An Investigation on the High-Temperature Stability and Tribological Properties of Impregnated Graphite
Impregnated graphite is a common material for friction pairs in aeroengine seals, especially at high temperatures. For the convenience of the application of graphite materials in aeroengines, an SRV-4 tribometer and a synchronous thermal analyzer are employed to study the tribological properties and...
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MDPI AG
2024-11-01
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| Online Access: | https://www.mdpi.com/2075-4442/12/11/388 |
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| author | Juying Zhao Qi Xin Yunshuang Pang Xiao Ning Lingcheng Kong Guangyang Hu Ying Liu Haosheng Chen Yongjian Li |
| author_facet | Juying Zhao Qi Xin Yunshuang Pang Xiao Ning Lingcheng Kong Guangyang Hu Ying Liu Haosheng Chen Yongjian Li |
| author_sort | Juying Zhao |
| collection | DOAJ |
| description | Impregnated graphite is a common material for friction pairs in aeroengine seals, especially at high temperatures. For the convenience of the application of graphite materials in aeroengines, an SRV-4 tribometer and a synchronous thermal analyzer are employed to study the tribological properties and thermal stability of pure, resin-impregnated, metal-impregnated, and phosphate-impregnated graphite against stainless steel from room temperature to 500 °C. The results indicate that impregnations can improve the wear resistance and thermal stability of graphite at high temperatures. Compared with other impregnated graphite materials, the resin-impregnated graphite shows a good friction coefficient and poor wear rate and thermal stability over 300 °C, due to the degradation and oxidation of the resin-and-graphite matrix. The metal- and phosphate-impregnated graphite materials exhibit excellent wear resistance and thermal stability under 500 °C as a result of the protection of the impregnations, while the average friction coefficient of the metal-impregnated graphite is much greater than the phosphate-impregnated graphite, and even reaches 2.14-fold at 300 °C. The wear rates for the graphite impregnated with resin, metal, and phosphate are 235 × 10<sup>−7</sup>, 7 × 10<sup>−7</sup>, and 16 × 10<sup>−7</sup> mm<sup>3</sup>N<sup>−1</sup>m<sup>−1</sup> at 500 °C, respectively. Considering all aspects, the phosphate-impregnated graphite exhibits excellent tribological properties and thermal stability. |
| format | Article |
| id | doaj-art-a0ada537d9cf44adae7133be2b32c50d |
| institution | Kabale University |
| issn | 2075-4442 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Lubricants |
| spelling | doaj-art-a0ada537d9cf44adae7133be2b32c50d2024-11-26T18:10:51ZengMDPI AGLubricants2075-44422024-11-01121138810.3390/lubricants12110388An Investigation on the High-Temperature Stability and Tribological Properties of Impregnated GraphiteJuying Zhao0Qi Xin1Yunshuang Pang2Xiao Ning3Lingcheng Kong4Guangyang Hu5Ying Liu6Haosheng Chen7Yongjian Li8State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, ChinaShenyang Engine Research Institute, Aero Engine Corporation of China, Shenyang 110015, ChinaShenyang Engine Research Institute, Aero Engine Corporation of China, Shenyang 110015, ChinaShenyang Engine Research Institute, Aero Engine Corporation of China, Shenyang 110015, ChinaShenyang Engine Research Institute, Aero Engine Corporation of China, Shenyang 110015, ChinaShenyang Engine Research Institute, Aero Engine Corporation of China, Shenyang 110015, ChinaState Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, ChinaImpregnated graphite is a common material for friction pairs in aeroengine seals, especially at high temperatures. For the convenience of the application of graphite materials in aeroengines, an SRV-4 tribometer and a synchronous thermal analyzer are employed to study the tribological properties and thermal stability of pure, resin-impregnated, metal-impregnated, and phosphate-impregnated graphite against stainless steel from room temperature to 500 °C. The results indicate that impregnations can improve the wear resistance and thermal stability of graphite at high temperatures. Compared with other impregnated graphite materials, the resin-impregnated graphite shows a good friction coefficient and poor wear rate and thermal stability over 300 °C, due to the degradation and oxidation of the resin-and-graphite matrix. The metal- and phosphate-impregnated graphite materials exhibit excellent wear resistance and thermal stability under 500 °C as a result of the protection of the impregnations, while the average friction coefficient of the metal-impregnated graphite is much greater than the phosphate-impregnated graphite, and even reaches 2.14-fold at 300 °C. The wear rates for the graphite impregnated with resin, metal, and phosphate are 235 × 10<sup>−7</sup>, 7 × 10<sup>−7</sup>, and 16 × 10<sup>−7</sup> mm<sup>3</sup>N<sup>−1</sup>m<sup>−1</sup> at 500 °C, respectively. Considering all aspects, the phosphate-impregnated graphite exhibits excellent tribological properties and thermal stability.https://www.mdpi.com/2075-4442/12/11/388graphitehigh temperaturestabilitywear mechanism |
| spellingShingle | Juying Zhao Qi Xin Yunshuang Pang Xiao Ning Lingcheng Kong Guangyang Hu Ying Liu Haosheng Chen Yongjian Li An Investigation on the High-Temperature Stability and Tribological Properties of Impregnated Graphite Lubricants graphite high temperature stability wear mechanism |
| title | An Investigation on the High-Temperature Stability and Tribological Properties of Impregnated Graphite |
| title_full | An Investigation on the High-Temperature Stability and Tribological Properties of Impregnated Graphite |
| title_fullStr | An Investigation on the High-Temperature Stability and Tribological Properties of Impregnated Graphite |
| title_full_unstemmed | An Investigation on the High-Temperature Stability and Tribological Properties of Impregnated Graphite |
| title_short | An Investigation on the High-Temperature Stability and Tribological Properties of Impregnated Graphite |
| title_sort | investigation on the high temperature stability and tribological properties of impregnated graphite |
| topic | graphite high temperature stability wear mechanism |
| url | https://www.mdpi.com/2075-4442/12/11/388 |
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