1. Dalian University of Technology Materials Central Laboratory, Dalian 116023, China; 2. Research Institute of Photonics, Dalian Polytechnic University, Dalian 116034, China
Abstract：0.2 g of pure iron fluxing agent was put into the treated crucible. Then, 0.2 g of sample was added and covered by 1.3 g of tungsten particles and 0.2 g of tin particles. The combustion time was set at 35 s. Thus,a determination method of carbon in aluminum-titanium-carbon master alloy was established by high frequency combustion infrared absorption method after fusion with ternary flux. The results showed that the average blank value of the proposed method was w(C)=0.000 8% (n=5), which could be ignored compared with the mass fraction of carbon ranged from 0.10% to 0.30% in aluminum-titanium-carbon master alloy. The proposed method was applied to determination of carbon in actual sample of aluminum-titanium-carbon master alloy. The results were consistent with those obtained by tube furnace combustion-alkali asbestos absorption gravimetric method. The relative standard deviations (RSD, n=10) were between 0.54% and 0.71%. The recoveries of standard addition were between 98% and 101%. This method was applicable for determination of the carbon mass fraction in range of 0.10%-0.30%.
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