高强低热导纯相多孔ZrB<sub>2</sub>陶瓷的松装烧结制备及性能

doi:10.19976/j.cnki.43-1448/TF.2025041

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Abstract Although traditional pressure-assisted sintering techniques at high temperature and the use of sintering aids can improve the formability of ZrB₂ ceramics, they often cause an increase in the thermal conductivity or a decrease in high-temperature strength, hindering synergistic optimization of mechanical properties and thermal insulation performance. Here, pure-phase porous ZrB₂ ceramics were fabricated via loose-pack sintering using ZrB₂ raw powders with different particle size ratios. The effects of the raw powder size ratio on the microstructure, compressive performance, and thermal conductivity were investigated using X-ray diffractometer, scanning electron microscope, and computed tomography. The sintering forming, strengthening, and thermal insulation mechanisms of ceramics were elucidated. Results indicate that the porosity of loose-pack sintered ZrB₂ ceramics ranges from 43.42% to 46.68% across different particle size ratios. At a fine-to-coarse powder mass ratio of 1:9, the ceramic develops a robust ZrB₂ skeleton and a uniform dual-scale pore network at the micrometer level, achieving a high compressive strength of 364.70 MPa and a low thermal conductivity of only 32.79 W/(m·K). During sintering, moderate fine powders effectively reinforce the skeleton formed by coarse powders, facilitating a uniform microstructure evolution. The connected and isolated pores establish a gradient energy dissipation and defense mechanism, which synergize with the robust ZrB₂ skeleton to ensure excellent compressive performance. Meanwhile, effective thermal insulation results from blocked solid conduction, prolonged gaseous heat transfer paths, induced Knudsen effect via pore structure, and enhanced phonon scattering at high-density large-angle grain boundaries.

Key words： porous ceramic ZrB₂ thermal conductivity compressive strength loose-pack sintering

Received: 28 April 2025 Published: 06 January 2026

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	GAO Meng
	HU Jinrun
	LI Tianyou
	WANG Bingjun
	WANG Yichen
	JIANG Fengze
	ZENG Yi

Cite this article:

GAO Meng,HU Jinrun,LI Tianyou, et al. Loose-pack sintering preparation and properties of high-strength, low-thermal-conductivity pure-phase porous ZrB₂ ceramics[J]. Materials Science and Engineering of Powder Metallurgy, 2025, 30(6): 502-513.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2025041 OR http://pmbjb.csu.edu.cn/EN/Y2025/V30/I6/502

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