Pulsed glow discharge electron gun for metal surface treatment

Includes bibliographical references (page 262).Se ha desarrollado un cañón de electrones de cátodo frío para el tratamiento térmico de superficies metálicas. El canon prove pulsos de electrones altamente monoenergéticos de hasta 120A y de duración entre 10μs y 30μs ajustable entre 15keV y 30keV. La profundidad de la pellcula fundida depende de la penetración de los electrons y de la difusión del calor. En enfriado rápido contra el sustrato da lugara cambios en la microestructura de la superficie. Se presentan resulta dos abrenidos con muestras de acero inoxidable. Se muestra que a pesar de la alta energia del haz de electrones, el área fundida es menor que lo esperado. Se discuten las possibles causas de esta discrepancia. A pulsed glow discharge electron beam has been developed for the thermal treatment of metal surfaces. The gun provides highly monoenergetic electron pulses adjustable between 15Kev and 30Key, of up to 120A, lasting between 10μs and 30μs. The depth of the melted film depends on both the electron penetration and the heat diffusion. The fast cooling against the substrate yields changes in the surface microstructure. Results obtained with stainless steel samples are presented. It is shown that despite the high energy of the electron beam, the melted area results smaller than expected. The possible source of this discrepancy is discussed

Stabilization of a cold cathode electron beam glow discharge for surface treatment

Includes bibliographical references (page 4120).We have demonstrated that the reproducibility of electron beam pulses generated by a high power, cold cathode glow discharge is greatly improved by adding a small continuous keep-alive discharge current. A current of the order of 200 μA was found to limit the shot to shot current variation to within 1.5%. This stabilization in turn reduces by an order of magnitude the fluctuations of the energy density deposited on the target, demonstrating a reliable energy source for surface treatment