Synthesis and Properties of Al2O3 Nanocomposite Ceramics Toughened by Nano Metallic Particles
Al2O3/Ni composite ceramics toughened by metallic particles was fabricated by the vacuum reduction of Al2O3 and nickel nitrate (Ni(NO3)2•6H2O) mixed powders at 800-1000° for 2-4h and hot pressed at 1400° ~ 1500°C for 1-2h. Three-point bending strength and facture toughness of the composite were studied. With the increase of Ni content, its flexural strength and facture toughness increases significantly. Microstuctural investigations of the composite revealed that fine nickel particles dispersed homogeneously at the matrix grain boundaries, forming the intergranular nanocomposite.
Wei Pan, Jianghong Gong, Chang-Chun Ge and Jing-Feng Li
S. Gu and Z. Q. Zeng, "Synthesis and Properties of Al2O3 Nanocomposite Ceramics Toughened by Nano Metallic Particles", Key Engineering Materials, Vols. 280-283, pp. 1099-1102, 2005