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Effect of Ni and Co Additives on Phase Decomposition in TiB 2 –WB 2 Solid Solutions Formed by Induction Field Activated Combustion Synthesis
Author(s) -
Shibuya Masachika,
Yoneda Takanori,
Yamamoto Yutaka,
Ohyanagi Manshi,
Munir Zuhair A.
Publication year - 2003
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.1151-2916.2003.tb00023.x
Subject(s) - decomposition , materials science , phase (matter) , solid solution , combustion , kinetics , chemical process of decomposition , hexagonal crystal system , chemical engineering , metallurgy , analytical chemistry (journal) , chemistry , crystallography , organic chemistry , physics , quantum mechanics , engineering
Solid solutions of TiB 2 –WB 2 were densified and annealed simultaneously to cause the decomposition into the phases (Ti,W)B 2 and (W,Ti)B 2 . Ni and Co were added to solid solutions formed by induction field activated combustion synthesis. The presence of these metals as additives markedly enhanced the kinetics of the subsequent decomposition process. With these additives, decomposition to the two phases occurred within minutes (360 s) in contrast to hours when the solutions did not include the additives. The phases resulting from decomposition, (Ti,W)B 2 and (W,Ti)B 2 , were identified by X‐ray to have the hexagonal AlB 2 and W 2 B 5 structures, respectively. The precipitated phase, (W,Ti)B 2 , occurred as elongated grains with aspect ratios of as high as about 10 in samples containing Ni as the additive.
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