摘要
采用热压烧结制备Ta-W合金和Ta-W-TiB_2合金,研究两种合金在700、800和900℃的高温氧化行为,通过X射线衍射分析、扫描电子显微镜观察和能谱分析对合金的氧化层组分和组织形貌进行分析。结果表明:两种合金经热压烧结后的相对密度均达到97%以上,可以实现致密化。在氧化温度范围内所有合金的氧化动力学曲线都遵循直线规律,氧化温度升高氧化速率逐渐增大。Ta-W合金的氧化产物为Ta_2O_5固溶体,Ta-W-TiB_2合金的氧化产物为Ta_2O_5固溶体和TiO_2氧化物。在700～800℃下,稳定的TiO_2提高了Ta-W-TiB_2合金的抗氧化能力,但在900℃时,TiO_2的破坏大大减弱了氧化层对基体的保护能力。
Ta-W and Ta-W-TiB2 alloys were prepared by hot pressing sintering.The oxidation behavior of Ta-W and Ta-W-TiB2 alloys at the temperature of 700,800,and 900℃were studied.The composition and morphology structure of the oxide layer were analyzed by X-ray diffraction(XRD),scanning electron microscope(SEM),and energy spectrum analysis(EDS).The results show that,the relative density of Ta-W and Ta-W-TiB2 alloys prepared by hot pressing sintering is beyond 97%.In the oxidation temperature range,the oxidation kinetics curves of all alloys follow the linear rate law,and the oxidation rate increases with the increase of oxidation temperature.The oxidation products of Ta-W alloys are the Ta2O5 solid solution,and the oxidation products of Ta-W-TiB2 alloys are the Ta2O5 solid solution and TiO2.The stable TiO2 improves the antioxidant capacity of the alloy at 700~800℃.However,the destruction of TiO2 at 900℃greatly weakens the protection ability of oxide layer to protect the substrate.
作者
赵成会
陈宇红
羿舟昌
李璐
王鸿业
ZHAO Cheng-hui;CHEN Yu-hong;YI Zhou-chang;LI Lu;WANG Hong-ye(School of Material Science and Engineering,North Minzu University,Yinchuan 750021,China)
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2019年第2期91-97,共7页
Powder Metallurgy Technology
基金
国家自然科学基金资助项目(51464001)
区级大学生创新训练项目(QJCX–2017–048)
关键词
钽钨合金
TIB2
高温氧化
氧化动力学
tantalum tungsten alloy
TiB2
high temperature oxidation
oxidation kinetics
作者简介
通信作者:陈宇红,E-mail:lyhchen@163.com。
