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박동화,오성민,공정구 한국공업화학회 1999 응용화학 Vol.3 No.1
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.
박동화,오성민 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.2
열플라스마에 의해 알루미늄 덩어리를 증발시켜 질화알루미늄 초미립자를 합성하였다. 열플리즈마에 의해 해리된 질소원자 또는 질소 분자가 급속히 용융 알루미늄 속으로 용해되고, 과포화된 질소는 다량의 알루미늄 증가를 동반하여 외부로 방출하게 된다. 이때 증발된 알루미늄과 반응가스와의 반응에 의하여 질화알루미늄이 합성된다. 반응가스로서 질소와 암모니아를 온도가 다른 여러 위치에서 주입시켜 전환율을 비교하였다. 암모니아를 저온영역에 주입시킬 때 반응률이 향상되었고, 이러한 원인은 질화알루미늄의 생성자유에너지를 근거로 하여 해석되었다. 합성된 분말은 평균 30㎚의 균일한 입경을 갖는 질화알루미늄 초미립자로 관찰되었다. Ultrafine powders of aluminium nitride were synthesized by evaporating Al bulk in thermal plasma. Atomic nitrogen dissociated and molecular nitrogen activated in thermal plasma are dissolved quickly in molten Al, subsequently super-saturated nitrogen is evolved with Al vapor. Then AlN powders were synthesized by the reaction of Al vapor and atmospheric reactant gas. The reactant gases of N₂ and NH₃ were injected in different temperature regions in order to compare the conversion of Al into AlN. It was observed that when ammonia gas was injected in low temperature region, reactivity was increased and this result was demonstrated by Gibbs' free energy of AlN formation. Synthesized powders were well distributed ultrafine powders of AlN with mean diameter of 30㎚.
오성민,공정구,박동화 한국공업화학회 1998 응용화학 Vol.2 No.2
Thermal plasma jet has been used to demonstrate the capability of synthesis of high quality ultra-fine titanium dioxide. Characteristics of the powder synthesized have been observed with XRD, SEM, TEM, Particle size analyzer. The powders produced in plasma jet were mostly anatase type with nano-sized and white-colored. The powders were changed to rutile completely at 1000℃.