材料期刊网

FRACTAL INVESTIGATION OF THE MICROSTRUCTURE IN Alnico8 THERMOMAGNETICALLY TREATED

W.D. Fei , W.G. Chu and D.Z. Yang School of Material Science and Engineering , Harbin Institute of Technology , Harbin 150001 , China

金属学报(英文版)

Fe-Co rich particles in the Alnicos samples thermomagnetically treated fo for various times at 800℃ have been found to be of self-similarity and of fractal characteristics both in two- and three-dimension space. Fe-Co rich particles for 1. 5, 3 and 5min treatments have shown a different fractal nature both in two- and in three-dimension space compared with the case for 10min, which implies that Fe-Co rich particles evolved through fifferent rent kinetic mechanisms. The fractal dimensions for 1.5, 3, 5min as well as 10min treatments derived from the SAXS data in three-dimension space are in good agreement with the theoretical dimensions for two models introduced, respectively. The fractal dimensions in two-dimension space greater than the theoretical ones for two models can be attributed to strong anisotropy of Fe-Co rich particle evolution in three-dimension space.

关键词: Alnico8 , null , null , null

Study on β-TCP Coated Porous Mg as a Bone Tissue Engineering Scaffold Material

Fang Geng

材料科学技术（英文）

Three-dimensional honeycomb-structured magnesium (Mg) scaffolds with interconnected pores of accurately controlled pore size and porosity were fabricated by laser perforation technique. Biodegradable and bioactive β- tricalcium phosphate (β-TCP) coatings were prepared on the porous Mg to further improve its biocompatibility, and the biodegradation mechanism was simply evaluated in vitro. It was found that the mechanical properties of this type of porous Mg significantly depended on its porosity. Elastic modulus and compressive strength similar to human bones could be obtained for the porous Mg with porosity of 42.6%-51%. It was observed that the human osteosarcoma cells (UMR106) were well adhered and proliferated on the surface of the β- TCP coated porous Mg, which indicates that the β-TCP coated porous Mg is promising to be a bone tissue engineering scaffold material.

关键词: Magnesium , Bone tissue engineering , β-TCP coating , Biocompatibility

Study on beta-TCP Coated Porous Mg as a Bone Tissue Engineering Scaffold Material

材料科学技术（英文）

Three-dimensional honeycomb-structured magnesium (Mg) scaffolds with interconnected pores of accurately controlled pore size and porosity were fabricated by laser perforation technique. Biodegradable and bioactive beta-tricalcium phosphate (beta-TCP) coatings were prepared on the porous Mg to further improve its biocompatibility, and the biodegradation mechanism was simply evaluated in vitro. It was found that the mechanical properties of this type of porous Mg significantly depended on its porosity. Elastic modulus and compressive strength similar to human bones could be obtained for the porous Mg with porosity of 42.6%-51%. It was observed that the human osteosarcoma cells (UMR106) were well adhered and proliferated on the surface of the beta-TCP coated porous Mg, which indicates that the beta-TCP coated porous Mg is promising to be a bone tissue engineering scaffold material.

关键词: Magnesium;Bone tissue engineering;beta-TCP coating;Biocompatibility;simulated body-fluid;mechanical-properties;cancellous bone;foam;scaffolds;magnesium;hydroxyapatite;porosity;bioceramics;fabrication;ph

3D Bioplotting of Gelatin/Alginate Scaffolds for Tissue Engineering: Influence of Crosslinking Degree and Pore Architecture on Physicochemical Properties

Pan Ting , Song Wenjing , Cao Xiaodong , Wang Yingjun

材料科学技术（英文） doi:10.1016/j.jmst.2016.01.007

Gelatin/Alginate hydrogels were engineered for bioplotting in tissue engineering. One major drawback of hydrogel scaffolds is the lack of adequate mechanical properties. In this study, using a bioplotter, we constructed the scaffolds with different pore architectures by deposition of gelatin/alginate hydrogels layer-by-layer. The scaffolds with different crosslinking degree were obtained by post-crosslinking methods. Their physicochemical properties, as well as cell viability, were assessed. Different crosslinking methods had little influence on scaffold architecture, porosity, pore size and distribution. By contrast, the water absorption ability, degradation rate and mechanical properties of the scaffolds were dramatically affected by treatment with various concentrations of crosslinking agent (glutaraldehyde). The crosslinking process using glutaraldehyde markedly improved the stability and mechanical strength of the hydrogel scaffolds. Besides the post-processing methods, the pore architecture can also evidently affect the mechanical properties of the scaffolds. The crosslinked gelatin/alginate scaffolds showed a good potential to encapsulate cells or drugs.

关键词: Bioplotting , Tissue engineering , Scaffolds , Gelatin , Alginate

PIP工艺制备2D C/SiC复合材料Z-向穿刺工艺

王其坤 , 胡海峰 , 陈朝辉 , 张玉娣 , 罗征

稀有金属材料与工程

针对2D C/SiC复合材料存在碳布层间缺乏纤维增强,层间结合较差的问题,提出通过Z-向穿刺工艺提高碳布层间结合,克服材料使用时可靠性不高的问题,并比较了穿刺工艺对复合材料微观结构和力学性能的影响.结果表明,通过Z-向穿刺工艺制得试样2D C/SiC-Z_(pin)的弯曲强度、弯曲模量和剪切强度分别为247.8 MPa、37.8 GPa和32.1 MPa,而未穿刺试样2D C/SiC的弯曲强度、弯曲模量和剪切强度分别只有219.3 MPa、34.4 GPa和23.3 MPa,由此可见,采用Z-向穿刺工艺能明显提高复合材料的力学性能.微观结构分析认为,试样力学性能提高的根本原因在于采用Z-向穿刺纤维加强了碳布层间结合,使材料具有较好的整体性,克服了复合材料层间结合较弱对力学性能带来的不利影响.

关键词: 2D , C/SiC , Z-向穿刺 , 微观结构 , 力学性能

Equilibrium and Kinetic Adsorption Study of the Removal of Orange-G Dye Using Carbon Mesoporous Material

KAVEHArzani , BEHDADGhaderiAshtiani , AMIRHOSSEINHajiAboutorabKashi

无机材料学报 doi:10.3724/SP.J.1077.2012.12050

Mesoporous carbon CMK-3 was synthesized by using SBA-15 silica mesoporous as hard template and characterized through nitrogen adsorption/desorption and low angle X-ray diffraction. As-prepared material with large pores and high surface area was used to remove Orange G dye from aqueous solution. Adsorption experiments were carried out as batch studies at variety of contact times, pH, initial dye concentrations, temperatures and salt concentrations. Langmuir and Freundlich isotherm models were employed to simulate the equilibrium data of anionic dye. It was found that the equilibrium data were well represented by the Langmuir isotherm, yielding maximum monolayer adsorption capacity of 189 mg/g. Experimental data were analyzed using pseudo-first order and pseudo-second order kinetic models and obtained results indicated that kinetics followed a pseudo-second order equation.

关键词: CMK-3; Orange G; adsorption isotherm; kinetic

邯钢冷轧厂成功生产IF钢DX56D＋Z

钢铁

近日,集团邯钢公司西区冷轧厂1号镀锌线成功生产出9卷主要应用于汽车面板及高档家电外板的IF钢DX56D＋Z、共70多t,产品的屈服强度、抗拉强度、伸长率和表面质量指标均达到客户要求,为批量生产打下了坚实基础。

关键词: 批量生产 , IF钢 , 冷轧厂 , 邯钢 , 汽车面板 , 屈服强度 , 抗拉强度 , 客户要求

2D-C/SiC复合材料低温动态Z向压缩性能

叶龙海 , 邓琼 , 汤忠斌

复合材料学报

采用Hopkinson压杆试验装置,对2D-C/SiC复合材料进行了低温条件下的Z向动态压缩性能试验研究,低温条件通过控制酒精和液氮的配比系数得到,通过改变波形整形器几何尺寸的方法来实现恒应变率加载,以得到准确、可信的试验结果.试验结果表明:由于复合材料内部含有大量初始微缺陷,2D-C/SiC复合材料在低温动态加载条件下呈现伪塑性行为,其破坏时并未表现出典型的脆性破坏,而是在应力达到压缩强度时出现了显著的应变软化现象,在经历了较大的变形后才最终破坏.随着温度的降低,复合材料的动态Z向压缩强度增加,但失效应变减小.2D-C/SiC复合材料在低温环境下,其内部纤维和基体之间界面结合力增强,同时强的界面结合力可以导致高的压缩强度.

关键词: 陶瓷基复合材料 , Hopkinson压杆试验装置 , 低温 , 动态Z向压缩力学性能 , 界面强度

TC11合金热变形行为及Z-D关系的研究

孙新军 , 白秉哲 , 顾家琳 , 陈南平

稀有金属 doi:10.3969/j.issn.0258-7076.2000.03.003

考察了具有淬火马氏体组织的TC11合金在热压缩变形时的力学行为及显微组织特征. 在各个变形温度和应变速率条件下, TC11合金的应力-应变曲线均表现出先硬化后软化的趋势, 最后都获得一种相对稳定的变形状态; 与此同时, 原始非等轴片层组织通过动态再结晶转变为等轴均匀的组织; 变形温度越低或变形速率越高, 变形应力就越高, 所获得的稳态晶粒尺寸就越小; 通过对实验数据分析后发现, TC11合金在相对高低温区和相对高温区变形分别具有不同的变形激活能并由此导致Z-D关系不同.

关键词: TC11合金 , 热变形 , 力学行为 , 显微组织 , Z-D关系

Z-pins对2D编织陶瓷基复合材料搭接接头连接性能的影响

陶永强 , 矫桂琼 , 王波 , 常岩军

航空材料学报 doi:10.3969/j.issn.1005-5053.2008.06.020

对Z-pins增强2-D编织陶瓷基复合材料搭接接头在单向载荷作用下的连接性能进行了试验研究.试验结果表明Z-pins的加入能够改善2-D编织陶瓷基复合材料搭接接头的连接件能,反映在载荷-位移曲线的后半段,载荷变化出现了波动不大的起伏区域.产生此区域的原因为Z-pins从搭接接头拔出的过程中,与复合材料形成桥联,消耗了部分本该作用在开裂尖端的能量.利用有限元的方法模拟了有、无Z-pins,Z-pins在不同直径和间距下搭接接头的失效过程,并与试验结果相比较,吻合较好.

关键词: 陶瓷基复合材料 , 搭接接头 , Z-pins , 直径 , 间距