Analysis of the porosity formation during HVOF spraying
- Univ. of Barcelona (Spain)
On the basis of the proposed physical and mathematical models the formation of the gas and shrinkage porosity during the thermal spraying is investigated. The gas porosity model takes into account the parameters of spraying, powder particle material and substrate, droplet flattening and solidification heat and mass transfer processes and pores interaction. A model of the shrinkage porosity development includes the equations describing its formation under the solidification of the coating layers of the different shapes on account of the melt tension with the shrinkage. The shrinkage porosity microzones are shown to be formed near the crystals of the different shapes and its macrozones are established to be developed in the surface parts of the coating layers. The porosity parameters evolution is studied. The obtained results agree well with the tendencies of the gas and shrinkage porosity behavior observed experimentally.
- OSTI ID:
- 160528
- Report Number(s):
- CONF-940684-; ISBN 0-87170-509-5; TRN: IM9603%%110
- Resource Relation:
- Conference: 1994 national thermal spray conference, Boston, MA (United States), 20-24 Jun 1994; Other Information: PBD: 1994; Related Information: Is Part Of 1994 Thermal spray industrial applications: Proceedings; Berndt, C.C.; Sampath, S. [eds.] [State Univ. of New York at Stony Brook, NY (United States). Dept. of Materials Science and Engineering]; PB: 816 p.
- Country of Publication:
- United States
- Language:
- English
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