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- What are the high-temperature characteristics of ultra-high temperature sintering furnaces
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What is an ultra-high temperature sintering furnace
source：English website | publish time：2025年01月03日1. Working principle
Resistance heating: Using current to generate heat through a conductor (such as a graphite heating element), following Joule's law, which states that heat is proportional to the square of the current, the resistance of the conductor, and the duration of electrification. In some ultra-high temperature sintering furnaces using graphite heating elements, graphite is heated by high current, producing temperatures above 2000 ℃.
Induction heating: It relies on an alternating magnetic field to generate induced current in the heated object, which in turn generates Joule heat for heating. Ultra high temperature induction sintering furnaces are commonly used for sintering metal materials and some ceramic materials. For example, in the preparation of high-performance ceramic matrix composites, induction heating is used to achieve good bonding and sintering between ceramic powder and metal matrix at ultra-high temperatures.
Joule heating: By using Joule heating of electrified carbon materials to form a high-temperature field, a fast heating and cooling rate and ultra-high sintering temperature can be obtained, which can achieve powder synthesis and sintering densification of ceramic materials in a few minutes.
2. Structural composition
Furnace body: A double-layer water-cooled structure is usually used to ensure the stability and safety of the furnace body at ultra-high temperatures, while reducing heat loss.
Heating system: composed of high-performance heating elements (such as graphite heating element, silicon molybdenum rod, etc.), heating power supply, etc., providing an ultra-high temperature environment for the furnace.
Temperature control system: Equipped with high-precision temperature sensors (such as tungsten rhenium thermocouples, far-infrared optical thermometers, etc.) and controllers, it can monitor and adjust the temperature inside the furnace in real time.
Atmosphere control system: including gas supply device, flow control device, gas detection device, etc., can provide different sintering environments such as inert atmosphere and reducing atmosphere according to process requirements.
Vacuum system: composed of vacuum pump, vacuum pipeline, vacuum gauge, etc., used to extract air from the furnace, establish a high vacuum environment, and reduce the influence of impurities.
3. Application Fields
Ceramic materials: used for preparing high-performance ceramics, such as boron nitride ceramics, silicon carbide ceramics, etc., to improve the density, hardness, and mechanical properties of ceramics.
Metal materials: sintering refractory metals (such as tungsten, molybdenum, etc.) and their alloys to improve the material's microstructure and properties, and can also be used for the preparation of metal based composite materials.
Electronic materials: In the manufacturing process of electronic products such as electronic ceramics and semiconductor materials, material densification and performance stabilization are achieved through ultra-high temperature sintering, such as the preparation of multi-layer ceramic capacitors, semiconductor ceramic sensors, etc.
In the field of new energy:it is used for sintering treatment of new energy materials such as photovoltaic materials and lithium battery cathode materials to improve the conversion efficiency and stability of the materials.
4. Technical features
High temperature: The operating temperature is usually above 2000 ℃, and can even reach 3000 ℃, which can meet the sintering needs of refractory materials.
Correct temperature control: able to control the temperature within a high-precision range, with a temperature control accuracy of generally ± 1 ℃, ensuring the stability and consistency of the sintering process.
Fast heating rate: Some ultra-high temperature sintering furnaces, such as Joule heating devices, can reach high temperatures in a very short time (0-10 seconds), with a heating rate of up to 10000K/s.
Controllable atmosphere: The composition, content, and pressure of the furnace atmosphere can be adjusted correctly to meet the sintering requirements of different materials under different atmosphere conditions.
High vacuum degree: It can achieve a high vacuum degree environment, reduce the mixing of impurity gases, and prevent the material from being oxidized or introducing other impurities during the sintering process.
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