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| Abstract No.: |
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| Title: |
Influence of particle velocity on splat formation during thermal spraying
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| Authors: |
Yuriy Kharlamov / Ghulam Ishag Khan Institute of Engineering Sciences and Technology, Pakistan
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| Abstract: |
Current understanding of mechanisms of splat formation during thermal spraying are discussed. Schematic of influence of particle velocity on change of impact and forward pressure during particle-substrate interaction are given. The existence of three typical zones of particle-substrate contact is shown. These zones are: (1) central circle type mechanically activated only by effect of impact and forward pressure; (2) middle ring-shaped mechanically activated by forward pressure and friction of spreading particle; (3) peripheral ring-shaped mechanically activated by friction of spreading particle. It is possible to estimate dimensions of these zones analytically. The stress distribution on particle-substrate contact during splat formation is discussed. It is shown that relative values of area for these zones depends from particle velocity. The presence of these typical zones during splat formation shown by conduction of special model experiments. The plasma and detonation spraying methods were used. The clean polished substrates from silicon and copper were used. The silicon substrate with thin films also were used. The proposed model of splat formation is useful for prediction of sprayed particles behavior and selection of optimal spraying conditions.
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