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Effects of Transition‐Metal Additions on the Properties of AlN
Author(s) -
Kasori Mitsuo,
Ueno Fumio,
Tsuge Akihiko
Publication year - 1994
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1994.tb07089.x
Subject(s) - materials science , transition metal , ceramic , tin , metal , oxide , mineralogy , metallurgy , composite material , chemistry , biochemistry , catalysis
Transition‐metal oxide additions to AlN ceramics produced no significant deterioration in thermal conductivity. In the present study, TiN, ZrN, TaC, NbC, W, and unidentified Hf phases, found as fine particles located inter‐ and intragranularly, were distributed randomly in the AlN. Phases containing Fe, Co, and Cr, on the contrary, always were located at the three grain points. Most of the added transition‐metal compounds turned the ceramics black or gray. The shading mechanism was attributed to optical absorption by the surfaces of the electrically conductive fine particles and to multiple reflections among these particles.