Effects of HfN content on microstructure and mechanical properties of ZrB2-HfN ceramic materials
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摘要: 以HfN为增强剂、Ni为金属添加剂, 通过真空热压烧结工艺制备了ZrB2-HfN陶瓷材料, 研究了HfN含量(质量分数)对ZrB2基陶瓷材料微观组织和力学性能的影响。结果表明: 随着HfN质量分数从5%增加到15%, ZrB2-HfN陶瓷材料的硬度和抗弯强度先增大后减小, 而断裂韧度逐渐增大; 当HfN质量分数为15%时, ZrB2-HfN陶瓷材料的断裂模式为穿晶断裂与沿晶断裂共存; 当HfN含量为10%时, ZrB2-HfN陶瓷材料具有较好的综合力学性能, 其硬度、抗弯强度和断裂韧度分别为: (16.47±0.24) GPa、(734.48±25) MPa和(5.37±0.20) MPa·m 1/2。Abstract: ZrB2 -HfN ceramic materials were fabricated by the vacuum hot-pressing sintering, and the influence of HfN content by mass on the microstructure and mechanical properties of the ZrB2 -HfN ceramic materials was studied. The results show that, with the HfN content by mass increasing from 5% to 15%, the Vickers hardness and flexural strength of the ZrB2 -HfN ceramic materials first increase and then decrease, while the fracture toughness increase gradually. When the content of HfN is 15%, the fracture mode ofZrB2 -HfN ceramic material is the coexistence of transgranular fracture and intergranular fracture. When the content of HfN is 10%, the ZrB2 -HfN ceramic material obtains the better mechanical properties, and the hardness, flexural strength, and fracture toughness are(16.47±0.24) GPa, (734.48±25) MPa, and (5.37±0.20) MPa·m 1/2, respectively.
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图 1 添加不同质量分数HfN的ZrB2–HfN陶瓷材料X射线衍射图谱
Figure 1. XRD patterns of ZrB2–HfN ceramic materials with different HfN content by mass
图 2 ZrB2–HfN陶瓷材料的抛光面扫描电子显微形貌以及对应图 2（c）中不同位置的能谱分析图：（a）ZH1显微形貌；（b）ZH2显微形貌；（c）ZH3显微形貌；（d）图 2（c）A点能谱；（e）图 2（c）B点能谱；（f）图 2（c）C点能谱；
Figure 2. Surface SEM images of the ZrB2–HfN ceramic materials and the corresponding EDS: (a) ZH1 SEM image; (b) ZH2 SEM image; (c) ZH3 SEM image; (d) EDS of point A in Fig. 2(c); (e) EDS of point B in Fig. 2(c); (f) EDS of point C in Fig. 2(c)
图 3 添加不同质量分数HfN的ZrB2–HfN陶瓷材料断口形貌图：（a）ZH1；（b）ZH2；（c）ZH3
Figure 3. Fracture morphologies of ZrB2–HfN ceramic materials with different HfN contents by mass: (a) ZH1; (b) ZH2; (c) ZH3
表 1 ZrB2–HfN陶瓷材料的组分及配比（质量分数）
Table 1. Compositions of ZrB2–HfN ceramic materials
% 编号 ZrB2 HfN Ni ZH1 87 5 8 ZH2 82 10 8 ZH3 77 15 8 
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表 2 ZrB2–HfN陶瓷材料的相对密度和力学性能
Table 2. Relative densities and mechanical properties of ZrB2–HfN ceramic materials
编号 相对密度/ % 维氏硬度/ GPa 抗弯强度/ MPa 断裂韧度/ (MPa·m1/2) ZH1 99.4 ± 0.2 15.08 ± 0.20 422.96 ± 23 4.67 ± 0.22 ZH2 99.3 ± 0.1 16.47 ± 0.24 734.48 ± 25 5.37 ± 0.20 ZH3 99.1 ± 0.3 14.67 ± 0.23 540.46 ± 21 5.81 ± 0.15
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