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Preparation method of high-strength electroceramic

A high-strength, electric porcelain technology, applied to clay products, other household utensils, household utensils, etc., can solve the problem of single reinforcement of corundum particles, and achieve the effect of improving the strengthening and toughening effect, high strength and toughness

Inactive Publication Date: 2016-01-20
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies in the prior art, the purpose of the present invention is to overcome the limitation of single reinforcement of corundum particles in high-strength electric porcelain, and provide a method for preparing high-strength electric porcelain synergistically reinforced by mullite whiskers and corundum particles, so as to further improve The strength and fracture toughness of electric ceramic materials better meet the needs of my country's UHV power transmission and transformation projects

Method used

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  • Preparation method of high-strength electroceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 : A method for preparing high-strength electric porcelain synergistically reinforced by mullite whiskers and corundum particles, specifically:

[0031] (1) Mix calcined bauxite, mullite, high plastic clay and feldspar according to the following parts by mass:

[0032] Calcined bauxite: 25 parts;

[0033] Mullite: 30 parts;

[0034] High plastic clay: 30 parts;

[0035] Feldspar: 15 parts;

[0036] Among them, calcined bauxite, mullite and feldspar are all powders with an average particle size of less than 10 microns;

[0037] (2) After mixing the raw materials, add water with the same total mass as the solid raw materials, and ball mill for 3 hours to obtain a slurry;

[0038] (3) Sieve the slurry, remove iron, and obtain mud cake after dehydration by pressure filtration;

[0039] (4) The mud cake is roughed and stale for more than 24 hours, and then extruded with a vacuum mud mixer under the condition of an absolute pressure of 4kPa to obtain an electr...

Embodiment 2

[0042] Example 2 : A method for preparing high-strength electric porcelain synergistically reinforced by mullite whiskers and corundum particles, specifically:

[0043] (1) Mix calcined bauxite, mullite, high plastic clay and feldspar according to the following parts by mass:

[0044] Calcined bauxite: 30 parts;

[0045] Mullite: 30 parts;

[0046] High plastic clay: 20 parts;

[0047] Feldspar: 20 parts;

[0048] Among them, calcined bauxite, mullite and feldspar are all powders with an average particle size of less than 10 microns;

[0049] (2) After mixing the raw materials, add water with the same total mass as the solid raw materials, and ball mill for 5 hours to obtain a slurry;

[0050] (3) Sieve the slurry, remove iron, and obtain mud cake after dehydration by pressure filtration;

[0051] (4) The mud cake is aged for more than 24 hours after being roughed, and then extruded into a wet electric ceramic billet of the required size with a vacuum mud mixer under th...

Embodiment 3

[0054] Example 3 : A method for preparing high-strength electric porcelain synergistically reinforced by mullite whiskers and corundum particles, specifically:

[0055] (1) Mix calcined bauxite, mullite, high plastic clay and feldspar according to the following parts by mass:

[0056] Calcined bauxite: 20 parts;

[0057] Mullite: 20 parts;

[0058] High plastic clay: 35 parts;

[0059] Feldspar: 25 parts;

[0060] Among them, calcined bauxite, mullite and feldspar are all powders with an average particle size of less than 10 microns;

[0061] (2) After mixing the raw materials, add water with the same total mass as the solid raw materials, and ball mill for 4 hours to obtain a slurry;

[0062] (3) Sieve the slurry, remove iron, and obtain mud cake after dehydration by pressure filtration;

[0063] (4) The mud cake is aged for more than 24 hours after being roughed, and then extruded into a wet electric ceramic billet of the required size with a vacuum mud mill under the c...

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Abstract

The invention discloses a preparation method of high-strength electroceramic. The preparation method includes the specific technological steps that 1, the high-strength electroceramic is prepared from, by mass, 20-30 parts of calcined bauxite, 20-30 parts of mullite, 20-35 parts of high plastic clay and 15-25 parts of feldspar; 2, after all raw materials in step 1 are mixed, water is added, ball-milling is conducted, and slurry is obtained; 3, the slurry is subjected to sieving and iron removal, and mud cakes are obtained after pressure filtration dehydration; 4, the mud cakes are subjected to aging for over 24 hours after coarse milling, then the mud cakes are extruded into electrical porcelain wet billets of the required sizes through a vacuum deairing machine, and green bodies are obtained through fettling and drying; 5, the green bodies are placed in a drawer type or tunnel type kiln and sintered at the temperature of 1260-1330 DEG C for 24-48 hours; then cooling is conducted, and high-strength electroceramic products are output from the kiln. The high-strength electroceramic material is wide in raw material source, good in process performance, low in manufacturing cost and particularly suitable for being used for manufacturing high-strength porcelain insulators used for extra-high voltage and super-high voltage power transformer lines and power stations.

Description

technical field [0001] The invention relates to the technical field of ceramic preparation, in particular to a preparation method of high-strength electric porcelain. Background technique [0002] With the rapid development of UHV power transmission and transformation projects in my country, higher and higher requirements are put forward for the mechanical strength of porcelain insulating materials used in power transmission and transformation lines and power stations. In order to improve the mechanical strength of porcelain insulating materials, calcined bauxite is usually used as raw material to introduce high-strength corundum particles for reinforcement. The bending strength of this particle-reinforced high-strength electric porcelain material can generally reach 160MPa. However, for large-sized UHV products, this strength value is still difficult to meet the requirements, especially the fracture toughness of the material is low, generally at 3MPa m 1 / 2 about. To furt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/26C04B33/36
Inventor 肖汉宁程娟
Owner HUNAN UNIV
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