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Preparation method for submicron zirconia-toughened aluminium oxide powder and ceramic thereof

A technology of alumina powder and zirconia, which is applied in the field of preparation of submicron zirconia toughened alumina ZTA powder and ceramics, can solve the problems of high cost, difficult industrialization, large powder particles, etc., and achieve low cost , It is convenient for industrialized production and the process is simple

Active Publication Date: 2015-09-16
广西平果铝朗琨科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of large particles, wide particle size distribution, high cost and difficulty in industrialization of the powder prepared by the above-mentioned ZTA powder, the present invention provides a method for preparing submicron zirconia toughened alumina ZTA powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to the mass ratio of industrial aluminum hydroxide and zirconium oxychloride 9:1, take 90 kg of aluminum hydroxide and 10 kg of zirconium oxychloride; take 0.5 kg of aluminum fluoride, 0.5 kg of aluminum chloride, 0.5 Kilograms of calcium oxide and the five materials were mixed together for 2 hours, placed in a high-temperature furnace to raise the temperature to 1500°C at 3°C / min, and kept for 2 hours to obtain ZTA raw powder. Mix ZTA raw powder, ammonium citrate and water into a polyurethane ball mill tank for wet ball milling for 10 hours, and obtain the particle size of the powder by spray drying D 50 0.4 μm submicron ZTA powder. Among them, the grinding ball is 99 porcelain alumina, and the diameter of the grinding ball is 3 mm; ZTA powder: grinding ball: water = 1: 1.

[0025] The above submicron ZTA powder is formed into a ceramic green body by dry pressing, placed in a high temperature furnace at a rate of 5 °C / min to 1650 °C for sintering, and kept ...

Embodiment 2

[0027] According to the mass ratio of industrial aluminum hydroxide to zirconium oxychloride 8:2, take 80 kg of aluminum hydroxide and 20 kg of zirconium oxychloride; according to the ratio of 1:0.1~1.5, take 0.3 kg of aluminum fluoride and 0.8 kg of ammonium chloride and 0.8 kg of yttrium oxide were mixed for 1.5 hours, placed in a high-temperature furnace and raised to 1450° C. at a rate of 4° C. / min, and kept at a temperature of 4 hours to obtain ZTA raw powder. Mix ZTA raw powder, ammonium polyacrylate and water into a polyurethane ball mill tank for wet ball milling for 6 hours, and obtain the particle size of the powder by spray drying D 50 0.7 μm submicron ZTA powder. Among them, the grinding ball is 99 porcelain alumina, and the diameter of the grinding ball is 3~10mm. ZTA powder: grinding ball: water=1:1~2:0.5~1.

[0028] The above-mentioned submicron ZTA powder is formed into a ceramic green body by dry pressing, placed in a high-temperature furnace at a rate of 5...

Embodiment 3

[0030] According to the mass ratio of industrial aluminum hydroxide to zirconium oxychloride 3:1, take 75 kg of aluminum hydroxide, 25 kg of zirconium oxychloride, and 0.4 kg of ammonium fluoride; Kilograms of yttrium oxide were mixed for 1.5 hours, placed in a high-temperature furnace to raise the temperature to 1350° C. at 5° C. / min, and kept for 6 hours to obtain ZTA raw powder. Mix ZTA raw powder, sodium polyphosphate and water into a polyurethane ball mill tank for wet ball milling for 18 hours, and obtain the particle size of the powder by spray drying D 50 0.3 μm submicron ZTA powder. Among them, the grinding ball is 99 porcelain alumina, and the diameter of the grinding ball is 3-10 mm. ZTA powder: grinding ball: water=1:1~2:0.5~1.

[0031] The above-mentioned submicron ZTA powder was molded into a ceramic green body by gel injection molding, placed in a high-temperature furnace at a rate of 5°C / min to 1550°C for sintering, and kept for 4 hours to obtain submicron Z...

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Abstract

The invention discloses a preparation method for a submicron zirconia-toughened aluminium oxide powder and a ceramic thereof. The preparation method is characterized by comprising the following steps: (1) mixing industrial aluminium hydroxide, zirconium oxychloride, a composite mineralizer and a stabilizer for 1-2 hours; (2) heating to 1350-1500 DEG C at a heating speed of 3-5 DEG C and carrying out a calcining treatment for 2-8 hours to obtain ZTA powder; (3) mixing the ZTA powder, a dispersant and water and carrying out wet-method ball-milling, and carrying out spray-drying, thereby obtaining a submicron ZTA powder with the powder grain size D50 of 0.2-0.8mum. The obtained submicron ZTA powder is shaped into a ceramic biscuit, and the ceramic biscuit is sintered at a high temperature of 1500-1650 DEG C for 2-5 hours, so as to obtain a submicron ZTA ceramic with the relative density of 97-99%. The method is low in cost, simple in technique process, and convenient for realization of industrial production; the powder is small in raw crystalline grain size, narrow in distribution, and capable of being applied to the field of high-technology ceramics.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic non-metallic mineral powder and ceramics, in particular to a preparation method of submicron zirconia toughened alumina ZTA powder and ceramics. Background technique [0002] Alumina ceramics are more and more popular as high-performance ceramic materials. However, the low fracture toughness of alumina ceramics limits its wide application. In order to improve the mechanical properties of alumina ceramics, methods such as zirconia phase transformation toughening, particle dispersion strengthening or fiber and whisker reinforcement are used to improve. Among them, the use of zirconia phase transformation toughening method is widely used, and its composite material is zirconia toughened alumina ZTA ceramics. [0003] A good preparation process is the key to obtain high performance ZTA ceramics. The high-performance submicron ZTA composite powder is a necessary prerequisite. The u...

Claims

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Application Information

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IPC IPC(8): C04B35/119C04B35/626
Inventor 许杰曹余良许华
Owner 广西平果铝朗琨科技有限公司
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