Vacuum Hot Press Furnace
A Vacuum Hot Press Furnace is a piece of equipment that uses heat and pressure in a vacuum to shape materials. It's used in a variety of materials processing applications.
- Product Introduction
What is Vacuum Hot Press Furnace?
A Vacuum Hot Press Furnace is a piece of equipment that uses heat and pressure in a vacuum to shape materials. It's used in a variety of materials processing applications.
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.
Single Chamber High-temperature Vacuum Sintering Furnace
This single-chamber vacuum sintering furnace has a compact structure, high density, safe and reliable performance, a wide range of applications, and high equipment temperature control accuracy. And we also have perfect after-sales service and technical support, maintenance and repair services.
Vacuum reduction stove is a heating device used to reduce metal or ceramic materials from an oxidized state to elements or metals. It can be used in many industrial processes, such as metallurgy, chemistry, semiconductor manufacturing, glass manufacturing, and ceramic manufacturing.
Vacuum resistance furnace is a type of resistance furnace that is evacuated during heating.
Vacuum glovebox is an experimental equipment widely used in fields such as chemistry, biology, and materials. Its structure is a closed box, equipped with a glove mouth and a vacuum system.
Heat treatment oven refers to a metal hot working process in which a material is heated, insulated, and cooled in its solid state to obtain the expected structure and properties.
High Temperature Vacuum Furnace
High temperature vacuum furnace is an advanced heat treatment equipment that uses high-temperature heating technology in a vacuum environment and can be used for heat treatment, sintering, and annealing processes of various metal and non-metallic materials.
Vacuum Sintering Furnace with Glove Box
Vacuum Sintering Furnace With Glove Box is usually used in the powder metallurgy industry and vacuum sintering of various magnetic materials. Since the furnace is loaded in a protective atmosphere
Single-Chamber Vacuum Sintering Furnace
This single-chamber vacuum sintering furnace has a compact structure, high density, safe and reliable performance, a wide range of applications, and high equipment temperature control accuracy. And we also have perfect after-sales service and technical support, maintenance and repair services.
Vacuum Hot Press Sintering Furnace
Vacuum hot pressing sintering furnace is a kind of production equipment, including sintering furnace and vacuum pumping part. The sintering furnace includes a furnace body and a heating chamber installed in the furnace body.
Components of a Vacuum Hot Press Furnace
Vacuum hot press furnaces are complex systems that consist of various components working together to provide controlled heating and pressurization under vacuum or atmospheric conditions. The primary components of a vacuum hot press furnace include:
Furnace Body, Furnace Door, and Heating Elements
The furnace body houses the heating elements and the material being processed. It is typically made of high-temperature resistant materials such as stainless steel or ceramic. The furnace door provides access to the furnace chamber and is designed to maintain vacuum integrity. Heating elements, which can be graphite, molybdenum, or induction-based, generate the heat required for the process.
Vacuum System and Air Charging System
The vacuum system creates and maintains a vacuum within the furnace chamber. It consists of a vacuum pump, vacuum gauges, and valves. The vacuum pump removes air from the chamber, while the vacuum gauges monitor the vacuum level. The air charging system allows for the introduction of a controlled atmosphere into the chamber, such as nitrogen or argon.
Water Cooling System, Control System, and Pressure System
The water cooling system circulates water through the furnace body to prevent overheating and maintain a stable temperature. The control system monitors and regulates the furnace temperature, vacuum level, and pressure. The pressure system applies pressure to the material being processed, which can be uniaxial or isostatic.
Additional Components
In addition to these core components, vacuum hot press furnaces may also include other features such as:
Temperature Measurement System: Thermocouples or pyrometers measure and record the temperature inside the furnace.
Gas Flow Control System: This system regulates the flow of gases into and out of the chamber.
Data Logging System: This system records and stores process data for analysis and monitoring.
Safety Features: Safety features such as interlocks, alarms, and emergency shutdown systems are essential for safe operation.
Material Processing in Vacuum Hot Press Furnaces
Vacuum hot press furnaces offer a controlled environment for material processing, enabling precise bonding, grain growth, and densification under high temperature, pressure, and vacuum conditions. This process enhances the properties of materials, resulting in reduced voids, grain boundaries, and overall volume shrinkage while increasing density.The primary goal of vacuum hot pressing is to create compact polycrystalline sintered bodies with tailored microstructures. This technique is particularly advantageous for micro-powder products, as it effectively prevents grain growth and ensures the stability of the final product. For instance, in the production of near-nanometer cemented carbide, vacuum hot pressing has proven successful in restraining grain growth, leading to the formation of nanocrystalline products.
Vacuum hot press furnaces are classified based on their pressurization methods:
Uniaxial Hot Pressing
Pressure is applied in one direction, typically perpendicular to the surface of the material.
Isostatic Hot Pressing
Pressure is applied equally from all directions, resulting in uniform densification.
Hot Isostatic Pressing (HIP)
Pressure is applied isostatically under high temperature conditions, promoting densification and eliminating internal voids.
Mechanism and Characteristics of the Hot Pressing Sintering
Sintering is the process of heating a powder to a certain temperature and holding it for a certain amount of time, then cooling the material to obtain a product with the desired properties. The entire process of special heat treatment is called sintering.Sintering turns porous powder briquettes into products with certain textures and properties. From the process characteristics of the sintering process, the sintering of cemented carbide can be done by hydrogen protection, vacuum sintering, hot press sintering, hot isostatic pressing, etc. This article will describe the characteristics of the hot-press sintering process.
Densification mechanism
The process of putting the powder of the final additive into the graphite press mold and sintering and pressing at the same time is called hot pressing.
Although hot pressing is carried out simultaneously with both pressing and sintering processes, there is no difference in principle with ordinary cold pressing molding and sintering. Effectively, hot pressing greatly reduces the time for phase change and formation of alloy. Therefore, it can be said that the hot pressing process is an activated sintering process.
The sintering process during hot pressing is a highly unbalanced process. When the mixture powder is heated continuously under pressure, the oxide film on the powder surface is broken under pressure and can be reduced by carbon. The shrinkage of hot pressed products is different from that of the normal sintering method. In addition, powders with crystal defects can achieve greater alloy density because the presence of defects activates the hot pressing process.
Characteristics of the hot pressing process
The hot pressing process gives unique advantages to its products. Therefore, this process plays a major role in the production of cemented carbide. The main characteristics of this process are.
a. High density and good performance of hot pressed products.
The porosity of the hot-pressed products is extremely low and the density is almost the theoretical value. At the same time, due to the short hot pressing time, the carbide grains will not grow due to the recrystallization process, so the product carbon is finer than tungsten grains, which makes the hot pressed products have higher hardness and better wear resistance, especially suitable for manufacturing precision tools such as precision rolls and high precision wear parts.
b. Small pressing pressure, can produce large products.
The unit pressing pressure required for hot pressing is only about one-tenth of that for cold pressing. In addition, the size of the product can be enlarged by welding, so the size of the hot pressed product is limited by the capacity of the press less than that of the cold press.
c. Products with complex shapes can be produced.
Because of hot pressing, the powder material has thermoplasticity and good fluidity, so it can be made into complex shaped shaped products, such as thin-walled tubes and ball and pillar products. However, for long parts, there is still uneven density, and long parts of welding are often unevenly welded.
d. Large size non-deformed products can be produced.
Hot pressing method overcomes the shortcomings of cold pressing and sintering deformation, and can obtain long pieces without bending and hollow products with relatively accurate dimensions. However, due to hot pressing, cobalt is extruded from the product surface, which not only causes cobalt loss, but also makes the surface of hot pressed products rough and difficult to clean and process.
e. High operation technology requirements.
In the hot pressing process, the combination of temperature and pressure, the speed of heating up and cooling down, and the control of shrinkage play a decisive role in the performance and defects of the product. Therefore, a high level of operator skill is required.
The Difference Between Vacuum Hot Pressing Sintering Furnace And Vacuum Furnace
Vacuum hot pressing sintering furnace is often used for rapid and high-grade sintering of materials such as cermet, composite ceramic, nanophase, gradient function, mesoporous nano thermoelectric, non-equilibrium state of alloy glass and biology.
Vacuum furnaces are often used for magnetic treatment of metal materials.
In addition, the structure of the vacuum hot pressing sintering furnace and the vacuum furnace are also different.
The vacuum hot-pressing sintering furnace includes a sintering furnace and a vacuuming part. The sintering furnace includes a furnace body and a heating chamber installed in the furnace body. The sintering furnace is equipped with six lead electrodes, which are characterized in that they are located on the upper and lower sides of the furnace body. The upper beam of the hydraulic press and the lower beam of the hydraulic press are provided. The upper beam of the hydraulic press and the lower beam of the hydraulic press are connected as a whole by four pillars; the upper pressure head is formed by connecting the upper water-cooled pressure head and the upper graphite pressure head, and the lower pressure head is composed of the lower water-cooled pressure head and The lower graphite indenter is connected, and the upper and lower indenters are inserted into the furnace body from the indenter through holes on the upper and lower end faces of the furnace body and the heating chamber respectively, and the upper graphite indenter and the lower graphite indenter are respectively inserted and heated Indoors, the upper and lower indenters can move up and down.
The vacuum furnace is generally composed of a furnace, an electric heating device, a sealed furnace shell, a vacuum system, a power supply system and a temperature control system.
The shell is welded with carbon steel or stainless steel, and the joint surface of the detachable part is sealed with a vacuum sealing material. In order to prevent the furnace shell from being deformed after heating and the sealing material is heated and deteriorated, the furnace shell is generally cooled by water cooling or air cooling. The furnace is located in the sealed furnace shell. According to the purpose of the furnace, different types of heating elements are installed inside the furnace, such as resistors, induction coils, electrodes, and electron guns. There are crucibles in the hearth of the vacuum furnace for smelting metals, and some are equipped with automatic pouring devices and manipulators for loading and unloading materials. The vacuum system is mainly composed of vacuum pump, vacuum valve and vacuum gauge.
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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