Protection of N‑Type (Ni,Fe)TiSb Half-Heusler Materials against Static and Cyclic Oxidation Using a Si-Doped Cr Coating
Mikdat Gurtaran, Zhenxue Zhang, Xiaoying Li, Hanshan Dong
TL;DR
A Cr-Si coating was developed to protect thermoelectric materials from oxidation at high temperatures, significantly improving their durability.
Contribution
A novel Cr–Si coating is shown to effectively protect N-type (Ni,Fe)TiSb materials from static and cyclic oxidation.
Findings
Uncoated samples formed a TiO2 layer and NiSb-rich zone with cracking and delamination.
Cr–Si coatings remained stable and resistant to oxidation under both static and cyclic conditions.
Coated samples showed negligible mass gain and no mechanical damage after exposure.
Abstract
In this study, Cr–Si coatings were deposited on N-type (Ni,Fe)TiSb thermoelectric (TE) materials by using a closed-field unbalanced magnetron sputtering PVD technique. Oxidation behavior was evaluated under both isothermal (static) conditions (500 °C for 10 h and 600 °C for 50 h) and thermal cycling regimens (500 and 600 °C for 10 or 50 1 h cycles). Mass gain, surface morphology, cross-sectional microstructure, elemental distribution, and phase composition were examined by using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). Regardless of exposure mode, uncoated samples oxidized severely: a duplex scale formed, consisting of an outer TiO2 layer and a subjacent NiSb-rich zone, accompanied by extensive cracking and delamination. In sharp contrast, the Cr–Si coatings remained thermally stable and highly oxidation-resistant,…
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Taxonomy
TopicsAdvanced Thermoelectric Materials and Devices · Heusler alloys: electronic and magnetic properties · Intermetallics and Advanced Alloy Properties