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Metal heating element with coating and preparation method thereof

A heating element and coating technology, which is applied in the direction of heating element materials, heating inorganic powder coating, etc., can solve the problems of scaling and easy cracks, and achieve the effect of compact structure, not easy to accumulate water, and uniform heating

Active Publication Date: 2019-05-28
HAIER GRP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The above-mentioned patents and prior art either make the metal heating element have acid resistance, or make the metal heating element have good thermal efficiency, or make the metal heating element have better corrosion resistance, but it still exists or scale, or in the long-term Problems such as cracks are easy to occur under the action of thermal expansion and contraction over time. In order to obtain a metal heating element with better comprehensive performance, the present invention is proposed.

Method used

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  • Metal heating element with coating and preparation method thereof
  • Metal heating element with coating and preparation method thereof
  • Metal heating element with coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The components of the first coating are mixed according to the following mass percentages: the content of silicon oxide is 28%, the content of aluminum oxide is 13%, the content of boron oxide is 44%, the content of calcium oxide is 2%, the content of oxide The content of cobalt is 2%, the content of titanium oxide is 5%, the content of zirconium oxide is 1%, and the content of sodium oxide is 5%; then heated to molten state, cooled, and pulverized.

[0046] By wet spraying, the surface of the stainless steel heating element is covered with a thin, uniform and continuous coating, heated to 900 ° C, kept for 20 minutes; cooled to room temperature, that is. The thickness of this first coating is 100 μm.

Embodiment 2

[0048] The components of the first coating are mixed according to the following mass percentages: the content of silicon oxide is 48%, the content of aluminum oxide is 3%, the content of boron oxide is 30%, the content of calcium oxide is 2%, the content of oxide The content of cobalt is 3%, the content of titanium oxide is 8%, the content of zirconium oxide is 5%, the content of calcium oxide as basic oxide is 1%; then heat to molten state, cool and grind.

[0049] Enamel the first coating on the surface of the stainless steel heating element by electrostatic spraying, heat to 800°C and keep it warm for 10 minutes; cool to room temperature to obtain the product. The thickness of this first coating is 10 μm.

Embodiment 3

[0051] The components of the first coating are mixed according to the following mass percentages: the content of silicon oxide is 32%, the content of aluminum oxide is 10%, the content of boron oxide is 40%, the content of calcium oxide is 5%, the content of oxide The content of cobalt is 6%, the content of titanium oxide is 2%, the content of zirconium oxide is 2%, and the content of potassium oxide is 3%; then heated to molten state, cooled, and pulverized.

[0052] Apply the first coating on the surface of the stainless steel heating element by electrostatic spraying, heat to 840°C, keep it warm for 15 minutes, and cool to room temperature to obtain the finished product. The thickness of this first coating is 350 μm.

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Abstract

The invention particularly relates to a metal heating element with a coating and a manufacturing method of a metal heating element. The metal heating element with the coating is formed by coating a first coating on an original metal heating element. The first coating comprises silicon oxide, aluminum oxide, boron oxide, calcium oxide, cobaltous oxide, titanium oxide, zirconium oxide and basic oxide. The manufacturing method adopts a twice-coating and twice-casting method and includes coating a second coating on the first coating. The metal heating element with the coating is smooth in surface, high in rigidity and free of impurities on the surface and scales, shrinkage rate of the coating and metal of the metal heating element is almost the same, cracks due to shrinkage and expansion during heating can be prevented, and service life of the metal heating element is greatly prolonged. Besides, the metal heating element has the advantages of quite high antibiosis, bacteriostasis, sterilization, virus prevention and the like.

Description

technical field [0001] The present invention relates to a heating element, in particular to a coated metal heating element and its preparation method. Background technique [0002] The metal tubular heating element is a sealed electric heating element that is widely used among all electric heating elements, has simple structure, reliable performance and long service life. As early as the 1930s, the British Hot Point Company applied metal tubular heating elements to household appliances. At present, electric heating tubes have been widely used in industries such as injection molding industry, chemical industry, auxiliary heating and household electric ovens, vertical air conditioners and other electrical appliances at home and abroad. [0003] There are many kinds of metal tubular heating elements, with various structures, but the common feature is that metal tubular materials are used as the shell of the heating element. Because it is in direct contact with the heating medi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B3/12C23C24/08
Inventor 王军于垂妍马峰赵小勇童红利
Owner HAIER GRP CORP
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