摘要
采用内氧化法制备ZrO2弥散强化Pt-Ir-Zr高温材料。探讨了内氧化热力学条件,并利用SEM分析内氧化时间对形貌的影响,结合抗拉强度的变化确定最优的内氧化时间。结果表明:在实验条件下会发生Ir、Zr的氧化。Zr比Ir氧化所需的氧分压小。随着内氧化时间的增加,晶粒长大。直到40h后,组织达到稳定。抗拉强度随着内氧化时间的增加呈指数降低。内氧化最优时间为40h。
An internal oxidation method was applied to investigate the dispersion-strengthening of Pt-Ir-Zr alloy, and the thermodynamic condition was explored for this alloy. Scanning electron microscopy （SEM） was employed to analyze the internal oxidation morphologies. Combining with tensile strength, the optimal internal oxidation time was determined. The results show that oxidation of Ir and Zr will occur under the experimental condition, and the oxygen pressure of Zr is lower than that of Ir. The grain size of the alloy increases with the prolonging of time and remains stable when the oxidation time is up to 40 h. The tensile strength decreases exponentially with the increase of oxidation time. The time for optimal internal oxidation is 40 h at 1100 °C.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2011年第4期585-589,共5页
Rare Metal Materials and Engineering
基金
Yunnan Province Fundation(2007E125M)
National Basic Research Program of China(2008CB617609)
关键词
Pt-Ir-Zr合金
内氧化
热力学
弥散强化
Pt-Ir-Zr alloy
internal oxidation
thermodynamic
dispersion-strengthening
