Influence of Sliding Speed on the Tribological Characteristics of Si3N4-hBN Ceramic Materials |
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| Authors: | Wei Chen Yimin Gao Liang Chen Huaqiang Li |
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| Affiliation: | 1. College of Mechanical and Electrical Engineering Shaanxi University of Science &2. Technology , Xi’an , Shaanxi , 710021 , China;3. State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University , Xi’an , Shaanxi , 710049 , China;4. Engineering Department, Jilin Xingyuan Road and Bridge Construction Limited Company , Yushu , Jilin , 130400 , China;5. State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University , Xi’an , Shaanxi , 710049 , China |
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| Abstract: | The influence of sliding speed on the unlubricated tribological behaviors of silicon nitride–boron nitride (Si3N4-hBN) composites was investigated with two modes in air by a pin-on-disc tribometer. Using the upper disc–on–bottom pin test mode, as the sliding speed increased, the friction coefficient of the sliding pairs showed an upward trend; for example, from 0.18 at the sliding speed of 0.40 m/s to 0.54 at the sliding speed of 1.31 m/s for the Si3N4/Si3N4–20% hBN pair. The surface analysis indicated that a tribochemical film consisting of SiO2 and H3BO3 formed on the wear surfaces of the Si3N4/Si3N4–20% hBN sliding pair at sliding speeds of 0.40 and 0.66 m/s. Moreover, the formation of this film lubricated the wear surfaces. At the sliding speed of 1.31 m/s, no tribochemical film formed on the wear surfaces, most likely due to the increase in surface temperature. In the upper pin–on–bottom disc test mode, the wear mechanism was dominated by abrasive wear, and no tribochemical products could be detected on the wear surfaces. The increase in sliding speed weakened the degree of abrasive wear, leading to a decrease in the friction coefficients. |
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| Keywords: | Composite Ceramics Unlubricated Wear Sliding Speed Boric Acid |
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