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$\beta-Sialon/SiC$ Whisker 복합재료의 기계적 물성 및 마찰 마모 특성 연구
김호균,소유영,김인섭,이병하 한국세라믹학회 1994 한국세라믹학회지 Vol.31 No.11
$\beta$-Sialon has been regarded as one of promising materials showing high strength, fracture toughness, corrosion resistence and wear resistence. The improvement of the fracture toughness and tribological properties of $\beta$-Sialon (Z=1) has been attempeted by fabricating the $\beta$-Sialon/ SiC whisker composite. Each of green body composed of following ingredients, i.e., Si3N4, AlN, Y2O3 nd SiC, respectively, was first fired at 178$0^{\circ}C$ for 3hrs in N2 atmosphere and then post-HIPed at 173$0^{\circ}C$ for 1 hr under 170 MPa for N2 gas pressure. The fracture toughness, flexural strength and tribological properties increased with increasing SiC whisker content, despite the reduction of the relative density and hardness. $\beta$-Sialon/15 vol% SiC whisker showed a significant enhancement of wear resistance compared to the monolithic $\beta$-Sialon. The addition of SiC whisker caused the reduction of the density and hardness, but induced the increment of wear resistance.
Kaolin을 이용한 Mullite 합성에 미치는 광화제 첨가 효과
임병수,강경인,소유영,박성,이병하,Lim, Byung-Soo,Kang, Kyong-In,So, You-Young,Park, Sung,Lee, Byung-Ha 한국세라믹학회 1999 한국세라믹학회지 Vol.36 No.1
본 연구에서는 fine ceramics의 합성법을 traditional ceramics 합성에 적용하여 합성한 내화재료용 mullite에 광화제를 첨가함으로서 광화제가 mullite 생성에 미치는 영향을 관찰하고자 한다. 출발물질로 하동 kaolin과 boehmite를 사용하였으며, 여기에 광화제로 MnO와 TiO2를 액상으로 첨가하였다. 그 결과 3.5 wt% MnO를 첨가한 경우, 1,25$0^{\circ}C$에서 미반응 silica와 alumina가 존재하지 않는 단일상의 mullite를 합성할 수 있었으며, TiO2 첨가시 2~3.5wt% MnO의 경우 mullite 생성 온도를 약 10$0^{\circ}C$ 낮출 수 있었다. 이때의 mullite 생성율은 1$650^{\circ}C$에서 84%이며, 부피 비중과 흡수율 및 상온에서 꺾임강도는 각각 2.72, 0.27%, 180MPa을 나타내어 광화제를 첨가하지 않은 경우보다 특성도 향상함을 알 수 있었다. In this study, the formation of mullite phase with mineralizer have been investiagated Hadong Kaolin and boehmite were used as starting materials and also of TiCl4 and MnCl4 aquous solution were used as a mineralizer. In the addition of 3.5% MnO as a mineralizer, mullite single phase could be obtained at 125$0^{\circ}C$ without any other second phases. However in the addition of TiO2 as a mineralizer, mullite single phase is obtained at above 135$0^{\circ}C$. Therefore the formation of mullite is lowered in the case of MnO as a mineralizer than of TiO2. Because it is easy to obtain mullite single phase in the case of MnO addition, all the characteristics improved. The values of bulk density, water absorption and bending strength at room temperature were 2.72g/㎤, 0.27% and 180 MPa, respectively.
Kaolin으로부터 Seed 첨가법에 의한 Mullite 합성
김인섭,박주석,이명웅,이병하,소유영 한국세라믹학회 1998 한국세라믹학회지 Vol.35 No.8
Synthesis of high purity mullite from korean resourceful kaolin and water-soluble aluminium salts was in-vestigated by addition of mullite seed. Single phase of mullite was formed at 1350$^{\circ}C$ however its mullite con-tent was 31-33% Maximum content of mullite synthesized from kaoin aluminium nitrate and 8wt% mul-lite seed was 98% at 1600$^{\circ}C$ for 4 hours.