人工关节滑液的摩擦学性能及摩擦化学研究

采用小牛血清和0.9%NaCl生理盐水配制了关节滑液,在四球摩擦磨损试验机上考察了其摩擦学性能,并用X射线光电子能谱仪分析了磨斑表面膜的元素组成和化学状态.结果表明:生理盐水的减摩抗磨性能较差,而小牛血清具有优异的减摩抗磨性能;滑液的减摩抗磨性能随小牛血清体积分数增加而逐步提高;滑液具有优良减摩抗磨性能的原因在于,血清在摩擦过程中发生摩擦化学反应,生成由蛋白质吸附膜、CaCO3沉积膜以及FePO4化学反应膜等组成的边界润滑膜.

Tribological Properties and Tribochemistry of Articular Synovial Fluids Made of Physiological Saline and Calf Serum

Articular synovial fluids of different compositions were prepared from calf serum and 0.9%NaCl physiological saline. The anti-wear and friction-reducing properties of the resulting articular synovial fluids were evaluated using a four-ball machine. The worn surfaces of the steel ball lubricated with the synovial fluid were analyzed by means of X-ray photoelectron spectroscopy. It was found that the calf serum had excellent anti-wear and friction-reducing capacities, but the physiological saline was poor in terms of the anti-wear and friction-reducing capacities. Thus the incorporation of the calf serum at different volume fractions contributed to improve the anti-wear and friction-reducing capacities of the physiological saline. The improved anti-wear and friction-reduction of the physiological saline in the presence of the calf serum was attributed to the boundary film composed of the adsorbed protein of the serum, the deposited CaCO_3 layer originated from the serum, and the tribochemical reaction layer containing FePO_4 on the worn steel surface.