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Mullite-Zirconia 복합체의 미세구조와 기계적 성질에 미치는 $Al_2O_3$ 강화재 형상의 영향
박상엽 한국세라믹학회 1995 한국세라믹학회지 Vol.32 No.7
The multiply reinforced mullite-zirconia composites were prepared with addition of Al2O3 particles, platelets, and fibers. The sinter-HIP specimens (presintered at 1$700^{\circ}C$ and hipped at 1$600^{\circ}C$) showed that the fracture toughness of Al2O3 fiber reinforcement (4.4 MPa.{{{{ SQRT {m} }}) was higher than those of platelet (4.0 MPa.{{{{ SQRT {m} }}) and of particle (3.9MPa.{{{{ SQRT {m} }}) reinforcement, whereas the fracture strength of Al2O3 particle reinforcement (304 MPa) was higher than those of platelet (293MPa) and of fiber (248MPa) reinforcement.
Mullite-Zirconia 복합체의 소결거동 및 기계적 성질
박상엽 한국분말야금학회 1997 한국분말재료학회지 (KPMI) Vol.4 No.1
The mullite-zirconia composites were prepared by the pressureless sintering with addition of 10~20 vol% ZrO$_2$(TZ3Y) in the fused mullite and sol-gel mullite matrix. The densification rate of sol-gel mullite was higher than that of fused mullite, and the addition of ZrO$_2$(TZ3Y) was effective on the densification of fused mullite. The enhancement of densification and anisotropic growth of mullite in ZrO$_2$added specimen can be explained by the solid solution effect of $Zr^{+4}$ ion in mullite. Both mechanical strength and fracture toughness of mullite-zirconia composite were enhanced compared to those of mullite. The enhancement of mechanical properties is attributed to the hinderance of grain growth and the combined toughening effects of tetra-mono phase transformation and crack deflection due to the residual stress between mullite/ZrO$_2$.
박상엽,송준호 한국세라믹학회 2001 한국세라믹학회지 Vol.38 No.4
배향 입자층과 비배향 입자층이 상호적층된 알루미나 적층복합체를 연속 테입캐스팅 및 상압소결에 의해 제조하였다. 알루미나의 미세구조 배향을 위하여 알루미나 판상입자를 배향물질(template)로 사용하였으며, 알루미나의 입자배향 거동에 미치는 액상의 영향을 알아보기 위해 anorthite(CaAl$_2$Si$_4$O$_{8}$)를 첨가하였다. 적층체 내의 알루미나 입자배향을 X-선 회절법으로 분석한 결과 (006)면과 (1010)면으로 배향되어 있었다. 액상조성이 첨가되지 않은 경우와 비교시 anorthite를 첨가한 경우 입자배향층 내에는 액상으로 인한 큰 기공이 생성되었으며 배향도는 감소되었다. 그러나, 액상조성으로 anorthite가 첨가되어 입자배향이 이루어진 적층체 계면에서는 입자배향으로 인한 효과적인 균열전파 제어 거동이 관찰되었다.
박상엽,백용균,강석중 대한금속재료학회(대한금속학회) 1987 대한금속·재료학회지 Vol.25 No.3
Liquid-grain mixture flow for the elimination of isolated pores during liquid phase sintering has been studied. Isolated pores have been created in various Mo-Ni alloys by embedding 3 wt % of spherical Ni particles of 100㎛ diameter in fine Mo-Ni powder compacts. The total Ni content has been varied from 4 to 10 wt %. In the specimens with lower liquid content (=8 vol %), the skeleton of 9 grains around pores remains intact and the pores are mainly filled by liquid, producing liquid pockets at the pore sites. With increasing the liquid content, the dominant mechanism operating for the elimination of large pores becomes liquid-grain mixture (low into pores, forming liquid-grain mixture pockets. Effect of initial Mo powder size on the pore elimination processes is also discussed.