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Silicon nitride heating element and preparation method thereof

A silicon nitride heating element and silicon nitride technology, applied in the field of electric heating elements, can solve the problems of affecting the service life of base materials, reducing safety and reliability, and deteriorating the insulation performance of materials, so as to improve reliability and safety, The effect of promoting crack deflection and eliminating material stress

Inactive Publication Date: 2016-09-14
HENGYANG KAIXIN SPECIAL MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The infiltration of carbon elements will deteriorate the insulation performance of the material, reducing safety and reliability
At the same time, due to the short hot-press sintering time and relying on mechanical pressure to strengthen the densification effect, the obtained material has a microstructure with large grain boundary stress and insufficient liquid phase crystallization, which affects the service life of the base material

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] S1, choose 80 parts by weight of silicon nitride powder, 0.1 parts by weight of aluminum oxide powder, 2 parts by weight of diyttrium trioxide powder, 3 parts by weight of aluminum nitride powder, 1 Parts by weight of boron carbide powder are mixed, and the mixture and high-temperature liquid-phase sintering aid are mixed in absolute ethanol at a weight ratio of 0.80:0.02. After the mixture is ground for 24 hours, it is sprayed and granulated. make recipes;

[0038] S1. After the formula is dry-pressed and formed, it is further pressed and formed by 200MPa cold isostatic pressing, and the pressure is kept for 5 minutes to make a blank;

[0039] S3, drying after evenly coating a layer of boron nitride isolation layer on the surface of the blank;

[0040] S4. Install the blank in a hot-pressed graphite mold and then carry out hot-press sintering. The contact surface between the hot-pressed graphite mold and the blank is coated with a layer of the boron nitride isolation ...

Embodiment 2

[0044] S1, choose the silicon nitride powder material of 95 parts by weight, the aluminum oxide powder material of 5 parts by weight, the diyttrium trioxide powder material of 8 parts by weight, the aluminum nitride powder material of 5 parts by weight, 3 Parts by weight of boron carbide powder are mixed, and the mixture and high-temperature liquid-phase sintering aid are mixed in absolute ethanol at a weight ratio of 0.90:0.04. After the mixture is ground for 72 hours, it is sprayed and granulated. Formulated ingredients;

[0045] S1. After the formula is dry-pressed and formed, it is further pressed and formed by cold isostatic pressing of 250 MPa, and the pressure is kept for 10 minutes to make a blank;

[0046] S3, drying after evenly coating a layer of boron nitride isolation layer on the surface of the blank;

[0047] S4. Install the blank in a hot-pressed graphite mold and then carry out hot-press sintering. The contact surface between the hot-pressed graphite mold and...

Embodiment 3

[0051] S1, choose 90 parts by weight of silicon nitride powder, 3 parts by weight of aluminum oxide powder, 5 parts by weight of diyttrium trioxide powder, 4 parts by weight of aluminum nitride powder, 2 Parts by weight of boron carbide powder are mixed, and the mixture and high-temperature liquid-phase sintering aid are mixed in absolute ethanol at a weight ratio of 0.90:0.04. After the mixture is ground for 72 hours, it is sprayed and granulated. Formulated ingredients;

[0052] S1. After the formula is dry-pressed and formed, it is further pressed and formed by cold isostatic pressing of 220 MPa, and the pressure is kept for 8 minutes to make a blank;

[0053] S3, drying after evenly coating a layer of boron nitride isolation layer on the surface of the blank;

[0054] S4. Put the blank in a hot-pressed graphite mold and then carry out hot-press sintering. The contact surface between the hot-pressed graphite mold and the blank is coated with a layer of the boron nitride is...

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Abstract

The invention discloses a silicon nitride heating element and a preparation method thereof. The silicon nitride heating element is composed of a heating source and a heating body; the heating source is tungsten wire, and the heating body is prepared from raw materials of, by weight, 80-95 parts of silicon nitride (Si3N4), 0.1-5 parts of aluminum oxide (Al2O3), 2-8 parts of yttrium oxide (Y2O3) and 3-5 parts of aluminum nitride (A1N) by grinding, mold pressing and high temperature sintering. The silicon nitride heating element produced by the method has the advantages of high reliability and safety, increased fracture toughness and increased bending strength.

Description

technical field [0001] The invention relates to the technical field of electric heating elements, in particular to a silicon nitride heating element and a preparation method thereof. Background technique [0002] Silicon nitride is a covalently bonded ceramic, pure Si 3 N 4 The powder cannot be sintered, and a small amount of sintering aid must be added to form a liquid phase at high temperature for liquid phase sintering in order to obtain silicon nitride materials with excellent properties. Commonly used additives include: A1 2 0 3 , MgO, Si0 2 and other metal oxides, Y 2 0 3 , La 2 0 3 , Ce0 2 and other rare earth oxides, and AlN, Mg 3 N 2 , TiN, ZrN and other nitrides. High-performance silicon nitride ceramics have excellent electrical, thermal and mechanical properties such as insulation, high strength, high temperature resistance, oxidation resistance, thermal shock resistance and high thermal conductivity. [0003] Silicon nitride heating element is a dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/64C04B35/626C04B41/87
CPCC04B35/584C04B35/6261C04B35/6264C04B35/64C04B41/5066C04B41/87C04B2235/3217C04B2235/3225C04B2235/3821C04B2235/3865C04B2235/656C04B2235/658C04B2235/661C04B2235/77C04B2235/786C04B2235/788C04B2235/96
Inventor 曾小锋李勇全
Owner HENGYANG KAIXIN SPECIAL MATERIAL TECH CO LTD