Ta含量对镍基粉末高温合金高温氧化性能的影响  

Effect of Ta Content on High Temperature Oxidation Performance of Nickel-based PM Superalloys

作　　者：杨志昆 王浩[1] 张义文 胡本芙[1] Yang Zhikun;Wang Hao;Zhang Yiwen;Hu Benfu(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing CISRI-Gaona Materials Technology Co.,Ltd,Beijing 100081,China)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]北京钢研高纳科技股份有限公司,北京100081

出　　处：《稀有金属材料与工程》2021年第9期3233-3241,共9页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2016YFB0700505)。

摘　　要：采用XRD、FEG-SEM和EDS等实验技术对不同Ta含量合金在800℃条件下进行抗氧化性能的研究。结果表明,含Ta合金的氧化增重和氧化时间的关系曲线符合抛物线规律,氧化层为Al_(2)O_(3)+NiCr_(2)O_(4)+Ta_(2)O_(5)+(Ti/Cr)TaO_(4)的复合氧化物结构,而随着Ta含量的增加,氧化层厚度减小,且氧化深度变浅,氧化层也变得更加平滑而致密。实验发现,在外层和内层氧化层之间存在富Ta的氧化物(Ta_(2)O_(5),(Ti/Cr)TaO_(4)),很容易与Cr_(2)O_(3)结合形成CrTaO_(4),从而减少高温下Cr_(2)O_(3)氧化物的挥发损失,提高合金的抗氧化性能。富Ta氧化物Ta_(2)O_(5),(Ti/Cr)TaO_(4)的出现能阻碍金属阳离子向外扩散的速率,Ta元素的加入改变了氧化层离子扩散速率从而提高了合金的抗氧化性能。The oxidation resistance of superalloys(FGH98) with different Ta element contents at 800 ℃ was studied by XRD, FEG-SEM and EDS.The results show that the relationship between oxidation mass gain and oxidation time of Ta-containing alloys conforms to parabolic kinetics law,and the oxide layer is Al_(2)O_(3)+NiCr_(2)O_(4)+Ta_(2)O_(5)+(Ti/Cr)TaO_(4) composite oxide structure. With the increase of Ta content, the thickness of the oxide layer decreases, the oxidation depth becomes thinner, and the oxide layer becomes smoother and denser. There is a Ta-rich oxide(Ta_(2)O_(5),(Ti/Cr)TaO_(4))between the outer layer and the inner oxide layer, which can easily combine with Cr_(2)O_(3)to form CrTaO_(4), which reduces the volatilization loss of Cr_(2)O_(3) oxide at high temperatures and improves the oxidation resistance of the alloy. The appearance of Ta-rich Ta_(2)O_(5)and(Ti/Cr)TaO_(4) can hinder the out-diffusion rate of metal ions. The addition of Ta changes the ion diffusion rate of the oxide layer, improving the oxidation resistance of the alloy.

关 键 词：粉末高温合金 TA 高温氧化 氧化产物 

分 类 号：TG146.15[一般工业技术—材料科学与工程]