Abstract In this study, nonstoichiometric hafnium carbonitrides (HfCxNy) were fabricated via short-term (5 min) high-energy ball milling of Hf and C powders, followed by combustion of mechanically induced Hf/C composite particles in a nitrogen atmosphere (0.8 MPa). The obtained HfC0.5N0.35 powder exhibited a rock-salt crystal structure with a lattice parameter of 0.4606 nm. The melting point of this synthesized ceramic material was experimentally shown to be higher than that of binary hafnium carbide (HfC). The nonstoichiometric hafnium carbonitride was then consolidated under a constant pressure of 50 MPa at a temperature of 2000 °C and a dwelling time of 10 min, through spark plasma sintering. The obtained bulk ceramic material had a theoretical material density of 98%, Vickers hardness of 21.3 GPa, and fracture toughness of 4.7 MPa m1/2.

中文翻译：

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通过燃烧合成和放电等离子烧结制备超高温非化学计量碳氮化铪

摘要 在本研究中，通过对 Hf 和 C 粉末进行短期（5 分钟）高能球磨，然后在氮气气氛 (0.8 MPa) 中机械诱导的 Hf/C 复合颗粒燃烧，制备了非化学计量的碳氮化铪 (HfCxNy)。 ）。得到的HfC0.5N0.35粉体呈岩盐晶体结构，晶格参数为0.4606nm。实验表明，这种合成陶瓷材料的熔点高于二元碳化铪 (HfC) 的熔点。非化学计量的碳氮化铪然后在 50 MPa 的恒压下，在 2000 °C 的温度和 10 分钟的停留时间下通过放电等离子烧结进行固结。所得块状陶瓷材料的理论材料密度为98%，维氏硬度为21.3 GPa，断裂韧性为4.7 MPa m1/2。