The Effect of Rhodium Addition on Degradation Behavior of Ir-10 mass%Rh Alloy during Oxidation at Elevated Temperatures

IF 0.5 4区 材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING
Mitsutoshi Ueda, Kenta Terai, Shunsuke Yokota, Shunsuke Takeya, Hayato Yasuhara, Yosuke Imai
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引用次数: 0

Abstract

This paper focuses on effect of rhodium addition on degradation behavior of Ir-10 mass%Rh alloy for a spark plug during oxidation at elevated temperatures. Oxidation tests were conducted at the temperature range from 1173 K to 1473 K in Ar-21%O2 gas mixture to clarify the effect of rhodium addition on degradation behavior of the alloy. As a result, there are three effects of rhodium addition to prevent the alloy from the degradation: (1) dissolution of rhodium into iridium oxide scale at below 1273 K, which decreases activity of iridium oxide in the oxide scale, (2) dissolution of rhodium into the alloy at above 1273 K, which decreases activity of iridium in the alloy and (3) formation of rhodium oxide, which decreases surface area of the alloy. All effects contribute to decrease vapor pressure of volatile iridium oxide, resulting in suppression of the degradation.
添加铑对Ir-10质量%Rh合金高温氧化降解行为的影响
研究了添加铑对火花塞用Ir-10质量%Rh合金高温氧化降解行为的影响。在1173 ~ 1473 K的Ar-21%O2混合气体中进行了氧化试验,以明确添加铑对合金降解行为的影响。结果表明,添加铑对合金的降解有三个作用:(1)在1273 K以下,铑溶解到氧化铱垢中,使氧化铱在氧化垢中的活性降低;(2)在1273 K以上,铑溶解到合金中,使合金中铱的活性降低;(3)氧化铑的形成,使合金的表面积减小。所有这些作用都有助于降低挥发性氧化铱的蒸气压,从而抑制降解。
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来源期刊
Journal of The Japan Institute of Metals
Journal of The Japan Institute of Metals 工程技术-冶金工程
CiteScore
0.70
自引率
0.00%
发文量
27
审稿时长
6-12 weeks
期刊介绍: Information not localized
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