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안석환,정상철,남기우 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.9
Weibull statistical analysis on mechanical properties was performed on silicon carbide by immersion in acidic and alkalinesolution. The heat treatment was carried out on 1373 K. The corrosion of silicon carbide was conducted in acidic and alkalinesolution under KSL1607. Results showed that heat treatment in air could significantly increase the strength of the siliconcarbide. The strength of the corroded and cracked specimen was similar to that of the cracked specimen. The bending strengthof the corroded, crack healed specimen decreased 47% and 75% more than that of the crack healed specimen in acidic andalkaline solution, respectively. The corrosion of silicon carbide is faster in alkaline solution than in acidic solution. Theprobability distributions of Vickers hardness closely followed the Weibull distribution. The scale parameter and shapeparameter are evaluated in as-received silicon carbide and corroded silicon carbide, respectively.
SiO<sub>2</sub> 나노 콜로이드 량이 다른 Si<sub>3</sub>N<sub>4</sub>의 열처리에 따른 마모 특성
안석환,남기우,Ahn, Seok Hwan,Nam, Ki Woo 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.10
본 연구는 균열 치유 물질로 알려진 $SiO_2$ 나노 콜로이드의 첨가량을 달리한 $Si_3N_4$를 소결하여, 경면 연마한 시험편 표면에 $SiO_2$ 나노 콜로이드를 코팅하여 1273 K, 공기중에서 1시간 균열치유 처리하였다. 그 후, 마모시험편은 1073, 1273 및 1573 K에서 10분간 열처리하여 시험을 실시하였다. $SiO_2$ 나노 콜로이드를 코팅하여 열처리한 표면은 무코팅 표면보다 약간 거칠게 나타났으며, 열처리 온도에 따라 표면의 산화 정도는 조도와 뚜렷한 상관관계는 가지지 않았다. 그리고 마찰계수, 마모손실 및 굽힘강도는 표면 거칠기와 관계가 없었다. SKD11 상대재에 대하여 연삭마모의 거동을 보였으며, 마찰계수와 마모손실은 비례하였다. 또한, 강도가 클수록 마찰계수가 작고, 마모손실도 작았다. $SiO_2$ 나노 콜로이드 량의 증가에 따라서 마찰계수는 증가하다가 일정하게 되었지만, 마모손실은 증가하였다. 또한 열처리 온도가 증가함에 따라서 마찰계수는 약간 증가하는 경향을 나타내었다. This study sintered $Si_3N_4$ with different amounts of $SiO_2$ nano-colloid. The surface of a mirror-polished specimen was coated with $SiO_2$ nano-colloid, and cracks were healed when the specimen was treated at a temperature of 1273 K for 1 h in air. Wear specimen experiments were conducted after heat treatments for 10 min at 1073, 1273, and 1573 K. The heat-treated surface that was coated with the $SiO_2$ nano-colloid was slightly rougher than the noncoated surface. The oxidation state of the surface according to the heat treatment temperature showed no correlation with the surface roughness. Moreover, the friction coefficient, wear loss, and bending strength were not related to the surface roughness. $Si_3N_4$ exhibited an abrasive wear behavior when SKD11 was used as an opponent material. The friction coefficient was proportional to the wear loss, and the bending strength was inversely proportional to the friction coefficient and wear loss. The friction coefficient and wear loss increased with increasing amounts of the $SiO_2$ nanocolloid. In addition, the friction coefficient was slightly increased by increasing the heat treatment temperature.