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首页> 外文期刊>Ceramic Engineering and Science Proceedings >NONDESTRUCTIVE EVALUATION OF SILICON-NITRIDE CERAMIC VALVES FROM ENGINE DURATION TEST
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NONDESTRUCTIVE EVALUATION OF SILICON-NITRIDE CERAMIC VALVES FROM ENGINE DURATION TEST

机译：引擎持续时间测试中的氮化硅陶瓷阀门的非破坏性评估

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In this study, we investigated impact and wear damage in silicon-nitride ceramic valves that were subjected to an engine duration test in a natural-gas engine. A high-speed automated laser-scattering system was developed for the nondestructive evaluation (NDE) of 10 SN235P silicon-nitride valves. The NDE system scans the entire valve surface and generates a two-dimensional scattering image that is used to identify the location, size, and relative severity of subsurface damage in the valves. NDE imaging data were obtained at before and at 100 and 500 hours of the engine duration test. The NDE data were analyzed and compared with surface photomicrographs. Wear damage was found in the impact surface of all valves, especially for exhaust valves. However, the NDE examinations did not detect subsurface damage such as cracks or spalls in these engine-tested valves.
机译：在这项研究中，我们调查了在天然气发动机中经过发动机持续时间测试的氮化硅陶瓷阀的冲击和磨损损坏。开发了一种高速自动激光散射系统，用于10个SN235P氮化硅阀的无损评估（NDE）。 NDE系统扫描整个阀门表面并生成二维散射图像，该图像用于识别阀门中地下损坏的位置，大小和相对严重性。 NDE成像数据是在发动机持续时间测试之前以及分别在100和500小时获得的。 NDE数据进行了分析，并与表面显微照片进行了比较。在所有气门的冲击表面发现磨损损坏，尤其是排气门。但是，NDE检查并未在这些经过发动机测试的阀门中发现地下损坏，例如裂缝或剥落。

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