纯钛材与大变形纯钛材微弧氧化膜层的力学性能研究

Mechanical Properties of Micro-arc Oxidation Coating on Titanium and Large Plastic Deformed Titanium

摘要:

采用微弧氧化法在纯钛材及大变形纯钛材表面制备了含钙、磷的多孔氧化膜层，研究膜层的微观形貌、硬度、膜基结合力、滚动摩擦磨损性能等性能，探讨探讨钛基材组织细化对其膜层结构及力学性能的影响。结果表明：与纯钛材微弧氧化膜层相比，大变形纯钛材微弧氧化膜层表面微纳米尺度的孔洞更多，孔隙率更高（10.84% vs. 9.68%），孔洞孔径更小（8.67μm vs. 9.68μm），表面更平坦，锐钛矿相含量更高（43.13% vs. 37.74%），膜-基结合能力更强（17N vs. 8N），摩擦系数较低（0.338 vs. 0.358），耐磨性能更优，以上的膜层结构及力学性能的改善归因于其钛基材大变形化提高了晶体缺陷所致。

Abstract:

This paper reports the use of micro-arc oxidation(MAO) to prepare porous oxide coatings containing Ca and P on the surface of titanium and large plastic deformed titanium. The surface morphology, hardness, film-substrate bonding force, fretting friction and wear properties and bioactivity of MAO coatings on titanium and large plastic deformed titanium were investigated. Results reveal that compared with the MAO coating of conventional titanium, pores on the MAO coating of large plastic deformed titanium are more uniformly and compactly distributed, with smaller micro-sized pores, which have larger quantity, higher porosity, smoother and more level surface , larger relative content of rutile TiO2, higher hardness value, stronger adhesion strength. The improvements were caused by the increasement of crystal defects (internal energy) due to the microstructure refinement of large plastic deformed titanium.