COMPARISON OF VARIOUS CALIBRATION TECHNIQUES FOR THE DIRECT SPECTROSCOPICAL ANALYSIS OF SIC POWDERS

Techniques for the direct analysis of powdered advanced ceramics provi de an advantageous alternative to methods using wet digestion in sampl e preparation. The direct spectrochemical methods based on electrother mal vaporization (ETV-ICP-OES, solid-ETV-AAS, etc.) show a great simil arity to the classical method of d. c. are excitation. The calibration procedure is the major difficulty of all techniques applied for direc t solid sample analysis, as there is a lack of suitable reference mate rials of ceramics. Consequently, it was necessary to verify various po ssibilities of preparation and application of model calibration sample s. The results of such a calibration are compared with those using wit hin-laboratory standards.