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Mechanical Properties of CoAl Materials with the Combined Additions of ZrO 2 (3Y) and Al 2 O 3
Author(s) -
Takano Yoshihiko,
Yoshinaka Masaru,
Hirota Ken,
Yamaguchi Osamu
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.tb01032.x
Subject(s) - materials science , microstructure , spark plasma sintering , flexural strength , intermetallic , fracture toughness , coal , tetragonal crystal system , sintering , composite material , toughness , metallurgy , crystal structure , crystallography , alloy , chemistry , organic chemistry
Intermetallic CoAl powder has been prepared via self‐propagating high‐temperature synthesis (SHS). Dense CoAl materials (99.6% of theoretical) with the combined additions of ZrO 2 (3Y) and Al 2 O 3 have been fabricated via spark plasma sintering (SPS) for 10 min at 1300°C and 30 MPa. The microstructures are such that tetragonal ZrO 2 (0.3 μm) and Al 2 O 3 (0.5 μm) particles are located at the grain boundaries of the CoAl (8.5 μm) matrix. Improved mechanical properties are obtained; especially the fracture toughness and the bending strength of the materials with ZrO 2 (3Y)/Al 2 O 3 = 16/4 mol% are 3.87 MPa·m 1/2 and 1080 MPa, respectively, and high strength (>600 MPa) can be retained up to 1000°C.