(Me1/3Hf1/3Nb1/3)B2(Me=Ti, Zr, Ta)陶瓷的制备、显微结构和力学性能

许亮; 张岩; 张威; 郭伟明; 林华泰

doi:10.13801/j.cnki.fhclxb.20210906.002

(Me_1/3Hf_1/3Nb_1/3)B₂(Me=Ti, Zr, Ta)陶瓷的制备、显微结构和力学性能

doi: 10.13801/j.cnki.fhclxb.20210906.002

广东工业大学　机电工程学院，广州 510006

基金项目: 珠江新星项目(201710010142)

详细信息

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

中图分类号: TG148
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- 被引次数: 0
出版历程
- 收稿日期: 2021-07-07
- 修回日期: 2021-08-09
- 录用日期: 2021-08-20
- 网络出版日期: 2021-09-06
- 刊出日期: 2022-07-30

Fabrication, microstructure and mechanical properties of (Me_1/3Hf_1/3Nb_1/3)B₂(Me=Ti, Zr, Ta) ceramics

School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China

摘要

摘要: 以采用硼热/碳热还原反应自合成的(Me_1/3Hf_1/3Nb_1/3)B₂ (Me=Ti, Zr, Ta) 为原料，通过放电等离子烧结制备了(Me_1/3Hf_1/3Nb_1/3)B₂陶瓷，系统研究了其相组成、致密度、显微结构和力学性能。结果表明，(Ti_1/3Hf_1/3Nb_1/3)B₂和(Zr_1/3Hf_1/3Nb_1/3)B₂陶瓷具有较高的致密度(~98%)，而(Ta_1/3Hf_1/3Nb_1/3)B₂陶瓷的致密度较低(~93%)。(Ti_1/3Hf_1/3Nb_1/3)B₂的晶粒较粗，而(Zr_1/3Hf_1/3Nb_1/3)B₂和(Ta_1/3Hf_1/3Nb_1/3)B₂的晶粒相对较小，并且在(Ta_1/3Hf_1/3Nb_1/3)B₂中Nb元素出现局部偏析。(Ti_1/3Hf_1/3Nb_1/3)B₂陶瓷具有较优异的力学性能，硬度和韧性分别为(20.08±0.81) GPa和(2.52±0.15) MPa·m^1/2，而(Zr_1/3Hf_1/3Nb_1/3)B₂陶瓷的力学性能较差，硬度和断裂韧性分别为(17.21±0.63) GPa和(1.50±0.18) MPa·m^1/2。
- 硼热/碳热还原法 /
- 硼化物陶瓷 /
- 固溶 /
- 显微结构 /
- 力学性能
Abstract: With (Me_1/3Hf_1/3Nb_1/3)B₂ (Me=Ti, Zr, Ta) powders self-synthesized via boron/carbothermal reduction, (Me_1/3Hf_1/3Nb_1/3)B₂ ceramics were prepared by spark plasma sintering (SPS), and their phase composition, relative density, microstructure and mechanical properties were investigated systematically. The result reveals that (Ti_1/3Hf_1/3Nb_1/3)B₂ and (Zr_1/3Hf_1/3Nb_1/3)B₂ possess the high relative density (~98%), while (Ta_1/3Hf_1/3Nb_1/3)B₂ has the lowest relative density (~93%). (Ti_1/3Hf_1/3Nb_1/3)B₂ possesses relatively coarse grains, while (Zr_1/3Hf_1/3Nb_1/3)B₂ and (Ta_1/3Hf_1/3Nb_1/3)B₂possess relatively fine grains and Nb segregation is found in (Ta_1/3Hf_1/3Nb_1/3)B₂. (Ti_1/3Hf_1/3Nb_1/3)B₂ shows the most excellent mechanical properties with the Vickers hardness and fracture toughness of (20.08±0.81) GPa and (2.52±0.15) MPa·m^1/2, respectively, whereas the mechanical properties of (Zr_1/3Hf_1/3Nb_1/3)B₂ are inferior, with hardness and fracture toughness of (17.21±0.63) GPa and (1.50±0.18) MPa·m^1/2, respectively.
- boron/carbothermal reduction /
- diboride ceramics /
- solid solution /
- microstructure /
- mechanical properties

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图 1 2000℃烧结(Me_1/3Hf_1/3Nb_1/3)B₂ 陶瓷的XRD图谱：(a) (Ti_1/3Hf_1/3Nb_1/3)B₂；(b) (Zr_1/3Hf_1/3Nb_1/3)B₂；(c) (Ta_1/3Hf_1/3Nb_1/3)B₂

Figure 1. XRD patterns of (Me_1/3Hf_1/3Nb_1/3)B₂ ceramics sintered at 2000℃: (a) (Ti_1/3Hf_1/3Nb_1/3)B₂; (b) (Zr_1/3Hf_1/3Nb_1/3)B₂; (c) (Ta_1/3Hf_1/3Nb_1/3)B₂

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图 2 2000℃烧结(Me_1/3Hf_1/3Nb_1/3)B₂ 陶瓷SEM图像和相应的能谱元素图：(a) (Ti_1/3Hf_1/3Nb_1/3)B₂；(b) (Zr_1/3Hf_1/3Nb_1/3)B₂；(c) (Ta_1/3Hf_1/3Nb_1/3)B₂

Figure 2. SEM images and the corresponding EDS elemental mappings of (Me_1/3Hf_1/3Nb_1/3)B₂ ceramics sintered at 2000℃: (a) (Ti_1/3Hf_1/3Nb_1/3)B₂; (b) (Zr_1/3Hf_1/3Nb_1/3)B₂; (c) (Ta_1/3Hf_1/3Nb_1/3)B₂

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图 3 2000℃烧结(Me_1/3Hf_1/3Nb_1/3)B₂陶瓷材料腐蚀的SEM图像：(a) (Ti_1/3Hf_1/3Nb_1/3)B₂；(b) (Zr_1/3Hf_1/3Nb_1/3)B₂；(c) (Ta_1/3Hf_1/3Nb_1/3)B₂

Figure 3. SEM images of the polished surface of (Me_1/3Hf_1/3Nb_1/3)B₂ ceramics sintered at 2000℃ after acid etching: (a) (Ti_1/3Hf_1/3Nb_1/3)B₂; (b) (Zr_1/3Hf_1/3Nb_1/3)B₂; (c) (Ta_1/3Hf_1/3Nb_1/3)B₂

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图 4 2000℃烧结(Me_1/3Hf_1/3Nb_1/3)B₂ 陶瓷材料的裂纹扩展图像：(a) (Ti_1/3Hf_1/3Nb_1/3)B₂；(b) (Zr_1/3Hf_1/3Nb_1/3)B₂；(c) (Ta_1/3Hf_1/3Nb_1/3)B₂

Figure 4. Crack propagation images of (Me_1/3Hf_1/3Nb_1/3)B₂ ceramics sintered at 2000℃: (a) (Ti_1/3Hf_1/3Nb_1/3)B₂; (b) (Zr_1/3Hf_1/3Nb_1/3)B₂; (c) (Ta_1/3Hf_1/3Nb_1/3)B₂

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表 1 2000℃烧结(Me_1/3Hf_1/3Nb_1/3)B₂陶瓷的晶胞参数、相对密度、晶粒尺寸与力学性能

Table 1. Lattice parameters, relative density, grain size and mechanical properties of (Me_1/3Hf_1/3Nb_1/3)B₂ ceramics sintered at 2000℃

Code	a/nm	c/nm	Relative density/%	Grain size/μm	Hardness/ GPa	Fracture toughness/ (MPa·m^1/2)
(Ti_1/3Hf_1/3Nb_1/3)B₂	0.30919	0.33423	98.02	1.97±0.47	20.08±0.81	2.52±0.15
(Zr_1/3Hf_1/3Nb_1/3)B₂	0.31346	0.34384	98.35	1.67±0.43	17.21±0.63	1.50±0.18
(Ta_1/3Hf_1/3Nb_1/3)B₂	0.31076	0.33481	92.87	1.55±0.38	19.29±0.73	2.43±0.14
Notes: a and c—Lattice parameters of (Me_1/3Hf_1/3Nb_1/3)B₂ ceramics sintered at 2000℃.

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