高压物理学报2025，Vol.39Issue(12)：1-9,9.DOI:10.11858/gywlxb.20251060
高温高压下氮化硅的相变与力学性能调控
Phase Transition and Mechanical Property Modulation of Silicon Nitride at High Temperature and High Pressure
摘要
Abstract
Silicon nitride(Si3N4)ceramics are a novel category of structural ceramics,exhibiting both high reliability and economy value due to their unique physical and chemical properties.However,their strong covalent bonds make densification challenging,and phase transition control remains an issue.In this study,high temperature and high pressure(HTHP)sintering was utilized in combination with MgO-Y2O3 binary additives(mass ratio Si3N4∶MgO∶Y2O3=94∶3∶3)to achieve a synergistic sintering process involving both high pressure and liquid-phase formation.The effects of binary sintering additives on the sintering process,phase transition behavior,microscopic morphology and mechanical properties of Si3N4 under high pressure were systematically investigated by designing a two-layer comparative experimental assembly to ensure the same sintering temperature.The results show that the MgO-Y2O3 promotes the α→β phase transformation of Si3N4 through liquid phase formation,which reduces the phase transition onset temperature from 1800℃to 1650℃.Furthermore,high pressure enhances grain rearrangement and densification.As a result,highly dense Si3N4 ceramics with an optimal Vickers hardness up to(24.5±1.9)GPa were successfully synthesized.These findings provide an effective strategy for preparing high-performance Si3N4 ceramics and hold significant implications for advancements in physics and material science.关键词
高温高压/氮化硅陶瓷/维氏硬度/致密度/相变Key words
high temperature and high pressure/silicon nitride ceramics/Vickers hardness/densification/phase transition分类
数理科学引用本文复制引用
崔思雯,李世新,马帅领,连敏,赵行斌,陶强,朱品文..高温高压下氮化硅的相变与力学性能调控[J].高压物理学报,2025,39(12):1-9,9.基金项目
国家自然科学基金(12204254,52072188) （12204254,52072188）
浙江省自然科学基金(LQ23A040005) （LQ23A040005）
浙江省科技创新团队计划(2021R010,2021R01004) （2021R010,2021R01004）
