材料期刊网

Tape Casting of Al_2O_3-TiB_2/Al_2O_3-Nano-TiC Multilayer Composites

Yuping ZENG , Dongliang JIANG , Shouhong TAN and Jingkun GUO(Shanghai Institute of Ceramics , Chinese Academy of Sciences , Shanghai 200050 , China)

材料科学技术（英文）

Ceramic tapes, containing Al2O3-25 wt pct TiB2(B) and Al2O3-25 wt pct nano-TiC (c), have been obtained by tape casting process. Numerous tapes (about 60～80 tapes) were prepared by stacking in turn the composition (B) and (C), laminating under 10 MPa pressure, eliminating the solvent and burning out the polymer additives. The final green bodies were hot pressed at 1750℃ and 30 MPa. The composite has a bending strength of 568 MPa and a fracture toughness of 5.8 M Pa·m1/2. SEM analysis exhibits that Al2O3 particle growth was inhibited by TiC particles in C. but TiB2 particles could not hinder Al2O3 growth in B. The curves of GTA indicates that all organic additives could be removed completely above 600℃

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关于多相材料的研究

材料导报

多相材料是材料研究发展的必然结果。提出多相材料的研究，目的是要拓宽材料研究的视野，主张模糊各类材料的界限，运用纳米材料制备技术，博采各类材料制备工艺之所长，以使用上的要求为材料研究的准则，制作出低成本和高性能稳定性的材料。还强调在考虑材料研究中的问题时，始终以满足使用要求为目标，并不一味地追求材料的高性能，务求创新。提倡用逆向思维来考虑多相材料的研完，研究对象则针对于信息、能源、生物和环保领域的应用。多相材料材料研究About the Research of Multi-phase MaterialsGuo Jingkun (Shanghai Institute of Ceramics,Chinese Academy of Sciences ,Shanghai 200050, China)

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立方 TaN纳米粉的制备

类伟巍 , 沈龙海 , 刘丹 , 李雪飞 , 彭刚 , 崔启良 , 邹广田

无机材料学报 doi:10.3724/SP.J.1077.2007.00400

采用直流电弧法使金属钽和氮气直接反应制备出了TaN纳米粉．利用XRD、XPS、TEM等测试方法对所制备的TaN纳米粉进行了表征．结果表明: 所制备的纳米粉为单一的立方相TaN, 纳米颗粒的平均粒度为5~10nm．实验中还发现氮气的气压对制备纯立方相TaN具有关键性作用, 并讨论了立方相TaN的形成机理．

关键词: 立方相TaN , nanocrystallites , dc arc discharge method

立方TaN纳米粉的制备

类伟巍 , 沈龙海 , 刘丹 , 李雪飞 , 彭刚 , 崔启良 , 邹广田

无机材料学报 doi:10.3321/j.issn:1000-324X.2007.03.004

采用直流电弧法使金属钽和氮气直接反应制备出了TaN纳米粉.利用XRD、XPS、TEM等测试方法对所制备的TaN纳米粉进行了表征.结果表明:所制备的纳米粉为单一的立方相TaN,纳米颗粒的平均粒度为5～10nm.实验中还发现氮气的气压对制备纯立方相TaN具有关键性作用,并讨论了立方相TaN的形成机理.

关键词: 立方相TaN , 纳米粉 , 直流电弧法

Microstructural study on multilayer FeTaN/TaN (5) films

Materials Letters

The microstructure of [FeTaN/TaN](5) multilayer films has been investigated by transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM) in cross section and plan view. Each layer shows a small surface roughening less than 1 nm. The FeTaN layers are composed of b.c.c. Fe with Ta incorporated substitutionally and N interstitially, denoted as Fe(Ta,N); while the TaN layers mainly consist of f.c.c. TaN phase. A [110] texture of Fe(Ta,N) has been formed in the FeTaN layers. The columnar grain structure is a typical feature in FeTaN layers. (C) 2003 Elsevier Science B.V. All rights reserved.

关键词: microstructure;thin films;magnetic materials;transmission electron;microscopy (TEM);sputtering;fetan thin-films;magnetic-properties;recording-heads;tantalum;nitride;temperature

High temperature naphthenic acid corrosion of steel in high TAN refining media

Anti-Corrosion Methods and Materials

Purpose - This paper aims to study the corrosion behavior of carbon steel and stainless steel in white oil with naphthenic acid under high temperature. Design/methodology/approach - The weight-loss method and surface analysis were used to study the corrosion behavior of steel in white oil with naphthenic acid. Findings - Naphthenic acids corrosion rates were directly related to experimental temperature, immersion time and total acid number (TAN). The activation energy was calculated and the process kinetics could be represented by Arrhenius-type equation. The relationship between the isothermal line in liquid phase and that in vapor phase at different TAN values had a significant distinction with the change of temperature. Originality/value - The findings have important implications for assessing the corrosivity of crude oils with high TAN value from various resources.

关键词: Corrosion;Stainless steel;Oils;Acids;refineries

A study on intelligent ceramics

Wenbo FEI

材料科学技术（英文）

This paper shows that it is easier to form intelligent ceramics than other materials. Self-adaptive factors and relevant function mechanisms, which determine the formation of intelligent ceramics, are studied and data from the design of the PLZT with complex functions are presented.

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TaN薄膜局部腐蚀早期过程的ECAFM原位研究

俞春福 , 徐久军 , 黑祖昆

腐蚀与防护 doi:10.3969/j.issn.1005-748X.2004.03.005

电化学原子力显微镜(ECAFM)可以在液体环境下工作,能原位观察电极反应过程中的腐蚀界面形貌.文章介绍利用ECAFM从纳米空间分辨度上原位研究离子束增强沉积TaN膜在0.4mol/L HCl溶液中的局部腐蚀早期过程,结果发现,表面形貌为颗粒状结构的TaN膜在0.4mol/L HCl中进行阳极极化时,颗粒结构的微观顶峰优先溶解,导致颗粒高度降低,边界扩大蔓延,使膜层表面趋于平整化.

关键词: 电化学原子力显微镜 , TaN , 原位 , 腐蚀

Effect of Bi₂O₃ Additive on the Microstructure and Dielectric Properties of BaTiO₃-Based Ceramics Sintered at Lower Temperature

Shunhua Wu Xuesong Wei Xiaoyong Wang Hongxing Yang Shunqi Gao

材料科学技术（英文）

High performance X8R dielectric ceramics were prepared by doping Bi₂O₃ to BaTiO₃-based ceramics. The effect of small amounts (≤1.2 mol%) of Bi₂O₃ additive on the microstructure and dielectric properties of BaTiO₃-based ceramics have been investigated. The Bi₂O₃, acting as a sintering additive, can effectively lower the sintering temperature of BaTiO₃-based ceramics from 1300 to 1130°C. The bulk density of BaTiO₃-based ceramics increased and reached the maximum value with increasing Bi₂O₃ content. The dielectric constant increased with increasing Bi₂O₃ until it reached the maximum value with 0.8 mol% Bi₂O₃ additive, and the dielectric loss decreased with increasing Bi₂O₃ content. Optimal dielectric properties of ε=2470, tanδ=0.011 and Δε/ε₂₅≤±9% (-55-150°C) were obtained for the BaTiO₃-based ceramics doped with 0.8 mol% Bi₂O₃ sintered at 1130°C for 6 h.

关键词: BaTiO₃-based ceramics , Bi2O3 , Dielectric properties , X8R

不同调制周期Cu/TaN多层膜的微结构与表面形貌

赵海阔 , 雒向东

量子电子学报 doi:10.3969/j.issn.1007-5461.2009.01.018

采用磁控溅射方法在Si(111)基底上沉积不同调制周期的Cu/TaN多层膜,用X射线衍射仪(XRD)与原子力显微镜(AFM)表征薄膜微结构与表面形貌,研究了不同调制周期L薄膜的微结构与表面形貌.结果表明:不同L的TaN调制层均为非晶结构,多晶Cu调制层的晶粒取向组成随着L改变而变化; Cu调制层的表面粗糙度Rrms.大于TaN调制层的Rrms;与Cu单层膜相比,最外层为Cu调制层的Cu/TaN多层膜的Rrms较小;与TaN单层膜相比,最外层为TaN调制层的Cu/TaN多层膜的/Rrms较大;随着L增加,多层膜与对应的单层膜之间的兄Rrms差值逐渐减小.

关键词: 光电子学 , Cu/TaN , 多层膜 , 调制周期 , 表面形貌