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Brazing Graphite to Aluminum Nitride for Thermal Dissipation Purpose
Author(s) -
Chou TsungTe,
Tuan WeiHsing,
Nishikawa Hiroshi,
Weng BiingJyh
Publication year - 2017
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201600876
Subject(s) - materials science , brazing , graphite , composite material , nitride , aluminium , titanium , thermal conductivity , foil method , flexural strength , metallurgy , titanium carbide , carbide , alloy , layer (electronics)
In the present study, graphite paper is joined to aluminum nitride (AlN) using an active Ag–Cu–Ti foil. The Ti in the brazing foil diffuses to AlN side to form titanium nitride, to graphite side to form titanium carbide during bonding. The thermal diffusivity of the AlN–AgCuTi graphite joint is double that of AlN substrate; the resulting thermal conductivity of the joint is, thus, higher. Though the flexural strength of the joint is half that of AlN substrate, it can deflect for 1 mm at a 28 mm span without failure. The large deflection capability can be related to the sliding between graphite sheets within the graphite paper