Aluminum oxide multiphase ceramic insulation part and preparation method thereof

A composite ceramic and ceramic insulation technology, applied in the field of power cables, can solve the problems of unsatisfactory mechanical properties of electric ceramics, thermal shock resistance needs to be improved, etc., and achieve the effect of increasing fracture surface energy, high hardness and high melting point

Inactive Publication Date: 2018-12-28
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical properties of the electric ceramics obtained so far are still unsatisfactory, and their thermal shock resistance needs to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The preparation method of the porcelain sleeve of the cable terminal, the specific process is as follows:

[0045] 1) High-purity industrial alumina (purity greater than 99.5%) is used, with a particle size of 1 μm to 5 μm, and is calcined at 1600 ° C for 12 hours in an air atmosphere to fully transform it into α-Al 2 o 3 , and then the resulting α-Al 2 o 3 The powder is well ground.

[0046] 2) In parts by weight, accurately weigh 75 parts of α-Al 2 o 3 powder, 25 parts ZrO 2 , 5 copies of Y 2 o 3 , 2 parts of MgO and 2 parts of CaO, where Y 2 o 3 , MgO and CaO are analytically pure, ZrO 2 The particle size of the powder is 100-200nm, and the α-Al 2 o 3 , Y 2 o 3 , MgO, CaO and ZrO 2 The powders were fully ground respectively; then the ground raw materials of each component were stirred and mixed in absolute ethanol, and dispersed by ultrasonic waves for 30 minutes; then placed in a ball mill for 36 hours, and then placed in a rotary evaporator at 100 ° ...

Embodiment 2

[0052] Example 2 is basically the same as Example 1, except that the raw material ratio of the ceramic powder is different: specifically, in step 2) by weight, 70 parts of α-Al 2 o 3 powder, 30 parts ZrO 2 , 5 copies of Y 2 o 3 , 2 parts of MgO and 2 parts of CaO.

[0053] The sample of the obtained cable terminal porcelain sleeve is tested:

[0054] The average density of the sample of the cable terminal porcelain sleeve is 4.37g / cm 3 ;Adopt the three-point method, do four-way bending test, the average bending strength (room temperature) of the cable terminal porcelain sleeve sample is 546MPa; The temperature cycle test adopts the method of heating and rapid cooling, repeated 10 times, and then by measuring the residual resistance The bending strength is obtained from its thermal shock resistance, and finally the bending strength loss rate is 5% when the temperature difference of thermal shock resistance rises to 454°C.

Embodiment 3

[0056] Example 3 is basically the same as Example 1, except that the raw material ratio of the ceramic powder is different: specifically, in step 2) by weight, 65 parts of α-Al 2 o 3 powder, 35 parts ZrO 2 , 5 copies of Y 2 o 3 , 2 parts of MgO and 2 parts of CaO.

[0057] The sample of the obtained cable terminal porcelain sleeve is tested:

[0058] The average density of the sample of the cable terminal porcelain sleeve is 4.45g / cm 3 ;Adopt the three-point method, do four-way bending test, the average bending strength (room temperature) of the cable terminal porcelain sleeve sample is 573MPa; The temperature cycle test adopts the method of heating and rapid cooling, repeated 10 times, and then by measuring the residual resistance The flexural strength is obtained from its thermal shock resistance, and finally the flexural strength loss rate is 5% when the thermal shock resistance temperature difference rises to 468°C.

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Abstract

The invention relates to an aluminum oxide multiphase ceramic insulation part, and a preparation method thereof. Raw materials for preparing the aluminum oxide composite ceramic insulation part comprise alpha-phase aluminum oxide, nano-zirconia, and a sintering aid, wherein the weight of the nano-zirconia is 15%-35% of the total weight of the alpha-phase aluminum oxide and the nano-zirconia; the weight of the sintering aid is 8%-10% of the total weight of the alpha-phase aluminum oxide and the nano-zirconia; and the sintering aid comprises yttrium oxide, calcium oxide and magnesium oxide. Thealuminum oxide multiphase ceramic insulation part provided by the invention has the advantages that alpha-Al2O3 is used as a base material, and appropriate amounts of the nano-zirconia and the sintering aid are added, so that the fracture toughness and thermal shock resistance of the Al2O3 multiphase ceramic insulation part can be improved through the phase transformation toughening of ZrO2, and the Al2O3 multiphase ceramic insulation part can further achieve high thermal shock resistance and relatively high mechanical strength.

Description

technical field [0001] The invention relates to the power cable industry, in particular to an alumina composite ceramic insulator and a preparation method thereof. Background technique [0002] With the rapid development of the national economy, the scale of the power network is also growing. At the same time, people have higher and higher requirements for the reliability of power supply, which requires that all equipment in the power network can operate stably and reliably for a long time. As an important electrical equipment, an insulator is defined in the national standard GB / T2009.B-1995 "Electrician Terminology Insulator" as a device for electrical insulation and mechanical fixation of electrical equipment or conductors at different potentials. Insulators are insulating materials of a certain shape equipped with metal attachments. Due to the characteristics of certain mechanical strength, cold and hot abrupt change, excellent insulation performance, high chemical stab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/64
CPCC04B35/10C04B35/622C04B35/64C04B2235/3244C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607
Inventor 徐研单鲁平张珏卞佳音郑志豪贺伟徐涛何泽斌张烨
Owner GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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