A kind of electric porcelain with composite seed crystal added and its preparation method

A technology of seed crystal and electric porcelain, which is applied in the field of high-voltage electric porcelain, can solve problems such as low strength, poor process level, and uneven product quality, and achieve the effect of simple preparation of raw materials, stable and mature process, and increased elastic strain energy

Inactive Publication Date: 2016-09-07
FUZHOU UNIV
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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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  • A kind of electric porcelain with composite seed crystal added and its preparation method
  • A kind of electric porcelain with composite seed crystal added and its preparation method

Examples

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preparation example Construction

[0024] The preparation method comprises the following steps:

[0025] (1) Batching; raw materials are baked at 90~100°C for 12 hours, weighed according to the formula, and compounded;

[0026] (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;

[0027] (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;

[0028] (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;

[0029] (5) Drying; first dry in the shade for 12 hours, then bake at 90~100°C for 48 hours;

[0030] (6) Kiln sintering; the heating rate is 5°C / min, the sin...

Embodiment 1

[0033] Embodiment 1: Preparation and sintering of electric porcelain

[0034] 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, composite seed crystal ), and then perform ball milling, iron removal, mud squeezing, aging, mud refining, molding, drying and other processes in sequence according to the aforementioned ceramic preparation steps. The dried samples were placed in a programmable furnace for sintering. Add 2% composite seed (CaB 2 o 4 Seed and CaB 4 o 7 The phase composition of the sample after sintering at 1230℃ is as follows: figure 1 shown. According to quantitative analysis, the mass percentage of mullite phase (ICCD79-1458) contained in this sample is 14.5%. The fracture strength of the sample is low, only 1256±12MPa.

Embodiment 2

[0035] Embodiment 2: 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, composite seed crystal ), and then prepare electric porcelain according to the process of Example 1. like figure 1 As shown, add 5% composite seed (CaB 2 o 4 Seed and CaB 4 o7 After sintering at 1230 ℃, the mass percentage of mullite phase is 16.1%. The breaking strength of the sample was 1312±11 MPa.

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Abstract

The invention discloses an electroceramic added with compound seed crystal and a preparation method of the electroceramic. The electroceramic is prepared from such raw materials in percentage by weight as 10-20% of SiO2, 10-25% of Al2O3, 10-20% of Fe2O3, 1-5% of TiO2, 2-10% of CaO, 0-3% of MgO, 5-15% of K2O, 3-8% of Na2O and 2-20% of compound seed crystal. As the compound seed crystal (CaB2O4 seed crystal and CaB4O7 seed crystal) is added, the sintering process of the electroceramic can be accelerated, the density of the electroceramic can be increased and the breaking strength of the electroceramic can be remarkably enhanced; besides, due to the addition of the compound seed crystal, the crystallization of the mullite phase also can be effectively promoted, and therefore, the mechanical strength of the electroceramic can be remarkably improved. The preparation raw materials of the electroceramic are simple and easily available, and the process is stable and mature, and satisfies the practical and industrial conditions.

Description

technical field [0001] The invention belongs to the field of high-voltage electric ceramics, in particular to a composite seed crystal (CaB 2 o 4 Seed and CaB 4 o 7 Seed crystal) and its preparation method. 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 al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/185C04B35/622
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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