Research Progress in Determination of Oxygen and Nitrogen in Metals and Ceramic Materials by Pulse Fusion Method

Pulse fusion method had been widely used for determination of oxygen and nitrogen in metals and ceramics. However, few researches were reported on relevant equipments in China. In the actual analysis, the optimal parameters were mainly obtained according to the conditional tests, the accuracy was ensured relying on the standard addition recovery, and necessary theoretical researches and auxiliary methods for verifying the test results was lacking. The relevant researches abroad were relatively wealthy, and there were many highlights in the application of equipments, theoretical research and auxiliary methods. Based on those, equipment improvements, especially for detection system and pneumatic system, the application progress of graphite crucibles and effect of crucible difference on the determination were systematically introduced. The research work abroad on ultra-low oxygen in steel, activated metal analysis, and oxygen and nitrogen analysis in ceramic materials were also introduced, which were compared with the domestic related work. It was concluded that reliable comparison tests could help to find the problems existing in traditional methods, and theoretical research could fundamentally explain the observed testing phenomena (78 ref. cited).