Production of complex microchanneled parts of ZrB2-MoSi2 ultra-high temperature ceramics by freeze casting and pressureless spark plasma sintering

IF 5.8 2区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of The European Ceramic Society Pub Date : 2024-10-03 DOI:10.1016/j.jeurceramsoc.2024.116966
Álvaro Sández-Gómez, Angel L. Ortiz, Pedro Miranda
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Abstract

A novel approach for manufacturing complex parts of ultra-high-temperature ceramics (UHTCs) is proposed, combining freeze casting with pressureless spark plasma sintering (SPS). With the aid of MoSi2 sintering additive (15 vol% or more), this combination enables the production of fully dense ZrB2-based UHTC parts at 1900 °C. Producing complex-shaped samples including an intricate network of internal microchannels seems feasible, by using additive manufacturing techniques in the production of templates for the external silicone mould and the internal microchannel network to be used during the freeze casting process. Although defects are prone to occur either during freeze drying, due to thermal stresses arising from the expansion mismatch between the internal resin template and the ceramic preform, or during the resin burn-out or SPS cycles, the resulting samples exhibited a fully dense microstructure and similar hardness (17 ± 1 GPa) as the bulk material. Thus, the proposed approach shows promise in the production of arbitrarily complex-shaped UHTC parts that may find application in numerous industrial sectors including aerospace, aviation, and energy generation and storage.
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通过冷冻铸造和无压火花等离子烧结生产 ZrB2-MoSi2 超高温陶瓷的复杂微通道部件
本文提出了一种制造超高温陶瓷(UHTC)复杂部件的新方法,将冷冻铸造与无压火花等离子烧结(SPS)相结合。借助 MoSi2 烧结添加剂(15 Vol% 或更高),这种组合能在 1900 °C 下生产出完全致密的 ZrB2 基超高温陶瓷部件。通过使用增材制造技术生产外部硅胶模具模板和内部微通道网络模板,在冷冻铸造过程中使用这些模板,生产包括复杂的内部微通道网络在内的复杂形状样品似乎是可行的。虽然在冷冻干燥过程中,由于内部树脂模板和陶瓷预型件之间的膨胀不匹配所产生的热应力,或在树脂烧尽或 SPS 循环过程中,容易出现缺陷,但所得到的样品显示出完全致密的微观结构和与块状材料相似的硬度(17 ± 1 GPa)。因此,所提出的方法有望生产出任意复杂形状的超高真空陶瓷部件,这些部件可应用于众多工业领域,包括航天、航空以及能源生产和储存。
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来源期刊
Journal of The European Ceramic Society
Journal of The European Ceramic Society 工程技术-材料科学:硅酸盐
CiteScore
10.70
自引率
12.30%
发文量
863
审稿时长
35 days
期刊介绍: The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.
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