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以微米或纳米氧化锆粉体为主原料,钒锆蓝色料或Co3O4为着色剂,添加适量烧结助剂制备蓝色氧化锆陶瓷。研究了氧化锆、助剂、着色剂等对蓝色氧化锆陶瓷颜色及性能的影响。结果表明:用纳米级ZrO2粉体为原料,钒锆蓝色料为着色剂,添加少量烧结助剂,可制得性能优良、颜色亮丽的蓝色氧化锆陶瓷;用纳米级ZrO2为原料,Co3O4为着色剂,添加少量烧结助剂,可制得性能优良、颜色亮丽的钴蓝色氧化锆陶瓷。 相似文献
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PREPARATION OF ZrO_(2(n)) - A1_2O_3 CERAMIC NANOCOMPOSITE BY MIXING SOL WITH AQUEOUS SUSPENSIONS 下载免费PDF全文
采用微波加热水解氧氯化锆及醇水混合液体,制得ZrO_2前驱物——纳米水合氧化锆溶胶。讨论了反应液体中氧氯化锆浓度和醇/水比对生成物平均粒度及其分布的影响;得出了采用聚甲基丙烯酸铵作为电空间稳定剂的亚微米级氧化铝水悬浮液的稳定条件;阐述了溶胶-悬浮液混合制备复合陶瓷的工艺过程。 相似文献
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采用浸渍法制备了固体碱催化剂硅酸钠/二氧化锆(Na2SiO3/ZrO2),并用其催化大豆油制备生物柴油。考察了催化剂焙烧温度、催化剂焙烧时间、硅与锆物质的量比、醇油物质的量比和催化剂用量等因素对生物柴油产率的影响。X射线衍射(XRD)表征结果显示,引入硅酸钠可调变催化剂中二氧化锆的晶相组成。对催化剂的性能测试表明,当催化剂焙烧温度为600 ℃、催化剂焙烧时间为3 h、硅与锆物质的量比为4、醇油物质的量比为7、催化剂用量(催化剂占大豆油的质量)为3%时,生物柴油的产率最高为92.5%。 相似文献
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本文以电熔MgO稳定氧化锆(1.5μm)、电熔单斜锆(3~7μm)、共沉淀法制备的单斜锆聚晶(10μm聚晶)为主要原料.通过用电熔镁稳定氧化锆细粉制备出粒径在120目以下的聚晶作为骨料,以电熔单斜锆(3~7μm)作为细粉,可以制备出高强度、高致密度、热震性能较好的氧化锆试样. 相似文献
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新型Cu/ZrO2环己醇脱氢催化剂的制备 总被引:4,自引:0,他引:4
以硝酸铜、氧氯化锆为原料,配制成n(Zr)∶n(Cu)=(1~4)∶1的溶液,以w(NaOH)=15%溶液为沉淀剂,采用共沉淀法,制备出新型Cu/ZrO2环己醇脱氢催化剂。通过正交试验选择出较优的催化剂制备条件为:n(Zr):n(Cu)=2∶1,锆盐初始浓度0.2 mol·L-1,焙烧时间5 h,焙烧温度400 ℃,滴定终点pH值为12。考察了催化剂预处理、反应温度等对脱氢过程产物收率和选择性的影响。在优化条件下制得的催化剂用于环己醇脱氢时,环己酮产品收率达85%,选择性近100%。 相似文献
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A series of mesoporous silicas impregnated with nanocrystalline sulphated zirconia was prepared by a sol-gel process using
an ionic liquid-templated route. The physicochemical properties of the mesoporous sulphated zirconia materials were studied
using characterisation techniques such as inductively coupled optical emission spectroscopy, X-ray diffraction, transmission
electron microscopy, energy-dispersive X-ray microanalysis, elemental analysis and X-ray photoelectron spectroscopy. Analysis
of the new silicas indicates isomorphous substitution of silicon with zirconium and reveals the presence of extremely small
(< 10 nm) polydispersed zirconia nanoparticles in the materials with zirconium loadings from 27.77 to 41.4 wt.%. 相似文献
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Weixing Li Yingxiang Ni Weiwei Liu Weihong Xing Nanping Xu 《Korean Journal of Chemical Engineering》2013,30(6):1222-1228
Sulfated zirconia catalysts are proposed for the reversible hydrolysis of ethyl lactate instead of liquid acids. Sulfated zirconia catalysts were prepared by precipitation-impregnation method. The zirconium hydroxide was produced from zirconium oxychloride by adding aqueous ammonia and then impregnated in sulfuric acid. The solid samples were obtained by filtration and evaporation of the mixtures, respectively. After the samples were calcined, the sulfated zirconia catalysts were prepared. The results showed that the catalyst prepared by evaporation has higher catalytic activity. The physicochemical characteristics of the sulfated zirconia catalysts were studied by thermal analysis, X-ray powder diffraction (XRD), temperature programmed desorption of ammonia (NH3-TPD) and N2 adsorption-desorption, respectively. By the precipitation-impregnation-evaporation method, the optimal sulfated zirconia catalyst of tetragonal phase was prepared under liquid-solid ratio of 5ml/g, 1 mol/L of H2SO4 and calcination at 650 °C for 3 h. The conversion of the ethyl lactate was 87.8% in 3 h at 85 °C with the catalyst loading 2 wt% and initial molar ratio of water to ethyl lactate 20: 1. 相似文献
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Lavinia Macarie Nicoleta Plesu Smaranda Iliescu Adriana Popa Gheorghe Ilia 《应用聚合物科学杂志》2011,119(3):1820-1826
UV‐cured nanocomposite films were prepared from acrylic monomer and two types of nanomaterial: zirconium vinylphosphonate and zirconia, in the presence of a photoinitiator. The films were characterized by FTIR, SEM, and AFM. FTIR spectra showed the disappearance of band assigned to the CC group both of monomer and zirconium vinylphosphonate by polymerization and the presence of the phosphonate group in polymer. The influence of zirconium vinylphosphonate and zirconia content on thermooxidative degradation of polymeric films was studied by thermogravimetry. SEM and AFM images showed that nanomaterials are dispersed in polymer matrix with no macroscopic phase separation. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
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综述了用化学镀膜工艺制备的Zr-0l、Zr-02型活性锆白颜料是一种用途极其广泛的氧化锆型颜料,又称活性锆白粉.活性锆白颜料的制备,使粉体具有多种功能:耐候性、耐蚀性、悬浮性、疏水性,在卷钢涂料和汽车涂料上已成功应用.并指出今后方向和发展趋势. 相似文献
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Thermally stable zirconia with a large BET surface area was prepared by using zirconium atrane derivatives and commercial alkyltrimethylammonium bromide. The zirconia samples were characterized by wide-angle X-ray diffraction, thermal analysis and N2 adsorption/desorption analysis. The results showed that the present zirconia existed as a thermally stable tetragonal crystallite and consisted of mesoporous material with microporous contribution. The BET surface area was found larger than 240 m2/g even after calcination at 600 °C. The present zirconia after sulfation was applied to the skeletal isomerization of 1-butene, and its catalytic activity was found superior to that of the conventional sulfated zirconia. 相似文献
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Etsuro Kato Masanori Hirano Yuichi Kobayashi Keisuke Asoh Makoto Mori Masato Nakata 《Journal of the American Ceramic Society》1996,79(4):972-976
Monodisperse zirconia particles were prepared by the thermal hydrolysis of mixtures of zirconyl chloride, zirconium hydroxide, and water at high concentrations corresponding to about 5 mol/L Zr. The particles, as first prepared, were temporarily agglomerated spheres composed of primary ultrafine zirconia crystals. The agglomerated particles collapsed and dispersed in water to form a translucent sol. When vacuum dried and followed by heat treatment, they were not dispersible. The size of the agglomerated particles increased with increasing molar ratio of the zirconium chloride in the starting mixture, varying from about 0.2 to 0.6 μm. Using the sample thus obtained, monodisperse tetragonal zirconia particles of about 0.35 μm containing 3 mol% Y2 O3 with a relatively uniform composition were obtained by homogeneous precipitation of YOHCO3 by heating with urea and calcination at 800°C. 相似文献
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Nanocrystalline zirconia powders with high surface area, mesoporous structure and tetragonal crystallite phase have been prepared
by the surfactant-assisted route by using of Pluronic P123 block copolymer surfactant. The effect of several process parameters
such as the type of zirconium precursor, pH value, refluxing time, refluxing temperature and surfactant to zirconium molar
ratio on the structural properties of the powders have been investigated. 相似文献