以稻壳为强化原料制备低成本钛合金的摩擦学性能

Tribological Properties of Low-cost Titanium Alloys Reinforced by Rice Husk

以稻壳热解产物为SiO2源,通过粉末冶金法制备了Si和O固溶强化的低成本钛合金,并从磨损率、磨损表面形貌和磨屑成分等角度研究了其摩擦学性能和磨损机理。结果表明,随着SiO2加入量的增加,Ti合金的体积磨损率显著降低,与硬度的变化规律吻合良好,同时磨损表面有三处变化,即犁沟的深度变浅、塑性变形程度降低和磨屑的尺寸变小且数量减少。SiO2的加入使磨损机制从纯Ti的粘着磨损和磨料磨损转变为磨料磨损和氧化磨损,而磨屑尺寸的减小可归因于GCr15球和钛基体反复摩擦,导致磨屑的脆化。本研究提供了一种使用农业废稻壳生产具有优良综合性能的钛合金方法,在降低钛合金成本的同时也有益于生态环境的保护。

Wear performance and mechanism of Ti alloys strengthened by solid solute atoms Si and O from rice husk were studied from the viewpoint of wear rate,worn surface morphology and wear debris analysis.Results show that the hardness of Ti alloys increases while the volume wear rate decreases significantly with the addition of SiO2.There are three changes of the worn surface with the increase in SiO2 content.One is the transfer of deep grooves to shallow scratches,second is the decrease of plastic deformation degree and the third is the reduction in size and amount of adhesive debris.The decrease of debris size can be attributed to the embrittlement of wear dust since the content of hard and brittle counter grinding GCr15 steel increases in the wear dust and the hardness of Ti alloys increases with the increase in SiO2 content.Wear mechanism also transfers from adhesive and abrasive wear of pure Ti to abrasive and oxidation wear with the increase in SiO2 content.The results provides a cheap method to produce Ti alloys with excellent comprehensive properties by agricultural waste rice husk,which is also benefit for the environmental protection.