ABSTRACT Compact microchannel heat exchanger designs for supercritical CO2 power cycles are valued for equipment size reduction and increased heat transfer. They can be fabricated via transient-liquid phase (TLP) bonding, which utilises a lower melting point interlayer for bonding facilitation of etched thin plates. Haynes 230 and 282 TLP bonded stacks were exposed to high-purity CO2 at 1 bar/700 °C to 4000 h and 250 bar/720 °C (supercritical) to 1500 h. All samples obeyed parabolic kinetics after an oxide build-up stage of 500–1000 h. Mass gains were similar for the base and TLP bonded alloys, and oxide thicknesses and scales did not significantly differ around the TLP bond regions. There were some slight oxide compositional differences for the H282 TLP samples at 250 bar. There was a slight pressure effect on mass gain, as samples exposed at the higher pressure experienced higher initial mass gains, but then slower continued oxide growth. GRAPHICAL ABSTRACT

中文翻译：

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瞬态液相结合镍基合金在 1 bar 和 250 bar 二氧化碳中的高温氧化

摘要 用于超临界 CO2 动力循环的紧凑型微通道换热器设计对于减小设备尺寸和增加传热具有重要意义。它们可以通过瞬态液相 (TLP) 键合制造，该键合利用较低熔点的夹层促进蚀刻薄板的键合。Haynes 230 和 282 TLP 粘合叠层在 1 bar/700 °C 至 4000 小时和 250 bar/720 °C（超临界）至 1500 小时的条件下暴露于高纯度 CO2 中。在 500-1000 小时的氧化物堆积阶段后，所有样品都服从抛物线动力学。基体和 TLP 粘合合金的质量增加相似，并且 TLP 粘合区域周围的氧化物厚度和鳞片没有显着差异。在 250 bar 的压力下，H282 TLP 样品的氧化物成分略有不同。对质量增加有轻微的压力影响，因为暴露在较高压力下的样品经历了更高的初始质量增加，但随后氧化物的持续生长速度较慢。图形概要