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SrB4O7 seed crystal-containing electrical porcelain and preparation method thereof

A technology of seed crystal and electric porcelain, which is applied in the field of high-voltage electric porcelain, can solve the problems of uneven product quality, insufficient strength of electric porcelain, poor process level, etc., and achieve the effects of improving fluidity, stable and mature process, and increasing density

Inactive Publication Date: 2015-08-12
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with similar foreign companies, most of the domestic companies have poor craftsmanship, resulting in uneven product quality
At present, the strength of domestic and ordinary porcelain is 60-80kN / cm 2 , the strength of high-strength porcelain is 100-180kN / cm 2 , 15%-25% lower than the strength of foreign porcelain bodies of the same type
Therefore, the insufficient strength of electric porcelain is the most prominent problem restricting domestic high-voltage electric porcelain

Method used

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  • SrB4O7 seed crystal-containing electrical porcelain and preparation method thereof
  • SrB4O7 seed crystal-containing electrical porcelain and preparation method thereof
  • SrB4O7 seed crystal-containing electrical porcelain and preparation method thereof

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preparation example Construction

[0026] The preparation method comprises the following steps:

[0027] (1) Batching; raw materials are baked at 90~100°C for 12 hours, weighed according to the formula, and compounded;

[0028] (2) Ball milling: zirconium balls are used, the volume ratio of balls to materials is 2:1, and they are passed through a 270-mesh sieve;

[0029] (3) Iron removal, mud squeezing, staleness, and mud refining: Use electromagnetic coils and permanent magnet iron removal equipment to sieve and remove iron. After adding water to squeeze the mud, the moisture content is 22%, the aging time is 72h, and the vacuum degree is 0.05~0.09 Practicing mud under MPa;

[0030] (4) Molding: Extrusion molding is carried out under a vacuum degree of 0.01MPa, and the molded sample is a columnar shape with a diameter of 2.3cm and a length of 13.6cm;

[0031] (5) Drying; first dry in the shade for 12 hours, then bake at 90~100°C for 48 hours;

[0032] (6) Kiln sintering; the heating rate is 5°C / min, the sin...

Embodiment 1

[0035] Embodiment 1: Preparation and sintering of electric porcelain

[0036] According to the ratio of each component in Table 1, weigh a certain amount of raw materials (Puxian soil, Xiaxi soil, panning soil, lithium feldspar, Zhangzhou soil, coke gem, feldspar powder, bauxite, strontium tetraborate Seed crystal), and then follow the aforementioned ceramic preparation steps to carry out ball milling, iron removal, mud squeezing, aging, mud refining, molding and drying in sequence. The dried samples were placed in a programmable furnace for sintering. Such as figure 1 As shown, the fracture strength of the sample added with 2% strontium tetraborate seed crystal is 1286±12MPa, which is higher than the fracture strength of the sample without strontium tetraborate 1156±13MPa.

Embodiment 2

[0037] Embodiment 2: Preparation and sintering of electric porcelain

[0038] According to the ratio of each component in Table 1, weigh a certain amount of raw materials (Puxian soil, Xiaxi soil, panning soil, lithium feldspar, Zhangzhou soil, coke gem, feldspar powder, bauxite, strontium tetraborate seed crystal), and then prepare electric porcelain according to the process of Example 1. Such as figure 1As shown, the fracture strength of the sample added with 5% strontium tetraborate seed crystal was 1342±18MPa.

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Abstract

The invention discloses a SrB4O7 seed crystal-containing electrical porcelain and a preparation method thereof. The SrB4O7 seed crystal-containing electrical porcelain comprises 10-20wt% of SiO2, 10-25wt% of Al2O3, 10-20wt% of Fe2O3, 1-5wt% of TiO2, 2-10wt% of CaO, 0-3wt% of MgO, 5-15wt% of K2O, 3-8wt% of Na2O, and 2-15wt% of SrB4O7 seed crystal. The addition of the SrB4O7 seed crystal promotes the sintering process of an electrical porcelain, improves the compactness of the electrical porcelain, and substantially enhances the rupture strength of the electrical porcelain; and the addition of the SrB4O7 seed crystal also can effectively promote crystallization of a SrAl2Si2O8 phase and a mullite phase in order to substantially improve the mechanical strength of the electrical porcelain. The method has the advantages of simple and easily available raw materials, stable, mature, simple and feasible process, low cost, and meeting of practical and industrial conditions.

Description

technical field [0001] The invention belongs to the field of high-voltage electric ceramics, and in particular relates to a SrB-added 4 o 7 Electric ceramics with seed crystals and methods for their preparation. Background technique [0002] High-voltage electric porcelain refers to electric porcelain products with a rated voltage higher than 1kV. It mainly refers to insulating ceramics used in high-voltage transmission lines, power stations and various electrical appliances, also known as insulators, and is an important part of the electric power industry. High-voltage electric porcelain is divided into silicon electric porcelain and aluminum electric porcelain according to the different chemical components contained in it. Aluminum electric porcelain is divided into aluminum porcelain and high-strength aluminum porcelain. According to the different application fields of electric porcelain, the electric porcelain involved in the present invention Belongs to high-strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/26C04B35/10C04B35/14C04B35/26
Inventor 张腾刘鸿琳杜欣航李巍婷张琪颜佳佳魏颖唐电
Owner FUZHOU UNIV
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