稀土渗硼处理后TC4钛合金的高温抗氧化性能  

High-temperature Oxidation Resistance of TC4 Titanium Alloy by Rare Earth Boriding

作　　者：唐梓焜 冯芷琪 段永华[1] 何远怀[1] TANG Zikun;FENG Zhiqi;DUAN Yonghua;HE Yuanhuai(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《中国钨业》2024年第3期57-65,73,共10页China Tungsten Industry

基　　金：国家自然科学基金(52261018)。

摘　　要：为提高TC4钛合金的高温抗氧化性能,本研究利用稀土氧化物(Gd_(2)O_(3)、Tm_(2)O_(3)、Nd_(2)O_(3))对TC4钛合金进行稀土渗硼处理。通过扫描电子显微镜、X射线衍射仪以及电子探针分析稀土渗硼处理后的试样,结果表明,稀土会极大地提高渗硼层的厚度,但不会改变TiB_(2)+TiB的相组成。通过在不同高温条件下进行的循环氧化测试,发现随着暴露时间的延长和温度的升高,稀土渗硼后的TC4钛合金氧化程度明显增加,渗硼层对基体的保护作用明显降低。其中通过Nd_(2)O_(3)进行稀土渗硼处理的试样的氧化程度最小,在800℃下仍属于抗氧化级别。最后,讨论了三种试样的高温抗氧化机理,其过程与TiO_(2)和B_(2)O_(3)的形成有着密切的关系。To enhance the high-temperature oxidation resistance of TC4 titanium alloy,this study employs rare-earth boriding using rare-earth oxides(Gd_(2)O_(3),Tm_(2)O_(3),Nd_(2)O_(3)).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 TiB_(2)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 Nd_(2)O_(3)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 TiO_(2)and B_(2)O_(3).

关 键 词：TC4 稀土渗硼 循环氧化测试 高温抗氧化 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG178[金属学及工艺—金属材料]