Determination of Microamount of Carbon in Titanium Sponge by High Frequency Combustion

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  • 高周波燃焼法によるスポンジチタン中の微量炭素の定量
  • コウシュウハ ネンショウホウ ニ ヨル スポンジ チタン チュウ ノ ビリョウ タンソ ノ テイリョウ

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Abstract

When titanium is heated by high frequency field in oxygen stream, titanium is burned explosively without use of flux, but the crucicle is eroded by the sudden rise of temperature, and the operation cannot be continned. In order to avoid such erosion, investigations were made on material and shape of the crucible, and condition of combustion. A crucible made of material containing Al2O3 and SiO2 in the ratio of 10:8 was used. Chips of the crucible were added to the center of the sample. After covoering up, the sample was preheated for 40∼60 seconds without oxygen flow just before the burning. The sample coule be burned completely without any erosion or damage to the crucible. The generated CO2 was frozen out with liquid oxygen and then was evaporated into a McLeod gauge, and the pressure was measured. The accuracy of the method was ±0.00021% and the reproducibility was ±0.00053% in standard deviation. Time reqired was about 16 minutes per sample.

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