caa a22 4500 388019441 CHVBK 20180307124920.0 cr unu---uuuuu 161130e199812 xx s 000 0 eng 10.1557/JMR.1998.0470 doi S0884291400046847 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0470 Internal friction and torsional creep behavior of chemically vapor deposited boron nitride [Elektronische Daten] 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. Copyright © Materials Research Society 1998 Pezzotti Giuseppe Department of Materials, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, 606 Kyoto, Japan Kleebe Hans-Joachim Institut für Materialforschung, Universität Bayreuth, D-95440 Bayreuth, Germany Ota Ken'ichi Institute of Scientific and Industrial Research, Osaka University, Ibaraki-shi, Mihogaoka 8-1, 561 Osaka, Japan Nishida Toshihiko Department of Materials, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, 606 Kyoto, Japan Journal of Materials Research Cambridge University Press 13/12(1998-12), 3453-3457 0884-2914 13:12<3453 1998 13 JMR https://doi.org/10.1557/JMR.1998.0470 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0470 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pezzotti Giuseppe Department of Materials, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, 606 Kyoto, Japan NATIONALLICENCE 700 1- Kleebe Hans-Joachim Institut für Materialforschung, Universität Bayreuth, D-95440 Bayreuth, Germany NATIONALLICENCE 700 1- Ota Ken'ichi Institute of Scientific and Industrial Research, Osaka University, Ibaraki-shi, Mihogaoka 8-1, 561 Osaka, Japan NATIONALLICENCE 700 1- Nishida Toshihiko Department of Materials, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, 606 Kyoto, Japan NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/12(1998-12), 3453-3457 0884-2914 13:12<3453 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge