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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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Problems solved by technology

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

Method used

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Embodiment 1-4

[0007] (1) Preparation of raw materials: weigh the ingredients according to the ratio in Table 1, vibrate and ball mill for 8 hours, unload, sieve, bake at a constant temperature, and make wax cakes with wax, and seal them for preservation.

[0008] (2) Biscuit preparation: Process the metal mold according to the shape requirements of the heating element, and prepare the biscuit by hot die casting.

[0009] (2) Sintering: The prepared biscuit is loaded into a mold, loaded into a furnace, dewaxed, hot-pressed under the protection of flowing nitrogen, and heated at a constant speed. 250kg / cm 2 . After reaching the firing temperature, keep the temperature and pressure constant for 1 hour, then lower the temperature and keep the pressure down to 1550°C, then cut off the power and shut down the furnace. 2.5 hours to 3 hours after power failure and furnace shutdown, it will be released from the furnace for demoulding, and the initial inspection and inspection will be carried out t...

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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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