High-temperature properties of a silicon nitride/boron nitride nanocomposite

Hexagonal graphitic BN (h-BN) is interesting as a second phase for high-temperature structural ceramics because it has the same crystal structure as graphite, for which fracture strength and Young's modulus increase with increased temperature. In this study, high-temperature mechanical properties of Si 3 N 4 /BN nanocomposite were evaluated to clarify the effect of fine h-BN particles at elevated temperatures. As a result, we found that high-temperature strength and hardness of the nanocomposite were maintained up to high temperatures; also, its Young's modulus increased gradually, concomitant with elevated temperatures up to 1400 °C. Finally, these properties were compared with those of monolithic Si 3 N 4 and Si 3 N 4 /BN microcomposite.

[1]  A. Tsuge,et al.  Effect of Crystallizing the Grain‐Boundary Glass Phase on the High‐Temperature Strength of Hot‐Pressed Si3N4 Containing Y2O3 , 1975 .

[2]  A. Evans,et al.  High temperature failure mechanisms in ceramics , 1980 .

[3]  Robert Ruh,et al.  High/Low Modulus Si3N4‐BN Composite for Improved Electrical and Thermal Shock Behavior , 1981 .

[4]  F. Lange.  Fabrication and properties of dense polyphase silicon nitride , 1983 .

[5]  F. Thévenot,et al.  Boron nitride effect on the thermal shock resistance of an alumina-based ceramic composite , 1986 .

[6]  W. Sinclair,et al.  Microstructure and thermal shock behaviour of BN composites , 1987 .

[7]  A. Lipp,et al.  Hexagonal boron nitride: Fabrication, properties and applications , 1989 .

[8]  K. Niihara,et al.  A superplastic covalent crystal composite , 1990, Nature.

[9]  K. Niihara,et al.  Interfaces in Si3N4-SiC nano-composite , 1990 .

[10]  R. Paine,et al.  Synthetic routes to boron nitride , 1990 .

[11]  K. Niihara.  New Design Concept of Structural Ceramics , 1991 .

[12]  I. Tanaka,et al.  Si3N4/SiC‐Whisker Composites without Sintering Aids: III, High‐Temperature Behavior , 1991 .

[13]  S. Sakaguchi,et al.  The Piosson's ratio of engineering ceramics at elevated temperature , 1991 .

[14]  R. Duclos,et al.  The effect of TiN and TiC dispersoids on the high-temperature deformation mechanisms of Si3N4 , 1992 .

[15]  M. Hubácek,et al.  A contribution to the crystallochemistry of boron nitride , 1992 .

[16]  M. Swain,et al.  Fracture toughness and thermal shock behavior of silicon nitride-boron nitride ceramics , 1992 .

[17]  Y. Yamauchi,et al.  Tensile creep and creep rupture behavior of monolithic and SiC-whisker-reinforced silicon nitride ceramics , 1993 .

[18]  S. Suresh,et al.  High‐Temperature Crack Growth in Monolithic and SiCw‐Reinforced Silicon Nitride under Static and Cyclic Loads , 1994 .

[19]  M. Gee,et al.  High temperature friction and wear testing of silicon nitride ceramics , 1995 .

[20]  R. Krause,et al.  Failure Modes of SiC‐Fiber/Si3N4‐Matrix Composites at Elevated Temperatures , 1995 .

[21]  G. Petzow,et al.  Recent Progress in Silicon Nitride and Silicon Carbide Ceramics , 1995 .

[22]  T. Hirano,et al.  Microstructure and mechanical properties of Si3N4/SiC composites , 1995 .

[23]  M. Ozawa,et al.  Fracture Energy and Microstructure of β′-Sialon-BN Composite , 1995 .

[24]  S. M. Hsu,et al.  Fracture Behavior of Multilayer Silicon Nitride/Boron Nitride Ceramics , 1996 .

[25]  T. Akatsu,et al.  The microstructure and creep deformation of hot-pressed Si_3N_4 with different amounts of sintering additives , 1996 .

[26]  T. Nishimura,et al.  High temperature strength of silicon nitride ceramics with ytterbium silicon oxynitride , 1997 .

[27]  S. Alkoy,et al.  Crystallization behavior and characterization of turbostratic boron nitride , 1997 .

[28]  K. Niihara,et al.  Microstructure and high-temperature strength of Si3N4-SiC nanocomposite , 1998 .

[29]  J. Besson,et al.  Si3N4/SiCN Nanocomposites: influence of SiC nanoprecipitates on the creep behaviour , 1998 .

[30]  Kwang-Taek Hwang,et al.  High‐Temperature Strength and Microstructural Analysis in Si3N4/20‐vol%‐SiC Nanocomposites , 1999 .

[31]  Guo‐Jun Zhang,et al.  Effect of BN content on elastic modulus and bending strength of SiC-BN in situ composites , 1999 .

[32]  S. Guo,et al.  Strength Retention in Hot-Pressed Si3N4 Ceramics with Lu2O3 Additives after Oxidation Exposure in Air at 1500°C , 2002 .

[33]  P. Šajgalík,et al.  Fracture Toughness of a Silicon Nitride/Silicon Carbide Nanocomposite at 1350°C , 2004 .

[34]  Y. Choa,et al.  Fabrication and Microstructure of Silicon Nitride/Boron Nitride Nanocomposites , 2004 .

[35]  M. Herrmann,et al.  Silicon Nitride/Silicon Carbide Nanocomposite Materials: II, Hot Strength, Creep, and Oxidation Resistance , 2005 .

[36]  R. Brook,et al.  Alumina/silicon carbide nanocomposites by hybrid polymer/powder processing: Microstructures and mechanical properties , 2005 .

[37]  Y. Choa,et al.  Strengthening and Toughening Mechanisms of Ceramic Nanocomposites , 2005 .

[38]  M. Herrmann,et al.  Silicon Nitride/Silicon Carbide Nanocomposite Materials: I, Fabrication and Mechanical Properties at Room Temperature , 2005 .