A novel and promising thermal insulation material: Monazite-type porous LaPO4 ceramics possessing ultra-low thermal conductivity and enhanced strength

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2024-07-06 DOI:10.1016/j.ceramint.2024.07.065

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Abstract

In this study, novel porous LaPO₄ ceramics possessing closed spherical pores and thin pore walls have been firstly synthesized using the particle-stabilized foaming method. Affected by the calcination temperature together with solid loading, the obtained porous LaPO₄ ceramics exhibit high porosity (81.69–94.21 %), very low thermal conductivity (κ) (0.124–0.398 W m⁻¹ K⁻¹) and relatively high compressive strength (0.886–9.30 MPa). When the calcination temperature and solid loading are 1500 °C and 35 wt%, optimized porous LaPO₄ ceramics achieve a better balance between thermal conductivity (0.160 W m⁻¹ K⁻¹) and compressive strength (2.07 MPa). Based on this, the prediction model for the thermal conductivity is screened and the thermal insulating capability is further verified. This work suggests that porous LaPO₄ ceramics have the potential to be applied as thermal insulation material in the future.

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一种新型且前景广阔的隔热材料：具有超低导热性和更高强度的单斜晶体型多孔 LaPO4 陶瓷

本研究首次采用颗粒稳定发泡法合成了具有闭合球形孔隙和薄孔壁的新型多孔 LaPO4 陶瓷。受煅烧温度和固体负载的影响，所获得的多孔 LaPO4 陶瓷具有较高的孔隙率（81.69%-94.21%）、极低的热导率（κ）（0.124-0.398 W-m-1-K-1）和相对较高的抗压强度（0.886-9.30 MPa）。当煅烧温度和固体含量分别为 1500 ℃ 和 35 wt% 时，优化的多孔 LaPO4 陶瓷在导热系数（0.160 W-m-1-K-1）和抗压强度（2.07 MPa）之间达到了较好的平衡。在此基础上，对导热系数的预测模型进行了筛选，并进一步验证了其隔热能力。这项研究表明，多孔 LaPO4 陶瓷在未来有可能被用作隔热材料。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.