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为研究 nm级流体膜的失效情况 ,采用 NGY- 2型nm级膜厚测量仪 ,根据光干涉相对光强原理 ,对纯滚动点接触的中心区进行润滑膜厚度测量。观察不同载荷和速度下纯烷烃及加入少量酸时的流体膜厚度的变化情况 ,考察流体效应膜的失效情况。实验表明 :使用烷烃作润滑剂时 ,当压力增至某一定值时有一个临界点 ,当速度低于此点时 ,膜厚剧减 ,此时润滑膜不再具有流体特征 ,此点是润滑膜失效点 ,它与压力、速度、润滑剂的粘度以及分子极性有关。加入少量极性添加剂后所形成的润滑膜可承受较大的载荷 ,并能确保nm级流体膜不失效 ;在较高压力下 ,要在接触区形成流体膜就必须施加更高的速度或使用较大粘度的润滑剂 ;极性添加物的加入能提高流体膜的承载能力
In order to study the failure condition of nm-level fluid film, the thickness of the lubricant film was measured in the central region of pure rolling contact point according to the principle of relative light intensity of light interference by NGY-2 type nm film thickness measuring instrument. The changes of the thickness of the fluid film under the different loadings and velocities of pure alkanes and the addition of a small amount of acid were observed, and the failure of the fluid effect film was investigated. Experiments show that when paraffin is used as a lubricant, there is a critical point when the pressure increases to a certain value. When the velocity is lower than this point, the film thickness drastically decreases. At this time, the lubricating film no longer has the fluid characteristic, Membrane failure point, it is related to pressure, velocity, lubricant viscosity and molecular polarity. The lubricant film formed by adding a small amount of the polar additive can withstand a large load and can ensure that the nm-level fluid film does not fail; at higher pressures, it is necessary to apply a higher speed or use Larger viscosity lubricants; polar additives added to improve the carrying capacity of the fluid film