MICROSTRUCTURE, MECHANICAL PROPERTIES AND FRICTION/WEAR BEHAVIOR OF HOT-PRESSED Si₃N₄/ BN CERAMIC COMPOSITES
Nano-scale and micro-scale hexagonal boron nitride (hBN) powders, respectively, were added to silicon nitride (Si₃N₄) matrix powder, and Si₃N₄/BN ceramic composites with different content of solid-lubrication hBN were produced by hot pressing. The combined effect of starting powder and hBN content o...
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| Format: | Article |
| Language: | English |
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University of Chemistry and Technology, Prague
2019-01-01
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| Series: | Ceramics-Silikáty |
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| Online Access: | http://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=1242 |
| _version_ | 1797836040703049728 |
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| author | Wei Chen Zhaoxun Wang Gao Yimin Li Huaqiang He Nairu |
| author_facet | Wei Chen Zhaoxun Wang Gao Yimin Li Huaqiang He Nairu |
| author_sort | Wei Chen |
| collection | DOAJ |
| description | Nano-scale and micro-scale hexagonal boron nitride (hBN) powders, respectively, were added to silicon nitride (Si₃N₄) matrix powder, and Si₃N₄/BN ceramic composites with different content of solid-lubrication hBN were produced by hot pressing. The combined effect of starting powder and hBN content on the microstructure, mechanical properties and tribological properties of Si₃N₄/BN ceramic composites has been studied. The results showed that the nano-sized starting powder was beneficial to the densification of Si₃N₄/BN ceramic composites, and resulted in a Si₃N₄/BN nano/nano ceramic composite with slightly higher density and improved mechanical properties compared to the corresponding micro/nano ceramic composite. The physical and mechanical properties of Si₃N₄-based ceramic composites were found to be affected by addition of BN. Increasing BN content led to a decrease of bulk density, hardness, bending strength and fracture toughness. On the other hand, the starting powder has no significant influence on the tribological properties of Si₃N₄/BN ceramic composites. The friction properties and wear resistance continuously improved with increasing BN content up to 20 vol.%, due to the formation of tribochemical film composed of H₃BO₃, SiO₂ and metal oxides. |
| first_indexed | 2024-04-09T15:03:19Z |
| format | Article |
| id | doaj.art-bcbe531a8d2a4c108315da87aefd784a |
| institution | Directory Open Access Journal |
| issn | 0862-5468 1804-5847 |
| language | English |
| last_indexed | 2024-04-09T15:03:19Z |
| publishDate | 2019-01-01 |
| publisher | University of Chemistry and Technology, Prague |
| record_format | Article |
| series | Ceramics-Silikáty |
| spelling | doaj.art-bcbe531a8d2a4c108315da87aefd784a2023-05-01T06:11:38ZengUniversity of Chemistry and Technology, PragueCeramics-Silikáty0862-54681804-58472019-01-0163111010.13168/cs.2018.004010.13168/cs.2018.0040.20190917113136MICROSTRUCTURE, MECHANICAL PROPERTIES AND FRICTION/WEAR BEHAVIOR OF HOT-PRESSED Si₃N₄/ BN CERAMIC COMPOSITESWei Chen0Zhaoxun Wang1Gao YiminLi HuaqiangHe Nairu2 College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, P.R. China College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, P.R. China College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, P.R. China Nano-scale and micro-scale hexagonal boron nitride (hBN) powders, respectively, were added to silicon nitride (Si₃N₄) matrix powder, and Si₃N₄/BN ceramic composites with different content of solid-lubrication hBN were produced by hot pressing. The combined effect of starting powder and hBN content on the microstructure, mechanical properties and tribological properties of Si₃N₄/BN ceramic composites has been studied. The results showed that the nano-sized starting powder was beneficial to the densification of Si₃N₄/BN ceramic composites, and resulted in a Si₃N₄/BN nano/nano ceramic composite with slightly higher density and improved mechanical properties compared to the corresponding micro/nano ceramic composite. The physical and mechanical properties of Si₃N₄-based ceramic composites were found to be affected by addition of BN. Increasing BN content led to a decrease of bulk density, hardness, bending strength and fracture toughness. On the other hand, the starting powder has no significant influence on the tribological properties of Si₃N₄/BN ceramic composites. The friction properties and wear resistance continuously improved with increasing BN content up to 20 vol.%, due to the formation of tribochemical film composed of H₃BO₃, SiO₂ and metal oxides.http://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=1242friction mechanismsceramic compositeunlubricated wearsilicon nitride (si₃n₄)boron nitride (bn) |
| spellingShingle | Wei Chen Zhaoxun Wang Gao Yimin Li Huaqiang He Nairu MICROSTRUCTURE, MECHANICAL PROPERTIES AND FRICTION/WEAR BEHAVIOR OF HOT-PRESSED Si₃N₄/ BN CERAMIC COMPOSITES Ceramics-Silikáty friction mechanisms ceramic composite unlubricated wear silicon nitride (si₃n₄) boron nitride (bn) |
| title | MICROSTRUCTURE, MECHANICAL PROPERTIES AND FRICTION/WEAR BEHAVIOR OF HOT-PRESSED Si₃N₄/ BN CERAMIC COMPOSITES |
| title_full | MICROSTRUCTURE, MECHANICAL PROPERTIES AND FRICTION/WEAR BEHAVIOR OF HOT-PRESSED Si₃N₄/ BN CERAMIC COMPOSITES |
| title_fullStr | MICROSTRUCTURE, MECHANICAL PROPERTIES AND FRICTION/WEAR BEHAVIOR OF HOT-PRESSED Si₃N₄/ BN CERAMIC COMPOSITES |
| title_full_unstemmed | MICROSTRUCTURE, MECHANICAL PROPERTIES AND FRICTION/WEAR BEHAVIOR OF HOT-PRESSED Si₃N₄/ BN CERAMIC COMPOSITES |
| title_short | MICROSTRUCTURE, MECHANICAL PROPERTIES AND FRICTION/WEAR BEHAVIOR OF HOT-PRESSED Si₃N₄/ BN CERAMIC COMPOSITES |
| title_sort | microstructure mechanical properties and friction wear behavior of hot pressed si₃n₄ bn ceramic composites |
| topic | friction mechanisms ceramic composite unlubricated wear silicon nitride (si₃n₄) boron nitride (bn) |
| url | http://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=1242 |
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