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직접질화법에 의한 (Ti , Al)N계 복합질화물의 합성 (2)
조영수 ( Young Soo Cho ),이영기 ( Young Ki Lee ),손용운 ( Yong Un Sohn ),박경호 ( Kyong Ho Park ),김석윤 ( Seok Yoon Kim ) 한국열처리공학회 1996 熱處理工學會誌 Vol.9 No.3
The purpose of this research is to develop the technology for the synthesis of (Ti, Al)N powder, which shows simultaneously the excellent properties of TiN and AlN, from the Ti-Al intermetallic compounds by the direct nitriding method. The effects of variables such as temperature, Ti-Al intermetallic compounds (TiAl₃, TiAl and Ti₃Al) were investigated by TG, XRD and SEM. The (Ti, Al)N powder can be easily synthesized from the intermetallic compounds by the direct nitriding method. Among the intermetallic compounds, the nitriding behavior increased with TiAl>Ti₃Al>TiAl₃, as the difference of diffusion coefficient for nitrogen in each materials. The ternary nitride such as Ti₂AlN and Ti₃Al₂N₂ can be synthesized by the direct nitriding method, although the ternary nitride coexist with TiN and AlN. The ternary nitrides are stable below 1400℃, but these are gradually decomposed into TiN and AlN above 1400℃.
직접질화법에 의한 (Ti , Al)N계 복합질화물의 합성 (1)
손용운,이영기,황연,조영수,김석윤 ( Yong Un Sohn,Young Ki Lee,Yeon Hwang,Young Soo Cho,Suk Yoon Kim ) 한국열처리공학회 1995 熱處理工學會誌 Vol.8 No.3
TiN and AlN are ceramic materials with mechanical and chemical properties for use in structural applications at elevated temperature. The purpose of this research is to develop the technology for the synthesis of (Ti. Al)N power, which shows simultancously the excellent properties of TiN and AlN, from the mixed powder(Ti_(0.25) Al_(0.75), Ti_(0.5) Al_(0.5) and Ti_(0.75) Al_(0.25)) by the direct nitriding method. The effects of variables such as temperature, mixing ratio of Al to Ti in raw material were investigated. The(Ti, Al)N powder can be easily synthesized from the mixed powder by the direct nitriding method. Among the mixed powdres, the rutriding behavior decreased with increasing the ratio of Al to Ti. This behavior is well explained by the nitriding mechanism presented in this research.
이영기,손용운,조영수,김용석,김석윤 ( Young Ki Lee,Yong Un Sohn,Young Soo Cho,Yong Seog Kim,Suk Yoon Kim ) 한국열처리공학회 1995 熱處理工學會誌 Vol.8 No.2
The nitridation kinetics of titanium powder were studied by isothermal and non-isothermal (dynamic) methods in high purity nitrogen under 1 atm pressure. For the comparison with nitridation, the oxidation kinetics of titanium powder were also studied in dry oxygen at 1 atm pressure. An automatic recording electrobalance was used to measure the weight gain as a function of time and temperature. For the reaction with nitrogen, the nitride was formed at over 700℃. The reaction with nitrogen followed the parabolic rate law, and the activation energy was calculated to be 31 ㎉/㏖ in the isothermal method (above 900℃). The non-stoichiometric TiNx has been synthesized by the nitridation at a proper temperature and time, followed by the homogenizing treatment above 1100℃. In comparison with the stoichiometric TiN_(1.0) and the non-stoichiometric TiNx(TiN_(0.5) and TiN_(0.65)), the hot oxidation characteristics of the former is superior to that of the latter. However, both non-stoichiometric nitrides make little difference in the hot oxidation characteristics.