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Rare-earth oxide and manganese oxide co-stable zirconia ceramics and preparation thereof

A technology of rare earth oxides and zirconia ceramics, applied in the field of materials, can solve problems such as low hardness and strength, decline in mechanical properties, and aging of low-temperature performance, and achieve the effects of good stability, easy control of reaction conditions, and sufficient reaction

Inactive Publication Date: 2009-05-27
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the study found that when YSZ is used for a long time in the low temperature range of 100-400 ° C, the isothermal phase transition from the tetragonal phase to the monoclinic phase occurs on the surface of the material, resulting in a sharp decline in mechanical properties, that is, low temperature performance aging
CeO 2 Stable ZrO 2 It has high fracture toughness and good low temperature hydrothermal aging resistance, but the disadvantage is low hardness and strength
sc 2 o 3 Stable ZrO 2 Materials, due to the formation of metastable phases during sintering, the electrical conductivity will drop rapidly and the stability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Analytical pure ZrO 2 , Mn 2 o 3 and Y 2 o 3 According to Zr 0.75 mn 0.2 Y 0.05 o 2 The stoichiometric ratio is weighed, the weighed mixed powder is poured into the mortar, fully mixed and ground, and then the powder is pressed into a 50mm×5mm×2mm under a pressure of 8MPa using a dry pressing molding process. For the green sheet, put the green sheet into a high-temperature tube furnace at a heating rate of 300°C / h, keep it at 1350°C for 12h under an Ar gas atmosphere, and then cool it with the furnace. The obtained zirconia ceramics are detected by XRD as a single tetragonal phase. At 800°C, in oxidizing atmosphere (air) and reducing atmosphere (Ar-H 2 Atmosphere) has good stability, the conductivity is 4.3×10 -2 S / cm.

Embodiment 2

[0019] Analytical pure ZrO 2 , Mn 2 o 3 and Ce 2 O according to Zr 0.75 mn 0.18 Ce 0.07 o 2 The stoichiometric ratio is weighed, the weighed mixed powder is poured into the mortar, fully mixed and ground, and then the powder is pressed under a pressure of 10MPa by dry pressing molding For a 30mm×5mm green sheet, put the green sheet into a high-temperature tube furnace at a heating rate of 300°C / h, keep it at 1300°C for 18h in an Ar gas atmosphere, and then cool it with the furnace. The obtained zirconia ceramics are detected by XRD as a single tetragonal phase. Conductivity at 1000°C is 6.5×10 -2 S / cm.

Embodiment 3

[0021] Analytical pure ZrO 2 , Mn 2 o 3 and Gd 2 o 3 According to Zr 0.75 mn 0.19 Gd 0.06 o 2Weigh the stoichiometric ratio, pour the weighed mixed powder into the mortar, mix and grind fully, and then use the dry pressing molding process to press the powder into a 50mm×5mm×2mm under a pressure of 8MPa For the green sheet, put the green sheet into a high-temperature tube furnace at a heating rate of 300°C / h, keep it at 1350°C for 12h under an Ar gas atmosphere, and then cool it with the furnace. The obtained zirconia ceramics are detected by XRD as a single tetragonal phase. At 1000°C in a reducing atmosphere (Ar-H 2 Atmosphere) has good stability, the conductivity is 6.2×10 -2 S / cm.

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Abstract

The invention discloses a zirconia ceramic stabilized by rare earth oxide and manganese oxide and a method for preparing the same. The zirconia ceramic consists of a certain mol percent of zirconia, the rare earth oxide and the manganese oxide, wherein the zirconia is a matrix, and the rare earth oxide and transition metal oxide of manganese oxide serve as a stabilizing agent together. The preparation process comprises the following steps: pouring the weighed and mixed powder of the zirconia, the manganese oxide and the rare earth oxide into a mortar; after fully mixing and grinding the mixed powder, pressing the mixed powder into blank tablets at a pressure of between 8 and 10 MPa; sintering the blank tablets in a high-temperature tubular furnace; and then cooling the blank tablets with the furnace. The invention adopts the transition metal oxide and the rare earth oxide as a stabilizing agent together to prepare the stabilized zirconia, has the characteristics of simple operation method, accuracy, high efficiency, easy control of reaction conditions, full reaction and the like, and the prepared square zirconia ceramic material stabilized by the manganese oxide has good stability and conductivity.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a single tetragonal zirconia ceramic material and a preparation method thereof, in particular to a zirconia ceramic co-stabilized by rare earth oxides and manganese oxide and a preparation method thereof. Background technique [0002] Zirconia (ZrO 2 ) is a very important class of structural and functional materials with high melting point and good chemical stability. Pure zirconia will undergo a monoclinic crystal system (m-ZrO 2 ), tetragonal system (t-ZrO 2 ) and cubic system (c-ZrO 2 ) transformation. Pure ZrO 2 During the sintering cooling process, the martensitic phase transformation from tetragonal phase to monoclinic phase will be accompanied by a volume change of 3% to 5%. This volume effect will cause material cracking, which limits the engineering application of zirconia materials. [0003] In order to eliminate the volume effect caused by the phase transition, r...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/622
Inventor 冯建情卢亚锋李成山闫果白利锋熊晓梅
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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