Abstract
Boriding of the Ti-Al intermetallic GE48-2-2 at 1273 K for 10 hours was performed. In order to ensure that no any serious alteration occurred in the substrate, it was previously examined with X-Ray Diffractometry (XRD), after it has undergone an annealing process at the temperature of boronizing. Subsequently, we examined the coating with XRD and Scanning Electron Microscopy, in order to characterize its structure and morphology. A dense TiΒ2 layer, 10 - 15 μm thick, was formed, but also Cr2B3 and NbN, BN and some Ti-Al phases were detected. Efforts were undertaken to focus on influence of the substrate modification, towards the quality of the coating.
Highlights
The Ti-Al intermetallics are light, high-temperature oxidation resistant materials and can find application in automotive, aerospace and power industry [1]
In order to ensure that no any serious alteration occurred in the substrate, it was previously examined with X-Ray Diffractometry (XRD), after it has undergone an annealing process at the temperature of boronizing
We investigated the role of the substrate modification, caused by the heat treatment, and the effect of the residual atmospheric gases in the structure and composition of the coating
Summary
The Ti-Al intermetallics are light, high-temperature oxidation resistant materials and can find application in automotive, aerospace and power industry [1] They could replace Ni superalloys in these applications [1], as they have almost two times lower density. They are more sufficient than pure titanium due to their higher elastic modulus and strength and better oxidation resistance at high temperatures [1]. These properties result from the dominant presence of the γ-TiAl phase.
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