Effects of Sintering Additives on Microstructure and Mechanical Properties of Hot-Pressed alpha-SiC Ceramics
文献类型：期刊论文
| 作者 | Zhu, Yabin1,2 ; Qin, Zixuan3,4; Chai, Jianlong1,2; Shen, Tielong1,2; Zhou, Youfu3,4; Wang, Zhiguang1,2
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| 刊名 | METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
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| 出版日期 | 2022-04-01 |
| 卷号 | 53期号:4页码:1188-1199 |
| ISSN号 | 1073-5623 |
| DOI | 10.1007/s11661-021-06554-5 |
| 通讯作者 | Shen, Tielong(shentielong@impcas.ac.cn) |
| 英文摘要 | In this work, alpha-SiC ceramics with aluminum or yttria sintering additives ranging from 1.0 to 4.0 wt pct were prepared by hot pressing, and the effect of sintering additives on the microstructure and mechanical properties of SiC ceramics was investigated. Specimens with Al additive exhibited fully dense microstructure with relative density > 99.4 pct. However, the relative density of specimens with Y2O3 decreases constantly from 99.5 to 95.7 pct as Y2O3 content increases, which is possibly due to the formation of gaseous phase and evaporation of volatile compounds resulting from the chemical reaction between SiC matrix and Y2O3 additive. X-ray diffraction (XRD) and Raman spectra results showed that Al addition leads to the transformation from 6H to 4H polytypes, and the transformation degree increases as increasing the Al content, while no obvious polytype transformation is observed for specimens with Y2O3 additive. Scanning electron microscopy (SEM) observations revealed that specimens with Y2O3 are composed of equiaxed grains with average size about 1.0 mu m, whereas the specimens with Al additive exhibit larger grain size with partly elongated grain structure. Additionally, it is found that the grain growth of specimens with Al addition is accompanied by the polytype transformation. Further analysis revealed that, for specimens with Al additive, enhanced grain size and formation of elongated of SiC grains lead to an improvement in fracture toughness from 5.7 to 7.1 MPa m(1/2) but a slight decline in flexural strength from 706 to 632 MPa. The crack deflection and bridging as well as undesirable stress effects related to the large elongated grains are responsible for the variation in mechanical properties. In the case of SiC sintered with Y2O3, there are obvious declines in flexural strength and fracture toughness from 714 to 492 MPa and from 5.9 to 3.4 MPa m(1/2), respectively, which are mainly attributed to the increased porosity. The impact of Al and Y2O3 on the microstructure and mechanical properties of SiC ceramics was discussed. (C) The Minerals, Metals & Materials Society and ASM International 2022 |
| WOS关键词 | SILICON-CARBIDE CERAMICS ; FRACTURE-TOUGHNESS ; ELECTRICAL-PROPERTIES ; TEMPERATURE STRENGTH ; GRAIN-GROWTH ; PHASE ; ALUMINUM ; AL2O3 ; Y2O3 ; COMPOSITES |
| 资助项目 | National Natural Science Foundation of China[11505247] ; National Natural Science Foundation of China[U1832206] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA21010202] ; Program of the Innovation Center of Nuclear Materials for National Defense Industry of China[ICNM-2021-ZH-09] |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| 出版者 | SPRINGER |
| WOS记录号 | WOS:000757742400001 |
| 资助机构 | National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Program of the Innovation Center of Nuclear Materials for National Defense Industry of China |
| 源URL | [http://119.78.100.186/handle/113462/142038]  |
| 专题 | 中国科学院近代物理研究所 |
| 通讯作者 | Shen, Tielong |
| 作者单位 | 1.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China 2.Univ Chinese Acad Sci, Sch Nucl Sci & Technol, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Fujian Inst Res Struct Matter, Key Lab Optoelect Mat Chem & Phys, Fuzhou 350002, Peoples R China 4.Fujian Sci & Technol Innovat Lab Optoelect Inform, Fuzhou 350108, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhu, Yabin,Qin, Zixuan,Chai, Jianlong,et al. Effects of Sintering Additives on Microstructure and Mechanical Properties of Hot-Pressed alpha-SiC Ceramics[J]. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,2022,53(4):1188-1199. |
| APA | Zhu, Yabin,Qin, Zixuan,Chai, Jianlong,Shen, Tielong,Zhou, Youfu,&Wang, Zhiguang.(2022).Effects of Sintering Additives on Microstructure and Mechanical Properties of Hot-Pressed alpha-SiC Ceramics.METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,53(4),1188-1199. |
| MLA | Zhu, Yabin,et al."Effects of Sintering Additives on Microstructure and Mechanical Properties of Hot-Pressed alpha-SiC Ceramics".METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 53.4(2022):1188-1199. |
入库方式： OAI收割
来源：近代物理研究所
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