Preparation of stabilized zirconia powder by coprecipitation

碩士 === 淡江大學 === 化學工程學系 === 91 === Yttria Stabilized zirconia(YSZ) powder was prepared using a coprecipitation technique. Oxalate acid was added into an aqueous solution of Y3+ and Zr4+ nitrates to form the corresponding oxalate precursor. The pH of solution was adjusted and controlled by adding NH4O...

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Main Authors: Tsung-Ying, Tsai, 蔡宗螢
Other Authors: Hsuan-Fu Yu
Format: Others
Language:zh-TW
Published: 2003
Online Access:http://ndltd.ncl.edu.tw/handle/10231686823718058749
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spelling ndltd-TW-091TKU000630142015-10-13T13:35:33Z http://ndltd.ncl.edu.tw/handle/10231686823718058749 Preparation of stabilized zirconia powder by coprecipitation 以共沉澱法製備穩定化之氧化鋯粉體 Tsung-Ying, Tsai 蔡宗螢 碩士 淡江大學 化學工程學系 91 Yttria Stabilized zirconia(YSZ) powder was prepared using a coprecipitation technique. Oxalate acid was added into an aqueous solution of Y3+ and Zr4+ nitrates to form the corresponding oxalate precursor. The pH of solution was adjusted and controlled by adding NH4OH. The obtained oxalate precursors were calcined at different temperatures. The calcined powder was then characterized using TG/DSC, XRD, TEM and SEM. Effects of pH of the solution and contents of Y3+ in ZrO2 were studied. Thermal behavior of the oxalate precursor was strongly affected by the pH of solution. It indicated that alkaline conditions were preferred to form YSZ at lower calcination temperatures. Without adding Y3+, tetragonal ZrO2 powder was formed at 400 oC; however, calcination temperatures at 600 oC or above caused ZrO2 to convert from tetragonal structure to monoclinic structures. YSZ powder prepared using Zr4+:Y3+ = 1:0.06 at pH = 10 can preserve pure tetragonal molecular structure at temperatures as high as 800 oC. Hsuan-Fu Yu 余宣賦 2003 學位論文 ; thesis 110 zh-TW
collection NDLTD
language zh-TW
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sources NDLTD
description 碩士 === 淡江大學 === 化學工程學系 === 91 === Yttria Stabilized zirconia(YSZ) powder was prepared using a coprecipitation technique. Oxalate acid was added into an aqueous solution of Y3+ and Zr4+ nitrates to form the corresponding oxalate precursor. The pH of solution was adjusted and controlled by adding NH4OH. The obtained oxalate precursors were calcined at different temperatures. The calcined powder was then characterized using TG/DSC, XRD, TEM and SEM. Effects of pH of the solution and contents of Y3+ in ZrO2 were studied. Thermal behavior of the oxalate precursor was strongly affected by the pH of solution. It indicated that alkaline conditions were preferred to form YSZ at lower calcination temperatures. Without adding Y3+, tetragonal ZrO2 powder was formed at 400 oC; however, calcination temperatures at 600 oC or above caused ZrO2 to convert from tetragonal structure to monoclinic structures. YSZ powder prepared using Zr4+:Y3+ = 1:0.06 at pH = 10 can preserve pure tetragonal molecular structure at temperatures as high as 800 oC.
author2 Hsuan-Fu Yu
author_facet Hsuan-Fu Yu
Tsung-Ying, Tsai
蔡宗螢
author Tsung-Ying, Tsai
蔡宗螢
spellingShingle Tsung-Ying, Tsai
蔡宗螢
Preparation of stabilized zirconia powder by coprecipitation
author_sort Tsung-Ying, Tsai
title Preparation of stabilized zirconia powder by coprecipitation
title_short Preparation of stabilized zirconia powder by coprecipitation
title_full Preparation of stabilized zirconia powder by coprecipitation
title_fullStr Preparation of stabilized zirconia powder by coprecipitation
title_full_unstemmed Preparation of stabilized zirconia powder by coprecipitation
title_sort preparation of stabilized zirconia powder by coprecipitation
publishDate 2003
url http://ndltd.ncl.edu.tw/handle/10231686823718058749
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AT càizōngyíng yǐgòngchéndiànfǎzhìbèiwěndìnghuàzhīyǎnghuàgàofěntǐ
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