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Method for preparing partial stabilization zirconium oxide ceramic capable of increasing thermal shock resistance

A technology for stabilizing zirconia and thermal shock resistance, which is applied in the field of partially stabilized zirconia ceramics, can solve the problems of uneven phase distribution of PSZ ceramics, limited ion diffusion of stabilizers, and unsatisfactory thermal shock resistance of materials. Uniform phase distribution, improved thermal shock resistance, and stable composition

Inactive Publication Date: 2008-03-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Through the pre-firing of the mixed powder, the diffusion of stabilizer ions to the matrix is ​​also very limited, so the phase distribution of the prepared PSZ ceramics is not uniform, and the thermal shock resistance of the material is not ideal

Method used

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  • Method for preparing partial stabilization zirconium oxide ceramic capable of increasing thermal shock resistance

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Experimental program
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Effect test

Embodiment 1

[0018] (1) Weigh 3mol% of Y 2 o 3 and ZrO 2 Powder, mixed oxides are obtained after ball milling;

[0019] (2) Add 5wt% polyvinyl alcohol solution as an adhesive to the mixed oxide powder, the weight ratio of the adhesive to the oxide powder is 1:12, and stir evenly;

[0020] (3) The material is pressed into tablets by 13t mechanical pressure, pre-fired at 600°C, and kept for 3 hours;

[0021] (4) The pre-fired sample is ground through a planetary mill, and the obtained ZrO 2 -Y 2 o 3 Powder, the maximum particle size is 18μm;

[0022] (5) The powder was mechanically pressed and sintered in an air atmosphere at 1600°C to prepare Y 2 o 3 -PSZ ceramics.

[0023] Synthetic Y 2 o 3 - The tetragonal phase is evenly distributed in the PSZ ceramic matrix. Y mixed with oxide powder and pre-fired 2 o 3 -Compared with PSZ ceramics, the PSZ tetragonal phase prepared by the method of the present invention is fine and the degree of uniform distribution is obviously improved. ...

example 2

[0025] (1) Weigh 7mol% of MgO and ZrO 2 Powder, mixed by ball milling;

[0026] (2) Add 8wt% polyvinyl alcohol solution as an adhesive to the mixed oxide powder, the weight ratio of the adhesive to the oxide powder is 1:10, and stir evenly;

[0027] (3) The material is pressed into tablets by 10 tons of mechanical pressure, and the flakes are pre-fired at 820°C and kept warm for 2 hours;

[0028] (4) The pre-fired sample is ground by a planetary mill, and the maximum particle size of the synthesized powder is 17 μm;

[0029] (5) ZrO will be obtained 2 -MgO powder was mechanically pressed into blocks and sintered in an air atmosphere at 1680°C to prepare MgO-PSZ ceramics.

[0030] Compared with the co-precipitation method, the content of the stabilizer is basically constant during the operation of the method of the present invention, the phase composition of MgO-PSZ is controlled within the set range, and has a higher monoclinic phase, a lower cubic phase and a certain tetra...

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Abstract

The present invention is the preparation process of partially stable zirconia ceramic with high heat shock resistance, and belongs to the field of functional ceramic and inorganic material preparing technology. The partially stable zirconia ceramic material is prepared through mixing zirconia with stabilizer yttria or magnesia, adding adhesive and tabletting, pre-sintering at 500-900 deg.c, and ball milling into powder of size below 20 microns. Compared with available technological process, the preparation process of the present invention has the advantages including precise control on stabilizer content, improved quadratic phase distribution homogeneity, obviously raised heat shock resistance, simple process, high repeatability and low cost in equipment.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional ceramics and inorganic materials, in particular to a method for preparing partially stabilized zirconia ceramics (PSZ) with improved thermal shock resistance. Background technique [0002] Thermal shock resistance of ceramics refers to the ability of a material to resist rapid changes in temperature without rupturing. Partially stabilized zirconia ceramics (PSZ) have a certain proportion of cubic phase, tetragonal phase and monoclinic phase, and the expansion coefficient is low. At the same time, the phase change toughening effect makes the material have excellent thermal shock resistance. From the toughening mechanism of PSZ, it can be seen that controlling the phase composition of the material and the uniform distribution of the tetragonal phase is the key and guarantee for improving the thermal shock resistance. These factors are closely related to the preparation process of ...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/04C04B35/622
Inventor 连芳
Owner UNIV OF SCI & TECH BEIJING
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