Effects of surface roughness on wettability of reactive metal/ceramic wetting systems at high temperature

Mao Wu, Ling Ling Chang, Xin Lu, Xin Bo He, Xuan Hui Qu

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Effects of substrate roughness(Ra) on wettability of metal/ceramic combound-forming wetting systems were investigated by sessile drop technique at high temperature. The AgCu-4.3 at%Ti/alumina and AgCu-4.3 at%Ti/graphite wetting systems were selected, the Ra range used for alumina is 256-636 nm, and 265-1898 nm for graphite. The results show that the substrate roughness has strong effect on the thickness and lateral growth of the interfacial reaction product layer, wetting kinetics and the final contact angle (θf). The θf of the two systems increases with the increasing of Ra at 1200 K. The wettability of the reactive metal/ceramic system depends on the lateral growth of reaction product layer. With the increase of substrate roughness, the diffusion distance of the reactive element moving to the lateral growth front is actually increased, and the movement of triple line is also delayed by the asperities of rough surface, which restrained the lateral growth of the product layer. Meanwhile, the reactive element Ti tends to move to the interface region, leading to the increase of the interfacial product layer. Wetting on rough surface exhibits the slow spreading and a short period of spreading time, resulting in the increase in θf.

Original languageEnglish
Pages (from-to)25-32
Number of pages8
JournalCailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment
Volume37
Issue number7
Publication statusPublished - 2016 Jul 25
Externally publishedYes

Keywords

  • Driving force
  • Reactive wetting
  • Roughness
  • Wettability
  • Wetting kinetics

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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