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ZTA ceramic material preparation method and material prepared from method

A technology for ceramic materials and raw materials, which is applied to the preparation method of ZTA ceramic materials and the field of materials prepared, can solve the problems of agglomeration, uneven size, and sequence errors, so as to improve the performance of the sintered body, enhance the sintering temperature, and improve the selective effect

Active Publication Date: 2019-07-16
NINGBO TOPTEK ADVANCED CERAMICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] But its shortcoming is that aluminum chloride solution, ZrOCl 2 solution, Y(NO 3 ) 3 During the co-precipitation process, the Al 3+ 、Zr 4+ and Y 3+ to OH - The competition of nano-scale γ-alumina particles, zirconium hydroxide, and yttrium hydroxide has a sequence error in the precipitation. The substances that precipitate first are agglomerated with stirring during the subsequent precipitation process, forming particles with uneven sizes. The particles will also affect the size distribution of subsequent precipitation and transformation particles, resulting in the formation of more particles with uneven sizes or even agglomeration, resulting in uneven mixing of materials in the mixed gel, uneven particle size of the mixed powder and uneven mixing of ingredients. The improvement of physical properties such as strength, hardness and wear resistance of ZTA ceramics has limitations, so it needs to be improved

Method used

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  • ZTA ceramic material preparation method and material prepared from method

Examples

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Embodiment 1

[0061] A kind of ZTA ceramic material, its composition comprises aluminum oxide, zirconium oxide and chromium oxide, and its preparation method is as follows,

[0062] S1: Prepare a 0.3mol / L chromium chloride solution with chromium chloride as raw material, slowly add ammonia water dropwise to the solution, adjust the pH value to 10-12, and stir for 2-5h to produce chromium hydroxide gel. After the obtained chromium hydroxide gel is repeatedly washed with high-purity water, it is dried at an ambient temperature of 60°C for subsequent use;

[0063] S2: Reacting excess high-purity metallic aluminum with 20% dilute hydrochloric acid, after filtering, purifying the obtained aluminum chloride with ion exchange resin and activated carbon to remove impurities to obtain an aluminum chloride solution;

[0064] S3: Distilling the aluminum chloride solution obtained in S2 under reduced pressure to obtain high-purity aluminum chloride powder;

[0065] S4: Heat the high-purity aluminum ch...

Embodiment 2

[0099] A ZTA ceramic material, based on the basis of Example 1E, the difference is that before heating the autoclave in S6, nanometer monoclinic zirconia seed crystals are no longer added to the autoclave, but the autoclave is directly heated To 150°C-250°C, pressurize the reactor to 3-5MPa, keep stirring for 2 hours, and filter to obtain nanometer 2Y hydrated zirconia gel particles.

Embodiment 3

[0101] A ZTA ceramic material, based on Example 1E, the difference is that in S1, a sodium hydroxide solution with a concentration of 20 wt% is used to adjust the pH value of the chromium chloride solution.

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Abstract

The invention relates to a zirconia toughened alumina (ZTA) ceramic material, and discloses a ZTA ceramic material preparation method and a material prepared from the method. The preparation method comprises the following steps: mixing independently prepared chromium hydroxide gel, gamma alumina particles and nano 2Y hydrated zirconia gel to prepare a mixed gel, then carrying out calcining, carrying out airflow crushing, carrying out grinding to obtain slurry, and carrying out spray granulation to obtain raw material ZTA composite ceramic powder, carrying out isostatic pressing molding on theraw material ZTA composite ceramic powder to obtain a ZTA ceramic blank, and then carrying out high-temperature sintering to obtain the ZTA ceramic material. The particle sizes of the nanoscale gammaalumina particles and the 2Y hydrated zirconia gel are controlled, and the nanoscale gamma alumina particles are prepared by mixing aluminum chloride steam with hydrogen and oxygen and then carrying out combustion. The ratio of the aluminum chloride steam to the hydrogen and oxygen are controlled during combustion and the gas pressure during combustion are controlled, so that particle size fluctuation is reduced, the mixing uniformity degree and the granularity of components in coarse ZTA ceramic powder and the raw material ZTA composite ceramic powder are controlled, and properties such as strength, hardness, wear resistance and the like of the toughened ZTA ceramic material obtained by sintering are improved.

Description

technical field [0001] The invention relates to a ZTA ceramic material, in particular to a method for preparing a ZTA ceramic material and a material prepared therefrom. Background technique [0002] ZTA ceramics is a new type of composite ceramic material with alumina as the main crystal phase and metastable tetragonal zirconia as the strengthening and toughening phase. Toughening effect, evenly dispersing the metastable zirconia particles into the alumina ceramics, not only can inhibit the abnormal grain growth of the alumina ceramics during sintering, but also metastable when the ceramic body is subjected to external stress. The state of zirconia undergoes a martensitic phase transformation from tetragonal phase to monoclinic phase, which can absorb external stress energy. [0003] The preparation method of the existing ZTA ceramic material is as the Chinese patent "a kind of aluminum oxide antistatic ceramic material and its preparation method" of authorized announcemen...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622C04B35/626
CPCC04B35/10C04B35/622C04B35/62685C04B2235/3241C04B2235/3244C04B2235/5445C04B2235/5454C04B2235/602C04B2235/656C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96
Inventor 杨辉罗杰锋龚晶晶
Owner NINGBO TOPTEK ADVANCED CERAMICS CO LTD
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