Rapid solidification in thermal spray deposition: Microstructure and modelling

Citation
Gx. Wang et al., Rapid solidification in thermal spray deposition: Microstructure and modelling, SADHANA, 26, 2001, pp. 35-57
Citations number
51
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Engineering Management /General
Journal title
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES
ISSN journal
0256-2499 → ACNP
Volume
26
Year of publication
2001
Part
1-2
Pages
35 - 57
Database
ISI
SICI code
0256-2499(200102/04)26:<35:RSITSD>2.0.ZU;2-X
Abstract
Mechanical, thermal, and adhesive properties of thermal spray coatings are primarily determined by the phase and microstructure of single splats, whic h ultimately depend on rapid solidification of each splat and on the intera ctions between the splats and between the splat and the substrate. Signific ant efforts are being made to develop a better understanding of the physica l mechanisms underlying these phenomena. This paper reviews a series of wor k in the area of mathematical modelling of phase and microstructure formati on during the rapid solidification of single splats and coatings. The model development has been complimented by special experiments. Conditions under which planar interface solidification occurs, columnar cellular or dendrit ic growth takes place, or banded structure forms, have been identified. A m icrostructure map can therefore be built using the model presented here. Th e process parameters that promote crystalline nucleation and grain structur e formation can be isolated and the effect of interfacial heat transfer, sp lat substrate temperature difference, and substrate melting and resolidific ation can be examined using the model. The model predictions agree qualitat ively well with the experimental data for alumina, yttria, partially-stabil ized zirconia, and molybdenum.