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Automated Laser Scatter Detection of Near-Surface Defects and Machining Damage in Ceramic Components

机译:陶瓷零件近表面缺陷和加工损伤的自动激光散射检测

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摘要

The need to achieve higher gas firing temperatures in new stationary gas turbines has led to the requirement for stronger, longer-lasting materials capable of functioning in environments more severe than traditional materials permit. The higher operating temperatures seen in these environments (\u3e1300 °C) would substantially increase energy efficiency and reduce emissions. Because conventional materials are not suitable, alternate materials are being considered for turbine components. Included among these are the Si3N4 ceramics. In an effort to improve and extend the working lifetime of the components, improvement in the detection of critical defects (such as cracks, voids, inclusions, or microstructural variations) in their surface and near-subsurface regions is being investigated. Although all of the defects can occur either during manufacturing or in operation, the specific type of defect most likely to occur in a given component depends on a various factors, including the material system, processing and machining parameters, component geometry, and application environment.
机译:在新的固定式燃气轮机中需要达到更高的燃气燃烧温度,这导致需要能够在比传统材料所允许的环境更恶劣的环境中运行的更坚固,更持久的材料。在这些环境中所见的较高工作温度(1300°C)将大大提高能源效率并减少排放。由于常规材料不合适,因此正在考虑将替代材料用于涡轮机部件。其中包括Si3N4陶瓷。为了改善和延长组件的工作寿命,正在研究在其表面和近地下区域中检测关键缺陷(例如裂纹,空隙,夹杂物或微结构变化)的方法。尽管所有缺陷都可能在制造或操作过程中发生,但是最有可能在给定组件中发生的特定类型的缺陷取决于各种因素,包括材料系统,加工和加工参数,组件几何形状以及应用环境。

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