| 引用本文: | 付连生,付莹,张瑞祥,马征,于占东,陈国清.Y2O3添加量对Al2O3/ZrO2共晶陶瓷显微组织及力学性能的影响[J].材料科学与工艺,2023,31(4):87-96.DOI:10.11951/j.issn.1005-0299.20220229. |
| FU Liansheng,FU Ying,ZHANG Ruixiang,MA Zheng,YU Zhandong,CHEN Guoqing.Influence of Y2O3 addition on the microstructure and mechanical properties of Al2O3-ZrO2 eutectic ceramic[J].Materials Science and Technology,2023,31(4):87-96.DOI:10.11951/j.issn.1005-0299.20220229. |
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| Y2O3添加量对Al2O3/ZrO2共晶陶瓷显微组织及力学性能的影响 |
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付连生1,付莹2,张瑞祥2,马征3,于占东3, 陈国清4
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(1.渤海大学 化学与材料工程学院,辽宁 锦州 121013; 2.松山湖材料实验室,广东 东莞 523000;3.渤海大学 控制科学与工程学院,辽宁 锦州 121013; 4.大连理工大学 材料科学与工程学院,辽宁 大连 116085)
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| 摘要: |
| 为探索第三组元Y2O3添加对Al2O3/ZrO2共晶陶瓷显微组织与机械性能的影响,本文利用低温度梯度的高温熔凝法制备了直径为20 mm的Al2O3/ZrO2(Y2O3)共晶陶瓷块体,采用SEM、EDS及XRD技术对共晶陶瓷进行微结构分析,并利用维氏压痕法对其硬度和断裂韧性进行测试。SEM结果表明,凝固组织由群集的共晶团结构组成,随着Y2O3添加量的增加,共晶团形态由胞状转变为枝晶状,内部相间距在1~2 μm范围内变化。力学测试表明,Y2O3摩尔分数小于1.1%时,由于组织内部存在低硬度m-ZrO2及微裂纹缺陷,故陶瓷硬度较低,约为(9.53±0.22 )GPa；当Y2O3摩尔分数为1.1%时,陶瓷硬度最大,约为(18.05±0.27)GPa；当Y2O3的摩尔分数大于1.1%时,由于共晶团边界区内气孔缺陷及粗大组织增多,引起陶瓷硬度值略有下降。低Y2O3摩尔分数添加时,陶瓷断裂韧性相对较高,约为(6.30±0.16)MPa·m1/2,这与其内部存在大量微裂纹缺陷有关；随着Y2O3添加量的增加,陶瓷的微裂纹数量减少、边界区内缺陷增多,断裂韧性降低。 |
| 关键词: 共晶陶瓷 力学性能 Al2O3/ZrO2(Y2O3) 微观组织 |
| DOI：10.11951/j.issn.1005-0299.20220229 |
| 分类号:TB39;TB35 |
| 文献标识码:A |
| 基金项目:辽宁省博士科研启动基金计划项目(2020-BS-235)；2021年辽宁省第四批科技计划定向项目(2021JH2/10100012)；国家自然科学基金面上项目(61673071)；2020年度辽宁省高等学校创新人才支持计划项目；渤海大学校博士启动基金项目(0521bs028). |
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| Influence of Y2O3 addition on the microstructure and mechanical properties of Al2O3-ZrO2 eutectic ceramic |
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FU Liansheng1, FU Ying2, ZHANG Ruixiang2, MA Zheng3, YU Zhandong3, CHEN Guoqing4
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(1.College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121003, China; 2.Songshan Lake Materials Laboratory, Dongguan 523000, China; 3.College of Control Science and Engineering, Bohai University, Jinzhou 121003, China; 4.School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, China)
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| Abstract: |
| Melt-grown Al2O3/ZrO2(Y2O3) eutectic bulks with a diameter of 20 mm were prepared by the high temperature melting method with a modest thermal gradient. The influence of Y2O3 content on the characteristics of the microstructure and the related mechanical properties were investigated. The microstructure analysis was conducted by the SEM, EDS and XRD techniques. The hardness and fracture toughness were determined by an indentation technique. SEM analysis indicates that the as-solidified structure in all samples is composed of a colony structure. When the Y2O3 content increases, the colony morphology changes obviously from cellular into the dendritic shape, and the average interphase spacing λ inside the colony varies in a range of 1~2 μm. Mechanical test results show that the eutectic without the Y2O3 addition exhibits a lower hardness (9.53±0.22) GPa. When Y2O3 is added, the hardness increases, reaching the maximum approximately(18.05±0.27) GPa at 1.1mol% of Y2O3. Apparently, Y2O3 addition tends to decrease the amount of m-ZrO2 phase with a low hardness and the number of microcracks. As the Y2O3 content is greater than 1.1mol%, the hardness decreases slightly due to the fact that porosity gathered at the inter-colony area increases with a higher Y2O3 content. The fracture toughness decreases with the increase of Y2O3 content. The sample with a lower Y2O3 content exhibited a higher fracture toughness≈(6.30±0.16 )MPa·m1/2 probably dependent on the microcrack toughening. A higher Y2O3 content addition may give rise to the increase of pore defects and coarse particles located the inter-colony regions, leading to the decline of the fracture toughness KIC. |
| Key words: eutectic ceramic mechanical properties Al2O3/ZrO2(Y2O3) microstructure |
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