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Manufacturing method of silicon nitride heating plate

A technology for a silicon nitride heating sheet and a manufacturing method, applied in the field of electrothermal materials, can solve the problems of not too high thermal conductivity, not too wide temperature difference range, etc., and achieve the effects of high thermal shock performance, high qualification rate and high thermal efficiency

Inactive Publication Date: 2012-01-25
邓湘凌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal conductivity of this silicon nitride heating element is not too high, the thermal efficiency needs to be further improved, the temperature range is not too wide, and the thermal shock performance needs to be further improved

Method used

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  • Manufacturing method of silicon nitride heating plate
  • Manufacturing method of silicon nitride heating plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of casting slurry: 88 parts of silicon nitride, 8.5 parts of aluminum oxide, 1.5 parts of diyttrium trioxide, 1.1 parts of paraffin wax, 1.7 parts of microcrystalline wax, 0.1 part of stearin wax, and 6.5 parts of plastic are provided in parts by weight The raw material for making the silicon nitride heating sheet is prepared into casting slurry; wherein, the plastic can be selected from one of PE, PP, HIPS, PET or a combination thereof.

[0036] The casting slurry was casted by a casting machine by a tape casting method, and dried at 60° C. for 2 hours at the same time to obtain a blank of a silicon nitride heating sheet.

[0037] Provide tungsten paste, use tungsten paste to print a tungsten wire as a heat source at the corresponding position of a blank, and then align and buckle another blank on top to form a blank combination.

[0038] Vacuum packaging: use plastic film to vacuum package the combination of the above blanks.

[0039] Hot isostatic pressi...

Embodiment 2

[0043] Preparation of casting slurry: 90 parts of silicon nitride, 7.5 parts of aluminum oxide, 3.5 parts of diyttrium trioxide, 1.7 parts of paraffin wax, 1.4 parts of microcrystalline wax, 0.3 part of stearin wax, and 7.5 parts of plastic are provided in parts by weight The raw materials for making the heating body are formulated into slurry; the plastic can be selected from one of PE, PP, HIPS, PET or a combination thereof.

[0044] The casting slurry was casted by a casting machine by a tape casting method, and dried at 90° C. for 1.5 hours at the same time to obtain a blank of a silicon nitride heating sheet.

[0045] Provide tungsten paste, use tungsten paste to print a tungsten wire as a heat source at the corresponding position of a blank, and then align and buckle another blank on top to form a blank combination.

[0046] Vacuum packaging: use plastic film to vacuum package the combination of the above blanks.

[0047] Hot isostatic pressing: put the green embryos pa...

Embodiment 3

[0051] Preparation of casting slurry: 92 parts of silicon nitride, 6.5 parts of aluminum oxide, 2.5 parts of diyttrium trioxide, 1.4 parts of paraffin wax, 1.7 parts of microcrystalline wax, 0.2 parts of stearin wax, and 7 parts of plastic are provided in parts by weight The raw materials for making the heating body are formulated into slurry; the plastic can be selected from one of PE, PP, HIPS, PET or a combination thereof.

[0052] The casting slurry was casted by a casting machine by a tape casting method, and dried at 120° C. for 1 hour at the same time to obtain a blank of a silicon nitride heating sheet.

[0053] Provide tungsten paste, use tungsten paste to print tungsten wire as a heat source at the corresponding position of one blank, and then align and buckle another blank on top to form a blank combination.

[0054] Vacuum packaging: use plastic film to vacuum package the combination of the above blanks.

[0055] Hot isostatic pressing: Put the raw embryos packaged ...

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Abstract

The invention provides a manufacturing method of a silicon nitride heating plate, which comprises the following steps: 1, preparing cast slurry; 2, casting the cast slurry in a casting formation method and obtaining plain blanks after drying; 3, providing molten tungsten, using the molten tungsten to print a tungsten wire as a heating source at a corresponding position on one plain blank, and neatly buckling the other plain blank on the plain blank to form a plain blank combination; 4, packaging under vacuum conditions; 5, hot isostatic pressing: placing the plain blank combination packaged by a plastic film into liquid of 75-85 DEG C in an isostatic machine, and applying 130-160atmos to slightly melting and bonding the plain blanks; 6, pre-sintering; 7, sintering in an air pressure furnace; and 8, cooling to obtain the silicon nitride heating plate. The manufacturing process is simple, and the operation can be easily controlled. The pass rate of the silicon nitride heating plate manufactured in the method is higher, the silicon nitride heating plate has higher thermal conductivity and higher thermal efficiency, and silicon nitride also has higher thermal shock resistance.

Description

technical field [0001] The invention relates to electrothermal materials, in particular to a method for manufacturing a silicon nitride heating sheet. Background technique [0002] At present, instant electric water heaters and instant faucets using silicon nitride as a heating element have been supplied in the domestic market. Instant electric water heaters combined with gas water heaters and storage-type electric water heaters have the advantages of rapid heating, sustainable hot water supply, small size, safety and environmental protection. The silicon nitride heating element has a fast heating speed and can be used continuously without waiting. The hot water usage rate is almost 100%, which saves electricity and energy, and the heating pipe is not easy to scale and has a longer service life. The existing silicon nitride heating element is usually a one-time sintered heating piece, which adopts the electric heating wire buried in the silicon nitride powder, and then sint...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/622
Inventor 邓湘凌马斌
Owner 邓湘凌
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