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Preparation method of columnar crystal alumina/zirconia composite ceramic powder

A technology of crystalline alumina and composite ceramics, which is applied in the field of preparation of columnar crystalline alumina/zirconia composite ceramic powder, which can solve the problems of insufficient ceramic strength and toughness, less columnar crystal content, uneven distribution, etc., and increase crack propagation path, uniform distribution, and the effect of improving mechanical properties

Active Publication Date: 2021-10-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the technical problems that the columnar crystal ceramics induced by the existing method have less columnar crystal content, uneven distribution, and large grain size, resulting in insufficient strength and toughness of the ceramic, and provides a columnar crystal alumina / zirconia composite Preparation method of ceramics

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  • Preparation method of columnar crystal alumina/zirconia composite ceramic powder
  • Preparation method of columnar crystal alumina/zirconia composite ceramic powder
  • Preparation method of columnar crystal alumina/zirconia composite ceramic powder

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specific Embodiment approach 1

[0027] Specific implementation mode 1: The preparation method of columnar crystal alumina / zirconia composite ceramics in this implementation mode specifically includes the following steps:

[0028] Step 1: drying the aluminum powder and diluent; the diluent is a mixture of zirconia and alumina, wherein alumina accounts for 0-93% of the total mass of the diluent;

[0029] Step 2: Mix the dried aluminum powder and diluent, ball mill, and sieve after ball milling to obtain a mixed material; wherein the mass fraction of the aluminum powder in the mixed material is 12%-40%, and the mass fraction of the diluent is 60%- 88%;

[0030] Step 3: Put the mixed material into the high-pressure reactor, and fill the high-pressure reactor with O 2 or O 2 Mixed gas, the lower end of the high-pressure reactor is equipped with a nozzle, the diameter of the nozzle is 1-6mm, the mixed material is ignited, and the high-temperature combustion synthesis reaction is carried out. The reaction tempera...

specific Embodiment approach 2

[0032] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 2, a dry inducer is also added for ball milling to obtain a mixed material composed of aluminum powder, diluent and inducer; wherein the amount of inducer added is The proportion in the mixed material is less than 6wt%. Others are the same as in the first embodiment.

[0033] In addition to inducing nano columnar crystal seeds (supersaturated solid solution) in the process of rapid cooling and solidification of the alumina / zirconia composite melt, the present invention can also induce columnar crystal seeds by adding an inducer, so that rapid cooling can be achieved. The "double induction" of inducing columnar crystal seeds and additives inducing columnar crystal seeds can greatly reduce the amount of inducing agent added. This is completely different from the existing process methods.

[0034] Excessive triggering agent content will deteriorate some properties of c...

specific Embodiment approach 3

[0036] Specific embodiment three: the difference between this embodiment and specific embodiment two is: the inducer is MgO, TiO 2 , SiO 2 、Cr 2 o 3 , Y 2 o 3 , CoO, La 2 o 3 , CeO 2 、Nd 2 o 3 、Sm 2 o 3 、Eu 2 o 3 、Gd 2 o 3 , Tb 2 o 3 、Dy 2 o 3 、Ho 2 o 3 、Er 2 o 3 , Yb 2 o 3 、Lu 2 o 3 , SrO, NiO or a mixture of several components. Others are the same as in the second embodiment.

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Abstract

The invention discloses a preparation method of columnar crystal aluminum oxide / zirconium oxide composite ceramic powder, relates to the field of aluminum oxide / zirconium oxide composite ceramics, and aims to solve the problems that columnar crystals induced by columnar crystal ceramics prepared by a conventional method are low in content, non-uniform in distribution and large in grain size, so that the strength and toughness of the ceramics are insufficient. The method comprises the steps: 1, drying aluminum powder and a diluent; 2, mixing the aluminum powder and the diluent, and carrying out ball milling and sieving to obtain a mixed material; and 3, filling the mixed material into a high-pressure reactor, filling O2 or O2 mixed gas, arranging a nozzle at the lower end, igniting the mixed material, carrying out high-temperature combustion synthesis reaction, forming a high-temperature melt after the reaction is finished, keeping the temperature, opening the nozzle, spraying out the melt, and carrying out liquid-phase cooling to obtain the columnar crystal aluminum oxide / zirconium oxide composite ceramic powder. The prepared ceramic powder has the nano columnar crystal seed, the content of the columnar crystal seed is high, and the ceramic powder has high strength and toughness after being sintered. The method is applied to the field of columnar crystal ceramics.

Description

technical field [0001] The invention relates to the field of alumina / zirconia composite ceramics, in particular to a method for preparing columnar crystal alumina / zirconia composite ceramic powder. Background technique [0002] Various oxide ceramic materials have been widely used in various fields due to their excellent special properties (such as: high temperature resistance, corrosion resistance, wear resistance, etc.). In particular, alumina and zirconia ceramics have a large output and excellent performance, and have become the most widely used ceramic materials. Oxide ceramics with an equiaxed microstructure usually have relatively low fracture toughness and fracture strength, which greatly limits their application fields. For columnar crystal oxide ceramics, the fracture toughness and fracture strength will be greatly improved, especially the in-situ self-generated and uniformly distributed columnar crystal oxide ceramics have better performance. [0003] For most c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/48C04B35/626
CPCC04B35/10C04B35/48C04B35/62605C04B2235/5445C04B2235/5454C04B2235/96
Inventor 郑永挺于永东刘旭东袁雨晨
Owner HARBIN INST OF TECH
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