Silicon nitride composite ceramics heater

A technology of composite ceramics and silicon nitride, which is applied in the field of silicon nitride composite ceramic heating elements, can solve the problems that the point temperature difference range is not too wide, the thermal shock performance needs to be further improved, and the thermal conductivity of the heating element is not too high, so as to achieve the thermal conductivity Improvement, safe and reliable use, good thermal shock resistance

Inactive Publication Date: 2008-12-10
冷水江市明玉陶瓷工具有限责任公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The thermal conductivity of this heating element is not too high, and the thermal efficiency needs to be further improved;

Method used

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Examples

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Comparison scheme
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Example Embodiment

[0006] Example 1-4:

[0007] (1) Preparation of raw materials: Weigh the ingredients according to the amount ratio in Table 1, and pass the vibrating ball mill for 8 hours, unload, sieving, baking at a constant temperature, and make wax cakes with wax, and keep them sealed.

[0008] (2) Preparation of blanks: processing metal molds according to the shape requirements of the heating element, and preparing blanks by hot die casting.

[0009] (2) Sintering: The prepared blank is loaded into the mold, furnace is loaded, dewaxed, hot pressed under the protection of flowing nitrogen, and the temperature is increased at a uniform rate. The sintering temperature is 1720±3°C; the pressure also slowly increases, and the pressure is controlled at 200- 250kg / cm 2 . After reaching the sintering temperature, the temperature is kept constant and the pressure is constant for 1 hour, and then the temperature is lowered and the pressure is maintained to 1550 ℃ when the power is cut off and the furn...

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PUM

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Abstract

The invention discloses a silicon nitride composite ceramic heating element which is prepared by heat pressing and sintering a heating source and a silicon nitride composite ceramic heating matrix, wherein, the heating source is a tungsten alloy wire or a tungsten alloy printing conductive film, and the silicon nitride composite ceramic heating matrix comprises the following compositions by weight percentage: 71 to 87.05 percent of Si3N4, 0.75 to 6 percent of MgAl2O4, 3 to 10 percent of Y2O3, 0.1 to 2 percent of Ta2O5, 0.1 to 4 percent of La2o3, 1.5 to 6 percent of AlN, 5 to 12 percent of BN, and 0.1 to 5 percent of BaO. The product has better thermal conductivity, the coefficient of the thermal conductivity improved by 11 to 17 percent, better high temperature resistance and thermal shock resistance, good corrosion resistance, high intensity, long service life and safe and reliable use.

Description

technical field [0001] The invention relates to a silicon nitride composite ceramic heating element. Background technique [0002] 99113534.2 discloses a silicon nitride heating element and its manufacturing method. Silicon nitride is used as the heating body, tungsten wire is used as the heating source, and it is formed by hot pressing and sintering. The formula of the heating body is as follows (weight percentage): Nitriding Silicon 82% to 93%, aluminum oxide 0.1% to 5%, diyttrium oxide 4% to 8%, aluminum nitride 3% to 5%. The thermal conductivity of this heating element is not too high, and the thermal efficiency needs to be further improved; the point temperature difference range is not too wide, and the thermal shock performance needs to be further improved. Contents of the invention [0003] The purpose of the present invention is to provide a silicon nitride composite ceramic heating element with better thermal conductivity. [0004] The technical solution of the ...

Claims

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Application Information

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IPC IPC(8): C04B35/584
Inventor 胡铁武
Owner 冷水江市明玉陶瓷工具有限责任公司
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