材料期刊网

熔融纺丝方法制备纳米碳管/聚丙烯复合纤维及其拉伸性能

李仲 , 英哲 , 刘敏 , 成会明

新型炭材料 doi:10.3969/j.issn.1007-8827.2005.02.003

采用传统的熔融纺丝技术大量制备了定向性良好的纳米碳管/聚丙烯复合纤维.扫描电镜观察证实了纳米碳管在纤维里的定向性以及分散性都得到了较大的改善.通过拉伸实验测试了纳米碳管/聚丙烯复合纤维的力学性能,采用Weibull统计分析发现纳米碳管的添加显著提高了复合纤维的拉伸强度,当添加纳米碳管的质量分数达到3...

关键词: 多壁纳米碳管 , 聚丙烯 , 复合纤维 , 熔融纺丝 , 拉伸强度

浸渍硼氧化物改善柔性石墨的氧化稳定性和力学性能

新型炭材料 doi:10.1016/S1872-5805(12)60001-8

膨胀石墨经硼氧化物浸渍修后辊轧制成柔性石墨箔.应用激光质谱、X-光电子谱、扫描电镜和热重测定分析了所制柔性石墨箔.结果表明:浸渍硼氧化物后石墨箔的初始氧化温度提高了约150℃.即使浸渍少量(质量分数低于2％)的硼氧化物也能提高此材料的拉伸强度.纵观其浸渍改善效果,可能归因于膨胀石墨粒中与石墨片层化学...

关键词: 膨胀石墨 , 石墨箔 , 硼氧化物 , 氧化防护 , 拉伸强度

2219铝合金单、双道焊接头性能分析

鄢东洋 , 吴会强 , 常志龙 , 郭彦明 , 黄诚

宇航材料工艺

通过对比2219铝合金单道氩弧焊和氦弧打底+氩弧盖面双道焊接头的常温及液氮温度拉伸性能、显微硬度分布、单向拉伸过程的数字散斑测量(DIC)结果,发现在常、低温条件下双道焊接头的拉伸强度和延伸率均比单道焊接头高10％～20％,单道焊接头焊缝及热影响区内材料的显微硬度值相比母材的降低程度比双道焊接头更为...

关键词: 2219铝合金 , 氩弧焊 , 拉伸强度 , 延伸率 , 显微硬度 , 数字散斑测量

含空位缺陷单壁碳纳米管断裂行为的有限元模拟

张续 , 齐乐华 , 舒扬 , 付前刚 , 李贺军

新型炭材料

提出了碳碳键的断裂准则,建立了含空位缺陷碳纳米管的有限元模型,基于此断裂准则采用有限元方法对单壁碳纳米管的断裂行为进行了模拟研究,计算得到了碳纳米管的抗拉强度和极限应变,并研究了单原子空位缺陷对碳纳米管抗拉强度和极限应变的影响。结果表明理想单壁碳纳米管的抗拉强度约为100 GPa,极限应变约为20%...

关键词: 单壁碳纳米管 , 空位缺陷 , 有限元法 , 抗拉强度 , 极限应变

Effects of Nitridation on Properties of SiC Fiber and Interface of Ti Matrix Composite

Nanlin SHI , Jiwei FENG , Yanfen GUO , Yuyin LIU , Z.X.Guo

材料科学技术（英文）

Prenitridation of the TiBx coating surface of the Sigma SM1240 SiC fiber can form more stable compounds at the surface and obstruct the release of boron atoms into the Ti-based alloy matrix. The effect of nitridation on the tensile strength of the fiber was investigated in this work. Nitridation cou...

关键词: SiC fiber , null , null , null , null

Influence of Processing Parameters on the Mechanical Properties of a Plasma Radical Nitrided SCM440 Steel

Seok-Hwan Ahn , Insup Lee

材料科学技术（英文）

Plasma radical nitriding was performed to harden the surface of SCM440 steel for 1-10 h at temperature range of 450-550℃. This process involved the use of NH3 gas instead of N2 gas employed for the well-established plasma nitriding method. No compound layer was formed during this process except the ...

关键词: Plasma radical nitriding , null , null , null

Development of a Nickel-base Cast Superalloy with High Strength and Superior Creep Properties

Jieshan HOU , Jianting GUO , Lanzhang ZHOU

材料科学技术（英文）

Derived from Russian alloy CHS88U, six experimental Ni-base alloys named as A to F in the Ni-Cr-Co-W-Ti-Al-Hf system are designed, evaluated and processed. One of these alloys, F, shows excellent high temperature tensile strength and ductility with superior creep rupture properties. As predicted by ...

关键词: Conventional Ni-base superalloy , null , null , null

High Temperature Tensile Properties of 30 vol. Pct ZrCp/W Composite

Yujin WANG , Yu ZHOU , Guiming SONG , Tingquan LEI

材料科学技术（英文）

In order to improve the high temperature strength of tungsten, 30~vol. pct ZrC particles were added to the tungsten matrix to form a 30ZrCp/W composite. The tensile properties from 20℃ to 1880℃ of the composite were examined. It was shown that with increasing testing temperature, the nonlinearity of...

关键词: ZrCp/W composite , null , null , null

Influences of Ag and Au Additions on Structure and Tensile Strength of Sn-5Sb Lead Free Solder Alloy

A.A.El-Daly

材料科学技术（英文）

It is important, for electronic application, to decrease the melting point of Sn-5Sb solder alloy because it is relatively high as compared with the most popular eutectic Pb-Sn solder alloy. Adding Au or Ag can decrease the onset melting temperature (233℃) of this alloy to 203.5℃ and 216℃, respectiv...

关键词: Sn-Sb solder , null , null , null

Improvement of Weld Quality Using a Weaving Beam in Laser Welding

Xudong ZHANG , Wuzhu CHEN , Gang BAO , Lin ZHAO

材料科学技术（英文）

This paper describes a way to improve the weld quality through suppressing the porosity formation and restraining the growth of columnar grains by using a weaving beam in laser welding. The experimental results show that the N2 porosity of beam-weaving laser welding low carbon steel can be remarkabl...

关键词: Welding , null , null , null