Nanoscale dynamic wetting and spreading of molten Ti alloy on 6H-SiC

Shunichiro Tanaka, Chihiro Iwamoto

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We have investigated nanoscale features at the reactive wetting front of the molten Ag-27.4 wt.% Cu-4.9 wt.% Ti on 6H-SiC using video movies recorded in situ on a high-temperature stage of a high-resolution transmission electron microscope and also proposed a model of a chemical reaction at each tip. One of the features of reactive wetting and spreading at 1073 K in 4 × 10-5 Pa was the discontinuous motion of the tip, and the halting time depended on the thickness of an amorphous Si-O layer on SiC, which can be explained by the time needed for the decomposition of the layer by Ti atoms to form TiC nanoparticles since Ti atoms in the molten alloy sufficiently rapidly diffuse to the tip on the SiC surface. Molten Ti and TiC nanolayers preceded the Ti5Si3 nanolayer at the tip. The reaction required to form the TiC nanolayer is also the rate-determining step for spreading. The contact angle of the tip increased up to 60-80° when the tip halted, whereas the tip decreased down to 10° on the nonbasal plane and 20° on the basal plane of SiC when it traveled rapidly. The high traveling angle of the molten tip on the basal polar plane of SiC indicates a high interfacial energy between Ti and SiC(0 0 0 1).

Original languageEnglish
Pages (from-to)168-173
Number of pages6
JournalMaterials Science and Engineering A
Volume495
Issue number1-2
DOIs
Publication statusPublished - 2008 Nov 15

Keywords

  • Amorphous film
  • Atomistic behavior at wetting front
  • In situ observation
  • Precursor film
  • Reactive wetting
  • SiC

ASJC Scopus subject areas

  • Materials Science(all)

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