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Method for notably improving low-temperature conductivity of Y2O3 stable ZrO2 ceramic material

A ceramic material and conductivity technology, applied in the field of low-temperature conductivity, can solve the problems of reducing the total resistance of YSZ ceramic materials, reducing the thickness of the block, and limited resistivity, so as to achieve low cost and improve grain boundary conductivity and conductivity Improved effect

Inactive Publication Date: 2007-04-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, many scholars believe that reducing the resistivity of YSZ ceramic materials from the nature of the material is very limited, but by making thin films, reducing the thickness of the block and reducing the total resistance of YSZ ceramic materials

Method used

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  • Method for notably improving low-temperature conductivity of Y2O3 stable ZrO2 ceramic material
  • Method for notably improving low-temperature conductivity of Y2O3 stable ZrO2 ceramic material

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Embodiment 1

[0015] A significantly higher Y 2 o 3 Stabilized ZrO 2 A method for low-temperature electrical conductivity in a ceramic material, comprising the steps of:

[0016] 1. Preparation of YSZ nanopowder:

[0017] With high purity ZrOCl 2 .8H 2 O and Y (NO 3 ) as raw material, according to 92mol% ZrO 2 than 8mol% Y 2 o 3 Mix to prepare a mixed solution; drop ammonia water with a molar ratio (1:1) into the continuously stirred mixed solution, control the temperature of the mixed solution to 60°C, and the pH value to 9.5; after the reaction is completed, filter and use deionized water The precipitate was washed repeatedly to remove excess Cl - , NH 4 + Plasma; then wash the precipitate with alcohol to remove the water in the precipitate; bake the precipitate in a vacuum oven at 60°C for 15 hours to obtain the YSZ precursor; grind the precursor powder and calcinate it at 700°C for 2 hours to obtain YSZ nano powder. XRD analysis confirmed that the prepared nanopowder was cu...

Embodiment 2

[0038] A significantly higher Y 2 o 3 Stabilized ZrO 2 The method for low-temperature electrical conductivity in ceramic materials comprises the following steps: putting YSZ powder with a particle size of 10-20nm into a graphite mold with an inner diameter of 10mm, and sintering with pulse current sintering equipment (SPS-1050); The pressure is 25MPa, the heating rate is 70°C / min, the temperature is kept at 1150°C for 3 minutes, cooled with the furnace, and then annealed in the air at 1000°C for 2 hours to remove free carbon and obtain Y 2 o 3 Stabilized ZrO 2 Ceramic material, its conductivity at 300~500℃ is 1.013×10 -4 S / cm~5.065×10 -3 S / cm.

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Abstract

The invention discloses an improving method of low-temperature conductivity in the stable ZrO2 ceramic material of Y2O3, which is characterized by the following: placing YSZ powder with grain size at 10-20nm in the graphite mould with inner diameter at 10mm; sintering through pulse current equipment; setting the axial pressure at 25Mpa; heating at 70-100deg.c / min; insulating at 1150-1250 deg. for 3-5min; cooling; annealing under 1000 deg.c for 2h; removing free carbon to obtain the product with conductivity at 1.013*10-4S / cm-5.065*10-3S / cm under 300-500 deg.c.

Description

technical field [0001] The present invention relates to a method for improving Y 2 o 3 Stable Z r o 2 A method for low-temperature electrical conductivity in ceramic materials. Background technique [0002] Y 2 o 3 Stabilized ZrO 2 (referred to as YSZ) is an ion conductor, Y 2 o 3 Stable Z r o 2 Ceramic materials (referred to as YSZ ceramic materials) have important applications in high-temperature solid oxide fuel cells (SOFC), oxygen sensors, oxygen pumps and other fields. At 800-1000 °C, YSZ ceramic materials have been commercially applied. But people have been exploring the possibility of the application of medium and low temperature (300 ~ 700 ℃) YSZ ceramic materials, because the medium and low temperature show more attractive demand. For example, for oxygen sensors, the working temperature of proton membrane fuel cells for automobiles is lower than 150 °C, and the operating temperature of sensors that require control of oxygen concentration is also around ...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/64
Inventor 张东明雷小力张联盟
Owner WUHAN UNIV OF TECH
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