Low-temperature liquid-phase sintered La2Zr2O7 ceramics and sintering method thereof

A technology of low temperature liquid phase and sintering method is applied in the low temperature liquid phase sintering and sintering of La2Zr2O7 ceramics, and the binary sintering aid CuO-TiO2 realizes the low temperature sintering field of La2Zr2O7, which can solve the problems that have not yet been seen, and achieves the advantages of being beneficial to industrial production, The effect of fine grain size and lower sintering temperature

Active Publication Date: 2012-06-20
江苏兴云新能源有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

So far, no information about La 2 Zr 2 o 7 Literature or patent reports on low-temperature sintering of ceramics

Method used

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  • Low-temperature liquid-phase sintered La2Zr2O7 ceramics and sintering method thereof
  • Low-temperature liquid-phase sintered La2Zr2O7 ceramics and sintering method thereof
  • Low-temperature liquid-phase sintered La2Zr2O7 ceramics and sintering method thereof

Examples

Experimental program
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Embodiment 1

[0033] Press La 2 Zr 2 o 7 +0.5wt% (CuO-16.7wt%TiO 2 ) Ratio weighing raw material La 2 Zr 2 o 7 with CuO-16.7wt%TiO 2 : Weigh La 2 Zr 2 o 7 49.75g, CuO 0.2083g, TiO 2 0.0417g. Put the powder in a zirconia ball mill jar, add absolute ethanol as a ball milling medium according to 1.5 times the total weight of the mixture, add zirconia balls at a ball-to-material ratio of 4:1, and ball mill on a planetary ball mill for 12 hours to obtain a slurry. The mixed slurry was dried at 80°C for 20 hours, and passed through a 100-mesh standard sieve to obtain a mixture; 1wt.% polyvinyl alcohol was added to the mixture as a binder, and then pressed into small discs at 35MPa, and the small The wafer was heated to 300°C at a rate of 5°C / min in a high-temperature atmospheric pressure oxidation furnace, and kept at a temperature of 0.5h for degumming treatment. After degumming, the sample was heated up to 1100°C at a rate of 5°C / min for pressureless sintering for 5 hours, and after...

Embodiment 2

[0035] Press La 2 Zr 2 o 7 +1.5wt% (CuO-16.7wt%TiO 2 ) Ratio weighing raw material La 2 Zr 2 o 7 with CuO-16.7wt%TiO 2 : Weigh La 2 Zr 2 o 7 49.25g, CuO 0.625g, TiO 2 0.125g. Put the powder in a zirconia ball mill jar, add absolute ethanol as a ball milling medium according to 1.5 times the total weight of the mixture, add zirconia balls at a ball-to-material ratio of 5:1, and ball mill on a planetary ball mill for 18 hours to obtain a slurry. The mixed slurry was dried at 80°C for 20 hours, and the mixture was obtained after passing through a 100-mesh standard sieve; 2wt.% polyvinyl alcohol was added to the mixture as a binder, and then pressed into small discs at 35MPa. The wafer was heated to 350°C at a rate of 3°C / min in a high-temperature atmospheric pressure oxidation furnace, and held for 1 hour to perform degumming treatment. After degumming, the sample was raised to 1250°C at a heating rate of 3°C / min for pressureless sintering for 4 hours, and after cooli...

Embodiment 3

[0037] Press La 2 Zr 2 o 7 +3.0wt% (CuO-16.7wt%TiO 2 ) Ratio weighing raw material La 2 Zr 2 o 7 with CuO-16.7wt%TiO 2 : Weigh La 2 Zr 2 o 7 48.5g, CuO 0.1.25g, TiO 2 0.25g. Put the powder in a zirconia ball mill jar, add absolute ethanol as a ball milling medium according to 1.5 times the total weight of the mixture, add zirconia balls at a ball-to-material ratio of 6:1, and ball mill on a planetary ball mill for 24 hours to obtain a slurry. The mixed slurry was dried at 80°C for 20 hours, and passed through a 100-mesh standard sieve to obtain a mixture; 3wt.% polyvinyl alcohol was added to the mixture as a binder, and then pressed into small discs at 35MPa, and the small The wafer was heated to 400°C at a rate of 8°C / min in a high-temperature atmospheric pressure oxidation furnace, and kept for 1.5h for degumming treatment. After degumming, the sample was sintered without pressure at a heating rate of 8 °C / min to 1400 °C for 5 h, and after cooling in the furnace,...

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Abstract

The invention relates to low-temperature liquid-phase sintered La2Zr2O7 ceramics comprising 97 to 99.5 percent of La2Zr2O7 and 0.5 to 3 percent of CuO-TiO2 by percent weight. A preparation method of the low-temperature liquid-phase sintered La2Zr2O7 ceramics comprises three steps of proportioning/mixing, pressing and sintering. According to the low-temperature liquid-phase sintered La2Zr2O7 ceramics and the preparation method of the low-temperature liquid-phase sintered La2Zr2O7 ceramics, La2Zr2O7 ceramics is obtained by using common normal-pressure sintering through introducing a binary sintering adjuvant of the CuO-TiO2 into the La2Zr2O7; a liquid phase is formed at low temperature by utilizing the CuO-TiO2 through regulating the content of the CuO-TiO2 and controlling a sintering process, so that an La2Zr2O7 sintering mechanism is converted from solid-phase sintering to liquid-phase sintering; therefore, the sintering temperature is greatly lowered; and a compact La2Zr2O7 ceramic block body is obtained at about 1100 DEG C, the prepared ceramics has smaller crystal grains, the mechanical property is good, and the energy consumption is low. According to the low-temperature liquid-phase sintered La2Zr2O7 ceramics and the preparation method of the low-temperature liquid-phase sintered La2Zr2O7 ceramics, the components are reasonable, the preparation process is simple, the sintering temperature is low, and the La2Zr2O7 crystal grains prepared by sintering are fine and compact; and the preparation of a ceramic material of an La2Zr2O7 thermal barrier coating or an La2Zr2O7 block body at low temperature can be realized. The low-temperature liquid-phase sintered La2Zr2O7 ceramics and the preparation method of the low-temperature liquid-phase sintered La2Zr2O7 ceramics are suitable for industrialized application.

Description

Technical field: [0001] What the present invention relates to is a kind of low temperature liquid phase sintering La 2 Zr 2 o 7 Ceramics and sintering methods, specifically referring to the addition of different contents of binary sintering aids CuO-TiO 2 Realize La 2 Zr 2 o 7 low temperature sintering. The invention belongs to the technical field of preparation of structural ceramic materials. Background technique: [0002] Thermal barrier coating is a thermal protective coating consisting of a ceramic thermal insulation surface layer and an anti-oxidation bonding primer. For the traditional ceramic heat insulation surface material 8YSZ (8wt.%Y 2 o 3 -ZrO 2 ) The problem of poor thermal stability at high temperature, people have developed a series of zirconia stabilized by different stabilizers, and the research shows that compared with 8YSZ, the comprehensive performance of these materials has not been significantly improved. In recent years, zirconate ceramics ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/50C04B35/63
Inventor 周宏明李荐刘芙蓉李艳芬朱玉华谭笛
Owner 江苏兴云新能源有限公司
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