Development on oxygen element series certified reference material of samarium-cobalt alloy and discussion on traceability of calibration value
At present,oxygen element in various samples is determined by pulse fusion infrared absorption method.The lack of certified reference materials(CRMs)with consistent matrix for curve correction is an urgent problem for daily detection and the development process of CRMs.This paper mainly focused on the issue of traceability of calibration methods in the calibration process of samarium-cobalt alloy series CRMs.The influence of different calibration methods on the consistency of calibration results was verified to ensure the accuracy of calibration values for series CRMs.The influence of fusion temperature on the degree of oxygen release in powder and bulk samarium-cobalt alloy samples,titanium alloy CRMs,and copper alloy CRMs was investigated.The results showed that the traceability of the calibration results could be guaranteed when the instrument power was above 4.4 kW and the fusion temperature was above 1 200 ℃.The traceability test was conducted by primary reagent method,and the results were satisfacto-ry.The developed CRMs were determined by primary reagent method and neutron activation method,as well as pulse fusion infrared absorption method in industrial standard of XB/T 610.3-2015,respectively.It was found that the consistency of three methods could meet the requirements for CRMs calibration.On the basis of investigating the uniformity and stability of CRMs,the standard values and expanded uncertainties of series CRMs were determined respectively by primary reagent method,neutron activation method,and pulse fusion infrared absorption method in industry standard of XB/T 610.3-2015 as the calibration meth-ods through the collaboration of multiple laboratories.This paper provided a physical guarantee for deter-mination of oxygen element in samarium-cobalt alloy and also provided a reference for the development of oxygen element CRM for other types that had no similar CRMs as calibration value traceability.
samarium-cobalt alloycertified reference material of oxygendevelopment of certified reference materialtraceability of calibration valueprimary reagent methodneutron activation methodpulse fusion infrared absorption method
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