东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2003, Vol. 24 ›› Issue (1): 75-78.DOI: -

• 论著 • 上一篇    下一篇

铸造镍基高温合金K35的氧化动力学

李云;袁超;郭建亭;杨洪才   

  1. 东北大学材料与冶金学院 ; 中国科学院金属研究所 ; 中国科学院金属研究所 ; 东北大学材料与冶金学院 辽宁沈阳　110004
  • 收稿日期:2013-06-23 修回日期:2013-06-23 出版日期:2003-01-15 发布日期:2013-06-23
  • 通讯作者: Li, Y.
  • 作者简介:-
  • 基金资助:
    国家自然科学基金资助项目(59895152)·

Oxidation kinetics of cast Ni-base superalloy K35

Li, Yun (1); Yuan, Chao (2); Guo, Jian-Ting (2); Yang, Hong-Cai (1)   

  1. (1) Sch. of Mat. and Metall., Northeastern Univ., Shenyang 110004, China; (2) Inst. of Metal Res., Chinese Sci., Shenyang 110016, China
  • Received:2013-06-23 Revised:2013-06-23 Online:2003-01-15 Published:2013-06-23
  • Contact: Li, Y.
  • About author:-
  • Supported by:
    -

RichHTML

1

PDF (PC)

798

摘要： 用静态增重法研究了K35镍基铸造高温合金的800℃氧化动力学·结果表明,K35合金的氧化动力学遵循抛物线规律,属于完全抗氧化级·利用X射线衍射、扫描电镜和能谱分析确定K35合金氧化膜组成以Cr2O3为主,含有NiCr2O4及TiO·TiO2·由于钛氧化物的存在,在高温氧化期间,K35合金发生了内氧化·

关键词: 高温合金, 高温氧化, 氧化动力学, 静态增重法, 抗氧化级, 内氧化

Abstract: The oxidation kinetics and the oxidation layer of a cast Ni-base superalloy K35 at 800°C were studied by still TGA method. The results show that oxidation kinetics of the superalloy K35 obeys the parabolic law. The oxidation stage can be divided into two parts within 100 h: the oxidation rate are 2.50×10-7 mg2/cm4·s in first stage and 2.05×10-7 mg2 /cm4 ·s in the other stage. Because the average oxidation velocity is 0.00263 mg/cm·h for 100 h, the oxidation resistance of the superalloy K35 is the first grade. It is suggested that oxidation rate of the superalloy K35 is dependent on the growth dynamics of Cr2O3. The oxide layer was examined by X-ray diffraction, scanning electron microscopy (SEM) and energy spectrum analysis (ESA). The layer is thin and consists of Cr2O3 mainly with a bit of NiCr2O4 and TiO·TiO2. During oxidation at 800°C, the inner oxidation occurs in the superalloy.

中图分类号: