{"title":"反应热压TiB2-SiC-Ni陶瓷复合材料的力学性能及强化增韧机理","authors":"G. Zhao, C. Huang, N. He, H. Liu","doi":"10.4416/JCST2016-00110","DOIUrl":null,"url":null,"abstract":"A TiB2-SiC-5 wt %Ni ceramic composite with high flexural strength and fracture toughness was fabricated in the reactive hot pressing (RHP) process. Different sintering times and sintering temperatures were employed. The strengthening and toughening mechanisms were investigated in detail. The composition and microstructure were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM) and energy-dispersive spectroscopy (EDS). The sintering time and sintering temperature had a significant influence on the mechanical properties and microstructure of the composite. The mechanical properties decreased as the sintering time was increased from 30 to 45 min, and subsequently increased with the further increase of the sintering time. The mechanical properties of the composite increased gradually as the sintering temperature increased. For the investigated range of parameters, the composite prepared at 1700 °C for 30 min had the optimum comprehensive mechanical properties with flexural strength of 1121 ± 31 MPa, fracture toughness of 7.9 ± 0.58 MPa⋅m1/2 and hardness of 21.3 ± 0.62 GPa. The improved flexural strength and fracture toughness of the composite were attributed to the strengthening and toughening effects of Ni and the elongated TiB2 grains, the intragranular nano-particle structure, and the dislocations and stacking fault. The clean interface is also conducive to the improved flexural strength.","PeriodicalId":48807,"journal":{"name":"Journal of Ceramic Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.5000,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"6","resultStr":"{\"title\":\"Mechanical Properties, Strengthening and Toughening Mechanisms of Reactive-Hot-Pressed TiB2-SiC-Ni Ceramic Composites\",\"authors\":\"G. Zhao, C. Huang, N. He, H. Liu\",\"doi\":\"10.4416/JCST2016-00110\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A TiB2-SiC-5 wt %Ni ceramic composite with high flexural strength and fracture toughness was fabricated in the reactive hot pressing (RHP) process. Different sintering times and sintering temperatures were employed. The strengthening and toughening mechanisms were investigated in detail. The composition and microstructure were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM) and energy-dispersive spectroscopy (EDS). The sintering time and sintering temperature had a significant influence on the mechanical properties and microstructure of the composite. The mechanical properties decreased as the sintering time was increased from 30 to 45 min, and subsequently increased with the further increase of the sintering time. The mechanical properties of the composite increased gradually as the sintering temperature increased. For the investigated range of parameters, the composite prepared at 1700 °C for 30 min had the optimum comprehensive mechanical properties with flexural strength of 1121 ± 31 MPa, fracture toughness of 7.9 ± 0.58 MPa⋅m1/2 and hardness of 21.3 ± 0.62 GPa. The improved flexural strength and fracture toughness of the composite were attributed to the strengthening and toughening effects of Ni and the elongated TiB2 grains, the intragranular nano-particle structure, and the dislocations and stacking fault. The clean interface is also conducive to the improved flexural strength.\",\"PeriodicalId\":48807,\"journal\":{\"name\":\"Journal of Ceramic Science and Technology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.5000,\"publicationDate\":\"2017-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"6\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Ceramic Science and Technology\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.4416/JCST2016-00110\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"MATERIALS SCIENCE, CERAMICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Ceramic Science and Technology","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.4416/JCST2016-00110","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
Mechanical Properties, Strengthening and Toughening Mechanisms of Reactive-Hot-Pressed TiB2-SiC-Ni Ceramic Composites
A TiB2-SiC-5 wt %Ni ceramic composite with high flexural strength and fracture toughness was fabricated in the reactive hot pressing (RHP) process. Different sintering times and sintering temperatures were employed. The strengthening and toughening mechanisms were investigated in detail. The composition and microstructure were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM) and energy-dispersive spectroscopy (EDS). The sintering time and sintering temperature had a significant influence on the mechanical properties and microstructure of the composite. The mechanical properties decreased as the sintering time was increased from 30 to 45 min, and subsequently increased with the further increase of the sintering time. The mechanical properties of the composite increased gradually as the sintering temperature increased. For the investigated range of parameters, the composite prepared at 1700 °C for 30 min had the optimum comprehensive mechanical properties with flexural strength of 1121 ± 31 MPa, fracture toughness of 7.9 ± 0.58 MPa⋅m1/2 and hardness of 21.3 ± 0.62 GPa. The improved flexural strength and fracture toughness of the composite were attributed to the strengthening and toughening effects of Ni and the elongated TiB2 grains, the intragranular nano-particle structure, and the dislocations and stacking fault. The clean interface is also conducive to the improved flexural strength.
期刊介绍:
The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of the relationships between processing, microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials. The papers may have either theoretical or experimental background. A high quality of publications will be guaranteed by a thorough double blind peer review process.