Products Thermal Equipment Vacuum Hot Press Furnace Vacuum hot press furnace
Vacuum hot press furnace

Vacuum Hot Press Furnace

Vacuum hot press furnace

Item Number : KT-VHP

Price varies based on specs and customizations


Working temperature
1500℃ / 2200℃
Working pressure
10-400T
Press distance
100-200mm
Vacuum pressure
6x10-3Pa
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Applications

Vacuum hot pressing furnace is a complete set of equipment that heats and pressurizes materials under vacuum or atmosphere. According to different materials and heating temperatures, heating elements can be graphite heater, molybdenum heater, and induction heating, etc; and one-way or two-way pressurization can be used for hydraulic pressurization.

Under the high temperature and high pressure and vacuum or atmosphere, the raw material solid particles are bonded with each other, the grains grow up, and the voids (pores) and grain boundaries gradually decrease;Through the transfer of materials, their total volume shrinks, and their density increases, becoming a compact polycrystalline sintered body with a specific microstructure, so that the materials can be pressed and formed.

The density, hardness and other mechanical, electronic and thermal properties of the finished materials can be significantly improved under high temperature and pressure as well as under vacuum or atmosphere

Advantages

  • Hot pressing sintering of metal and ceramic powders;
  • Preparation of ceramic/metal composites and intermetallic compounds;
  • Research and development of diffusion welding process;
  • Densification hot press sintering of oxygen/nitrogen/boron/carbon compounds and their mixtures

Detail & Parts

Vacuum hot press furnace details

  • Double shell structure with water-cooled jacket, the inner shell is made of stainless steel and has been finely polished. Housings are high quality carbon steel with anti-rust treatment or stainless steel with pad blasting.
  • The heating element adopts graphite or molybdenum wire. Heating is divided into 1-phase or 3-phase heating. The rational design of the heating element helps to improve the uniformity of the temperature in the cavity.
  • The furnace can be easily operated through the electrical control system. The temperature and pressure are controlled by PLC analog, or the sintering process is automatically completed by using a temperature and pressure programmable controller. The control system has alarm and protection functions such as water cut off, over temperature and over current.

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Graphite die
Graphite die

Structure introduction

This electric furnace has two types of graphite heating and resistance wire heating, which are suitable for sintering metal powder, inorganic non-metallic materials, etc. under vacuum and high temperature hot pressing; of course, hot pressing sintering can also be carried out under protective atmosphere. In this way, the densification of the material can be completed, deformation can be prevented, and the grain size of the nanopowder can be suppressed.

Specification          
  • The electric furnace is heated by a vertical furnace body (pressure ranges from 5-800T, and the pressurization method is divided into one-way and two-way). The feeding and discharging methods are divided into top and side. , electronic control system and other components.
         
Furnace shell
  • The furnace shell is a double-layer water-cooled structure, the inner layer is strictly polished stainless steel, the outer layer is stainless steel sandblasting matte treatment or carbon steel anti-rust treatment, water cooling is passed between the double layers, and the furnace shell does not exceed 60 °C. The furnace cover is lifted by a mechanical mechanism, manually rotated backwards to open (one-way pressure), and a locking device is installed on the furnace cover.
Stove side
  • The side of the furnace is equipped with an observation window, a thermocouple automatic entry and exit mechanism, an infrared thermometer and a water-cooled electrode (three-phase). The automatic entry and exit of the thermoelectric cell is electric, with high and low temperature automatic switching. In order to prevent accidents caused by abnormal furnace temperature, there is also an over-temperature protection thermocouple on the side of the furnace.
The heating element
  • The heating element is made of graphite tube (or molybdenum wire), which can be divided into single-phase and three-phase heating. The rational design of the heating element improves the uniformity of the furnace temperature.
The insulation layer
  • The insulation layer is made of graphite (or graphite paper), carbon felt, etc., which has good insulation performance, and the unique structural design reduces the vacuuming time. The insulation layer of the molybdenum wire hot pressing furnace is a metal reflective screen.
The vacuum system
  • The vacuum system consists of two-stage vacuum pumps, one oil diffusion pump and one mechanical pump to complete the high and low vacuum. The vacuum valve adopts the high-vacuum baffle valve designed and produced by our company, which can realize automatic switching and control of high and low vacuum with digital display vacuum gauge and PLC.
The main circuit of the electric control system
  • The main circuit of the electric control system is low-voltage and high-current input. The electric control cabinet is made with reference to the standard cabinet of Rittal. It is humanized design. There are graphic simulation screens and buttons on the control panel. The operation is intuitive and convenient. The temperature and pressure control are controlled by imported brand programs. Instrument, the cabinet is equipped with a PLC, and the sintering process is automatically completed near the preset program. The control system has sound and light alarm functions for abnormal phenomena such as water cut-off, over-temperature, over-current, and thermocouple automatic switching failure.

Features

  • Double layer SUS304 stainless steel vacuum chamber structure, jacket cold water circulating cooling method to keep the furnace surface temperature 
  • Double column supporting structure, stable hydraulic press system,pressure can be manual control or automatic control,precise pressure regulating and maintaining
  • Advanced thermal insulation materials with low thermal conductivity and good thermal insulation effect, which can effectively isolate heat and reduce energy consumption
  • The temperature range is wide. A variety of heating elements can be selected, such as graphite, molybdenum, tungsten, induction heating, etc. The temperature can reach 2800 ℃ in a suitable protective atmosphere, which can adapt to hot pressing sintering of different materials;
  • Diversified vacuum system configuration, different vacuum degrees are selected according to the process;
  • A charging and discharging system is provided, which can be used for hot pressing sintering in vacuum environment, inert atmosphere or reducing atmosphere;
  • Humanized configuration, both manual operation and intelligent operation can be realized;
  • One furnace for multiple purposes can be used as a simple vacuum or atmosphere sintering furnace;
  • Diversified optional functional types available, vertical upper discharge, vertical side outlet discharge, one-way pressurization, two-way pressurization, etc.

Technical specifications

Working temperature 1500℃ / 2200℃
Heating element Molybdenum/Graphite
Working pressure 10-400T
Press distance 100-200mm
Vacuum pressure 6x10-3Pa
Effective working area diameter range 90-600mm
Effective working area diameter range 120-600mm

Warnings

Operator safety is the top important issue! Please operate the equipment with cautions. Working with inflammable& explosive or toxic gases is very dangerous, operators must take all necessary precautions before starting the equipment. Working with positive pressure inside the reactors or chambers is dangerous, operator must fellow the safety procedures strictly. Extra caution must also be taken when operating with air-reactive materials, especially under vacuum. A leak can draw air into the apparatus and cause a violent reaction to occur.

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FAQ

What is a vacuum furnace used for?

A vacuum furnace is used for high-temperature processing of materials in a controlled environment without any contamination. It operates by surrounding the product with a vacuum, which prevents oxidation and heat loss from the product through convection. This furnace is commonly used for heat treatment of steel alloys at temperatures below 1200 °C. High-temperature vacuum furnaces can reach temperatures up to 3000°C and are used for industrial processes such as sintering, brazing, annealing, and heat treatment with high consistency and low contamination. The ability to achieve uniform heating across the entire workpiece is a key benefit of using a high-temperature vacuum furnace.

What is the process of a vacuum furnace?

The process of a vacuum furnace involves loading the parts into the chamber and creating a vacuum inside it by utilizing a vacuum pump. The next step is to heat the parts using temperature controls, which can reach between 1,500 and 5,400 degrees Fahrenheit. This process eliminates the possibility of oxidation and contamination, resulting in a higher purity end product. After heating, the parts are cooled and finished before being removed from the vacuum furnace. The furnace consists of various components, including the vacuum system, furnace shell, electric heating element, temperature controls, power supply system, and transport apparatus.

What are the advantages of using a hydraulically heated laboratory press?

Hydraulically heated laboratory presses offer several advantages in scientific research and material characterization. The hydraulic system provides precise and adjustable pressure control, allowing researchers to apply specific pressure levels to samples. The inclusion of a heating element enables precise temperature control, facilitating experiments that require elevated temperatures or thermal treatments. The presses are also versatile and can accommodate a wide range of sample sizes and shapes. They are commonly used for applications such as powder compaction, material synthesis, sample preparation for spectroscopic analysis, and polymer molding. The combination of pressure and heat in a single machine streamlines experimental processes and offers researchers greater control over their experimental conditions.

What is the purpose of a vacuum hot press furnace?

The purpose of a vacuum hot press furnace is to combine vacuum or atmosphere, hot pressing, and high-temperature sintering to form new materials. It can be used in the vacuum sintering of transparent ceramics, industrial ceramics, and metals, as well as the high-temperature sintering of ceramic materials such as silicon carbide and silicon nitride. Additionally, it can be used for the heat treatment of powders and compacts at a temperature lower than the melting point of the main components, which improves their strength through metallurgical combination between particles. The finished materials have improved mechanical, electronic, and thermal properties.

What gas is used in a vacuum furnace?

Different gases can be used in a vacuum furnace depending on the application. In general, vacuum furnaces can work with gases or mixtures such as Argon, Nitrogen, Hydrogen, Carbon Monoxide, Helium, among others. The use of these gases allows for heat treatment in a defined, mostly non-oxidizing atmosphere, which is required for various applications such as vacuum soldering and brazing, vacuum annealing, and sintering. Additionally, it is possible to work with a defined oxygen concentration that is different from the air composition.

What does a hydraulic lab heat press do?

A hydraulic lab heat press is a machine that uses fluid pressure to generate force and heat to melt powdered material and compress it into the desired shape and size for lab applications. It is used to create a wide range of samples, pellets, and test specimens for materials such as polymers, composites, ceramics, and pharmaceuticals. The lab press can be a benchtop or floor unit and can generate from 15 to over 200 tons of compressive force. It has heated platens that can range from 50℃ to 500℃.

What are the advantages of a vacuum hot press furnace?

Advantages of a vacuum hot press furnace include hot pressing sintering of metal and ceramic powders, preparation of ceramic/metal composites and intermetallic compounds, research and development of diffusion welding process, and densification hot press sintering of oxygen/nitrogen/boron/carbon compounds and their mixtures. The high temperature and pressure under vacuum or atmosphere help to bond raw materials solid particles together, decrease voids and grain boundaries, and improve the mechanical, electronic, and thermal properties of finished materials.

What is the heating element used in a vacuum furnace?

The heating element in a vacuum furnace is critical to its proper functioning, and is dependent on factors such as maximum operating temperature, power load, partial pressure and quench gases, and life expectancy. Vacuum furnaces are heated by electric resistance elements made from a variety of materials, including high-temperature metallic alloys such as stainless steel, nickel-chromium, molybdenum, tungsten, tantalum, or of non-metallic materials such as graphite and silicon carbide. The choice of material for the heating element is important in maximizing its longevity, reliability, efficiency, and ultimately the process results.

What types of samples or materials can be processed in a hydraulically heated laboratory press?

Hydraulically heated laboratory presses can process a wide range of samples and materials. They are commonly used for powders, granules, pellets, and other solid forms. The presses are particularly useful for compacting powders into tablets or pellets for subsequent analysis or material characterization. They can also be used for synthesizing materials through processes such as hot pressing or sintering. In addition, the presses can handle materials such as polymers or composites, allowing for molding or shaping experiments. The versatility of hydraulically heated laboratory presses makes them suitable for various applications in materials science, chemistry, geology, and other scientific disciplines.

How does a vacuum hot press furnace work?

A vacuum hot press furnace is a piece of equipment that combines vacuum, hot pressing, and high-temperature sintering. It works by heating and pressurizing materials under vacuum or atmosphere to create a compact polycrystalline sintered body with improved mechanical, electronic, and thermal properties. The furnace is composed of several systems including furnace body, heating and heat preservation, temperature measurement system, vacuum system, air charging system, water cooling system, control system, and pressure system. Heating elements can be graphite heater, molybdenum heater, or induction heating, and one-way or two-way pressurization can be used for hydraulic pressurization.

How does a hydraulically heated laboratory press work?

A hydraulically heated laboratory press operates by combining hydraulic pressure and controlled heat to process samples. The press consists of a hydraulic system that applies pressure to the sample and a heating element that provides controlled temperature. The pressure is generated by a hydraulic pump, which pressurizes a liquid, typically oil or water, in a closed system. The pressurized liquid is then directed to a piston or platen that applies the pressure to the sample. The heating element, often in the form of heated platens or resistance heating, allows for controlled temperature application to the sample. The combination of pressure and heat allows for various processes, such as powder compaction, material synthesis, or polymer molding, depending on the specific experimental requirements.

What are the common applications of vacuum hot press furnaces?

Vacuum hot press furnaces have various applications in industries such as aerospace, automotive, electronics, and materials research. They are used for the production of advanced ceramics, such as ceramic matrix composites and sintered carbides, which are used in high-temperature applications. These furnaces are also utilized for the fabrication of metallic alloys, superalloys, and intermetallic compounds with tailored properties. Vacuum hot press furnaces play a crucial role in the production of diamond tools and cutting inserts, as well as in the development of advanced electronic materials and components. Additionally, these furnaces are employed in research laboratories for the synthesis and processing of novel materials with unique properties.

How can the performance of a hydraulically heated laboratory press be optimized?

The performance of a hydraulically heated laboratory press can be optimized through several means. Regular maintenance is crucial to ensure the machine operates smoothly and accurately. This includes checking and lubricating hydraulic components, inspecting heating elements for wear or damage, and calibrating pressure and temperature sensors as necessary. It is important to follow the manufacturer's guidelines for proper usage and maintenance. Calibration of the pressure and temperature controls should be conducted periodically to ensure accurate and reliable results. Selection of appropriate fixtures or molds for sample preparation is important to ensure uniform pressure application. Collaborating with manufacturers or experts in laboratory press technology can provide valuable guidance and recommendations for optimizing the performance of a hydraulically heated laboratory press.

What factors should be considered when selecting a vacuum hot press furnace?

When selecting a vacuum hot press furnace, several factors need to be considered. Firstly, the size and capacity of the furnace should align with the intended application and production requirements. The furnace should accommodate the size and number of samples or components to be processed. The heating and pressure capabilities of the furnace should also be evaluated to ensure they meet the desired temperature and pressure conditions. It is important to consider the level of automation and control systems available, as well as the compatibility with specific materials and processes. Additionally, the reliability, service support, and overall cost of ownership should be assessed. Consulting with manufacturers and experts in the field can help in selecting the most suitable vacuum hot press furnace for specific processing needs.
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