【摘要】 通过添加粒径为50～80nm的TiN，改善了Al₂O₃-TiC复合陶瓷的力学性能。以15％（质量分数，下同）的TiN取代15％TiC，制备了纳来TiN改性Al₂O₃-TiC复合陶瓷。结果表明：70％Al₂O₃-15％TiC-15％TiN复合陶瓷的抗弯强度和断裂韧性分别为618 MPa和7.12 MPa·m^1／2，比70％Al₂O₃-30％TiC的性能(567 MPa和4.96 MPa·m_1／2)明显提高，特别是断裂韧性提高了64％。纳米TiN改性Al₂O₃-TiC复合陶瓷韧性的提高主要是由于材料致密度的提高和晶粒的细化所致，它的增韧方式为微裂纹、裂纹桥接和偏转。更多还原

【Abstract】 By adding nano-TiN with the particle size of 50—80 nm, the mechanical properties of nano-TiN modified Al₂O₃-TiC composite ceramic were improved. The nano-TiN modified Al₂O₃- TiC composite ceramic by substituting 15% （in mass, the same below） TiN for TiC was fabricated. The results show that the bending strength and fracture toughness of 70% Al₂O₃-15%TiC- 15% TiN composite ceramic are 618 MPa and 7.12 MPa · m^1/2 , which are obviously increased compared to 70% Al₂O₃-30%TiC composite ceramic (567 MPa and 4.96 MPa · m^1/2. Particularly the fracture toughness is increased by 64%. The main reasons for the increase of the toughness of nano-TiN modified Al₂O₃-TiC composite ceramic are due to the increase of density and fine crystalline particles of the material. Its toughening mode is micro-crack, crack deflection and bridge.更多还原