采用粉末冶金技术制备Cu-SiO2烧结材料,研究了Cu-SiO2摩擦表面上的Si02颗粒与摩擦第三体的关系.结果表明,在摩擦中Cu-SiO2中的SiO2颗粒起钉扎点的作用,阻止第三体颗粒的运动,形成第三体塞积区,第三体的塞积面积和存在周期取决于SiO2颗粒的承载能力,SiO2颗粒的破损使第三体塞积区分解.第三体塞积区经历一个塞积-覆盖-分解-再塞积-再覆盖的过程;粘着性好的第三体充填到碎裂的SiO2裂纹中,对SiO2有夹持和覆盖的作用,有利于阻止碎裂的SiO2进一步剥落.随着SiO2含量的增加,起犁削作用的硬质点数增加,使摩擦系数提高;摩擦速度的提高伴随着温度的升高,容易形成连续而致密的第三体,有利于稳定摩擦系数;随着摩擦速度的降低,第三体疏松而不连续,容易脱离摩擦面而增大磨损量.
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