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Structural changes of WC-CoCr thermally sprayed coatings after dry sliding experiments and real application

机译：干式滑动实验后WC-Cocrox热喷涂涂层的结构变化和实际应用

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In offshore oil and gas production there is a need to control the flow of fluid from the well. This is done by placing a x-mas tree on top of the well that contains several valves, usually of gate and seat configuration, for controlling the well. While closing and opening the valve the sealing surfaces experience very high mechanical loads due to well pressures up to 137.9 MPa (20000 Psi). During qualification of the valves there is no external lubrication and thus intimate contact between the surfaces will occur. This situation can lead to increased friction, wear, galling and eventually lead to total failure of the component if not controlled properly. For this reason modification of the surface structure or by applying a coating is necessary. Typical coatings used for valve application are HVOF WC-based coatings. This work investigates why and when the limit for mild wear and stable friction is reached and what mechanisms are dominant. Tribological tests have been done on such coatings with different contacting geometries and loads to best mimic the wear and friction experienced on actual gate valve components. After experiments the specimens were characterized and studied by SEM, EDX, XRD, nano indentation and FIB cross section milling and then compared with characterized specimens of real gate valve components.
机译：在海上石油和天然气生产中，需要控制流体的流量。这是通过将X-MAS树放在井顶部来完成的，该树包含几个阀门，通常是门和座椅配置，用于控制井。在关闭和打开阀门的同时，密封表面由于高达137.9MPa（20000 psi）的良好压力而经历非常高的机械负载。在阀门的资格期间，没有外部润滑，因此将发生表面之间的紧密接触。这种情况可能导致摩擦，磨损，磨损，最终导致组件的总失效，如果没有正确控制。由于这种原因，表面结构或通过涂覆涂层是必要的。用于阀施加的典型涂层是HVOF基涂层。这项工作调查了为什么和当达到温和磨损和稳定摩擦的限制以及占主导地位的机制。在具有不同接触几何形状的这种涂层上已经完成了摩擦学测试，并且负载最佳模仿实际闸阀部件上所经历的磨损和摩擦。经过实验后，通过SEM，EDX，XRD，纳米压痕和FIB横截面铣削进行并研究样品，然后与真正闸阀部件的表征样本进行比较。

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