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铁基烧结材料端面极限PV试验研究

Study on end face PV limit of iron-based sintered material

  • 摘要: 利用粉末冶金技术将Fe-C(0.8%C)原料压制成型,研究不同的端面摩擦磨损条件对其极限PV值的影响。结果表明:在压坯密度为6.8g/cm3,加载幅度为200N/10min条件下,摩擦速度0.2-0.8m/s时,随着摩擦速度的增加,极限PV值也随之增加,在0.8m/s时到达最大5.17MPa·m/s,在摩擦速度达到1.0m/s时,试验容易发生咬合;在压坯密度为6.8g/cm3,摩擦速度为0.4m/s条件下,加载幅度200-500N/10min时,极限PV值最大为4.73MPa·m/s,在相同摩擦速度下,加载幅度越小,试验结果的PV值越接近材料的真实值;在摩擦速度0.4m/s,加载幅度200N/10min条件下,压坯密度5.9-6.5g/cm3时,试验结束时的PV值是相同的,均为4.31MPa·m/s,密度为6.8g/cm3时,极限PV值为4.59MPa·m/s,略有增加,主要跟磨痕面的粗糙度有关。

     

    Abstract: The Fe-C (0.8%C) raw material is pressed and molded by powder metallurgy technology. The influence of end-face friction and wear conditions on the PV limit of powder metallurgy technology Fe-C (0.8%C) specimens were instigated. The results are shown below. The PV limit increases linearly with sliding speed within the 0.2-0.8 m/s velocity range, which reaches a maximum of 5.17 MPa·m/s at 0.8 m/s, but the galling occurs easily when the velocity is increased to 1 m/s. The PV limit inversely correlates with load amplitude increase within 200-500 N/10 min. At the same linear velocity, the smaller the loading amplitude, the closer the test result's PV limit is to the material's actual value. When the green density is 5.9-6.5g/cm3, the PV limit at the end of the test is 4.31MPa·m/s. The PV limit is 4.59MPa·m/s when the green density increases to 6.8g/cm3, which is mainly related to the roughness of the grinding surface.

     

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