K.Palanikumar
,
L.Karunamoorthy
,
R.Karthikeyan
材料科学技术（英文）
In recent years, glass fiber reinforced plastics (GFRP) are being extensively used in variety of engineering applications in many different fields such as aerospace, oil, gas and process industries. However, the users of FRP are facing difficulties to machine it, because of fiber delamination, fiber pull out, short tool life, matrix debonding, burning and formation of powder like chips. The present investigation focuses on the optimization of machining parameters for surface roughness of glass fiber reinforced plastics (GFRP) using design of experiments (DoE). The machining parameters considered were speed, feed, depth of cut and workpiece (fiber orientation). An attempt was made to analyse the influence of factors and their interactions during machining. The results of the present study gives the optimal combination of machining parameters and this will help to improve the machining requirements of GFRP composites.
关键词:
Optimization
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null
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null
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null
Zhufeng YUE
材料科学技术（英文）
A phenomenological anisotropic model has been presented for the surface roughness modeling of pack rolling. The model is an assembly of grains in different orientations and sizes. The grain size is assumed to be in log-normal distribution. To model the macro anisotropic mechanical behavior of the grains induced by the slip deformation, the grains are assumed as isolated anisotropic units. The units have different mechanic behavior, and depend on the crystallographic orientations and the external loading as well as the interaction of the adjunctive grains. In the paper, the material properties of the grains are assumed as uniform distributions. The roughness of the contact surfaces depends on the distribution types and the scatters of the distributions. It is found that the initial roughness of the contact surfaces has a little influence on the surface roughness when the rolling deformation is large. The comparison between the phenomenological model and crystallographic model shows that the phenomenological model can also give out a reasonable result, while it only takes much less CPU time. The agreement between the single sheet model and the pack rolling model shows that in a certain degree the pack rolling model can be replaced by the single sheet model to decrease the CPU time.
关键词:
Phenomenological anisotropic model
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null
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null
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null
何健
,
徐中民
,
宋丽
,
王劼
,
王纳秀
材料科学与工程学报
doi:10.14136/j.cnki.issn 1673-2812.2015.05.014
为了研究不同尺寸的金刚石颗粒、不同切速比(进给速度与线速度之比值)、金刚线切割时间与不同往复切割次数对晶体色散元件表面粗糙度的影响,主要采用四种不同线径的电镀金刚石线在上述条件下做切割晶面(111)单晶硅分光晶体的实验,并实现在脆性材料单晶硅的塑性区域进行线切割加工.结果表明:在塑性区域加工单晶硅分光晶体的表面粗糙度与金刚石颗粒尺寸成正比、与切速比有密切关系,增加往复切割的次数可以有效降低分光晶体的表面粗糙度.此次研究能够给上海同步辐射光源晶体色散元件加工提供一定的参考价值.
关键词:
金刚石线
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色散元件
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表面粗糙度
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颗粒度
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切速比
赵永岗
,
张春刚
,
王辉
,
孙杰
,
孙慧艳
表面技术
doi:10.3969/j.issn.1001-3660.2009.06.028
化学铣切是一种能使表面形状复杂、加工精度要求高的零件达到加工要求的表面处理方法.阐述了钛合金化学铣切的反应机理,对钛合金化学铣切的工艺过程以及影响因素,如零部件的表面清冼、防护层的涂覆、刻型等进行了探讨.钛合金零件的表面清洗一般采取用浸渍有机溶剂的棉布擦洗和热碱洗的方法.化铣保护涂层除了应具有良好的附着力和耐蚀性外,还应具有良好的可剥性以及与化铣溶液的配套性.在化学腐蚀过程中,除了要防止产生小孔和形成粗糙的表面外,还要防止材料发生氢脆.此外,还对化学铣切液各成分的作用以及化学铣切对表面粗糙度的影响进行了讨论.
关键词:
钛合金
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化学铣切
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工艺
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表面粗糙度
李俊峰
,
卢鹉
,
罗正平
,
赵立波
宇航材料工艺
以氧化铁、碳化硅和氧化钴为高辐射填料,通过控制涂层浆料固含量和喷涂次数制备出了不同表面粗糙度的高辐射涂层.用AE辐射计测试了不同表面粗糙度高辐射涂层的室温发射率,根据GB/T 7287-2008测试了涂层的800℃高温发射率,用扫描电子显微镜和光学显微镜观察了涂层表面形貌,用扫描探针显微镜测试了涂层的表面粗糙度.结果表明,在辐射换热条件下高辐射涂层表面粗糙度在2.75～225.70 μm变化时,其室温发射率发生了0.02～0.05的变化.而在导热换热条件下高辐射涂层表面粗糙度在2.75～36.99μm变化时,其高温发射率没有变化.
关键词:
表面粗糙度
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涂层
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室温发射率
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高温发射率
黄翀
,
李成
,
欧阳艳东
,
刘骥
,
吴永俊
功能材料与器件学报
Al薄膜作为钼/铝/钼三层金属桥的中间层,在电容式触摸屏中起到ITO图形搭桥的作用.金属Al在可见光范围内具有较高的反射率,导致在电容屏上有金属桥的部分反射率大于周边没有金属桥的部分,影响屏幕的显示效果.为了减少Al薄膜的反射率,可以采取增大Al薄膜表面粗糙程度的办法,增加漫反射.在不同的直流磁控溅射工艺下制备了表面粗糙度不同的Al薄膜,并分析了引起粗糙度不同的原因.得出了解决金属桥影问题的工艺条件.
关键词:
触摸屏
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表面粗糙度
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Al薄膜
