High-density magnesium-stabilized zirconia ceramic

A technology for zirconia ceramics and magnesium stabilization, applied in the field of zirconia ceramics, can solve the problems of complex process and high production cost, and achieve the effects of high ion conductivity, high bending strength and good thermal shock resistance

Active Publication Date: 2013-01-09
ZHONGXIANG ZHONGYUAN ELECTRONICS
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The present invention is aimed at the problems that the current magnesium partially stabilized zirconia ceramic materials usually use the chemical precipitation method to produce powder, which must be fired at a temperature higher than 1700 ° C, or formed by isostatic pressing, the process is complicated, and the production cost is high. Provide a high-density magnesium stabilized zirconia ceramic and its preparation process

Method used

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Embodiment Construction

[0020] The ratio of raw materials by mol:

[0021] ZrO 2 90mol% MgO 5mol% Y 2 o 3 0.3mol% CaO 0.3mol% sintering accelerator 0.3wt%;

[0022] The ratio of sintering accelerator by mol is:

[0023] Al 2 o 3 25mol% SiO 2 40mol%

[0024] TiO 2 40mol% Fe 2 o 3 10mol%.

[0025] A. Powder preparation: ball mill the raw materials prepared according to the above ratio, and use a planetary mill for wet grinding for 5-7 hours, dry, then put in a bowl, calcined at 1000-1300°C, pass through a 100-200 mesh sieve, and produce into powder;

[0026] B. Preparation of ceramics:

[0027] a. Mixing: Mix 80kg of powder, 5kg of paraffin, 20kg of polyethylene or polypropylene, and 5kg of oleic acid to make a mixture;

[0028] b. Granulation: the mixture is made into granules through a granulator, ∮3~5mm;

[0029] c. Blank making: injection molding the granules with an injection molding machine to produce a zirconium tube blank for an oxygen battery;

[0030] d. Debinding: put...

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Abstract

The invention relates to a high-density magnesium-stabilized zirconia ceramic which is prepared from the following raw materials: 80-99 mol% of ZrO2, 0.1-10 mol% of MgO, 0.1-0.5 mol% of Y2O3, 0.1-0.5 mol% of CaO and 0.1-5 wt% of sintering accelerator. The preparation technique comprises the following steps: A. preparing powder; and B. preparing ceramic: a. preparing a mixture, b. granulating, c. making a blank, d. discharging adhesive, and e. sintering at high temperature. According to the invention, the firing temperature of the ceramic material is greatly lowered, and the high-density ceramic material can be obtained only at 1600-1690 DEG C; and the relative density is up to 97% or so. The material has the advantages of high bending strength, favorable thermal shock resistance and high ionic conductivity.

Description

technical field [0001] The invention relates to the field of zirconia ceramics. technical background [0002] Magnesium partially stabilized zirconia ceramics have very good thermal shock resistance, so they are used to manufacture oxygen concentration batteries, which are widely used in the metallurgical industry, to measure the oxygen activity of molten metal, and to realize on-line detection during the smelting process. In order to manufacture an oxygen-fixing battery with excellent performance, magnesium-stabilized zirconia ceramics are required to have high bulk density; high mechanical flexural strength; very good thermal shock resistance and high high-temperature ionic conductivity. At present, in order to obtain this excellent performance of magnesium partially stabilized zirconia ceramic materials, chemical precipitation method is usually used to produce powder, which must be fired at a temperature higher than 1700 ° C, or isostatically pressed, which is complicated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622
Inventor 潘晓光杨明江
Owner ZHONGXIANG ZHONGYUAN ELECTRONICS
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