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A heat-resistant insulating ceramic coating and its preparation method

A ceramic coating, heat-resistant insulation technology, applied in coatings, insulators, fire-resistant coatings, etc., can solve the problems of difficult to meet large-scale production needs and high production costs, achieve low cost, enhance bonding force, and improve temperature resistance. effect of ability

Inactive Publication Date: 2020-10-20
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After research, it is found that the glass is spun into a capillary glass tube, the metal liquid enters the capillary glass tube, and after cooling and solidifying, a glass-coated metal microwire is formed. The thickness of this coating is only 2-4 μm, and the average breakdown voltage at 400 ° C is 1174V, but this method requires high instrument accuracy, the accuracy needs to reach the micron level, and the metal needs to be melted and spun into metal microfilaments. The preparation cost is high, and it is difficult to meet the needs of large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing a heat-resistant insulating ceramic coating for coating nickel-plated wire equipment at high temperature, comprising the following steps:

[0029] a. Weighing: xylene: 50g, acetylacetone: 15g, butyl titanate: 30g, methyltrimethoxysilane: 5g, heavy lead glass powder: 30g, talcum powder: 20g, montmorillonite powder: 5g.

[0030] Dry-mill heavy glass powder, talc powder and montmorillonite powder on a planetary gear ball mill for 24 hours to obtain inorganic powder;

[0031] b. Stir xylene, butyl titanate and acetylacetone at a speed of 300r / min for 30min to obtain an organic solvent;

[0032] c. Add the inorganic powder into the organic solvent to obtain a mixture, and the solid content of the mixture is greater than 30%, add trimethoxysilane, and stir at 1800r / min for 30min to obtain a slurry.

[0033] d. first carry out surface treatment to the metal nickel wire, the specific process is as follows: the metal nickel wire is 3% Na in the mass fract...

Embodiment 2

[0036] A method for preparing a heat-resistant insulating ceramic coating for coating nickel-plated wire equipment at high temperature, comprising the following steps:

[0037] a. Weigh xylene: 40g, acetylacetone: 20g, butyl titanate: 35g, methyltrimethoxysilane: 5g, heavy lead glass powder: 25g, talcum powder: 15g, montmorillonite powder: 10g.

[0038] Dry-mill heavy glass powder, talc powder and montmorillonite powder on a planetary gear ball mill for 24 hours to obtain inorganic powder;

[0039] b. Stir xylene, butyl titanate and acetylacetone at a speed of 300r / min for 30min to obtain an organic solvent;

[0040] c. adding the inorganic powder into the organic solvent to obtain a mixture, and the solid content of the mixture is greater than 30%, adding methyltrimethoxysilane and stirring at 2000r / min for 30min to obtain a slurry.

[0041]d. first carry out surface treatment to the metal nickel wire, the specific process is as follows: the metal nickel wire is 3% Na in the...

Embodiment 3

[0044] A method for preparing a heat-resistant insulating ceramic coating for coating nickel-plated wire equipment at high temperature, comprising the following steps:

[0045] a. Weighing: xylene: 60g, acetylacetone: 12g, butyl titanate: 25g, methyltrimethoxysilane: 3g, heavy lead glass powder: 35g, talcum powder: 20g, montmorillonite powder: 3g.

[0046] Dry-mill heavy glass powder, talc powder and montmorillonite powder on a planetary gear ball mill for 24 hours to obtain inorganic powder;

[0047] b. Stir xylene, butyl titanate and acetylacetone at a speed of 300r / min for 30min to obtain an organic solvent;

[0048] c. adding the inorganic powder into the organic solvent to obtain a mixture, and the solid content of the mixture is greater than 30%, adding methyltrimethoxysilane and stirring at 1800r / min for 30min to obtain a slurry.

[0049] d. first carry out surface treatment to the metal nickel wire, the specific process is as follows: the metal nickel wire is 3% Na in...

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Abstract

A heat-resistant insulating ceramic coating and a preparation method thereof. According to the mass ratio of 1: (0.08-0.5): (0.5-0.85), xylene, acetylacetone and butyl titanate are evenly stirred to obtain component A; Mass ratio 1: (0.25 ~ 0.8): (0.1 ~ 0.25), after mixing heavy lead glass powder, talc powder and montmorillonite powder, component B is obtained; by mass percentage, 60 ~ 75% of the component A and 25-40% of component B are uniformly mixed to obtain a solution; the surface-treated metal nickel wire is immersed in the solution, and then one end of the metal nickel wire is pulled vertically upward from the slurry, dried and sintered to obtain Heat-resistant insulating ceramic coating. The preparation process of the present invention is simple, and the thickness of the prepared coating is 10-30 μm. The prepared coating still has good insulation at 250 V at 360 ° C, and can be bent with the metal nickel wire, and has good bonding force with the metal nickel .

Description

technical field [0001] The invention relates to a method for preparing a flexible high-temperature-resistant insulating ceramic coating based on a metal wire, in particular to a heat-resistant insulating ceramic coating and a preparation method thereof, belonging to the technical field of coating application Background technique [0002] At present, metal wires are widely used in aerospace, petrochemical, nuclear energy, military, people's livelihood, etc., and general insulating coatings can meet the needs of metal wires in most working conditions. However, the coating of ordinary metal wires loses their insulation at high temperatures (use temperature > 300°C). At the same time, the thermal expansion coefficient of the metal is larger, and the thermal expansion coefficient of the general ceramic coating does not match the thermal expansion coefficient of the metal wire, which causes the coating to start to fall off after multiple cold and heat cycles. Therefore, it is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D1/00C09D5/25C09D7/63C09D7/20
CPCC09D1/00C09D5/18C09D7/20C09D7/63H01B3/308
Inventor 李红伟饶欣远逯攀岩黎盛忠
Owner CHANGAN UNIV
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