Tribology Measurement by Thin Layer Activation Method Using Proton Beam

讨论了一种用薄层活化法测量铁磨损的方法。铁表面通过^<56>Fe（p，n）^<56>Co反应等活化，使用串列货车德格拉夫加速器的7.00 MeV质子束。0.5-1 μ A的豆电流的照射<56>在约50 μ m厚的层中产生1-10 μ Ci的^ Co活性。为了获得钴活性的基本深度分布，使用具有3 mm直径活化区域的1.5cm铁立方体来产生磨损校准曲线。通过抛光机产生磨损，并通过精密电动千分尺测量磨损厚度。监测辐射仪器是一个3英寸。直径X 3英寸NaI（Tl）闪烁体和高纯Ge探测器。根据铁磨损厚度，得到了详细的铁磨损标定曲线<56><57><58>，并将薄层活化技术应用于发动机凸轮尖铁磨损的在线测量。用锗半导体探测器在线无损测量了该活化件的磨损量。为了将该方法应用于真实的汽车发动机零件（发动机凸轮前端），建立了微机数据采集系统。成功地测量了磨损特性，验证了该方法的有效性。

A method of measuring iron wear using thin layer activation is discussed. The iron surface is activated by a ^<56>Fe(p, n)^<56>Co reaction etc., using a 7.00 MeV protom beam from a tandem Van de Graff accelerator. Irradiation of 0.5-1 muA bean currents produces 1-10 muCi of ^<56>Co activities in a layer about 50 mum thick. To get the basic Depth profile of cobalt activities, a 1.5 cm iron cube with a 3 mm diameter activation area is used to produce a wear calibration curve. Wear is produced by a polishing machine and wear thickness is measured by a precise electric micrometer. Monitoring radiation instruments are a 3 in. diameter X 3 in. NaI (Tl) scintillator and a high-purity Ge detector. A detailed iron wear calibration curve using ^<56>Co, ^<57>Co and ^<58>Co activities is obtained in accordance with iron wear thickness.Thin layer activation technique was applied to the on-line iron wear measurement of engine cam nose. The wearing amount of this activated part was measured using Ge semiconductor detector by on-line and nondestructive method. For the application of this method to the real car engine part (engine cam nose), the data acquisition system using microcomputers was built. The wear characteristics were successfully measured and an effectiveness of this method was verified.