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Diamond film was synthesized on molybdenum substrate by chemical reaction of liquid organic compounds and hydrogen gas using the plasma jet at atmospheric pressure. The morphology of film deposited is cube (100) faces at the position of 6 mm away from the film center regardless of a kind of organic compound. When the toluene has been used as a precursor, a sharp diamond peak is observed at 1332 cm^(-1) with the temperature condition of 970℃, FWHM of 1332 cm^(-1) peak is on order of 5.9 cm^(-1). The presence of non-diamond carbon phase has been detected at the temperature of 1150℃.
The decomposition of carbon dioxide has been investigated using thermal plasma. Carbon dioxide is decomposed in the thermal plasma process of high temperature and converted to another materials in the quenching process. From the thermodynamic equilibrium calculations, it is known that carbon dioxide is decomposed over 2,500K at atmospheric pressure and carbon dioxide is reacted with hydrogen, methane or water to be converted to other material over 1,200K at atmospheric pressure. When carbon dioxide is decomposed directly, the decomposition efficiency is very low because of recombination into carbon dioxide during the quenching step. However when carbon dioxide is reacted with hydrogen, methane or water to be decomposed, the decomposition efficiency is very high because carbon dioxide is decomposed to be converted into carbon monoxide and hydrogen during the quenching step.
Diamond was synthesized on molybdenum substrate by chemical reaction of methane and hydrogen gas using the DC plasma jet at atmospheric pressure. The most important factors of diamond synthesis are the ratio of methane to hydrogen flow rates and the surface temperature of substrate. Experiments were carried out by changing the CH₄/H₂ ratios from 1% to 7% and diamond was well synthesized when the surface temperature of substrate was 970℃. The substrate temperature was measured by optical pyrometer.
Diamond film was synthesized on molybdenum substrate by chemical reaction of volatile organic compounds and hydrogen gas using the plasma jet at atmospheric pressure. The morphology of film deposited is (111) faces at 1.5㎖/min of toluene and (100) faces at 1.5m/min of dichlorobenzene. The presence of non-diamond carbon phase has been detected at the temperature of 1050℃.
It is well known that thermal plasma process has unique characteristics of high temperature, high activity and rapid quenching. Also, This process has the advantage of synthesis of high quality ultra-fine titanium oxide. the powders collected on different positions were analyzed by XRD, SEM, TEM, particle size analyzer. The particle size of powder producing with ultra-fine decreased as feeding rate of TiCl₄.