Microwave oven sintering method of producing silicon nitride ceramics heater and special equipment thereof

A technology of silicon nitride ceramics and special equipment is applied in the field of microwave oven sintering preparation to achieve the effects of reducing energy consumption, good product quality and low sintering temperature

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

Due to the strong reflection and ignition of metal or metal wire to microwaves, microwave sintering of metal heating wire or screen printing electrothermal film slurry has not been reported so far.

Method used

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  • Microwave oven sintering method of producing silicon nitride ceramics heater and special equipment thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Microwave sintering of a silicon nitride ceramic heating element green body with dry-pressed buried wire.

[0020] The special sintering equipment used in this embodiment is shown in FIG. 1 . The special equipment includes a microwave oven body 8 and a corundum crucible 5, in which a special insulation body for sintering is arranged, and the special insulation body for sintering includes: the outermost fiber insulation body 1, the second outer layer Layer insulation body 2, auxiliary heating plate 4 and fiber insulation ball filling layer 3; described corundum crucible is aluminum oxide Al 2 o 3 Made of materials, the auxiliary heating plate is made of silicon carbide SiC material, and the fiber insulation ball is made of alumina Al 2 o 3 Made of materials, the insulation body of the second outer layer is magnesium aluminum spinel-lanthanum chromate MgAl 2 o 4 -LaCrO 3 Material production; between the auxiliary heating plate 4 and the thermal insulation...

Embodiment 2

[0023] Example 2: Microwave sintering of silicon nitride ceramic heating element green body with dry-pressed buried wire.

[0024] First, the ceramic green body of the silicon nitride ceramic heating element made of dry-pressed buried wire made by raw material preparation, blank preparation and debinding process is put into alumina Al 2 o 3 In the corundum crucible 5, then the alumina Al 2 o 3 Corundum crucible with auxiliary heating plate made of silicon carbide SiC, alumina Al 2 o 3 Fiber insulation ball, magnesium aluminum spinel - lanthanum chromate MgAl 2 o 4 -LaCrO 3 Secondary insulation, aluminum oxide Al 2 o 3 The sintering special insulation body composed of fiber insulation body is put into the 2.45GHz multi-mode reaction chamber microwave sintering device as a whole. The microwave oven is first vacuumed to 10Pa, and then filled with 99.9% N 2 , repeat the above-mentioned vacuum pumping and N filling four times 2 program, to the microwave oven cavity N 2 T...

Embodiment 3

[0026] Example 3: Microwave sintering of silicon nitride ceramic heating element green body with film rolling and silk printing.

[0027] First, put the silicon nitride ceramic heating element green body of rolling film and silk screen printing made by raw material preparation, blank preparation and degumming process into alumina Al 2 o 3 A corundum crucible, then alumina Al 2 o 3 Corundum crucible with auxiliary heating plate made of silicon carbide SiC, alumina Al 2 o 3 Fiber insulation ball, magnesium aluminum spinel - lanthanum chromate MgAl 2 o 4 ~LaCrO 3次 Insulation body, aluminum oxide Al 2 o 3 The sintering special insulation body composed of fiber insulation body is put into the 2.45GHz multi-mode reaction chamber microwave sintering device as a whole. First, the microwave oven is evacuated to 10Pa, and then filled with N 2 , repeat the above-mentioned vacuuming and filling with N three times 2 program, to the microwave oven cavity N 2The content is higher ...

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Abstract

A microwave oven sintering preparation method of silicon nitride ceramic heating body and the special equipment belong to the field of preparation process of electric heating body and the special equipment. The present invention is characterized in that the special equipment comprises a microwave oven body, a crucible, a fiber insulation body on the outside layer and an insulation body on a secondary outer layer, a special insulation body for sintering consisting of an assistant heating plate and a fiber insulation ball filling layer. The preparation method is as follows: a ceramic green compact is put into a crucible; then the corundum crucible filled with the ceramic green compact and the special insulation bodies for sintering are together put into a microwave sintering device for sintering. The sintering process is as follows: the inside of the microwave oven is first vacuumed; the N2 of quality percent of more than 90 percent is filled; the procedures are repeated a plurality of times; the temperature-raising program is arranged to be adjustable between 5 DEG C per minute to 50 DEG C per minute; the temperature is raised to be 1300 plus or minus 50 DEG C and kept for 10 to 60 minutes; then the temperature is raised to be between 1600 and 1750 DEG C and kept for 5 to 60 minutes; the microwave source is closed and the product is naturally cooled.

Description

Technical field: [0001] The invention relates to a microwave oven sintering preparation method and special equipment for a silicon nitride ceramic heating element, belonging to the field of electric heating element preparation technology and special equipment. Background technique: [0002] At present, the preparation method of silicon nitride ceramic heating elements is mainly based on the traditional high temperature, high pressure, and long-time sintering process, which consumes a lot of energy and has low production efficiency. With the development and extension of microwave heating technology, microwave heating technology has gradually been applied to the industrial field. For example, microwave ovens are used to sinter the components of various electric heating elements. As far as the ceramic heating element is concerned, due to the uniqueness of microwave heating, a phenomenon called "microwave effect" occurs, which can enhance atomic diffusion and reduce activation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/64C04B35/76
Inventor 郜长福张大牛宋文杰陈闻杰
Owner SHENZHEN JINKE SPECIAL MATERIALS CO LTD
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