Analysis of High Temperature Alloys by X-Ray Fluorescence

A Brief Overview of Metal Analysis in Alloys and Related Matrices: Some Classical Methods and Modern Spectroscopic Methods

“…Normalmente, a sensibilidade associada à fluorescência de raios X é baixa, na faixa de concentração de 0,01 a 100%, mas em casos de amostras pouco complexas, como ligas metálicas, concentrações menores que essas podem ser quantificadas (mg kg -1 ou menos). 46 Em 1953, Brissey 63 já citava a técnica como promissora para análises de ligas metálicas, mas apontava dificuldades de determinação para elementos com número atômico menor que 22 e com concentrações inferiores a 1% em massa. Com o tempo, análises rápidas de ligas como Ag-Pd, Pd-Ag e Au-Cu-Ag, puderam ser realizadas sem a necessidade de uso de padrões, através do emprego do método de parâmetros fundamentais (PF).…”

Sampling Errors in the X-Ray Fluorescent Determination of Titanium in a High Temperature Alloy

“…For convenience, the single standard method described by Brissey (1) was used. This technique requires only one reference standard, and it minimizes errors resulting from misalignment of equipment and fluctuation of operating conditions.…”

“…Normally, this assumed linear relationship is a very good approximation, especially when the composition range is small as it is in this case. Therefore, the following relationship can be used to determine the quantity of an element in an unknown: Ic (Unknown) /% of element\ _ Ic (Standard) \ in standard / % of element in unknown (1) where Ic is the intensity of the characteristic radiation of the element expressed in quanta or counts per second. Ie of Formula 1 was determined by measuring the time necessary for the proportional counter to register 65,536 quanta when the goniometer was set to receive the characteristic x-radiation.…”