To enhance the high-temperature oxidation resistance of TC4 titanium alloy,this study employs rare-earth boriding using rare-earth oxides (Gd2O3,Tm2O3,Nd2O3). The specimens underwent analysis through scanning electron microscopy (SEM),X-ray diffraction (XRD),and electron probe micro-analyzer (EPMA). The results demonstrate that the addition of rare-earth elements significantly increases the thickness of the boride layer,while the phase composition remains unchanged,consisting of TiB2 and TiB. Cyclic oxidation tests conducted under varying high-temperature conditions reveal a significant increase in oxidation degree with prolonged exposure time and higher temperatures,leading to a diminished protective effect of the boride layer on the substrate. Notably,the oxidation degree of the specimen subjected to rare-earth boriding with Nd2O3 was the lowest,maintaining antioxidant properties even at an oxidation temperature of 800 ℃. Finally,the high-temperature oxidation mechanisms of the three specimens are discussed,highlighting a close relationship with the formation of TiO2 and B2O3.
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