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含量逐渐增加;在恒压120V时,硫酸溶液浓度为0.3mol/L即出现锐钛相和金红石相TiO_2,随着硫酸浓度的提高金红石相TiO_2的含量先增加后减少. 关键词:TC4钛合金; 阳极氧化; TiO_2多孔膜; 金红石型; 锐钛型; TC4 titanium alloy; anodic oxidation; TiO_2 porous film; rutile type; anatase type......
Influence of rutile (TiO2) content on wear and microhardness characteristics of aluminium-based hybrid composites synthesized by powder metallurgy C. ANTONY VASANTHA KUMAR1, J. SELWIN RAJADURAI2 1... of composites. The observation concludes that delamination and adhesive wear are the predominant mechanisms. Key words: aluminium; metal-matrix composite; rutile; powder metallurgy; sliding wear 1......
生产的理想原料. 关键词:钛铁矿;氧化预处理;流态化浸出;人造金红石;沸腾氯化 中图分类号:TF111 文献标志码:A Producing process of high quality synthetic rutile for fluidizing chlorination XIONG Xue-liang, YANG Zhi... by fluidization leaching. The second is obtained by pressure leaching, and the minimum is obtained by agitation leaching. A new rutile phase appears on the surface of mineral by oxidation treating......
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="ChDivSummary">Nb-doped TiO2 nanoparticles were prepared by hydrothermal treatment of titanate nanotubes in niobium oxalate aqueous solution.The effect of Nb doping and rutile content on the photoelectrochemical performance based on TiO2 powder electrodes was investigated.The results show that Nb-doped TiO2 with a small amount of rutile exhibits the enhanced photoelectric conversion efficiency for dye......
properties on the surface of Ti O2 nanoparticles under photoexcitation. A remarkable improvement of photocatalytic activity of shapecontrolled brookite and rutile Ti O2 nanorods with modification of Fe3compounds was observed under visible light.Crystal face-selective metal compound modification on exposed crystal faces of Ti O2 nanorods with brookite and rutile phases was successfully prepared......
, Tohoku University3. Fanuc Co., Ltd.4. Graduate School of Environmental Studies, Tohoku University摘 要:Rutile(TiO2) is heavily used in pigments and colorants, and the most abundant source of rutile is ilmenite. Upon oxidation of ilmenite, rutile can be formed with modest energy consumption; furthermore, after leaching, only a few byproducts are formed......
Ce掺杂对TiO_2晶型转变的影响 孙洪军1,张建权1,杨冬1,朱振峰1,李军奇1,郭丽英1 (1.陕西科技大学,材料科学与工程学院,陕西,西安,710021;2.陕西科技大学,教育部轻化工助剂化学与技术重点实验室,陕西,西安,710021) 摘要:以钛酸四丁酯以及六水合硝酸铈为原料,采用溶胶-凝胶法制备了纯的和Ce掺杂的TiO_2粉体,研究了不同掺杂量对TiO_2晶形转变产生的影响.结果表明,Ce离子的掺杂阻碍了TiO_2粒子由锐钛矿型向金红石型的转变,拓宽了锐钛矿型TiO_2的使用温度范围;TiO_2晶粒的尺寸的变化是随着焙烧温度的升高逐渐长大,随掺杂量的增加逐渐减小.TiO_2粉体粒子在锐钛矿型状态下,颗粒分散较为均匀,并且无明显团聚现象. 关键词:掺杂; 锐钛矿; 金红石; 晶型转变; 晶粒尺寸; doped; anatase; rutile; crystal......
量子尺寸氧化钛纳米晶的制备及其光谱研究 高濂1,郭景坤1,张青红2 (1.中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室,上海200050;2.中国科学院上海硅酸盐研究所高性能陶瓷和超微结构?国家重点实验室,上海200050) 摘要:以TiCl4为原料,制备了金红石相透明的氧化钛胶体(d=3nm)和粉体(d=6.8nm).用紫外-可见光谱,反射光谱和导数吸收谱研究了金红石相氧化钛纳米晶的量子尺寸效应.实验观测到的量子尺寸效应比锐钛矿相氧化钛显著,也大于有效质量近似和紧束缚近似的预测值. 关键词:金红石; 胶体; 量子尺寸效应; rutile; colloid; quantum-size effect; [全文内容正在添加中] ......
四氯化钛水解法制备二氧化钛纳米晶的影响因素 高濂1,郭景坤1,张青红1 (1.中科院上海硅酸盐研究所高性能陶瓷和超微结构国家重点试验室,上海 200050) 摘要:研究了四氯化钛水解法制备的二氧化钛纳米晶工艺中水解温度和硫酸根离子对粉体性能的影响.室温下的水解产物为无定形结构,这种粉体有着很大的比表面积,其孔为介孔尺度;添加少量的硫酸根离子使粉体的孔径在2~5nm,最可几孔径为3.8nm.提高水解温度能得到金红石与锐钛矿相的混晶,同样的水解温度下,添加少量的硫酸根离子则为纯锐钛矿相.用 XRD,TEM,DRS和BET等方法对粉体的性能进行了表征,混晶紫外 -可见漫反射光谱不同于两种纳米晶机械混合物. 关键词:纳米晶; 二氧化钛; 锐钛矿; 金红石; 四氯化钛水解; nanocrystalline; titania; anatase; rutile; TiC l4......