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

黄梓键; 张岩; 郭伟明; 许亮; 张威

doi:10.13801/j.cnki.fhclxb.20210805.004

(Hf_0.2Zr_0.2Ta_0.2Ti_0.2Me_0.2)B₂(Me=V, W)高熵硼化物陶瓷的制备与性能

doi: 10.13801/j.cnki.fhclxb.20210805.004

广东工业大学机电工程学院，广州 510006

基金项目: 国家自然科学基金项目(52072077；51832002)；广东省珠江人才计划地方创新团队项目(2017BT01C169)

详细信息

通讯作者:
郭伟明，博士，教授，硕士生导师，研究方向为超高温陶瓷及其零部件　E-mail：guo1238@126.com

中图分类号: TG148
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出版历程
- 收稿日期: 2021-05-17
- 修回日期: 2021-06-21
- 录用日期: 2021-07-26
- 网络出版日期: 2021-08-05
- 刊出日期: 2022-03-23

Preparation and properties of (Hf_0.2Zr_0.2Ta_0.2Ti_0.2Me_0.2)B₂(Me=V, W) high entropy boride ceramics

School of Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou 510006, China

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(Hf_0.2Zr_0.2Ta_0.2Ti_0.2Me_0.2)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(Hf_0.2Zr_0.2Ta_0.2Ti_0.2Me_0.2)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(Hf_0.2Zr_0.2Ta_0.2V_0.2Ti_0.2)B₂形成了完全固溶体，但是(Hf_0.2Zr_0.2Ta_0.2W_0.2Ti_0.2)B₂样品中还检测到WB相。(Hf_0.2Zr_0.2Ta_0.2V_0.2Ti_0.2)B₂样品致密度(93.1%)低于(Hf_0.2Zr_0.2Ta_0.2W_0.2Ti_0.2)B₂(96.7%)，但其晶粒尺寸显著小于(Hf_0.2Zr_0.2Ta_0.2W_0.2Ti_0.2)B₂。(Hf_0.2Zr_0.2Ta_0.2W_0.2Ti_0.2)B₂具有较高的硬度(24.0 GPa)，但断裂韧性低于 (Hf_0.2Zr_0.2Ta_0.2V_0.2Ti_0.2)B₂(3.32 MPa·m^1/2)。
- 硼热/碳热还原法 /
- 高熵硼化物陶瓷 /
- 致密度 /
- 组织结构 /
- 力学性能
Abstract: In order to prepare high entropy boride ceramics with excellent performance, (Hf_0.2Zr_0.2Ta_0.2Ti_0.2Me_0.2)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 (Hf_0.2Zr_0.2Ta_0.2Ti_0.2Me_0.2)B₂(Me=V, W) high entropy boride ceramics were investigated. Results show that (Hf_0.2Zr_0.2Ta_0.2Ti_0.2Me_0.2)B₂(Me=V, W) high entropy boride powders are failed formed single-phase solid solution in 1600℃, but (Hf_0.2Zr_0.2Ta_0.2V_0.2Ti_0.2)B₂ is formed a complete solid solution after 2 000℃ sintering. However, WB phase is still detected in (Hf_0.2Zr_0.2Ta_0.2W_0.2Ti_0.2)B₂ sample. The density of (Hf_0.2Zr_0.2Ta_0.2V_0.2Ti_0.2)B₂(93.1%) is lower than that of (Hf_0.2Zr_0.2Ta_0.2W_0.2Ti_0.2)B₂(96.7%), but its grain size is smaller. The hardness of (Hf_0.2Zr_0.2Ta_0.2W_0.2Ti_0.2)B₂(24.0 GPa) is higher, but the fracture toughness is lower than that of (Hf_0.2Zr_0.2Ta_0.2V_0.2Ti_0.2)B₂ (3.32 MPa·m^1/2).
- boro/carbothermal reduction method /
- high entropy borides ceramic /
- relative density /
- microstructure /
- mechanical properties

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图 1 (Hf_0.2Zr_0.2Ta_0.2Ti_0.2Me_0.2)B₂ (Me=V, W)高熵陶瓷粉末的XRD图谱

Figure 1. XRD pattern of (Hf_0.2Zr_0.2Ta_0.2Ti_0.2Me_0.2)B₂ (Me=V, W) high-entropy boride powders

(a) (Hf_0.2Zr_0.2Ta_0.2V_0.2Ti_0.2)B₂; (b) (Hf_0.2Zr_0.2Ta_0.2W_0.2Ti_0.2)B₂; (c)(Hf_0.2Zr_0.2Ta_0.2V_0.2Ti_0.2)B₂; (d) (Hf_0.2Zr_0.2Ta_0.2W_0.2Ti_0.2)B₂

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图 2 (Hf_0.2Zr_0.2Ta_0.2Ti_0.2Me_0.2)B₂ (Me=V, W)高熵陶瓷粉末的SEM图像

Figure 2. SEM images of (Hf_0.2Zr_0.2Ta_0.2Ti_0.2Me_0.2)B₂ (Me=V, W) high-entropy boride powders

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图 3 (Hf_0.2Zr_0.2Ta_0.2Ti_0.2Me_0.2)B₂ (Me=V, W)抛光面腐蚀的形貌

Figure 3. Morphologies of polished and etched surface of (Hf_0.2Zr_0.2Ta_0.2Ti_0.2Me_0.2)B₂ (Me=V, W)

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图 4 高熵硼化物陶瓷的EDS面扫分布图像：(a) (Hf_0.2Zr_0.2Ta_0.2V_0.2Ti_0.2)B₂; (b) (Hf_0.2Zr_0.2Ta_0.2W_0.2Ti_0.2)B₂

Figure 4. EDS mapping of high-entropy boride ceramics: (a) (Hf_0.2Zr_0.2Ta_0.2V_0.2Ti_0.2)B₂; (b) (Hf_0.2Zr_0.2Ta_0.2W_0.2Ti_0.2)B₂

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图 5 高熵硼化物陶瓷的线扫分布图：(a) (Hf_0.2Zr_0.2Ta_0.2V_0.2Ti_0.2)B₂; (b) (Hf_0.2Zr_0.2Ta_0.2W_0.2Ti_0.2)B₂

Figure 5. EDS lining of high-entropy boride ceramics: (a) (Hf_0.2Zr_0.2Ta_0.2V_0.2Ti_0.2)B₂; (b) (Hf_0.2Zr_0.2Ta_0.2W_0.2Ti_0.2)B₂

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表 1 (Hf_0.2Zr_0.2Ta_0.2Ti_0.2Me_0.2)B₂ (Me=V, W)高熵陶瓷(HEB)粉末的成分、粒径、晶粒尺寸和致密度

Table 1. Composition, particle, grain size and relative density of (Hf_0.2Zr_0.2Ta_0.2Ti_0.2Me_0.2)B₂ (Me=V, W) high-entropy boride (HEB) powders

Composition	Particle size of HEB powders/μm	Grain size of HEB ceramics/μm	Relative density/%
(Hf_0.2Zr_0.2Ta_0.2V_0.2Ti_0.2)B₂	0.24±0.06	1.07±0.29	93.1±0.6
(Hf_0.2Zr_0.2Ta_0.2W_0.2Ti_0.2)B₂	0.22±0.06	1.83±0.39	96.7±0.9

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表 2 (Hf_0.2Zr_0.2Ta_0.2Ti_0.2Me_0.2)B₂(Me=V, W)高熵陶瓷以及与文献^{[14, 17, 26-27]}对比的力学性能

Table 2. Mechanical properties of (Hf_0.2Zr_0.2Ta_0.2Ti_0.2Me_0.2)B₂ (Me=V, W) high-entropy boride ceramics compared with literature^{[14, 17, 26-27]}

Composition	Hardness/GPa	Fracture toughness/ (MPa·m^1/2)
(Hf_0.2Zr_0.2Ta_0.2V_0.2Ti_0.2)B₂	22.9±1.2	3.32±0.44
(Hf_0.2Zr_0.2Ta_0.2W_0.2Ti_0.2)B₂	24.0±1.6	2.92±0.22
(Hf_0.2Zr_0.2Ta_0.2Nb_0.2Ti_0.2)B₂^[14]	17.5	−
(Hf_0.2Zr_0.2Ta_0.2Nb_0.2Ti_0.2)B₂^[17]	21.7	4.06
HfB₂^[26]	18.1	3.5
ZrB₂^[27]	23	3.5

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