THERMAL-PROPERTIES OF A FE75CR5P8C10SI2 METAL-METALLOID GLASSY ALLOY IN AIR ATMOSPHERE - THE GLASS-SURFACE MODIFICATION IN RELATION TO ITS THERMAL PRETREATMENT

Ribbons of metal-metalloid glassy alloys (Fe,Cr)(80)(P,C,Si)(20) and F e75Cr5P8C10Si2, respectively, were thermally treated at 480, 500 and 5 30 degrees C. After this oxidative glass treatment, the surface layer was characterized by ESCA. Only slight changes in the concentration of the elements as a function of treatment temperature and rime could be observed. The contents in oxygen, chromium and manganese (which exist s as a trace element) rose weakly and contrarily the concentration of carbon and iron decreased. The results of the combined DTA-TG measurem ents of the glass sample in air showed negligible weight changes of th e sample up to about 550 to 600 degrees C. The difference in the surfa ce roughness between thermally treated and untreated samples could not be detected by scanning electron microscopy.