텅스텐의 열충격 손상에 대한 초음파 특성 평가"

Abstract

Tungsten is used as a high temperature component because it does not change its mechanical and physical properties even at high temperatures, and it is manufactured by sintering. However, it is hard to produce tungsten because of the high sintering temperature. One of objectives of this study is to lower the sintering temperature by using additives and pressure. The damage characteristics due to thermal shock on the tungsten produced by this liquid phase sintering method were evaluated using a nondestructive technique. By using the ultrasonic pulse receiver technique, the amplitude and attenuation coefficient of the ultrasonic wave were measured as the thermal shock cycle of the material was increased, and the relationship between the thermal shock cycle and the attenuation coefficient was analyzed. It has been found that the tungsten surface crack increases as the thermal shock cycle increases, and the attenuation coefficient increases linearly due to scattering of wave by increasing cracks.