无压放电等离子烧结（pSPS）过程中碳的存在对六铁体锶相分解的影响

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics Pub Date : 2025-06-05 DOI:10.1016/j.oceram.2025.100804

A. Učakar , A. Kocjan , B. Belec , J. Košir , T. Kallio , M. Kržmanc Maček , B. Arah , P. Jenuš Belec

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引用次数: 0

摘要

sr -六铁素体（SFO）陶瓷的相组成和微观结构决定了其硬磁性能。本文采用无压火花等离子烧结（pSPS）技术，在真空和还原条件下，在辐射石墨坩埚中（500°C/min）快速凝固SFO。建立了一个描述加热坩埚内温度分布的数值模型，以了解样品内的温度演变。复合pSPS烧结环境（真空下石墨加热坩埚）促进了相分解成各种形态变化的富锶和贫锶相，导致硬磁性能降低。值得注意的是，某些新形成的相具有较低的熔点，导致烧结机制从固态烧结转变为部分液相烧结机制。

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The role of carbon presence on the strontium hexaferrite phase decomposition during pressureless spark plasma sintering (pSPS)

The phase composition and microstructure of Sr-hexaferrite (SFO) ceramics govern the hard magnetic properties. Here, pressureless spark plasma sintering (pSPS) technique was employed for the rapid consolidation (500 °C/min) of SFO in a radiating graphite crucible under vacuum and, thus, reductive conditions. A numerical model depicting the temperature profile within the heating crucible was constructed to understand the temperature evolution within the samples. The combination pSPS sintering environment (graphite heating crucible under vacuum) promoted phase decomposition to Sr-enriched and depleted phases of various morphological variations, leading to reduction of hard magnetic properties. Notably, certain newly formed phases exhibited lower melting points, inducing a shift in the sintering mechanism from solid-state sintering to a partial liquid-phase sintering mechanism.

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