首页|提高悬浮浸渍开孔泡沫Inconel 625高温合金的烧结动力学和成分均匀性

提高悬浮浸渍开孔泡沫Inconel 625高温合金的烧结动力学和成分均匀性

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采用悬浮液浸渍法制备开孔泡沫Inconel 625高温合金,先用混合粉末悬浮液复制纯镍泡沫带,然后进行热处理.本研究的目的是寻找一种合适的方法,在不使用低熔点添加剂的情况下,确保泡沫高温合金带的完全致密化,并在适中的烧结温度下获得均匀的化学成分.通过扫描电子显微镜和能谱仪对上述方法制备的泡沫带的显微组织和成分变化进行表征,并对其准静态压缩性能进行评估.结果表明,用Cr、Mo和Ni元素粉末作为高温合金粉末悬浮液的添加剂,在适中的烧结温度下,可获得化学成分均匀、密度高、符合Inconel 625标准的高温合金粉末悬浮液.这是因为低熔点共晶的形成,以及存在元素粉末时大的成分梯度所产生的非平衡热力学条件加速了扩散动力学.
Improving sintering kinetics and compositional homogeneity of Inconel 625 superalloy open-cell foams made by suspension impregnation method
Open-cell Inconel 625 superalloy foams were prepared by suspension impregnation method which involves replication of pure nickel foam ligaments with a mixed powder suspension and subsequent heat treatments. The objective of the present study is to find a suitable method ensuring complete densification of the superalloy foam ligaments without using low-melting additives and achieving uniform chemical composition at moderate sintering temperatures. Foams prepared using the above methodology were evaluated for the microstructure and compositional variation across the foam ligaments by scanning electron microscopy (SEM) coupled with electron dispersive spectroscopy (EDS). Quasi-static compressive properties of the foams were evaluated. It is shown that if elemental powders of Cr, Mo and Ni are used as additives to the superalloy powder suspension, high ligament density with uniform chemical composition conforming to the Inconel 625 specification is achieved at moderate sintering temperatures. These results are attributed to the formation of low melting eutectics and to acceleration of the diffusion kinetics due to the non-equilibrium thermodynamic conditions created by large compositional gradients in the presence of elemental powders.

superalloy foamsuspension replicationsinteringdiffusionmicrostructure

Oleg SMORYGO、Vitali MIKUTSKI、Anastasia VAZHNOVA、Viachaslau HANCHAROU、Serguei TIKHOV、Vinod Kumar JANAGAM、Amol Anant GOKHALE

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O.V. Roman Powder Metallurgy Institute, 41, Platonov str., Minsk 220005, Belarus

Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, 5, pr. Lavrentieva, Novosibirsk 630090, Russia

Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad 500058, India

Indian Institute of Technology Bombay, Powai, Mumbai 400076, India

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高温泡沫合金 悬浮液复制 烧结 扩散 显微组织

7196-22T20R-04920-53-00009

2021

10.1016/S1003-6326(21)65661-3

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(8)
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