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Novel cermets based on vanadium oxycarbide with Co and Fe binders
International Journal of Refractory Metals & Hard Materials ( IF 3.6 ) Pub Date : 2022-07-18 , DOI: 10.1016/j.ijrmhm.2022.105953
Anna Shelyug , Arseniy Bokov , Alexey Kurlov

This paper shows the ability of vanadium oxycarbide to form a hard phase within metallic binder (VCxOy-Co and VCxOy-Fe cermets) in a wide range of compositions (x = 0.1–0.9 and y = 0.2–0.5). Pellets of VCxOy-Co were densified during heating to 1450 °C and VCxOy-Fe to 1485 °C under argon flow without dwell. Obtained microstructures represented 3–11 μm grains of VCxOy surrounded by 12–18 vol% of binder, with relative density of 71–94% for VCxOy-Co and 84–96% for VCxOy-Fe, and having the average hardness of 10–13 GPa. Although the samples with more oxygen than carbon had smaller ceramic grains, too little carbon resulted in secondary phase. Higher carbon content provided the ordered V8C7 and V6C5 phases that made sintered cermets significantly harder in spite of residual porosity. Overall, iron-containing samples had a stronger ceramic-metal interface than cobalt samples based on fracture behavior.



中文翻译:

基于碳氧化钒与 Co 和 Fe 粘合剂的新型金属陶瓷

本文展示了钒碳氧化物在金属粘合剂(VC x O y -Co 和 VC x O y -Fe 金属陶瓷)中形成硬质相的能力,范围很广(x = 0.1–0.9 和 y = 0.2–0.5 )。VC x O y -Co球团在加热至 1450 °C 和 VC x O y -Fe 至 1485 °C 期间在氩气流下无停留致密化。获得的微观结构代表 3-11 μm 的 VC x O y晶粒,被 12-18 vol% 的粘合剂包围,VC x O y -Co 的相对密度为 71-94%,VC x O y相对密度为84-96%-Fe,平均硬度为 10-13 GPa。尽管氧比碳多的样品具有较小的陶瓷颗粒,但碳太少会导致第二相。较高的碳含量提供了有序的 V 8 C 7和 V 6 C 5相,这使得烧结金属陶瓷显着更硬,尽管存在残余孔隙率。总体而言,基于断裂行为,含铁样品的陶瓷-金属界面比钴样品更强。

更新日期:2022-07-18
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