Montasser M.Dewidar
,
Jae-Kyoo LIM
,
K.W.Dalgarno
材料科学技术（英文）
Layer manufacture technologies are gaining increasing attention in the manufacturing for the production of polymer mould tooling. Layer manufacture techniques can be used in this potential manufacturing area to produce tooling either indirectly or directly, and powder metal based layer manufacture systems are considered as an effective way of producing rapid tooling. Mechanical properties and accuracy are critical for tooling. This paper reports the results of an experimental study examining the potential of layer manufacturing processes to deliver production tooling for polymer manufacture. A comparison between indirectly selective laser sintering and directly selective laser sintering to provide the tooling was reported. Three main areas were addressed during the study: mechanical strength, accuracy, and build rate. Overviews of the results from the studies were presented.
关键词:
Selective laser sintering
,
laser
,
sintering
,
layer
,
manufact
马力
,
张亚明
表面技术
doi:10.16490/j.cnki.issn.1001-3660.2016.04.037
作为一种应用十分广泛的金属材料表面后处理工艺,氩弧重熔技术具有均匀金属材料的表层组织、减缓焊接接头的残余应力、改善金属基体与强化层之间的界面结合状态等优点,在一定程度上可以提高金属及表面强化层的性能.综述了氩弧重熔工艺的原理、特点及工艺参数(重熔电流、移动速度、氩气流量和电弧长度)对重熔效果的影响,着重介绍了氩弧重熔技术在金属表面(铸铁、钢和合金)及其表面强化层(涂层、热浸镀层、渗层和堆焊层)后处理过程中的应用进展.最后探讨了金属及表面强化层氩弧重熔工艺的发展方向:1)强化内在机理研究及界面反应状态研究;2)完善快速凝固理论和界面结构研究;3)提升强化层的结构设计与氩弧重熔工艺条件的契合度;4)加强相关的数值模拟研究.
关键词:
氩弧重熔
,
重熔原理
,
铸铁
,
涂层
,
热浸镀层
,
渗层
,
耐磨性
李嘉
,
石峰晖
,
吕晶
,
张宝艳
复合材料学报
doi:10.13801/j.cnki.fhclxb.20150323.001
针对一种电弧法制备的石墨烯材料,通过X射线光电子能谱、拉曼光谱、红外光谱和扫描电镜分析等方法进行了表征与评价.结果表明:石墨烯中C元素含量为89.77％,O元素和N元素含量分别为3.03％和7.21％;通过拉曼光谱中G峰和2D峰的位置确定石墨烯样品以多层石墨烯为主;红外光谱显示石墨烯样品吸附了水分子;显微结构观察确定了石墨烯片层结构的层数及尺寸.根据实验方法总结了一套石墨烯的测试表征方案,为石墨烯在复合材料中的推广应用提供了评价依据.
关键词:
石墨烯
,
片层
,
表征
,
评价
,
复合材料
