Publikations Einzelansicht Titel: Time resolved observation of the erosion of boron containing protective coatings on wall elements of TEXTOR-94 by means of colorimetry   Autor(en):   P. Wienhold, F. Weschenfelder, J. von Seggern, B. Emmoth, H.G. Esser, P. Karduck und J. Winter   Journal: Journal of Nuclear Materials Jahr: 1997 Band: 241-243 Seite(n): 804-809 Zusammenfassung: The paper describes the investigation of the progressive erosion of an a-B:D coated test piece during 22 pulses in the SOL of TEXTOR-94. Time resolved observations by colorimetry reveal that the erosion proceeds in steps: during an intermediate phase the rates do not exceed ∼ -1.5 nm/s. Thereafter they jump to about -6 nm/s. This is due to carbon incorporation and triggered when the concentration approaches ∼ 40%. The changing composition may influence the ratio of the BII/CII emission near the surface. The process ends with a carbon rich layer on the remnants of the boron film. Combination of different investigations (AES, NRA, EPMA) results in a preliminary model description. Zurück zur Listen Ansicht