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Silicon nitride heating element and making method thereof

A technology of silicon nitride heating element and silicon nitride powder, applied in the direction of heating element materials, etc., can solve the problems of affecting the service life of products, high manufacturing costs, and large safety hazards, and achieve the goal of reducing finished products and improving environmental safety hazards. Effect

Active Publication Date: 2012-01-11
浙江美工精细陶瓷科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The matrix material has low fracture toughness at high temperature
The manufactured product is prone to matrix fracture during use, which affects the service life of the product
During the manufacturing process of the heating element, anhydrous ethanol is used as the blending agent when mixing materials, which leads to high manufacturing costs and great potential safety hazards

Method used

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  • Silicon nitride heating element and making method thereof
  • Silicon nitride heating element and making method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Take 90 grams of silicon nitride powder, 3 grams of yttrium oxide powder, 4 grams of lanthanum oxide powder and 3 grams of aluminum oxide powder into a nylon bucket, add distilled water, silicon nitride balls, ball mill for 4-20 hours, and then pour into the container , put it in an oven to dry, and sieve the powder for later use. Take one-half of the weight of the powder and pour it into the green mold, then scrape it flat, put the tungsten wire into the mold, add the other half of the powder and scrape it, put the upper head into the green mold, and use A 60-ton press presses the powder in the mold into a silicon nitride green body with a density of 45-50%.

[0020] Then the above-mentioned silicon nitride biscuits are clamped by two graphite backing plates from top to bottom to form a laminate, and the multiple laminates are stacked together, and the laminates are covered with graphite baffles around them, and placed in the mold Compress it, place it in a vacuum hot...

Embodiment 2

[0023] The manufacturing steps are the same as in Example 1, except that the silicon nitride powder is 85 grams, the yttrium oxide powder is 5 grams, the lanthanum oxide powder is 9 grams, and the aluminum oxide powder is 1 gram.

Embodiment 3

[0025] The manufacturing steps are the same as in Example 1, except that the silicon nitride powder is 87 grams, the yttrium oxide powder is 1 gram, the lanthanum oxide powder is 2 grams, and the aluminum oxide powder is 10 grams.

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Abstract

The invention provides a silicon nitride heating element and a making method thereof. The silicon nitride heating element comprises a carrier, a heating tungsten filament with an electrode and a conducting wire, wherein the carrier is prepared from 85-93wt% of silicon nitride powder, 0.4-6wt% of yttrium oxide powder, 1.5-10wt% of lanthanum oxide powder and 0.1-12wt% of aluminum oxide powder, the heating tungsten filament is embedded in the carrier, the electrode of the heating tungsten filament is arranged at one end of the carrier, and the conducting wire is in welding connection with the electrode of the heating tungsten filament. The making method of the silicon nitride heating element comprises the steps of making a silicon nitride biscuit, making a silicon nitride heating element matrix, welding the conducting wire and the like. The carrier of the silicon nitride heating element is made by mixing the silicon nitride powder, the aluminum oxide powder, the yttrium oxide powder and the lanthanum oxide powder so that the high-temperature (higher than 1300 DEG C) fracture toughness of the carrier is higher than that of a carrier made by mixing the silicon nitride powder, the yttrium oxide powder and the aluminum oxide powder, and absolute ethyl alcohol is replaced by distilled water as a mixed powder blender in the making process so that the making cost can be reduced, and theenvironmental potential safety hazard can be improved.

Description

technical field [0001] The invention relates to an electric heating element, in particular to a silicon nitride heating element and a manufacturing method thereof. Background technique [0002] Aluminum oxide, yttrium oxide and silicon nitride are currently used as the base material of the silicon nitride heating element. The matrix material has low fracture toughness at high temperature. The manufactured product is prone to matrix fracture during use, which affects the service life of the product. In the manufacturing process of the heating element, absolute ethanol is used as a blending agent during mixing, which has high manufacturing costs and great potential safety hazards. Contents of the invention [0003] The object of the present invention is to provide a new silicon nitride heating element and its manufacturing method in order to solve the above problems. [0004] In order to achieve the above object, the present invention adopts the following technical soluti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B3/10B22F3/12C04B35/584C04B35/622
Inventor 陈长明
Owner 浙江美工精细陶瓷科技有限公司
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