TY - JOUR
T1 - Fabrication and microstructure of silicon nitride/boron nitride nanocomposites
AU - Kusunose, Takafumi
AU - Sekino, Tohru
AU - Choa, Yong Ho
AU - Niihara, Koichi
PY - 2002/11
Y1 - 2002/11
N2 - A chemical process for fabrication of Si3N4/BN nanocomposite was devised to improve the mechanical properties. Si3N4/BN nanocomposites containing 0 to 30 vol% hexagonal BN (h-BN) were successfully fabricated by hot-pressing α-Si3N4 powders, on which turbostratic BN (t-BN) with a disordered layer structure was partly coated. The t-BN coating on α-Si3N4 particles was prepared by reducing and heating α-Si3N4 particles covered with a mixture of boric acid and urea. TEM observations of this nanocomposite revealed that the nanosized hexagonal BN (h-BN) particles were homogeneously dispersed within Si3N4 grains as well as at grain boundaries. As expected from the rules of composites, Young's modulus of both micro- and nanocomposites decreased with an increase in h-BN content, while the fracture strength of the nanocomposites prepared in this work was significantly improved, compared with the conventional microcomposites.
AB - A chemical process for fabrication of Si3N4/BN nanocomposite was devised to improve the mechanical properties. Si3N4/BN nanocomposites containing 0 to 30 vol% hexagonal BN (h-BN) were successfully fabricated by hot-pressing α-Si3N4 powders, on which turbostratic BN (t-BN) with a disordered layer structure was partly coated. The t-BN coating on α-Si3N4 particles was prepared by reducing and heating α-Si3N4 particles covered with a mixture of boric acid and urea. TEM observations of this nanocomposite revealed that the nanosized hexagonal BN (h-BN) particles were homogeneously dispersed within Si3N4 grains as well as at grain boundaries. As expected from the rules of composites, Young's modulus of both micro- and nanocomposites decreased with an increase in h-BN content, while the fracture strength of the nanocomposites prepared in this work was significantly improved, compared with the conventional microcomposites.
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U2 - 10.1111/j.1151-2916.2002.tb00514.x
DO - 10.1111/j.1151-2916.2002.tb00514.x
M3 - Article
AN - SCOPUS:0036863613
VL - 85
SP - 2678
EP - 2688
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
IS - 11
ER -