| 于长新,王发刚,尹凯俐,纪文义,刘新超,魏春城.弱界面层方向性对层状ZrB2-SiC/石墨陶瓷的影响[J].材料导报,2018,32(12):2047-2050 |
| 弱界面层方向性对层状ZrB2-SiC/石墨陶瓷的影响 |
| Effect of the Directivity of Weak Interfacial Layer on the Laminated ZrB2-SiC/Graphite Ceramics |
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| DOI：10.11896/j.issn.1005-023X.2018.12.020 |
| 中文关键词: 层状结构 ZrB2-SiC陶瓷 石墨弱界面层 方向性 力学性能 |
| 英文关键词: laminated structure, ZrB2-SiC ceramic, weak graphite layer, directivity, mechanical properties |
| 基金项目:山东省自然科学基金(ZR2014JL032);山东省高等学校科技项目(J16LA05) |
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| 摘要点击次数: 1947 |
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| 中文摘要: |
| 利用流延-叠层-热压烧结工艺制备层状ZrB2-SiC/石墨(ZrB2-SiC/G)陶瓷,研究了石墨弱界面层的方向性对其力学性能的影响；通过XRD、SEM等对层状ZrB2-SiC/G陶瓷的物相、形貌进行观察分析。结果表明:层状ZrB2-SiC/G陶瓷在平行方向上的弯曲强度为(382±25) MPa,略低于垂直方向的弯曲强度((429±30) MPa)；平行方向的断裂韧性为(11.2±0.3) MPa·m1/2,比垂直方向的断裂韧性提高了75%。层状ZrB2-SiC/G陶瓷在平行方向上的断裂韧性的提高主要是由于石墨弱界面层对裂纹的偏转、分叉和脱层作用。 |
| 英文摘要: |
| Laminated ZrB2-SiC/G graphite (ZrB2-SiC/G) ceramics were fabricated by tap-casting, stacking and hot-pressing sintering. The effect of directivity of weak graphite layer on the laminated ZrB2-SiC/G ceramics was investigated. The phase composition and morphology of the laminated ZrB2-SiC/G ceramics was analyzed and observed by XRD and SEM, respectively. The results show that the flexural strength in the parallel direction of the laminated ZrB2-SiC/G ceramics is (382±25) MPa, which is slightly lower than that of (429±30) MPa in the perpendicular direction. The fracture toughness in the parallel direction is (11.2±0.3) MPa·m1/2, which increases by 75% compared with that in the perpendicular direction. The increase of fracture toughness of the laminated ZrB2-SiC/G ceramics in the parallel direction is mainly attributed to the crack deflection, branching and delamination caused by graphite layer. |
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