载荷变化对口腔修复用纯钛摩擦磨损性能的影响

Influence of loading on friction and wear properties of pure titanium used in dentistry

目的探讨载荷变化对纯钛与滑石瓷对磨时摩擦磨损性能的影响。方法使用MMV-1立式万能摩擦磨损试验机,以滑石瓷为对磨物,载荷设置为20、50、100N,在37℃人工唾液润滑的试验工况下,对口腔修复用纯钛进行二体摩擦磨损试验。记录动态摩擦系数,采用扫描电镜观察表面磨损形貌,X线衍射能谱仪分析磨屑成分,电子天平得出磨损量。结果纯钛与对磨物滑石瓷的磨损量及摩擦系数随载荷的增加而增大。载荷20N,纯钛的磨损机制主要为磨粒磨损;50N时,磨损机制是黏着磨损伴发磨粒磨损;100N时,纯钛磨损机制以黏着磨损为主。结论载荷增加可增大纯钛的磨损量,导致磨损机制改变,在高载荷条件下可发生严重黏着磨损,缩短纯钛修复体的使用寿命。

Objective To study the influence of load on friction and wear properties of pure Titanium （Ti）. Methods Two-body wear test was done on pure Ti by a MMV-1 vertical universal friction and wear testing machine in 37℃ with artificial saliva as lubricant, using steatite as the grinding material. Test loads were set as 20, 50 and 100 N. Dynamic friction coefficient was recorded, wear surface morphology was observed with electron microscope, debris element analysis was carried out by XRD and quality wear loss was measured by electronic balance. Results As loads increased, the wear loss and friction coefficient of the pure Ti increased. Under 20, 50 and 100 N loads, the dominant wear form was abrasive wear, adhesion wear accompanied with abrasive wear, and adhesion wear respectively. Conclusions The increase of loads enlarges the wear loss of pure Ti and changes its dominant wear form. Serious adhesion wear occurs under high loading conditions and the lifetime of pure Ti would therefore be shortened.