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首页> 外文期刊>Powder Metallurgy >Ni-base superalloy powder-processed porous layer for gas cooling in extreme environments
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Ni-base superalloy powder-processed porous layer for gas cooling in extreme environments

机译：镍基高温合金粉末处理的多孔层，用于极端环境下的气体冷却

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Extreme high temperature conditions demand novel solutions for hot gas filters and coolant access architectures, i.e., porous layers on exposed components. These high temperatures, for example in current turbine engines, are at or exceeding current material limits for high temperature oxidation/corrosion, creep resistance, and, even, melting temperature. Thus novel blade designs allowing greater heat removal are required to maintain airfoil temperatures below melting and/or rapid creep deformation limits. Gas atomised Ni-base superalloy powders were partially sintered into porous layers to allow full-surface, transpirational cooling of the surface of airfoils. These powder-processed porous layers were fully characterised for surface, morphology, cross-sectional microstructure, and mechanical strength characteristics. A sintering model based on pure Ni surface diffusion correlated well with the experimental results and allowed reasonable control over the partial sintering process to obtain a specified level of porosity within the porous layer.
机译：极端高温条件要求用于热气过滤器和冷却剂通道结构（即裸露部件上的多孔层）的新颖解决方案。这些高温，例如在当前的涡轮发动机中，在高温氧化/腐蚀，抗蠕变性以及甚至熔化温度方面处于或超过当前的材料极限。因此，需要允许更大散热的新颖叶片设计，以将翼型温度保持在熔融和/或快速蠕变变形极限以下。将气体雾化的镍基高温合金粉末部分烧结成多孔层，以使机翼表面全表面蒸腾冷却。这些粉末加工的多孔层的表面，形态，横截面微观结构和机械强度特性均得到了充分表征。基于纯镍表面扩散的烧结模型与实验结果紧密相关，可以合理控制部分烧结过程，以在多孔层中获得指定的孔隙度。

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