design flexibility and innovation in product development.
Precision and Control
The ability to precisely control temperature and environment in vacuum brazing allows for intricate and delicate metal joining, which is essential in high-precision industries.
Ensures minimal distortion and shrinkage, crucial for maintaining dimensional accuracy in complex components.
The vacuum furnace brazing process is a critical method for joining metal components in various industries, ensuring strong, clean, and precise joints. The process involves meticulous cleaning and preparation of parts followed by precise assembly and fixturing techniques to achieve reliable brazing results.
Cleaning and Preparation
The initial step in the vacuum furnace brazing process is the thorough cleaning of the parts to be brazed. This cleaning is essential to remove any contaminants such as oil, grease, or oxides that could compromise the quality of the brazed joint. Common methods employed for cleaning include ultrasonic cleaning, vapor degreasing, or chemical etching. Proper cleaning ensures the surfaces are free from impurities, allowing for a strong metallurgical bond during brazing.
Assembly and Fixturing
Once the parts are cleaned, they are assembled and fixtured to maintain precise alignment and spacing during the brazing process. Proper fixturing is crucial to ensure that the parts are held securely in place and that they do not move or shift during heating and cooling. Fixtures are typically made from materials with low coefficients of thermal expansion to prevent distortion during the brazing cycle. Additionally, fixtures should not react with the base metals or the brazing filler metal to avoid any contamination issues.
By following these essential steps of cleaning and preparation, as well as meticulous assembly and fixturing techniques, the vacuum furnace brazing process can consistently produce high-quality joints with minimal voids and excellent mechanical properties. This process is vital for creating leak-proof joints in various applications such as heating and cooling assemblies, aircraft components, sensors, and medical devices.
Applications of Vacuum Brazing Furnace Technology
Vacuum brazing technology has evolved significantly since its inception in the 1940s, becoming a cornerstone welding method across various industries. Originally utilized in the electronics sector for brazing copper and stainless steel parts, its application swiftly expanded to encompass critical sectors such as aviation, atomic energy, and the production of stainless steel plate-fin heat exchangers.
Aviation/Aerospace
The aerospace manufacturing sector demands cutting-edge technology to meet exacting specifications for aircraft, guided missiles, space vehicles, propulsion units, and related components.
Medical Device Manufacturing
Precision is paramount in crafting components for electronics and medical devices to ensure optimal fit and safety.
Advanced Ceramics
The high-temperature firing of ceramics is crucial in numerous applications. Industrial kilns play a pivotal role in refining and modifying ceramics to meet diverse requirements, including the production of components for aerospace and defense applications.
Vacuum Brazing Applications
Vacuum brazing finds extensive use in leveraging the thermal conductivity of aluminum and the deoxidizing properties of the process to join components across various domains, including:
● Heating and Cooling Assemblies
● Micro-channel Heat Exchangers
● Aircraft Components
● Sensors
● Medical Devices
● Structural Components
Design of Heating Chamber of High Temperature Vacuum Brazing Furnace
Brazing is a welding technology that uses a solder with a lower melting temperature than the base metal, adopts an operating temperature lower than the solidus of the busbar and higher than the liquidus of the solder, and connects the base metals together through the molten solder.
The vacuum brazing furnace is a heating equipment that uses resistance heat as a heat source for vacuum brazing. The vacuum brazing furnace heats evenly, the deformation of the weldment is small, no flux is required, and no cleaning is required after welding. The quality of the brazed products is high and can be easily brazed. It has been widely used in aerospace, aviation, automobile, refrigeration, electronics and other fields.
We discovered the problem of insufficient temperature during a process. The brazing process is briefly described as follows:
(1) Preparations before welding: Remove the surface oxide scale and degreasing and cleaning (sandpaper).
(2) Parts assembly and positioning.
(3) Filling solder: CO50NiCrWB.
(4) Selection of process parameters: The cold vacuum degree is 8×10-3Pa, the working vacuum degree is 1×10-2Pa, and the melting point of the solder is 1087℃~1149℃. The specific temperature requirements are as follows: at a speed of 350℃/h Raised to 350 °C ± 10 °C, hold for 20 min; raised to 1 000 °C + 10 °C at a rate of 600 °C/h, held for 30 min; raised to 1180 °C ± 10 °C at a speed of 600 °C/h, held for 15 min~ 20 min; filled with argon, cooled to 100 °C, opened the furnace and reclaimed the material.
According to this, the process is soldered, and it is found that the solder is not completely melted when the furnace is opened. After repeated research on the brazing process, it is found that in order to obtain a good brazed joint in vacuum brazing, the following issues must be paid attention to: First, the brazing temperature and holding time. The brazing temperature is a very important factor in brazing, which is mainly It is selected according to the melting point composition, shape, joint form, part size and brazing space position of the solder. Generally, increasing the brazing temperature is beneficial to improve the wettability of the solder and the degree of interaction between the solder and the base metal, so it is beneficial to obtain a solder joint with rounded corners that is uniform, smooth and firmly bonded.
Second, the holding time is also an important factor affecting the quality of vacuum brazing. The purpose of holding the heat is to make the brazing filler metal flow sufficiently, so that the brazing filler metal and the base metal can have a sufficient degree of mutual diffusion to enhance the bonding strength of the joint. The holding time is mainly determined according to the size, quantity and solder composition of the workpiece. Generally, when the number of large workpieces and workpieces is large, the holding time should be longer, but the holding time should not be too long to avoid the loss of solder. In addition, in the vacuum state, the temperature of the heated workpiece lags behind the furnace temperature, so the determination of the holding time cannot be ignored.
According to the analysis, due to the perennial use of the equipment, the phenomenon of heat leakage occurs, and the constant temperature of the workpiece is not enough, resulting in the failure of brazing. It can be seen that the temperature index has become the focus we need to overcome, and the heating chamber is the core structure to maintain the temperature. Therefore, we have systematically researched and summarized the heating chamber from theoretical calculation to practical experience on how to reach a high temperature of 1300℃.
The overall structure of the equipment:
Heating chamber design
Working principle
The brazing heating chamber is located in the vacuum chamber, and the workpiece to be processed is placed on the support frame in the heating chamber. The controlled low-voltage and high-current alternating current passes through the electrodes to make the heating element generate resistance heat, and the reflection effect of the radiation screen is used to concentrate the heat and make the heating The room temperature rises, and the temperature is controlled by the automatic temperature control system to make the temperature reach the set value. A uniform temperature environment is formed in the heating room, and the welding components are heated. According to the user's brazing process requirements, the process can be completed automatically or manually according to the program.
Main structure
The heating chamber is placed in the furnace and consists of a jacket and an inner liner. The jacket is designed to form a strong cold air duct, and the bottom is equipped with 4 rollers. The entire heating chamber can move along the front and rear guide rails in the furnace shell, so that the heating chamber can be pulled out for maintenance.
Liner design
The interior of the vehicle shooting screen is composed of a door screen, a side screen and a bottom screen. In order to ensure that the temperature door screen and the side screen and the bottom screen and the side screen are connected by steps. If the outer diameter of each layer of the two screens is flush with the inner diameter of the side screen, a heat leakage area will be formed at the junction; if the outer diameter of each layer of the two screens is flush with the outer diameter of the side screen, the screens will deform at high temperature , squeeze each other, and a serious heat leakage area will be formed at the junction. At the same time, it is necessary to leave an appropriate distance between the two screens and the side screen for the extension space during high temperature deformation. It has been proved by several equipments that this method greatly improves the thermal insulation performance of the body.
Our Factory
Since its establishment, Hengjin Vacuum has produced over 1000 types of vacuum equipment, including high vacuum sintering furnaces, high-pressure gas quenching furnaces, high vacuum brazing furnaces, high negative pressure annealing furnaces, vacuum tempering equipment, vacuum nitriding equipment, vacuum crystallization equipment and vacuum rapid quenching equipment, vacuum storage cabinets, vacuum operation boxes, vacuum dryers, etc. The products basically cover the entire province of China and are widely used in fields such as materials, IT, metallurgy, machinery, etc. At present, Hengjin Vacuum has more than 500 customers, and some of its products have been exported to multiple countries such as Asia, South America, North America, and Europe.
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