Three Zone Tube Furnace

The three zone tube furnace can be set up according to the needs of different temperature areas,that is,high,medium and low three different temperature ranges.This allows users to perform a variety of process operations,such as melting metals,solid-state reactions,evaporating substances,etc.,in a single large diameter ceramic or quartz tube without having to replace the entire heating system.

 Heating element and structure

Heating element:This device usually uses multiple groups of resistance wires or other types of conductors as heating elements. These elements are placed in large-diameter ceramic or quartz cylinders, specially designed to conduct and disperse heat evenly.

Furnace structure:The shell of the furnace is made of metal Q235 mild steel,and the surface is coated with electrostatic resistance to improve corrosion resistance.Inside,there are multiple temperature control areas to meet different process requirements.

 Importance of sintering and densification of ceramic materials

Sintering and densification of ceramic materials are the key steps in the ceramic manufacturing process.Through this process,the ceramic material can form a dense microstructure,thereby improving its physical,mechanical and thermal properties.This is essential for the application of ceramic materials in electronics,construction,aviation and other fields.

 Application in ceramic sintering

 Temperature control

The three zone tube furnace can precisely control the temperature in different areas of the furnace to adapt to the temperature gradient requirements during the sintering process of ceramic materials.

Through the precise temperature control system,it can ensure that the ceramic material in the sintering process to obtain the best temperature environment,so as to achieve a good sintering effect.

 Atmosphere control

The atmosphere has an important influence on the sintering process of ceramic materials.The three zone tube furnace can adjust the atmosphere in the furnace according to the need,such as the use of inert gas or reducing gas.

A suitable atmosphere environment helps to remove impurities and gases in ceramic materials and promote sintering and densification of materials.

 Uniform heating

The heating element of the equipment usually adopts advanced heating technology such as resistance heating or induction heating to ensure uniform temperature distribution in the furnace.

Uniform heating helps to reduce the temperature gradient of the ceramic material during sintering,thus achieving a more uniform sintering effect.

 Efficient production

It is usually highly productive and can handle multiple ceramic samples at the same time.

This helps to reduce production costs,improve production efficiency,and meet the needs of large-scale production.

 Process and mechanism of sintering and densification of ceramic materials

Sintering process:

 The sintering process of ceramic materials usually includes three stages:preheating,sintering and cooling.

 In the preheating stage,the ceramic material gradually heats up to the sintering temperature.

 In the sintering stage,the ceramic material is subjected to biochemical reactions and physical changes at high temperatures to form a dense microstructure.

 During the cooling phase,the sintered ceramic material gradually cools to room temperature.

Densification mechanism:

 The densification of ceramic materials is mainly achieved by diffusion and rearrangement between particles.

 At high temperature,the surface of the ceramic particles can be reduced,the diffusion and rearrangement between the particles occur,and the dense microstructure is formed.

 At the same time,defects such as pores and cracks in ceramic materials will gradually reduce,thereby improving the density and strength of the material.

 Advantages and challenges of sintered ceramic materials

Advantages:

 The equipment has precise temperature control and atmosphere control capabilities to ensure optimal environmental conditions for ceramic materials during the sintering process.

 The uniform distribution of the temperature in the furnace helps to reduce the temperature gradient in the sintering process,thus improving the uniformity of the sintering effect.

 It is usually highly productive and can meet the needs of large-scale production.

Challenge:

 The sintering process of ceramic materials usually needs to be carried out at high temperatures,which puts forward higher requirements for the material and structural design of the equipment.

 The gases and impurities generated during the sintering process need to be discharged in time to avoid adverse effects on the quality of ceramic materials.

 The sintering effect of ceramic materials is affected by many factors,such as raw material quality and sintering process parameters,so strict process control and optimization are needed.

 Initial heat treatment:In the preparation process,such as the preparation of PZT(lead zirconate titanate)colloidal film,heat treatment is first performed to remove solvents and organic matter in the film.This step is usually performed in a lower temperature region,leaving the colloidal film in a thermodynamically unbalanced amorphous state with a higher energy.

 Densification mechanism:

 Cooling and curing:After annealing,the material is cooled to room temperature so that it cures and maintains a stable structure.

Periodic repeated treatment:The thickness of the colloidal film is gradually increased by periodically repeating the process of homogenization,heat treatment and annealing.A certain number of layers(such as five layers)per uniform is annealed once,usually in a higher temperature region.The annealing process can release the energy of the colloidal film,transform to the crystalline state,and obtain the dense and crystallized film layer.

 

Cooperation background

With the development of science and technology,the research of universities in the fields of material science,chemistry,physics and so on is getting deeper and deeper,and the demand for experimental equipment is getting higher and higher. As a high-precision and multi-functional heat treatment equipment,the three-temperature tube furnace has become an indispensable part of the laboratory in colleges and universities.Through cooperation with professional equipment manufacturers,institutions of higher learning can obtain advanced experimental equipment and improve the level of scientific research.

 Cooperation case

 IDRR Wuxi Aidi Thermal Engineering and Zhejiang University:In September 2024,IDRR Wuxi Aidi Thermal Engineering and a laboratory of Zhejiang University reached a cooperation to build a joint laboratory.IDRR Wuxi Aidi Thermal Engineering is committed to the development and research of pipe furnace and other hot processing equipment and casting auxiliary materials,and its products are highly compatible with the research direction of Zhejiang University laboratory.The two sides have jointly promoted the new development of heat treatment technology through cooperation.

 Dalian University of Technology:Dalian University of Technology has purchased an open-type small three-temperature zone tube furnace for laboratory research.The equipment has the characteristics of high precision and multi-function,which provides strong research support for the researchers of Dalian University of Technology.

 Cooperative significance

 Enhance the level of scientific research:Through cooperation with professional equipment manufacturers,institutions of higher learning can obtain advanced experimental equipment and technical support,so as to enhance the level of scientific research.

 Promoting technological innovation:Cooperation models such as co-building joint laboratories can promote resource sharing and complementary advantages between institutions of higher learning and equipment manufacturers,and jointly promote technological innovation and achievement transformation.

 Training scientific research talents:By participating in cooperative projects and receiving professional training,researchers in universities and colleges can continuously improve their professional quality and practical ability,and contribute to cultivating more excellent scientific research talents.

Preparation before inspection

 

Power off treatment

Before checking the heating element, be sure to disconnect the power first to ensure safety.

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Protective measures

Wear protective gloves and glasses to avoid injury during the inspection.

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Check the steps

1. Appearance inspection

 Check heating elements (such as resistance wires, silicon carbon rods, etc.) for obvious breakage, deformation, discoloration or damage. Fracture is usually a discontinuous place, deformation may appear as bending, distortion and other abnormal shapes, discoloration may be due to overheating or abnormal color changes after long-term use, damage may be due to external force impact and other reasons caused by the surface damage of the component.

 Check the connection part of the heating element, such as terminal, fixing fixture, etc., is firm, there is no loosening, falling off or oxidation phenomenon. Loosening or falling off may lead to poor contact and affect the heating effect; Oxidation may increase resistance, reduce heating efficiency, and even cause failure.

2. Temperature check

 During the heating process, observe the change of the temperature display value. If the heating element is working normally, the temperature should gradually rise as the heating time increases and remain relatively stable after reaching the set temperature. If the temperature rises slowly, stagnates or fluctuates greatly, there may be a problem with the heating element.

 Temperature measurement tools such as infrared thermometer are used to directly measure the temperature on the surface of the tube or near the tube. Under normal circumstances, the temperature at different locations should be distributed within a certain range and correspond to the value of the temperature display instrument. If the temperature in some areas is significantly low or high, it may be that the heating element in the area is not working properly.

3. Electrical parameters check

 Use ammeter and voltmeter to measure the working current and voltage of the tube furnace heating element. The measured values are compared with the rated current and voltage of the device. If the current is too low, it may be partially damaged or poor contact with the heating element; If the current is too high, there may be a short circuit or other abnormal conditions. At the same time, pay attention to the stability of the current and voltage, a large fluctuation may mean that the heating element is not stable.

 For tubular furnaces with three-phase power supply, check whether the three-phase current is balanced. If the three-phase current is not balanced, there may be a problem with the heating element of one phase.

4. Power check

 According to the power calculation formula of tubular furnace (power = current × voltage × power factor), the actual power consumption of heating element is calculated. Compared with the rated power of the equipment, if the actual power is significantly lower than the rated power, it may be that the heating element is damaged or not working properly.

5. Sound check

 During the operation of the tube furnace, carefully listen to whether the heating element has abnormal sounds. If there is an abnormal sound, it may be caused by the heating element loosening, breaking or friction with other components.

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