スピネル/マイカ複合体の微構造及び機械的性質に及ぼすフッ素フロゴパイト組成ガラス添加量の影響

抄録

Spinel/mica composites were fabricated by sintering powder compacts containing 5, 10, 20, 50 and 80mass% fluorophlogopite-composition (Fph: KMg₃AlSi₃O₁₀F₂) glass and spinel (MgAl₂O₄). Mica precipitated in all the composites. For composites containing 5 and 10% glass, the maximal densification was achieved at 1400°C. A spinel skeleton was formed and fine mica crystals precipitated among spinel grains. For composites containing 20% glass, the maximal densification was achieved at 1300°C. Thick mica platelets precipitated among the spinel grains. For composites containing 50 and 80% glass, a porous house-of-cards structure, which consists of plate-like mica crystals, was formed. Flexure strength and Vickers hardness were measured.