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Numerical analysis for the accelerating behavior of spray particles in cold spraying is conducted using a computational fluid
dynamics program, FLUENT. The optimal design of the spray gun nozzle is achieved based on simulation results to solve the
problem of coating for the limited inner wall of a small cylinder or pipe. It is found that the nozzle expansion ratio, particle
size, accelerating gas type, operating pressure, and temperature are main factors influencing the accelerating behavior of
spray particles in a limited space. The experimental results using the designed short nozzle with a whole gun length of <70
mm confirmed the feasibility of optimal design for a spray gun nozzle used in a limited space. 相似文献
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Alumina, Al2O3 + 3 to 40 wt% TiO2, and Al2O3 + 40 wt% ZrO2 coatings were deposited by atmospheric plasma spraying (APS) and detonation gun spraying (DGS). The coatings were evaluated
by optical microscopy, microhardness measurements, and X- ray diffraction. Wear resistance of the coatings was evaluated by
rubber wheel sand abrasion and particle erosion test methods. Detonation gun- sprayed coatings exhibited more homogeneous
microstructures and somewhat higher microhardness than corresponding plasma- sprayed coatings. Small additions of TiO2 (3 wt%) improved both the abrasion and erosion wear resistance, whereas 40 wt% TiO2 significantly decreased the erosion wear resistance of both APS and DGS coatings. Alumina + 40% ZrO2 coatings exhibited the best abrasion wear resistance of both APS and DGS coatings, but the erosion wear resistance of these
coatings was lower than that of the Al2O3 and Al2O3 + 3 wt% TiO2 coatings. The best abrasion wear resistance of the coatings studied was obtained with DGS Al2O3 + 40 wt% ZrO2 and Al2O3 + 3 to 40 wt% TiCh coatings. These coatings exhibited lower wear rates than bulk Al2O3. The best erosion wear resistance was obtained with the DGS Al2O3 + 3 wt% TiO2 coating; however, it exhibited a higher wear rate than bulk Al2O3. In general, detonation gun- sprayed coatings showed significantly enhanced abrasion and erosion wear resistance than the
corresponding plasma- sprayed coatings. 相似文献
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A new tool for improving spray gun transfer efficiency 总被引:1,自引:0,他引:1
Richard J. Klein 《Metal Finishing》2002,100(8):34-39
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