Microwave sintering method for thermal resistor with positive temperature coefficient and its special device

A positive temperature coefficient and thermistor technology, which is applied in the direction of resistors with positive temperature coefficients, resistors, resistance manufacturing, etc., can solve the problems of few applications, achieve low sintering temperature, high energy utilization rate, and short constant temperature time Effect

Inactive Publication Date: 2008-04-02
SHENZHEN JINKE SPECIAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, microwaves have been successfully sintered at home and abroad such as aluminum oxide Al 2 o 3 , silicon nitride Si 3 N 4 , silicon carbide SiC and other ceramics, but they are all limited to the preparation of high-strength, high-hardness, high-toughness structural ceramics, and are rarely used in the field of electronic ceramics, especially heat-sensitive ceramics, especially at present, there is no use of microwave sintered titanic acid Barium Series Positive Temperature Coefficient Thermistor Ceramic Technology

Method used

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  • Microwave sintering method for thermal resistor with positive temperature coefficient and its special device

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Experimental program
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Effect test

Embodiment 1

[0017] First, prepare the special equipment used in the present invention. The special equipment for the equipment, as shown in Figure 1, includes a microwave oven body 1, in which a sintering special insulation body is provided, and the sintering special insulation The body includes: an outer fiber insulation body 1, a secondary outer insulation body 2 and an inner crucible 4, and a fiber insulation ball filling layer 3 is provided between the outer insulation body 2 and the inner crucible 4; A thermal insulation space 6 is provided between the fiber thermal insulation body 1 of the outer layer and the thermal insulation body 2 of the secondary outer layer. In this embodiment, the fiber insulation 1 of the outer layer is Al 2 O 3 Material production; the second outer layer insulation body 2 is MgAl 2 O 4 -LaCrO 3 Material production, the inner crucible 4 is Al 2 O 3 Corundum crucible made of materials; the fiber insulation ball is Al 2 O 3 Fiber insulation ball. The outer fiber i...

Embodiment 2

[0020] Put ceramic green body 5 into Al 2 O 3 Corundum crucible, and then filled with the green Al 2 O 3 Corundum crucible, Al 2 O 3 Fiber insulation ball 3, MgAl 2 O 4 -LaCrO 3 Insulation body 2, Al 2 O 3 The fiber insulation body 1 is put into a 2.45GHz multi-mode reaction cavity microwave oven sintering device, and sintered at a power lower than 6.0KW. The microwave power is 1.2KW in the temperature range from room temperature to 400°C, and the heating rate is 15°C / min , The heating rate is 10℃ / min in the temperature zone of 400℃~1150℃, the temperature is kept constant at 1200℃ for 20 minutes, and then the temperature is reduced to 500℃ at 10℃ / min, and then the microwave source is turned off and cooled naturally. Barium titanate series positive temperature coefficient thermistor ceramics. The outer fiber insulation body 1 is a cylindrical structure with upper and lower cover plates; the corundum crucible 4 is a cylindrical structure with upper and lower cover plates.

[0021] T...

Embodiment 3

[0023] Put ceramic green body 5 into Al 2 O 3 Corundum crucible 4, and then fill the Al 2 O 3 Corundum crucible, Al 2 O 3 Fiber insulation ball 3, MgAl 2 O 4 -LaCrO 3 Insulation body 2, Al 2 O 3 The fiber insulation body 1 is put into a 2.45GHz multi-mode reaction cavity microwave sintering device, and sintered at a power lower than 6.0KW. The microwave power is 1.5KW in the temperature range from room temperature to 400°C, and the heating rate is 18°C / min. , In the temperature zone of 400℃~1150℃, the heating rate is 20℃ / min, at 1250℃, constant temperature for 15 minutes, and then the temperature is reduced to 500℃ at 10℃ / min, and then the microwave source is turned off and cooled naturally to obtain a uniform and compact without cracking Barium titanate series positive temperature coefficient thermistor ceramics.

[0024] The other parts of this embodiment are completely the same as the first embodiment.

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Abstract

A microwave sintering method of posiode and special hardware belong to the preparation method field of electronic heating element. The microwave sintering method comprises the following art procedures: a posiode green ware body of the series of barium titanate made by the prior art is placed into a crucible and a sintering special thermal insulator, and then the whole is placed into a micro-wave oven to sinter; the sintering procedure is that the speed of temperature rise is controlled between 5 degrees per minute and 100 degrees per minute, after the temperature is up to 1100 degrees to 1300 degrees, the whole is kept at a constant temperature for 5 to 60 minutes, and then the whole is cooled down to the room temperature at the cooling rate of 3 to 30 degrees per minute; the special hardware is a sintering special thermal insulator arranged in the micro-wave oven body, the sintering special thermal insulator comprises a fibre thermal insulator in the outer layer and a thermal insulator in the sub outer layer; a fibre insulation ball packed layer is arranged between the thermal insulator in the sub outer layer and the crucible in the inner layer. The invention is of short cycle of sintering art, good quality of products and high rate of finished products, thereby improving the production benefit and saving energy sources.

Description

Technical field: [0001] The invention relates to a microwave sintering method and special equipment for a positive temperature coefficient thermistor, belonging to the field of preparation methods of electronic heating elements, in particular to the technical field of preparation of barium titanate series positive temperature coefficient thermistors. Background technique: [0002] In recent years, with the development of microwave high-temperature sintering technology and microwave high-temperature sintering equipment, microwave sintered ceramics have made great progress and have attracted more and more attention because of their fast, sensitive, energy-saving, and efficient conventional sintering methods. It does not have many advantages, it has broad prospects in ceramic sintering preparation. The difference between microwave sintering and conventional sintering is that conventional sintering relies on the heating element to transfer heat to the object to be heated by convectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02H01C17/30C04B35/64
Inventor 郜长福张大牛宋文杰陈闻杰郑阳
Owner SHENZHEN JINKE SPECIAL MATERIALS CO LTD
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