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Internal friction and torsional creep behavior of chemically vapor deposited boron nitride

Published online by Cambridge University Press:  31 January 2011

Giuseppe Pezzotti ,
Hans-Joachim Kleebe ,
Ken'ichi Ota  and
Toshihiko Nishida
Giuseppe Pezzotti
Affiliation:
Department of Materials, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, 606 Kyoto, Japan
Hans-Joachim Kleebe
Affiliation:
Institut für Materialforschung, Universität Bayreuth, D-95440 Bayreuth, Germany
Ken'ichi Ota
Affiliation:
Institute of Scientific and Industrial Research, Osaka University, Ibaraki-shi, Mihogaoka 8–1, 561 Osaka, Japan
Toshihiko Nishida
Affiliation:
Department of Materials, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, 606 Kyoto, Japan
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Abstract

Dense hexagonal BN processed via chemical vapor deposition (CVD) was tested with respect to damping, shear modulus, and torsional creep rate up to temperatures as high as ≈2300 °C. The microstructural characteristics of the material both before and after creep testing were studied by high-resolution electron microscopy (HREM). The CVD process yields a homogeneous nanosized microstructure with no other secondary phase detectable. Damping experiments revealed no plastic relaxation during testing up to ≈2000 °C, which is consistent with the fact that also no creep deformation could be detected below such a high temperature. Small porosity and an increased amorphization process were noted by HREM inspection after stress exposure at ≈2300 °C. These phenomena may be responsible for both the enhanced damping capacity and the creep rate of the material which, in the range of the present testing conditions, seems to follow the simple viscoelastic behavior of a Maxwell solid.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 12 , December 1998 , pp. 3453 - 3457
Copyright
Copyright © Materials Research Society 1998

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