共查询到20条相似文献,搜索用时 93 毫秒
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本文是在查阅了国内外相关资料,并在大量的攻关试验的基础上,系统地介绍了关于电镀层内应力的概念,产生机理,电镀过程中产生应力的因素,应力对镀层及工件机械性能的影响,以及消除应力不良影响的办法,并介绍了镀层内应力的测量方法。 相似文献
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影响镍镀层内应力的因素及排除方法 总被引:8,自引:0,他引:8
镀镍层内应力对其性能影响较大简单介绍了镀层内应力的一种定性测定方法-条形阴极法,并列出了其半定量的计算公式分析了影响镀镍层内应力的几种因素:电镀光亮剂、pH值、电流密度、温度及杂质提出了相应的排除方法,并指出重视镀液的维护与管理是有效控制镀层内应力的主要方法。 相似文献
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稀土对电沉积Ni-Fe-P-RE合金镀层的影响 总被引:1,自引:0,他引:1
通过正交试验优化镀液配方,获得Ni-Fe-P-RE非晶态合金镀层.通过x-荧光镀层成分检测,显微硬度仪硬度检测及耐蚀试验,结果表明:添加适量的稀土元素不但对复合镀层中各成分有着重要的影响,而且显著提高镀层的硬度及耐蚀性. 相似文献
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含氟羟基磷灰石(FHA,Ca10(PO)46F2~x(OH)x)涂层由于比羟基磷灰石涂层的溶解度低、线胀系数小且生物活性好等优点,受到生物学界的广泛重视。本文介绍了FHA的性能特点以及涂层的制备技术,并认为系统研究FHA涂层中的氟含量即F^-对OH^-的取代量对FHA溶解性能以及生物活性性能的影响,将决定FHA涂层的实际应用。 相似文献
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Electron beam assisted physical vapor deposition of very hard TiCN coating with nanoscale characters
《Ceramics International》2019,45(12):14821-14828
The work concerns electron beam assisted physical vapor deposition (EB-PVD) of titanium carbo-nitride (TiCN) on D2 tool steel. First, D2 steel substrate was heat treated to support and improve the load bearing capacity of the coating. To reduce the intrinsic gap between D2 substrate and TiCN coating and to improve the adhesive strength of the coating, a thin bond coat of Ti was EB-PV deposited on D2 steel prior to TiCN coating. The deposited coating was characterized in depth using XRD, SEM, AFM, profilometry and nanoindentation; its performance was assessed by the wear tests. The results demonstrated that EB-PVD process is successful in uniform deposition of nanograined (5.7 nm) TiCN coating; this character of the coating enhances its mechanical responses and cohesive strength. AFM topographic characterization confirms nanoscale smoothness of the TiCN coating which is a key factor in upgrading the wear resistance and tribological behavior of the coating. Nanoindentation results showed that the deposited coating is very hard; it is also tough enough. The hardness of the TiCN in this work is too much higher than those reported in the literature by similar works. AFM and nanoindentation results showed that a TiCN coating with thickness of 1.6 μm and roughness of 22 nm exhibits a hardness of 3552 HV which is much higher than those hardnesses reported in previous works. The wear tests showed that the deposited TiCN coating has a higher wear resistance than the D2 steel as well as TiN coating; this better performance is attributed to the modifications made in the coating process and its nanoscale characters. 相似文献
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鉴别机车涂层起泡原因并有针对地预防和控制对保证其涂装质量十分关键。本文介绍了通过对机车涂层起泡现象的分析,并且从涂装前处理、底漆的涂装、腻子的刮涂、腻子涂层的打磨、喷涂中涂漆、喷涂面漆等方面进行质量控制,以提高机车涂装质量。 相似文献
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CHUN-HWAY HSUEH 《Journal of the American Ceramic Society》1988,71(6):490-493
A methodology is described to evaluate the shear strength at the fiber–coating interface. Stress analyses are performed for the following system: a fiber with a uniform coating in its central portion which is subjected to an axial tensile stress through its bare ends. The results show that the axial tensile stress in the coating decreases with the increase in the thickness of the coating and that the interfacial shear stress exhibits the opposite trend. Hence, a critical thickness of the coating can be defined depending on the properties of the material, such that when the coating thickness is less than the critical value, failure of the composites initiates from segmentation of the coating during tensile loading. Conversely, when the coating thickness is greater than the critical value, debonding of the interface occurs. Furthermore, the interfacial shear strength can be related to this critical thickness and the tensile strength of the coating. 相似文献
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讨论了空气的质量及流动对涂装生产各环节的影响,环境空气的质量影响涂装外观,喷涂设备使用的压缩空气的质量影响涂装质量的稳定性,其中颗粒、毛絮和水、油的存在会造成缩孔缺陷;作为热量传导介质的固化烘箱内的空气的温度及其均匀性对涂层抗冲击性能、色泽稳定性等具有影响;人体呼吸的空气被涂装过程粉尘、漆雾和挥发性溶剂的污染直接危及人体健康。 相似文献