High-Temperature Oxidation Behavior of a Ni-Cr-W-Al Alloy

• 来源期刊: 材料科学技术学报：英文版
• 学科: 工学
• 关键词: 高温氧化行为 Al合金 高温抗氧化性能 Cr2O3 镍铬 动力学测定 X射线衍射 Al2O3
• 年，卷（期）: 2011,（9）
• 页码范围: 841-845
• 页数: 5页
• 分类号: TQ174.758|TG249.7
• 语种: 英文

摘要

A study was conducted to examine the isothermal oxidation behavior of a new Ni-Cr-W-AI alloy in air at 1250℃ with different time. Oxidation kinetics was determined from weight-change measurements. The microstructure and composition of the oxide scale were investigated by means of scanning electron microcopy and X-ray diffraction. The results showed that the oxide scales of the alloy were a compact and continuous outer Cr2O3 and NiCr2O4 layer and an inner Al2O3 layer that was in dendrite shape. Oxides scales with good adherence were formed on the surface of the alloy, which made the alloy perform excellent high-temperature oxidation resistance.