Journal of Applied Mechanical Engineering

In situ processing of intermetallic coatings

International Conference on Design and Production Engineering

July 25-26, 2016 Berlin,Germany

Ana Sofia C M d Oliveira

Universidade Federal do Paraná, Brazil

Posters & Accepted Abstracts: J Appl Mech Eng

Abstract:

Coatings protect mechanical components against the deleterious effects of wear and corrosion postponing the onset and/or the rate of degradation. Equipment of processing industries has been successfully protected with superalloys coatings. However, as a higher efficiency is imposed working temperatures increase and a better response from materials is required. Advance materials and technologies are required to meet this challenge. This study contributes to this argument by addressing the processing and understanding of the performance of intermetallic coatings of two systems: Nb-Al-Si and Ni-Al, respectively. In situ synthesis of the ordered alloys occurs during the deposition of powder mixtures by Plasma transferred arc. The exothermal synthesis contributed to increase the available heat during deposition mitigating the poor weldability expected from these alloys. The Si content in the NbAlSi powder mixture illustrates the determining effect of the deposited chemical composition on the microstructure of coatings. The important role of the interaction with the substrate is shown by the change in the characteristics of NiAl coatings. Coatings hardness increased with dilution associated with the change in the point defect structure whereas the composition determined high temperature wear performance of coatings. The study shows that in situ synthesis allows tailoring coatings but the understanding of the interaction with the substrate determines coating properties. This is of particular relevance since the interrelationship microstructure-properties in ordered structures are different from that of conventional solid solution materials.

Biography :

Email: sofmat.ufpr@gmail.com