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Cofired ceramic heating member preparation technology

The invention relates to a technology for a ceramic heating body and a preparation process, which is applied in the field of preparation technology of the heating body, and can solve the problems of reducing the service life of the heating element, uneven heat transfer of the heater, and high cost, so as to accelerate the diffusion of oxygen ions, reduce the production cost, and reduce the production cost. Efficiency-enhancing effect

Active Publication Date: 2015-08-26
广东国研新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional silicon nitride ceramic heating sheet is formed by burying tungsten wire in silicon nitride powder to form a sheet-shaped body and hot-pressing and sintering. Due to the limitation of the process, the heater produced by this process is difficult to position and shape the tungsten wire. The position is shifted during the process, which causes the overall heat transfer of the heater to be uneven. At the same time, due to the obvious interface between the tungsten wire and the silicon nitride powder, it is difficult to become one after sintering. The contact surface of the tungsten wire and the ceramic forms a gap. During the heating process Partial oxidation is formed, reducing the service life of the heating element
At present, the sintering of silicon nitride ceramic heating elements also adopts reaction sintering and hot pressing sintering. However, reaction sintering has poor density and poor mechanical properties. Although hot pressing sintering has high density and good mechanical properties, it is expensive and difficult to produce on a large scale.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] The preparation process of a laminated co-fired ceramic heating body in this embodiment comprises the following process steps:

[0100] a. Mixing: Weigh 65% Si by mass percentage 3 N 4, 10% MgO, 5% Y 2 o 3 , 5% Al 2 o 3 , 5% SiO 2 , 5% La 2 o 3 , 5% BN and mix and stir evenly to make ceramic substrate powder;

[0101] b. Ball milling: add the ceramic substrate powder prepared in step a into grinding balls, solvent and adhesive and put it into a ball mill tank for wet ball milling. The time of wet ball milling is 8 hours;

[0102] c, defoaming: the mixture after wet ball milling in step b is degassed under vacuum conditions;

[0103] d. Forming and drying: cast the mixture in step c into a ceramic substrate with a casting machine or roll it into a ceramic substrate with a film rolling equipment, and dry the ceramic substrate;

[0104] e, printing: the resistance paste is printed on the surface of the ceramic substrate after being dried in step d by the screen p...

Embodiment 2

[0109] The preparation process of a laminated co-fired ceramic heating body in this embodiment comprises the following process steps:

[0110] a. Mixing: Weigh 98% Si by mass percentage 3 N 4 , 0.5% MgO, 0.5% Y 2 o 3 , 0.2% Al 2 o 3 , 0.3% SiO 2 , 0.2% La 2 o 3 , 0.3% BN and mix and stir evenly to make ceramic substrate powder;

[0111] b. Ball milling: add the ceramic substrate powder prepared in step a into grinding balls, solvent and adhesive and put it into a ball mill jar for wet ball milling. The time for wet ball milling is 11 hours;

[0112] c, defoaming: the mixture after wet ball milling in step b is degassed under vacuum conditions;

[0113] d. Forming and drying: cast the mixture in step c into a ceramic substrate with a casting machine or roll it into a ceramic substrate with a film rolling equipment, and dry the ceramic substrate;

[0114] e, printing: the resistance paste is printed on the surface of the ceramic substrate after being dried in step d by...

Embodiment 3

[0119] The preparation process of a laminated co-fired ceramic heating body in this embodiment comprises the following process steps:

[0120] a. Mixing: Weigh 75% Si by mass percentage 3 N 4 , 8% MgO, 4% Y 2 o 3 , 4% Al 2 o 3 , 3% SiO 2 , 3% La 2 o 3 , 3% BN and mix and stir evenly to make ceramic substrate powder;

[0121] b. Ball milling: add the ceramic substrate powder prepared in step a into grinding balls, solvent and adhesive and put it into a ball mill tank for wet ball milling. The time of wet ball milling is 14 hours;

[0122] c, defoaming: the mixture after wet ball milling in step b is degassed under vacuum conditions;

[0123] d. Forming and drying: cast the mixture in step c into a ceramic substrate with a casting machine or roll it into a ceramic substrate with a film rolling equipment, and dry the ceramic substrate;

[0124] e, printing: the resistance paste is printed on the surface of the ceramic substrate after being dried in step d by the screen ...

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PUM

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Abstract

The invention relates to the technical field of heating member preparation and especially relates to a cofired ceramic heating member preparation technology. The cofired ceramic heating member preparation technology orderly comprises material blending, ball milling, drainage, molding and drying, printing, lamination, sintering and electrode connection. The cofired ceramic heating member preparation technology has simple processes. A blank is sintered under normal pressure in a tunnel kiln-combined reduction sintering atmosphere so that continuous production is realized, production efficiency is high, a liquid sintering method is used, a sintering temperature is low, a production cost is low and large scale production is realized.

Description

technical field [0001] The invention relates to the technical field of preparation technology of a heating body, in particular to a preparation technology of a laminated co-fired ceramic heating body. Background technique [0002] Silicon nitride heating element is a device that combines high-performance silicon nitride ceramic substrate and long-life high-power high-temperature metal heating wire. It has the characteristics of small size, high power and high thermal efficiency. Proven to be a safe and reliable way to generate heat. [0003] As a covalent bond compound, silicon nitride has a small diffusion coefficient and no melting point. It decomposes into ammonia and silicon at about 2173K, making it difficult to sinter. At present, the traditional silicon nitride ceramic heating sheet is formed by burying tungsten wire in silicon nitride powder to form a sheet-shaped body and hot-pressing and sintering. Due to the limitation of the process, the heater produced by this ...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/622
Inventor 陈闻杰何峰斌张明军
Owner 广东国研新材料有限公司
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