聚醚醚酮与髌骨软骨间的生物摩擦学特性

以聚醚醚酮(polyetheretherketone,PEEK)与天然软骨为研究对象,医用CoCrMo和天然软骨作为PEEK的对比材料,开展往复滑动摩擦磨损实验,研究法向载荷、滑移速率、摩擦配副对其摩擦磨损行为的影响。结果表明:在小牛血清润滑的条件下,天然股骨软骨/髌骨软骨的摩擦因数最小,PEEK/髌骨软骨摩擦因数明显低于CoCrMo/髌骨软骨,PEEK/髌骨软骨配副的软骨表面磨损轻微,CoCrMo/髌骨软骨配副的软骨表面损伤严重;PEEK/髌骨软骨配副间的摩擦因数随法向载荷的增大而减小,在低载荷条件下(10～20N)表现明显,且法向载荷越大,PEEK表面磨痕越深,摩擦副磨损越严重;PEEK/髌骨软骨配副间的摩擦因数随滑移速率的增大而增大,在高滑移动速率条件下(10～20mm/s)明显,且滑移速率越大,PEEK表面磨痕越深,摩擦副磨损越严重;相对于滑移速率,载荷对摩擦因数的影响更大。

Biological tribological properties between polyetheretherketone and patella cartilage

Reciprocating sliding friction and wear tests were carried out on polyetheretherketone(PEEK)and natural patella cartilage using the pin-on-disk configuration at different normal loads,slipping velocity and friction pairs under 25%fetal bovine serum,where natural femoral cartilage and CoCrMo were used for comparison to PEEK.The influence of normal load,slipping velocity and friction pair on the friction and wear behavior was studied.The results show that under 25%fetal bovine serum conditions,the friction coefticient offemoral cartilage/patella cartilage is the smallest among that of PEEK/patella cartilage and CoCrMo/patelk cartilage,the coefticient of friction of PEEK/patella is obviously lower thanthat of CoCrMo/patela and the wear surface ofCoCrMo/patella is more seriously damaged than that of PEEK/patella.The friction coefticient of PEEK/patella decreases with the increase of norma l load especial ly under the low loads(10~20N)and increases with the increase of slipping velocity especially under the high slipping velocity conditions(10~20mm/s).The wear surface damage increases with the increase of normal load and slipping velocity.The normal load ismore effective than slipping velocity.