Toughened ceramic for insulator and preparation method of toughened ceramic

Abstract

The invention discloses toughened ceramic for an insulator and a preparation method of the toughened ceramic. The toughened ceramic is prepared from, by weight, 2-3 parts of aluminum borate whiskers, 70-80 parts of silicon carbide micro powder with the proper size, 20-30 parts of aluminum nitride micro powder with the proper size, 1-1.5 parts of calcium fluoride powder, 10-15 parts of carbon powder, 10-15 parts of molybdenum silicide, 6-8 parts of ethyl orthosilicate, 3-5 parts of absolute ethyl alcohol, 3-5 parts of purified water and 1.5-2.5 parts of thermoplastic phenolic resin. By means of the steps of raw material preparation, insulator pre-preparation, insulator sintering and completing, the high-tenacity insulation ceramic with the volume resistivity larger than or equal to 2*1,013 omega-cm, the dielectric strength larger than or equal to 750 kV/cm, the thermal conductivity larger than or equal to 25 W/m.K, the bending strength larger than or equal to 400 Mpa, the Young modulus larger than or equal to 320 Gpa and the breaking tenacity larger than or equal to 25 Mpa is formed. The toughened ceramic is good in economical efficiency, resistant to high temperature oxidation and high in breaking tenacity, and the functions of main materials complement one another.

Description

technical field [0001] The invention relates to the field of electronic components, in particular to a toughened ceramic for insulators and a manufacturing method thereof. Background technique [0002] Insulators are special insulation controls that can play an important role in overhead transmission lines. [0003] In the early years, insulators were mostly used on utility poles, and gradually developed into high-voltage wire connection towers where many disc-shaped insulators were hung at one end. It was used to increase the creepage distance, usually made of glass or ceramics, and was called an insulator. Insulators play two basic roles in overhead transmission lines, namely supporting wires and preventing current from returning to the ground. These two roles must be guaranteed; at the same time, insulators should have sufficient electrical insulation strength, moisture resistance and high temperature resistance. [0004] Among the relevant patents that have been applied...

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Problems solved by technology

[0004] Among the relevant patents that have been applied in China, the patent "High Insulation Silicon Carbide / Boron Nitride Ceramic Material and Its Preparation Method" (application number: 201310294766.0, publication date: 2015-01-14) discloses a silicon carbide / nitrogen boron oxide ceramic material and its preparation method, but these two materials are brittle materials, their fracture toughness is not higher than 6Mpa, easy to break or break under transportation and other vibration conditions, and the invention belongs to high temperature sintering (1900°C -2300°C) heating isostatic pressing, the cost is too high to carry out industrial production. On the other hand, due to the low oxidation temperature of silicon carbide, when the high temperature is generated by an electrical short circuit, the insulator is prone to surface oxidation and leads to insulation performance Reduced; the patent "An Inorganic Nanocomposite Ceramic with Insulation and Heat Conduction and Its Preparation Method and Application" (Application No.: 201410310359.9, Publication Date: 2015-12-30) discloses an inorganic nanocomposite ceramic whose active ingredients are After being made into ceramics, they are all highly brittle materials, without toughening treatment, and at the same time, the comprehensive performance advantages of the material have not been brought into play

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