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氧化锆纳米粉体烧结性能研究 被引量:9
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作者 韩敏芳 彭苏萍 +2 位作者 杨翠柏 刘泽 王军伟 《材料科学与工艺》 EI CAS CSCD 2004年第1期29-32,共4页
为了研究纳米氧化锆粉体的烧结性能,以4种不同粒度的氧化锆粉体为原料,在热分析仪上测试了室温~1000℃范围内坯体的形变量和热膨胀性能.采用1450℃恒温1~6h的烧结工艺,制备了氧化锆陶瓷,并进行了性能表征.结果表明:粉料1次粒子粒径越... 为了研究纳米氧化锆粉体的烧结性能,以4种不同粒度的氧化锆粉体为原料,在热分析仪上测试了室温~1000℃范围内坯体的形变量和热膨胀性能.采用1450℃恒温1~6h的烧结工艺,制备了氧化锆陶瓷,并进行了性能表征.结果表明:粉料1次粒子粒径越小,其初始烧结温度越低;粉料的团聚粒径越小,分布越窄,坯体的烧结致密化越容易. 展开更多
关键词 氧化锆纳米粉 烧结性能 粒度 热膨胀性能 致密化
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共沉淀—超临界流体干燥法制备ZrO_2(Y_2O_3)纳米粉 被引量:1
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作者 张海礁 杨觉明 +2 位作者 陈平 许岗 刘秀兰 《西安工业学院学报》 2004年第3期276-279,共4页
采用共沉淀—超临界流体干燥法制备出ZrO2 (Y2 O3 )纳米粉 .研究了位阻剂、超临界流体干燥处理工艺和晶化温度对粉末性能的影响 .研究结果表明 :用该法制备的粉末可以有效地防止干燥过程中粒子间的团聚 .选择聚乙二醇 (PEG)作为位阻剂 ... 采用共沉淀—超临界流体干燥法制备出ZrO2 (Y2 O3 )纳米粉 .研究了位阻剂、超临界流体干燥处理工艺和晶化温度对粉末性能的影响 .研究结果表明 :用该法制备的粉末可以有效地防止干燥过程中粒子间的团聚 .选择聚乙二醇 (PEG)作为位阻剂 ,采用 2 6 0℃× 7.5MPa的超临界流体干燥处理和 6 5 0℃× 1 .5h的晶化处理制度 ,可以得到颗粒团聚程度小、近球形、平均粒度小于 4 0nm的以四方相为主的ZrO2 (Y2 O3 ) 展开更多
关键词 共沉淀 超临界流体干燥 氧化锆纳米粉 团聚
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低温水热法制备纳米氧化锆粉体 被引量:5
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作者 吴昊 史春燕 +3 位作者 付晓辉 赵婉瑜 范冰冰 张锐 《硅酸盐通报》 CAS CSCD 北大核心 2015年第11期3247-3250,共4页
本文以Zr OCl_2为原料、NH_3·H_2O为沉淀剂、Ca Cl_2为稳定剂,采用交叉喷淋法制备氧化锆前驱体,通过改变反应釜内前驱体浓度、矿化剂Na OH的加入及矿化剂Na OH浓度,采用低温水热法制备纳米氧化锆粉体。结果表明:反应釜内前驱体浓... 本文以Zr OCl_2为原料、NH_3·H_2O为沉淀剂、Ca Cl_2为稳定剂,采用交叉喷淋法制备氧化锆前驱体,通过改变反应釜内前驱体浓度、矿化剂Na OH的加入及矿化剂Na OH浓度,采用低温水热法制备纳米氧化锆粉体。结果表明:反应釜内前驱体浓度降低有利于提高粉体的结晶度,矿化剂Na OH的加入可有效降低水热反应温度。当反应温度为110℃、保温时间2 h、反应釜内前驱体的浓度为0.25 mol/L、矿化剂Na OH浓度为1 mol/L时,可制备平均粒径为26 nm的四方相氧化锆粉体。 展开更多
关键词 低温水热法 氧化锆纳米粉 矿化剂
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Preparation of alumina-doped yttria-stabilized zirconia nanopowders by microwave-assisted peroxyl-complex coprecipitation
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作者 齐亮 徐明霞 +1 位作者 田玉明 赵今伟 《中国有色金属学会会刊:英文版》 CSCD 2006年第B01期426-430,共5页
Alumina-doped yttria-stabilized zirconia (ADYSZ) nanopowders were prepared by microwave-assisted peroxyl-complex coprecipitation (MAPCC) using ZrOCl2·8H2O, Y2O3 and AlCl3·6H2O as starting materials, NH3·... Alumina-doped yttria-stabilized zirconia (ADYSZ) nanopowders were prepared by microwave-assisted peroxyl-complex coprecipitation (MAPCC) using ZrOCl2·8H2O, Y2O3 and AlCl3·6H2O as starting materials, NH3·H2O as precipitant and H2O2 as complexant. The effects of adding H2O2 and microwave drying on the preparation and properties of ADYSZ were investigated. The precursors and nanopowders were studied by EDX, XRD, SEM and TEM techniques. The results show that the uniformity of component distribution within ADYSZ nanopowders is improved by adding appropriate dosage of H2O2. Complexing reaction between H2O2 and Zr4+ ion restrains the hydrolyzation and precipitation of Zr4+ ion. With the addition of H2O2, Al3+, Y3+ and Zr4+ ions can be precipitated synchronously in a relatively narrow range of pH value. H2O2 also improves the filterability of the wet precipitate. The highly hydrophilic precipitates can be quickly and effectively separated from aqueous solution. During microwave drying process, the moisture of wet precursors is selectively heated. Quick expansion of steam vapor within the wet colloidal particles causes the aggregations burst into numerous tiny lumps. Compared with oven drying, microwave drying can not only shorten drying time but also reduce aggregation intensity of the resultant ADYSZ nanopowders. 展开更多
关键词 铝掺杂 氧化钇稳定化氧化锆纳米粉 共沉淀 氧化 微波干燥
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Influence of heat treatment on nanocrystalline zirconia powder and plasma-sprayed thermal barrier coatings 被引量:2
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作者 蒋显亮 刘纯波 +1 位作者 刘敏 朱晖朝 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第12期2272-2280,共9页
Nanostructured zirconia top coat was deposited by air plasma spray and NiCoCrAlTaY bond coat was deposited on Ni substrate by low pressure plasma spray.Nanostructured and conventional thermal barrier coatings were hea... Nanostructured zirconia top coat was deposited by air plasma spray and NiCoCrAlTaY bond coat was deposited on Ni substrate by low pressure plasma spray.Nanostructured and conventional thermal barrier coatings were heat-treated at temperature varying from 1050 to 1 250oC for 2-20 h.The results show that obvious grain growth was found in both nanostructured and conventional thermal barrier coatings(TBCs)after high temperature heat treatment.Monoclinic/tetragonal phases were transformed into cubic phase in the agglomerated nano-powder after calcination.The cubic phase content increased with increasing calcination temperature.Calcination of the powder made the yttria distributed on the surface of the nanocrystalline particles dissolve in zirconia when grains grew.Different from the phase constituent of the as-sprayed conventional TBC which consisted of diffusionlesstransformed tetragonal,the as-sprayed nanostructured TBC consisted of cubic phase. 展开更多
关键词 nanocrystalline material ZIRCONIA thermal barrier coating heat treatment phase composition
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Preparation and characterization of monodisperse zirconia spherical nanometer powder via lamellar liquid crystal template method
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作者 何伟艳 刘进荣 +2 位作者 曹珍珠 李彩虹 高艳芳 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第10期1721-1727,共7页
Cubic phase spherical zirconia nano-powder was prepared by a direct template route in the lamellar liquid crystal formed by polyoxyethylene tert-octylphenyl ether(Triton X-100)/sodium dodecyl sulfate(SDS)/H_2O.The pre... Cubic phase spherical zirconia nano-powder was prepared by a direct template route in the lamellar liquid crystal formed by polyoxyethylene tert-octylphenyl ether(Triton X-100)/sodium dodecyl sulfate(SDS)/H_2O.The precursor powder and zirconia powder were characterized by XRD,FT-IR,TG/DSC,TEM,and SEM methods.Results show that the stability of the lamellar liquid crystal is controlled by NH_3·H_2O concentration.The size of nanoparticles is greatly affected by NH_3·H_2O and ZrOCl_2·8H_2O concentrations.The zirconia nanoparticles show narrow particle size distribution of 10-30 nm. 展开更多
关键词 ZIRCONIA Spherical nanometer powder Lamellar liquid crystal template
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