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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 materials

  • 摘要: 利用粉末冶金技术将Fe‒C(0.8%C)原料压制成形,研究不同端面摩擦磨损条件对成形件极限PV值的影响。结果表明:在压坯密度为6.8 g/cm3,加载幅度为200 N/(10 min)条件下,当摩擦速度为0.2~0.8 m/s时,随着摩擦速度的增加,极限PV值也随之增加;在摩擦速度为0.8 m/s时,极限PV值达到最大5.17 MPa·m·s‒1;在摩擦速度达到1.0 m/s时,试验容易发生咬合。在压坯密度为6.8 g/cm3,摩擦速度为0.4 m/s条件下,当加载幅度为200~500 N/(10 min)时,极限PV值最大为4.73 MPa·m·s‒1;在相同摩擦速度下,加载幅度越小,PV值试验结果越接近材料的真实PV值。在摩擦速度为0.4 m/s,加载幅度为200 N/(10 min)条件下,当压坯密度为5.9~6.5 g/cm3时,PV值不变,均为4.31 MPa·m·s‒1;当压坯密度为6.8 g/cm3时,极限PV值为4.59 MPa·m·s‒1,略有增加,主要跟磨痕面的粗糙度有关。

     

    Abstract: The Fe‒C (0.8%C) raw materials were pressed and molded by powder metallurgy technology. The influence of end-face friction and wear condition on the PV limit of Fe‒C (0.8%C) moulding specimens was investigated. The results show that, under the conditions of 6.8 g/cm3 compact density and 200 N/(10 min) loading amplitude, when the friction speed is 0.2~0.8 m/s, the limit PV increases with the increase of friction speed. When the friction speed is 0.8 m/s, the limit PV reaches the maximum of 5.17 MPa·m·s‒1. When the friction speed reaches 1.0 m/s, the biting can easily occur. Under the conditions of 6.8 g/cm3 compact density and 0.4 m/s friction speed, when the loading amplitude is 200~500 N/(10 min), the maximum limit PV is 4.73 MPa·m·s‒1. Under the same friction speed, the smaller the loading amplitude, the closer the PV test result is to the true PV value. Under the conditions of 0.4 m/s friction speed and 200 N/(10 min) loading amplitude, when the compact density is 5.9~6.5 g/cm3, the PV value remains unchanged, all being 4.31 MPa·m·s‒1. When the compact density is 6.8 g/cm3, the limit PV is 4.59 MPa·m·s‒1, which increases slightly, mainly related to the roughness of the grinding mark surface.

     

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