摘要
为了解钨铼热电偶丝在空气中的氧化过程、氧化产物成分、氧化膜生长情况,进行了DSC/TG、XRD、SEM等实验.通过填充惰性物质、脱氧、造氢、密封等实体化技术对钨铼热电偶进行了防氧化保护,利用SEM观察了保护后的钨铼偶丝的形貌.结果表明:在空气中,钨铼偶丝高温氧化产物主要为WO3;W-5%Re偶丝873℃时已经可以观察到氧化,W-26%Re的氧化温度可低至681℃;钨铼偶丝氧化层开裂并呈放射状生长,不能形成保护性氧化膜;经防护后的钨铼偶丝断面保持完整,未出现明显氧化膜.
DSC/TG, XRD and SEM tests were employed to study the oxidation behavior of tungsten - rhenium thermocouple wires： oxidation process in the air, composition of the oxidation products and growth of the oxide film. The tungsten - rhenium thermocouple wires were protected with the solidified technology and then were observed by SEM. The results showed that, in the air, the oxidation of W -26% Re thermocouple wires could be found at 681℃ while W - 5% Re at 873℃. The major oxidization products were WO3 at high temperature. The oxide layers could not form a protective film because they cracked and grew in a form of radiation. For the protected tungsten - rhenium thermocouple wires, the section was intact, and no oxide was found.
出处
《材料与冶金学报》
CAS
北大核心
2014年第1期55-59,共5页
Journal of Materials and Metallurgy
基金
辽宁省科技型中小企业创新基金(10C26222110454)
关键词
钨铼热电偶
氧化
铼效应
实体化
tungsten - rhenium thermocouple
oxidation
rhenium effect
solidified technology
