| 摘要 |
PURPOSE:To provide a large-capacity X-ray tube which has a high load capacity as well as a high heat capacity and in which any crack breakdowns are prevented by increasing the mechanical strength of a rotor shaft which supports a target producing X-rays. CONSTITUTION:A surface intensified film 8 of over 10mum thickness formed by subjecting a highly heat-resisting metal such as tungsten to flame coating, is provided over the entire outer peripheral surface of a rotor shaft 3b. Here, the film 8 is formed by melting tungsten by plasmas before molten tungsten is sprayed over the outer peripheral surface of the rotor shaft 3b at high air pressure. According to such constitution, numberless cuts formed on the outer peripheral surface of the rotor shaft 3b are completely filled and the rotor shaft 3b entirely coated with the film 8 made of tungsten. As a result, concentrated stress developing in the cuts is alleviated, and any crack breakdowns can be positively prevented. |
