Four wetting phases in AlN/Al and AlN composites/Al systems, models of nonreactive, reactive, and composite systems

Journal Article · Tue Jun 01 04:00:00 EDT 1993 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02668207· OSTI ID:6200701

Fujii, Hidetoshi; Nakae, Hideo; Okada, Koji ^[1]

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1. Waseda Univ., Tokyo (Japan). Department of Materials Science and Engineering

The contact angles between molten aluminum and samples of AlN and AlN composites were measured to establish a way of estimating the wetting of nonreactive systems, reactive systems, and composite systems. The experiments were conducted using an improved sessile drop technique which prevented the oxidation of the aluminum. By plotting the results on a logarithmic time scale, it was found that the contact angle value for AlN containing Y,O, as a sintering agent progressed through four phases (I: original-wetting phase, II: quasiequilibrium phase, III: interfacial-reaction-wetting phase, and IV: equilibrium phase), while the contact angle of purified AlN progressed through only two phases, I and IV. Phase III in the sample containing Y,O, was caused by the interfacial reactions; the wetting speed in phase III (interfacial-reaction- wetting speed) and the value of the contact angle in phase IV (equilibrium wettability) depend on the interfacial reactions. The contact angle for AlN composite also progressed through the four phases. The contact angle of phase II (original wettability) conformed to Cassie's law, whereas the contact angle of phase IV depended on the condition of the interface. However, Cassie's equation should be applicable throughout phases II through IV when the condition of the interface is understood. Also, the mechanism of the interfacial reaction wetting was explained using Cassie's equation by taking into account the ratio of area of components at the interface in phase III.

• OSTI ID: 6200701
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 24A:6; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM
ALUMINIUM COMPOUNDS
ALUMINIUM NITRIDES
CERAMICS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPOSITE MATERIALS
DATA
ELEMENTS
EXPERIMENTAL DATA
FABRICATION
FLUIDS
INCIDENCE ANGLE
INFORMATION
INTERFACES
LIQUID METALS
LIQUIDS
MATERIALS
MATERIALS TESTING
MECHANICAL TESTS
METALS
NITRIDES
NITROGEN COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PNICTIDES
TESTING
TRANSITION ELEMENT COMPOUNDS
WETTABILITY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES