刘志
,
邓丽萍
,
宋岩
,
刘兴海
无机材料学报
doi:10.3724/SP.J.1077.2011.00134
液相反应条件下,以薄姆石溶胶为铝源, 室温离子液体1-甲基-3-丁基咪唑四氟硼酸盐([BMIM][BF4])存在下制备了晶态结构 中孔 γ-Al2O3. 采用N2物理吸附,X射线衍射, 透射电子显微镜,27Al魔角固体核磁共振对所制备的样品进行了结构表征.结果表明通过调节[BMIM][BF4]的用量,得到了孔道结构呈脚手架状、比表面积较大、平均孔径在12nm左右、孔容在1.0cm3/g以上,孔径分布较宽的介孔氧化铝; [BMIM][BF4]加入能够明显改善氧化铝的孔道结构.
关键词:
室温离子液体
,
mesoporous material
,
alumina
,
synthesis
周琦
,
邵忠宝
,
贺春林
,
邵忠财
,
才庆魁
,
高维娜
中国腐蚀与防护学报
研究了阴离子型表面活性剂(十二烷基苯磺酸钠、十二烷基硫酸钠)和阳离子型表面活性剂(三乙醇胺)对镍-磷-纳米氧化铝复合镀性能的影响.讨论了表面活性剂的种类、加入量对沉积速度、镀层的硬度和耐磨性能的影响.通过扫描电镜(SEM)观察各种复合镀层形貌，利用能谱仪(EDS)测量镀层中纳米Al2O3粒子的复合量.结果表明：纳米复合化学镀液中两种阴离子型表面活性剂的较佳加入量均为50 mg/L,阳离子型表面活性剂较佳加入量为100mg/L；采用阳离子表面活性剂时所得镀层的纳米粒子复合量较大，镀速快，耐磨性能好且纳米氧化铝分散较均匀；相比化学镀Ni-P和微米Al2O3复合化学镀Ni-P工艺所得镀层，纳米复合镀层具有较高的硬度和较好的耐磨性.
关键词:
复合镀
,
electroless plating
,
Ni-P
,
nanometer
,
alumina
闻立时
,
赵航炜
,
黄荣芳
材料研究学报
本文采用X 射线衍射、扫描电镜、分析电子显微镜和高分辩电镜,研究了热压复合SiC-A1_2O_3陶瓷的相组成、晶须、晶须-基体界面间的显微结构。结果表明,复合陶瓷中的晶须为15R 型SiC,基体为三方晶型的α-Al_2O_3。晶须内有大量的层错和孪晶;晶须-基体界面间存在一个过渡层,并有一定的取向关系。扫描电镜对样品断口的研究表明,存在晶须拔出和裂纹偏转两种增韧机制。
关键词:
碳化硅
,
alumina
,
whisker
,
microstructure
,
ceramic
材料科学技术（英文）
Changes of surface morphology following XeCl excimer laser irradiation were investigated for three engineering ceramic materials (Al2O3, Al2O3-SiC nanocomposite and Si3N4) Al2O3 and Al2O3-SiC nanocomposite samples exhibit a smooth rapid melt layer on the surface, and the formation of the metastable gamma-Al2O3 was observed. A silicon-rich layer on the surface was formed after laser irradiation of Si3N4. The toughness K-1c of the materials was measured by the indentation fracture method. After laser irradiation, the toughness of Al2O3, Al2O3-SiC nanocomposite and Si3N4 was improved to various degrees: Al2O3-SiC nanocomposite, 60% (max.); Al2O3, 40% (max.); Si3N4, 12% (max.).
关键词:
alumina
Liang LI
,
Naoto KOSHIZAKI
材料科学技术（英文）
This review summarizes the various techniques developed for fabricating nanotube arrays in porous anodic alumina membranes (AAMs). After a brief introduction to the fabrication process of AAMs, taking carbons, metals, semiconductors, organics, biomoleculars, and heterojunctions as typical examples, attention will be focused on the recently established methods to fabricate nanotubes in AAM, including electrochemical deposition, surface sol-gel, modified chemical vapor deposition, atomic layer deposition, and layer-by-layer growth. Every method is demonstrated by one or two reported results. Finally, this review is concluded with some perspectives on the research directions and focuses on the AAM-based nanotubes fields.
关键词:
Nanotube
,
Template
,
Anodic
,
alumina
,
membra
O.Kyrylov
,
R.Cremer
,
D.Neuschütz
金属学报(英文版)
In the last years a variety of plasma sources have been developed for film depositionby plasma activated deposition techniques. In addition to RF- and DC-sources, pulsedplasma sources are gaining increased attention. This interest is driven by the wish ofdepositing coatings with superior properties as compared to those deposited by conven-tional techniques. One prominent example of coatings that are significantly enhancedby the usage of pulsed plasmas is alumina. Although crystalline α-alumina can be de-posited by thermal CVD at temperatures above 1000℃ for two decades, no process forthe deposition of crystalline alumina on heat sensitive substrates like tempered steelsat low temperatures is commercially available up to now. In this paper, the depositionof alumina films from gaseous mixtures of AlCls-N2-H2-Ar in a bipolar pulsed glowdischarge at about 500℃ is reported. Special attention was paid on the correlation be-tween plasma characteristics and film properties. The measurements revealed that theproperties of the resulting coatings were significantly influenced by the characteristicsof the power supply. Depending on the gas composition and the plasma parameters,alumina films with high hardness and good adhesion were deposited.
关键词:
alumina
,
null
,
null
,
null
LIU Miaoxiu CHENG Zhaonian CHEN Nianyi Shanghai Institute of Metallurgy
,
Academia Sinica
,
Shanghai
,
ChinaKE Jiajun Institute of Chemical Metallurgy
,
Academia Sinica
,
Beijing
,
China CHEN Nianyi
,
Professor
,
Shanghai Institute of Metallurgy
,
Academia Sinica
,
Shanghai 200050
,
China
金属学报(英文版)
The regularity of the carbonization process in alumina production has been summarized by the pattern recognition and regression.A mathematical model has been proposed to describe the factors affecting the silica content of aluminium hydroxide product.The high concentration of aluminate ions in solution will produce aluminium hydroxide with low content of SiO_2 under the condition of Al_2O_3/SiO_2 ratio kept unchanged.This was confirmed by certain scale experiments.
关键词:
carbonization
,
null
,
null
,
null
