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무가압침투법에 의한 전자패키징 재료용 Al / SiCp 복합재료의 제조
최일동,김성준,박익민 ( Il Dong Choi,Sung Joon Kim,Ik Min Park ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.1
N/A Infiltration behavior of Al-Mg alloys in SiC_p powder bed using pressureless infiltration technique have been studied. The manufacturing of Al/SiC_p composites by pressureless infiltration was successful when Mg was added over 8% in Al alloy matrix. Processing time and temperature to complete Infiltration through SiC_p bed was decreased with increasing Mg content in Al alloy. When Mg powder was added in SiC_p bed, processing temperature for successful infiltration was decreased. Volume fraction of SiC_p in composites was increased with increasing the mixing ratio of coarse SiC particles.
반응 용탕단조한 (Al2O3 SiO2+Ni) / Al 하이브리드 금속복합재료의 제조 및 특성
김상석,박익민,김성준,최일동 ( Sang Suk Kim,Ik Min Park,Sung Joon Kim,Il Dong Choi ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.4
N/A Mechanical properties of (10%Al₂O₃·SiO₂+5%Ni)/Al hybrid composites fabricated by the reaction squeeze casting were compared with those of (15%Al₂O₃·SiO₂)/Al composites. Al-Ni intertmetallic compounds (10-20㎛) formed by the reaction between nickel powder and molten aluminum were uniformly distributed in the Al matrix. These intermetallic compounds were identified as Al₃Ni using X-ray diffraction analysis and they resulted in beneficial effects on room and high temperature strength and wear resistance. Microhardness values of (10%Al₂O₃·SiO₂+5%Ni)/Al hybrid composite were greater by about 100Hv than those of (15%Al₂O₃·SiO₂)/Al composite. Wear resistance of (10%Al₂O₃·SiO₂+5%Ni)/Al hybrid composites was superior to that of (15%Al₂O₃·SiO₂)/Al composites regardless of the applied load. While tensile and yield strength of (10Al₂O₃·SiO₂+5%Ni)/Al hybrid composites were greater at room temperature and 300℃, strength drop at high temperature was much smaller in hybrid composites.
반응용탕단조법에 의한 (Al2O3+Si)/Mg 하이브리드 금속복합재료의 제조 및 특성평가
오동현 ( Dong Hyun Oh ),전상혁 ( Sang Hyuk Jeon ),박익민 ( Ik Min Park ),조경목 ( Kyung Mox Cho ),최일동 ( Il Dong Choi ) 한국주조공학회 2000 한국주조공학회지 Vol.20 No.1
In the present study, (10%Al2O3+5%Si)/AZ91 Mg hybrid composite was fabricated using the squeeze casting method. During squeeze casting, molten Mg was infiltrated into the preform of 10%Al2O3+5%Si and reaction product of Mg2Si intermetallic compound was formed by the reaction between molten Mg and Si powder. Microstmcture has been observed and mechanical properties were evaluated for the reaction squeeze cast (RSC) hybrid composite. It was found that Si powder totally reacted with molten Mg to form Mg2Si. Reinforcement (Al2O3) and the reaction product (Mg2Si) are fairly uniformly distributed in Mg matrix for the squeeze cast hybrid composite. Mechanical properties were improved with hybridization of reinforcements, namely higher hardness and enhanced wear resistance comparing squeeze cast (l5%A2lO3)/AZ91 Mg composite.
조경목,박익민,최일동,송대현,최홍석 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.6
In the present study, Al-SiC_p FGMs containing 10 layers with different volume fraction of Al and SiC_p, and different geometry in thickness (3 ㎜, 5 ㎜ and 7 ㎜) were fabricated by employing the pressureless infiltration technique. Optimum condition was established to obtain the enough strength of preforms by controlling the forming pressure and binder added. Al-10%Mg was properly infiltrated into the preforms at 920℃ with N₂ atmosphere within a tube furnace. Analysis of microstructure and mechanical properties revealed that Al-SiC_p FGMs were fabricated successfully. Curvature of Al-SiC_p FGMs plates was measured to predict the internal stress distribution via a theoretical model for the analysis of thermo-mechanical deformation.