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ZrW 2 O 8 –ZrO 2 Continuous Functionally Graded Materials Fabricated by In Situ Reaction of ZrO 2 and WO 3
Author(s) -
Sun Li,
Kwon Patrick
Publication year - 2010
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.1551-2916.2009.03492.x
Subject(s) - materials science , sublimation (psychology) , composite material , thermal , yield (engineering) , thermal decomposition , thermodynamics , psychology , chemistry , physics , organic chemistry , psychotherapist
ZrO 2 powder and ZrO 2 +WO 3 powder mixture were stacked, cocompacted, and cosintered in a cylindrical die, the processing steps commonly used to fabricate multilayer materials. The soak duration and the mass ratio among layers in the processing have been varied to yield a wide range of final sintered samples. At appropriate soak durations, the sintered samples resulted in continuous functionally graded materials (FGMs) made of ZrW 2 O 8 and ZrO 2 . In other words, instead of the expected discrete, multiple‐layered materials, the resulting samples are characterized by the axially, continuously varying physical properties. The continuous FGM structure is formed by several mechanisms: the balance between the reaction of ZrO 2 and WO 3 and the decomposition of ZrW 2 O 8 , as well as the sublimation and diffusion of WO 3 . The continuous FGMs can be utilized to reduce the thermal stress induced from a thermal gradient loading within a material system. This study shows that the processing steps typically used for multilayer FGMs can also be used to create continuous FGMs for some special material combinations.