Determination of carbon in aluminum-titanium-carbon master alloy by high frequency combustion infrared absorption method
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-titaniumcarbon 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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