화학공학소재연구정보센터
Applied Surface Science, Vol.257, No.14, 5972-5976, 2011
Effect of vacuum heat treatment on tensile strength and fracture performance of cold-sprayed Cu-4Cr-2Nb coatings
The previous study [1] indicated that dense thick Cu-4Cr-2Nb coatings could be formed by cold spraying, and the post-spray heat treatment could significantly influence the microstructure and microhardness of the as-sprayed Cu-4Cr-2Nb coatings. In this study, the tensile strength and fracture performance of the Cu-4Cr-2Nb coatings after annealing were investigated. The vacuum heat treatment was conducted under 10(-2) Pa at 850 degrees C for 4 h. Results showed that the heat treatment had a great contribution to the healing-up of the incompleteness of the interfaces between the deposited particles. In addition, the coating microhardness decreased from 156.8 +/- 4.6Hv(0.2) for the as-sprayed coatings to 101.7 +/- 4.5Hv(0.2) for the annealed ones. The mean tensile strength of the annealed coatings was approximately 294.1 +/-36.1MPa compared to that of 45.0 +/- 10.5MPa for the as-sprayed ones, which results from the partially metallurgically bonded zones between the deposited particles inducing by the heat treatment process. (C) 2011 Elsevier B. V. All rights reserved.