Evolution of Pore Structure in Compacts Produced from Nickel Carbonyl Powders during Sintering

IF 0.9 4区材料科学 Q3 MATERIALS SCIENCE, CERAMICS

Powder Metallurgy and Metal Ceramics Pub Date : 2024-06-04 DOI:10.1007/s11106-024-00415-7

P. Ya. Radchenko, O. I. Hetman

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Abstract

The influence of pore structure evolution in compacts sintered from nickel carbonyl powder with an average particle size of 1.4 μm in the temperature range 200–1000°C on local and bulk shrinkage was analyzed. The pore structure of the samples was characterized by the maximum and average diameters of pore channel constrictions determined by the Barus–Bechhold method. To minimize local (incoherent) shrinkage in the sintering of fine nickel powders, a criterion for pore structure homogeneity in compacts, α ≤ 0.03, was selected. The criterion was determined by the difference between the maximum and average diameters of pore channel constrictions. The influence of pore structure evolution on local and bulk shrinkage during sintering of compacts produced from nickel carbonyl powder with an average particle size of 1.4 and 4 μm was experimentally confirmed. The local shrinkage was due to the three-level structure and wide particle size distribution of the nickel carbonyl powders. A method was proposed to determine the average diameter of particles (agglomerates) in nickel carbonyl powders using the Kozeny equation, establishing a relationship between the particle diameter, the maximum diameter of pore channel constrictions, and the porosity of the compacts, varying from 0.25 to 0.45.

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羰基镍粉末在烧结过程中产生的复合材料中孔隙结构的演变

在 200-1000°C 的温度范围内，分析了由平均粒径为 1.4 μm 的羰基镍粉烧结而成的致密体中孔隙结构演变对局部和整体收缩的影响。样品的孔隙结构是通过巴鲁斯-贝赫霍尔德法测定的孔隙通道收缩的最大直径和平均直径来表征的。为了最大限度地减少镍粉烧结过程中的局部（不连贯）收缩，选择了压实物中孔隙结构均匀性的标准 α ≤ 0.03。该标准由孔道收缩的最大直径和平均直径之差决定。实验证实了平均粒径为 1.4 和 4 μm 的羰基镍粉末在烧结过程中产生的致密体的局部收缩和整体收缩受孔隙结构演变的影响。局部收缩是由于羰基镍粉的三级结构和较宽的粒度分布造成的。提出了一种利用 Kozeny 方程确定羰基镍粉末中颗粒（团聚体）平均直径的方法，在颗粒直径、孔道收缩的最大直径和密实度之间建立了 0.25 至 0.45 的关系。

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来源期刊

Powder Metallurgy and Metal Ceramics 工程技术-材料科学：硅酸盐

CiteScore

1.90

自引率

20.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Powder Metallurgy and Metal Ceramics covers topics of the theory, manufacturing technology, and properties of powder; technology of forming processes; the technology of sintering, heat treatment, and thermo-chemical treatment; properties of sintered materials; and testing methods.