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Ceramic insulator with microgrooves and self-assembled molecular film on surface and preparation method thereof

A ceramic insulator and self-assembly technology, applied in insulators, electrical components, circuits, etc., can solve the problems of insignificant increase in vacuum surface flashover voltage, single surface of ceramic insulators, difficult to put into practical application, etc., to reduce secondary electrons Emissivity coefficient, good adhesion, and the effect of enhancing stability

Active Publication Date: 2020-05-19
NORTHWEST INST OF NUCLEAR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a ceramic insulator with microgrooves and self-assembled molecular film on the surface and its preparation method, so as to solve the problem that the existing methods for modifying the surface of ceramic insulators are relatively single, and the effect of boosting the flashover voltage along the vacuum surface is not good. Obvious, poor stability, technical problems that are difficult to put into practical application

Method used

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  • Ceramic insulator with microgrooves and self-assembled molecular film on surface and preparation method thereof
  • Ceramic insulator with microgrooves and self-assembled molecular film on surface and preparation method thereof
  • Ceramic insulator with microgrooves and self-assembled molecular film on surface and preparation method thereof

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preparation example Construction

[0045] see figure 2 , the present invention also provides a method for preparing a ceramic insulator with microgrooves and self-assembled molecular films on the surface, comprising the following steps:

[0046] Step 1: According to the size requirements of the ceramic insulator with microgrooves and self-assembled molecular film on the surface to be prepared, process the corresponding insulator as it is; for the surface morphology of the insulator as it is, see image 3 (a);

[0047] Step 2: Turn on the laser, and set the laser parameters according to the width, depth and period size of the microgrooves that are required to be processed on the surface of the ceramic insulator with microgrooves and self-assembled molecular films on the surface to be prepared; through laser etching, the processed in step 1 Microgrooves are etched on the surface of the insulator as it is; for the surface morphology of the ceramic insulator after microgrooves are etched, see image 3 (b);

[0...

Embodiment 1

[0056] (1) Process a cylindrical alumina ceramic insulator with a diameter of 30 mm and a thickness of 10 mm as it is;

[0057] (2) Turn on the ultraviolet laser, set the laser parameters, and etch microgrooves with a width of 20 μm, a depth of 20 μm, and a period of 20 μm on the original surface of the insulator processed in step 1 by laser etching;

[0058] (3) Use a dilute hydrochloric acid solution with a concentration of 5% by mass to ultrasonically clean the insulator after the microgrooves have been etched on the surface for 30 mins to remove residual ceramic particles on the surface, clean it with deionized water, and place it in an oven at 80 ° C. Dry 12h;

[0059] (4) Weigh octadecyltrichlorosilane (OTS), toluene and deionized water according to the volume ratio of 1:20:1, then mix and stir the three evenly, prepare the toluene solution of OTS, and carry out at room temperature 0.1 hour hydrolysis to make OTS toluene hydrolysis solution;

[0060] (5) Put the insula...

Embodiment 2

[0064] (1) Process the cylindrical alumina porcelain insulator with a diameter of 30mm and a thickness of 10mm as it is;

[0065] (2) Turn on the fiber laser, set the laser parameters, and etch microgrooves with a width of 100 μm, a depth of 300 μm, and a period of 500 μm on the original surface of the insulator processed in step 1 by laser etching;

[0066] (3) Use a dilute hydrochloric acid solution with a concentration of 5% by mass to ultrasonically clean the insulator after the microgrooves have been etched on the surface for 30 mins to remove residual ceramic particles on the surface, clean it with deionized water, and place it in an oven at 80 ° C. Dry 12h;

[0067] (4) Weigh KH-550, acetone and deionized water according to the volume ratio of 1:500:1, then mix and stir the three evenly, prepare the acetone solution of KH-550, carry out hydrolysis at room temperature for 1 hour, and prepare Become the acetone hydrolysis solution of KH-550;

[0068] (5) Put the insulat...

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Abstract

The invention relates to a ceramic insulator and a preparation method thereof, in particular to a ceramic insulator with microgrooves and a self-assembled molecular film on the surface and a preparation method of the ceramic insulator, and solves the problems that existing methods for modifying the surface of the ceramic insulator is single, the vacuum surface flashover voltage is not obviously improved, the stability is poor, and the ceramic insulator is difficult to put into practical application. The insulator is characterized in that the surface of the ceramic insulator body is provided with a periodic parallel ten-micron micro-groove array ; the central axis of each microgroove in the microgroove array is perpendicular to the direction of the electric field; the array direction of themicrogroove array is parallel to the direction of the electric field; the microgrooves are formed by laser etching; the surfaces of the ceramic insulator body and the microgrooves are covered with self-assembled molecular films; and the self-assembled molecular film is a protective film generated by standing the ceramic insulator body in a silane coupling agent hydrolysis solution. The inventionalso provides a preparation method of the ceramic insulator with the microgrooves and the self-assembled molecular film on the surface.

Description

technical field [0001] The invention relates to a ceramic insulator and a preparation method thereof, in particular to a ceramic insulator with microgrooves and a self-assembled molecular film on the surface and a preparation method thereof. Background technique [0002] When an insulator is vacuum-insulated, the insulation strength of the insulator bulk phase and vacuum is generally high, which can meet the insulation requirements in most cases; but at the interface between the two, due to the existence of surface flashover, the surface breakdown discharge voltage is relatively high Low, the withstand voltage strength is less than one-tenth of the insulator bulk phase and vacuum breakdown voltage, which seriously limits the withstand voltage strength and operation stability of vacuum high-voltage equipment [Li S, Nie Y, Min D, et al.Research Progress on Vacuum Surface Flashover of Solid Dielectrics[J].Transactions of China Electrotechnical Society.2017,32(8):1-9.]. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B17/42H01B17/50H01B19/00H01B19/04
CPCH01B17/50H01B17/42H01B19/00H01B19/04
Inventor 霍艳坤刘文元柯昌凤陈昌华程军郭跃文唐运生
Owner NORTHWEST INST OF NUCLEAR TECH
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