材料科学
独居石
复合材料
微观结构
微晶
扫描电子显微镜
热压
涂层
纤维
浸涂
冶金
古生物学
生物
锆石
作者
K. K. Chawla,H. Liu,Jolanta Janczak‐Rusch,Sankar Sambasivan
标识
DOI:10.1016/s0955-2219(99)00253-8
摘要
The objective of this research was to engineer a weak interfacial bond in single crystal α-alumina (Saphikon) fiber/polycrystalline alumina matrix composites by incorporating a monazite (lanthanum phosphate, LaPO4) coating onto Saphikon fibers via sol–gel dip process. Uniaxial hot pressing was used to densify LaPO4-coated Al2O3 fiber in an Al2O3 matrix composites. Characterization of the composites was done by optical microscopy, SEM (scanning electron microscopy), EDS (energy dispersive spectrometer), indentation tests, three-point bend and fiber pushout tests. The results showed that the Saphikon fiber/monazite interface was weaker than the polycrystalline alumina/monazite interface. Crack deflection, interfacial debonding and fiber pullout occurred at this interface. This was attributed to the fact that the Saphikon fiber/monazite interface was smoother than the monazite/polycrystalline alumina matrix interface. Monazite coating obtained by sol–gel dip coating method withstood high fabrication temperatures (1400°C) and was conducive to the toughness properties of the composites.
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