硅酸盐学报2026，Vol.54Issue(4)：1245-1256,12.DOI:10.14062/j.issn.0454-5648.20250846
超高温复相陶瓷多层级固溶微结构及烧结熔体调控:回顾与前瞻
Control of Hierarchical Solid-solution Microstructures by Sintering Melt for Ultra-high-temperature Multiphase Ceramics:Retrospect and Prospect
摘要
Abstract
ZrB2-based multiphase ceramics are representative ultra-high temperature ceramics(UHTCs).Their service temperature significantly exceeds the sintering temperature,often requiring substantial amounts of SiC as a sintering aid to achieve the densification and enhance the oxidation resistance.The transition metal carbides(MCs)are superior sintering aids for UHTCs,effectively removing the oxygen-impurity and improving high-temperature strength.From some projects supported from the National Natural Science Foundation of China,our studies focus on the effect of MC on controlling the multiphase microstructure of UHTCs.The results obtained reveal the reactive-sintering mechanism engaging the high-viscous liquid-phase and explore the mutual-solution behavior in multiphase ceramics along with the structure-property relationship.The quantitative characterization for microstructures indicates the dominance of bora-carbide sintering-melts on reactive-sintering and densification,and on regulating the multi-level evolution of high-solution microstructures.MC additives are transformed into ZrC grain boundary phases via the sintering-melt,and its exchange-reaction with the primary phase governs the multiphase relationship.The melt as a transient liquid enables a bi-solubility of M to create prevalent core-rim structures.In the later stages of sintering,ZrC second-phase precipitates with a higher solubility of M. Summary and Prospects The multi-levelled control of multiphase microstructures by the reactive-melt is analogous to"dissolution-reprecipitation"process for liquid-phase sintering in the transformable microstructures of silicon-based ceramics,with silicate-melts and glassy phases at grain boundaries.In contrast to the monolithic ceramics of high-entropy MB2 and MC,the multi-levelled solid-solutions and the associated multiphase microstructures of MIB2-MIIC UHTCs offer ample and novel routes for comprehensive control,better optimization and further enhancement in high-performance UHTCs.The coherent hetero-interfaces created from the multi-levelled solutions via solid-state phase-separations and their interconnected dislocation networks can further improve the high-temperature strength,and those phase-boundaries,grain-boundaries,and solute-segregates allow a precise control over the multiscale semi-coherent microstructures.The research on this synergistic evolution of intergranular phases and sintering-melts at high temperatures along with the multiphase transformation has a promising potential for future advancements in ceramic genomes and levelled structure-property relationship for multiphase UHTCs governed by solid-solutions as enthalpy-regulation.关键词
超高温陶瓷/烧结熔体/核-周结构/多层级固溶微结构Key words
ultra-high-temperature ceramics/sintering melt/core-rim structures/hierarchical solid-solution microstructures分类
通用工业技术引用本文复制引用
顾辉,齐马林,胡冬力,郑强,邹冀,霍思嘉,王玉金..超高温复相陶瓷多层级固溶微结构及烧结熔体调控:回顾与前瞻[J].硅酸盐学报,2026,54(4):1245-1256,12.基金项目
国家自然科学基金项目(52032002,51532006,50632070) （52032002,51532006,50632070）
国家重点研发计划课题(2022YFB3707700). （2022YFB3707700）
