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Method for preparing tungsten-containing alumina ceramic heating substrate

A ceramic heating and tungsten alumina technology, which is applied in the preparation of tungsten-containing alumina ceramic heating substrates and the preparation of ceramic heating elements, can solve the problem of poor bonding force between ceramics and metal layers, poor wettability of powders, and difficulty in defoaming of slurry. and other problems, to achieve the effect of improving the sintering qualification rate, good air tightness and low equipment cost

Inactive Publication Date: 2012-04-25
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The main purpose of the present invention is to provide solutions that solve the problem of poor wettability of powder by solvent (water), difficulty in defoaming slurry, slow volatilization and long drying time, and the combination of ceramics and metal layers after sintering. A method for preparing a tungsten-containing alumina ceramic heating substrate that can significantly improve the sintering pass rate and production efficiency.

Method used

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  • Method for preparing tungsten-containing alumina ceramic heating substrate
  • Method for preparing tungsten-containing alumina ceramic heating substrate

Examples

Experimental program
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Effect test

Embodiment 1

[0043] ① Preparation of ceramic premix

[0044] Mix distilled water, magnesium oxide, titanium oxide, dispersant and plasticizer, stir with an ultrasonic mixer for 15 minutes, then add 96% alumina powder and adjust the pH value of the system to 11 with ammonia water to prepare a ceramic premix. The amounts of distilled water, magnesium oxide, titanium oxide, dispersant and plasticizer are respectively 101%, 1.8%, 0.7%, 1.6% and 10.7% of the mass of the alumina powder.

[0045] ② Preparation of tungsten slurry

[0046] The composition of the tungsten slurry is as follows: 70% tungsten powder, 20% binder phase, and 10% organic vehicle; the tungsten powder, binder phase, and organic vehicle are mixed and then put into a vibrating ball mill for mixing to make the tungsten slurry evenly The particle size is less than 0.8μm. Wherein the composition of the binder phase is: 5% of manganese oxide, 20% of magnesium oxide, and 75% of silicon dioxide; the composition of the organic carr...

Embodiment 2

[0054] The preparation method is the same as in Example 1, the difference is that the addition of distilled water, magnesium oxide, titanium oxide, dispersant and plasticizer to the ceramic premix described in ① of step 1) is respectively 103% of the quality of the alumina powder. %, 1.4%, 0.9%, 1.8%, 10.6%. The pH value is 10. The addition of the antifoaming agent in step 2) is 0.7% of the quality of the alumina powder, the addition of the binder is 11% of the quality of the alumina powder, and the composition of the binder is by mass percentage: Polyvinyl alcohol 55%, polyethylene glycol 45%.

[0055] The obtained tungsten-containing alumina ceramic heating substrate was tested, and the test results are shown in Table 1.

Embodiment 3

[0057] The preparation method is the same as in Example 1, the difference is that the amounts of distilled water, magnesium oxide, titanium oxide, dispersant and plasticizer in the ceramic premix formula are respectively 99%, 1.5%, and 1.0% of the mass of the alumina powder , 2.0%, 10%, the pH value is 10.5. The addition of defoamer is 1.0% of the mass of the alumina powder, the addition of the binder is 10% of the mass of the alumina powder, and the composition of the binder is: polyvinyl alcohol 50%, Polyethylene glycol 50%.

[0058] The obtained ceramic heating substrate was tested, and the test results are shown in Table 1.

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Abstract

The invention provides a method for preparing a tungsten-containing alumina ceramic heating substrate, and relates to a method for preparing a ceramic heating element. The invention is capable of solving the problems of poor wettability on powder by a solvent (water), difficult defoaming on slurry, slow volatilization, long drying time, poor bonding force of ceramic and metal level after sintering during an aqueous tape-casting process. The method for preparing the tungsten-containing alumina ceramic heating substrate can substantially enhance the sintering qualification rate and production efficiency. The method comprises the following steps: preparing a premix compound and tungsten slurry, ball milling, tape-casting, screen printing, sintering and nickel plating.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and relates to a preparation method of a ceramic heating element, in particular to a preparation method of a tungsten-containing alumina ceramic heating substrate. Background technique [0002] Ceramic heating substrate is a new generation of upgraded heating element products developed in recent years. Because of its environmental protection, high reliability, long life and other characteristics, it is replacing the PTC heating elements commonly used in the past containing lead components. It is widely used at home and abroad. Market prospects. Therefore, research on the production technology of high-temperature alumina ceramic heating substrate products has been paid more and more attention by people. [0003] At present, the more common production process is to pass ceramic raw materials through steps such as ball milling, pressing, sintering, metallization, secondary sintering,...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B41/88C04B35/622
Inventor 罗学涛林彦旭李锦堂傅翠梨
Owner XIAMEN UNIV
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