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Advanced Alumina Composites Reinforced with Titanium‐Based Alloys
Author(s) -
Günther Robert,
Klassen Thomas,
Dickau Birte,
Gärtner Frank,
Bartels Arno,
Bormann Rüdiger
Publication year - 2001
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.1151-2916.2001.tb00869.x
Subject(s) - materials science , composite material , ceramic , sintering , compaction , ball mill , alloy , electrical resistivity and conductivity , volume fraction , flexural strength , metal , titanium , abrasive , metallurgy , electrical engineering , engineering
New (inter)metallic‐ceramic composites for high‐temperature structural and functional applications are prepared via high‐energy ball milling. During compaction by pressureless sintering, dense Al 2 O 3 /Ti‐based alloy composites are formed that consist of inter‐connected networks of the ceramic and the (inter)metallic phases. Ti‐Al‐V/Al 2 O 3 and Ti‐Al‐Nb/Al 2 O 3 composites show enhanced damage tolerance over monolithic Al 2 O 3 , i.e ., fracture toughnesses up to 5.6 MPa·m 0.5 and bending strengths up to 527 MPa. The resistance against abrasive wear is almost doubled with respect to monolithic Al 2 O 3 ceramic. Electrical resistivity scales with the ceramic volume fraction and ranges between 0.3 mΩ·cm and 55.1 mΩ·cm, with only a weak temperature dependence ≤700°C.