Effect of geometrical factors on the mechanical properties of Si3N4/BN multilayer ceramics

• Published in: Ceramics international Vol. 30; no. 3; pp. 441 - 446
• Main Authors: QINGFENG ZAN, WANG, Chang-An, YONG HUANG, SHIKE ZHAO, CUIWEI LI
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Science 2004
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Cermets, ceramic and refractory composites; Chemical industry and chemicals; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Other materials; Physics; Specific materials; Structural ceramics; Technical ceramics; Ceramic matrix composite; Stratified material; Mechanical model; Mechanical properties; Experimental study; Boron Nitrides; Composite material; Non oxide ceramics; Structural ceramic; Fracture toughness; Bending strength; Silicon Nitrides; Manufacturing; Geometrical factor
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/S0272-8842(03)00129-9

The relationships between mechanical properties of Si3N4/BN multilayer materials and the geometrical factors, number of layers (N) and layer thickness ratio (lambda(h)), were studied. At a given number of layers, with the increase of layer thickness ratio, the toughness and bending strength both increased, and when it continued to increase, the two curves both levelled off. Keeping the layer thickness ratio of about 10 and increasing the number of layers, the bending strength decreased slightly, and a maximum toughness was obtained at N about 30. A mechanical model was established and used to analyse the results. Suitable geometrical parameters were advised in the design of Si3N4/BN multilayer materials as lambda(h) about 10 and N about 30. 9 refs.