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(Hf0.2Zr0.2Ta0.2Ti0.2Me0.2)B2(Me=V, W)高熵硼化物陶瓷的制备与性能

Preparation and properties of (Hf0.2Zr0.2Ta0.2Ti0.2Me0.2)B2(Me=V, W) high entropy boride ceramics

    摘要
  • 摘要: 为了制备性能优异的高熵硼化物陶瓷，通过硼热/碳热还原法与放电等离子烧结技术 (SPS) 结合制备(Hf0.2Zr0.2Ta0.2Ti0.2Me0.2)B2(Me=V, W) 高熵硼化物陶瓷，研究V和W对高熵硼化物陶瓷物相组成、形貌和力学性能的影响。结果表明，在1600℃合成的(Hf0.2Zr0.2Ta0.2Ti0.2Me0.2)B2(Me=V, W)高熵硼化物粉末均未形成单相固溶体，经2000℃烧结后(Hf0.2Zr0.2Ta0.2V0.2Ti0.2)B2形成了完全固溶体，但是(Hf0.2Zr0.2Ta0.2W0.2Ti0.2)B2样品中还检测到WB相。(Hf0.2Zr0.2Ta0.2V0.2Ti0.2)B2样品致密度(93.1%)低于(Hf0.2Zr0.2Ta0.2W0.2Ti0.2)B2(96.7%)，但其晶粒尺寸显著小于(Hf0.2Zr0.2Ta0.2W0.2Ti0.2)B2。(Hf0.2Zr0.2Ta0.2W0.2Ti0.2)B2具有较高的硬度(24.0 GPa)，但断裂韧性低于 (Hf0.2Zr0.2Ta0.2V0.2Ti0.2)B2(3.32 MPa·m1/2)。

     

    Abstract: In order to prepare high entropy boride ceramics with excellent performance, (Hf0.2Zr0.2Ta0.2Ti0.2Me0.2)B2(Me=V, W) high entropy boride ceramics were fabricated though boro/carbothermal reduction method combined with spark plasma sintering (SPS) in this paper. The effects of V and W on phase composition, morphology and mechanical properties of (Hf0.2Zr0.2Ta0.2Ti0.2Me0.2)B2(Me=V, W) high entropy boride ceramics were investigated. Results show that (Hf0.2Zr0.2Ta0.2Ti0.2Me0.2)B2(Me=V, W) high entropy boride powders are failed formed single-phase solid solution in 1600℃, but (Hf0.2Zr0.2Ta0.2V0.2Ti0.2)B2 is formed a complete solid solution after 2 000℃ sintering. However, WB phase is still detected in (Hf0.2Zr0.2Ta0.2W0.2Ti0.2)B2 sample. The density of (Hf0.2Zr0.2Ta0.2V0.2Ti0.2)B2(93.1%) is lower than that of (Hf0.2Zr0.2Ta0.2W0.2Ti0.2)B2(96.7%), but its grain size is smaller. The hardness of (Hf0.2Zr0.2Ta0.2W0.2Ti0.2)B2(24.0 GPa) is higher, but the fracture toughness is lower than that of (Hf0.2Zr0.2Ta0.2V0.2Ti0.2)B2 (3.32 MPa·m1/2).

     

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