Boron nitride nanosheets as an effective strategy against the slow crack growth and hydrothermal ageing in zirconia composites

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics Pub Date : 2025-06-10 DOI:10.1016/j.oceram.2025.100816

C. Muñoz-Ferreiro , A. Morales-Rodríguez , H. Reveron , E. Guisado-Arenas , S. Cottrino , P. Moreno , J. Prada-Rodrigo , J. Chevalier , Á. Gallardo-López , R. Poyato

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Abstract

This paper explores the effectiveness of boron nitride nanosheets in preventing the premature failure of yttria-stabilized tetragonal zirconia ceramics, particularly in humid environments. A simple, low-cost and scalable technique -shear exfoliation in a kitchen blender- was used to prepare BNNS, and pure zirconia and composites with 1, 2.5 and 5 vol. % BNNS were spark plasma sintered. Accelerated hydrothermal ageing experiments in autoclave revealed a remarkable improvement of low temperature degradation resistance in all the composites. Fracture toughness and slow crack growth of the composites with 1 and 2.5 vol. % BNNS were evaluated by bending tests performed in notched specimens. Although the composites presented fracture toughness values similar to those of the reference zirconia, an increase of ∼18 % on crack-tip toughness was achieved. Similar R-curves evaluated in air and in oil-impregnated 2.5 vol. % BNNS composites revealed a limitation of stress-assisted corrosion by water in zirconia, thanks to the BNNS incorporation.

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氮化硼纳米片作为抗氧化锆复合材料缓慢裂纹扩展和水热老化的有效策略

本文探讨了氮化硼纳米片在防止钇稳定的四方氧化锆陶瓷过早失效方面的有效性，特别是在潮湿环境中。采用一种简单、低成本和可扩展的技术——在厨房搅拌器中剪切剥落——制备了BNNS，并对含有1、2.5和5 vol. % BNNS的纯氧化锆和复合材料进行了火花等离子烧结。热压釜加速水热老化实验表明，复合材料的耐低温降解性能显著提高。在缺口试样上进行弯曲试验，评价了含1和2.5体积% BNNS的复合材料的断裂韧性和缓慢裂纹扩展。虽然复合材料的断裂韧性值与参考氧化锆相似，但裂纹尖端韧性提高了~ 18%。在空气和油浸渍2.5 vol. %的BNNS复合材料中评估的相似r曲线显示，由于BNNS的掺入，氧化锆中水的应力辅助腐蚀受到限制。

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