【摘要】 研究了莫来石-氧化锆复合陶瓷。用湿化学法制备的纯荚来石其常温抗弯强度和断裂韧性较低,σ_f=236MPa,K_Ic=2.5MPa·m^1/2,而莫来石-氧化锆复合陶瓷的常温强度和韧性大大提高,σ_f=612 MPa,K_Ic=5.1MPa·m^1/2。研究结果表明:氧化锆的强韧化机理是微应力场作用、应力诱导相变增韧及第二相粒子强化。更多还原

【Abstract】 Mullite-zirconia composites are studied in the paper. Lower bending strength （σ₁=236MPa） and fracture toughness (K_1c=2.5MPa·m^1/2) of pure mullite prepared by wet-chemical method are found. But for mullite-zirconia composite, σ₁ （612MPa） and K₁₀. (5.1MPa·m^1/2) have been increased greatly. The mechanism of strengthening and toughening by zirconia are thought to be the effect of micro-stress field, zirconia transformation toughening, and the second phase particles dispersion strengthening.更多还原