欧瑞康巴尔查斯DLC涂层经验证后性能可靠的阀门解决方案

<正>由欧瑞康巴尔查斯研发的客制化DLC涂层可以显著提高应用于石油天然气、化工/石化和加工业领域的各种阀门的性能和可靠性。阀门和制动器是系统安全可靠生产的重要环节。尽管使用不锈钢和镍合金结合的热喷涂WC涂层可以提高阀座,阀门和阀球的脂和密封性能,但是在很多情况     

欧瑞康巴尔查斯推出阀门解决方案

<正>阀门和制动器是系统安全可靠生产的重要环节,尽管使用不锈钢和镍合金结合的热喷涂WC涂层可以提高阀座、阀门和阀球的脂和密封性能,但是在很多情况下仍未解决高摩擦问题。由欧瑞康巴尔查斯研发的DLC涂层展现了非常优秀的抗摩擦、抗磨损和提升轴承     

陶瓷涂层蝶阀的设计

介绍了陶瓷涂层耐海水蝶阀的工作原理、结构特点及性能,论述了陶瓷涂层性能参数、喷涂与维护方法,及阀门主要零部件的材料选用。     

镀膜涂层表面组织与性能的研究

根据表面涂层技术发展的现状,利用物理气相沉积技术对阀门零件进行表面涂覆,选择旋塞阀为阀芯对象,进行磁控溅射复合镀膜,并对其镀膜后的表面组织和性能进行了测定和分析,涂层与基体有极高的结合强度,阀门零件的耐磨性大为提高.     

调节阀零件表面的激光涂覆

介绍了调节阀阀芯和阀座零件的工作表面经激光涂覆处理后,其涂层组织结构细密,与基体结合良好;零件热影响小,无变形;涂层硬度高、抗腐蚀性强,可有效改善零件工作表面的性能,提高阀门使用寿命。     

陶瓷涂覆技术在阀门中的应用

针对阀门易被腐蚀磨损的情况,提出等离子喷涂陶瓷技术,对阀门进行表面改性.选择旋塞阀的阀芯为对象,以氧化物陶瓷为喷涂材料,阐述等离子喷涂的工艺、设备及参数、涂层厚度设计等,使涂层与基体达到较高的结合强度并使阀门耐腐蚀能力大为提高.     

热喷涂涂层在阀门上的应用

介绍了热喷涂涂层技术在阀门上的应用。热喷涂是修复强化阀门、延长阀门使用寿命的最经济有效的手段,可用于耐磨、耐腐蚀、耐冲蚀、耐高温氧化以及上述因素综合都存在的工况下。     

热啧涂涂层在阀门上的应用

介绍了热喷涂涂层技术在阀门上的应用.热喷涂是修复强化阀门、延长阀门使用寿命的最经济有效的手段,可用于耐磨、耐腐蚀、耐冲蚀、耐高温氧化以及上述因素综合都存在的工况下.     

静电喷涂在液化气阀门弹簧上的应用

液化气阀门弹簧经静电粉末喷涂处理后,其机械性能符合要求,外观无变形和异常,涂层硬度高,抗腐蚀性强,阀门使用寿命延长,加工成本低。     

滚动轴承材料及热处理进展与展望(续完)

正3 表面涂覆技术表面涂覆技术包括:物理气相沉积(PVD)、化学气相沉积(CVD)、射频溅射(RF)、离子喷涂(PSC)、化学镀等,可提高轴承零件的耐磨性、接触疲劳抗力,并降低表面摩擦因数。3.1 类金刚石涂层类金刚石(DLC)涂层由石墨结构和金刚石结构的碳构成,既具有石墨的润滑及低摩擦性能,又具有金刚石的硬度(1 200HV以上),在许多工业技术中得到应用,如汽车燃料喷射系统、阀门系、齿轮和滚动轴承等,这些涂层在滑动状态下通     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.