【作者】 沙东；

【导师】 张会臣；

【作者基本信息】 大连海事大学 ， 载运工具运用工程， 2011， 硕士

【摘要】 钛合金的表面改性处理可显著改善其摩擦学特性,本文将激光表面改性技术和表面织构化相结合,在钛合金表面分别构筑直线织构、网格织构和点阵状织构。对构筑的各种织构进行了表征,研究了各种织构表面的摩擦系数与织构间距、载荷和滑动速度之间的关系。通过磨斑形貌分析,比较了织构表面与抛光表面的摩擦学特性。得出的主要结论如下：1.经激光表面织构化处理后,试样表面形成了规则排列的直线织构、网格织构和点阵状织构。试样表面硬度得到显著提高。其中,点阵状织构试样的表面硬度最高,网格织构试样的表面硬度次之,直线织构试样的表面硬度最低。同样间距的网格织构试样的表面粗糙度最大,直线织构试样的表面粗糙度次之,而点阵状织构试样表面粗糙度最小。2.在高载荷、大间距条件下,点阵状织构试样的摩擦系数小于抛光试样的摩擦系数。载荷越大,间距越大,点阵状织构越有助于减小摩擦系数。网格织构和直线织构的摩擦系数均大于抛光试样的摩擦系数,并且网格织构试样的摩擦系数大于直线织构试样的摩擦系数。即并不是所有的表面织构都能降低摩擦系数,当表面织构的坑槽增大摩擦阻力的效应大于其捕获磨屑,减少参与犁削和切削作用的效应时,表面织构反而会使摩擦系数增大。3.在高滑动速度条件下,织构面更有利于使摩擦系数变得平稳。随着载荷的增大,织构表面的摩擦系数变得不平稳。直线织构的间距对摩擦系数的影响的规律性不明显；随着网格织构间距的增大,摩擦系数逐渐减小；较大间距的点阵状织构表面,可以获得较小的摩擦系数。4.抛光表面磨损严重,磨痕也较深,并且产生了大量磨屑,主要表现为犁沟及黏着磨损。织构化表面的磨痕较浅,结构保留较完整,磨损明显小于抛光表面。对于点阵织构表面,凹坑起到了捕获磨屑的作用,因此试样的耐磨性较抛光表面试样大为提高。更多还原

【Abstract】 Tribological characteristics of Titanium alloy can be improved significantly by surface modification treatment. In this thesis, line texture, grid texture and dot texture were prepared on titanium alloy surface by laser surface modification technique. The characterization to various textured surfaces was conducted. The relationships between friction coefficients and spacing of texture, load and sliding velocity were analyzed. The comparation on textured surfaces and polished surface was done by wear track analysis. Main results were concluded as follow.1. The regular line texture, grid texture and dot texture are formed after laser textured surface treatment, and the hardness of various specimens increases significantly. The specimens with dot texture possess the highest hardness, the specimens with grid texture are in the second, and the hardness of specimens with line texture is the lowest. In the same spacing, the roughness of specimens with grid texture is the largest, and that of specimens with line texture takes second place. The roughness of dot texture is the lowest.2. The friction coefficients of specimens with dot texture are smaller than that of polished specimens in the condition of high load and large spacing. Higher load and larger spacing help to reduce friction coefficient. The friction coefficients of specimens with grid and line texture are larger than that of polished specimens, and the friction coefficients of specimens with grid texture are larger than that of specimens with line texture, which means that not all textured surfaces can reduce friction coefficients. On the contrary, friction coefficients increase when the effect of friction drag increasing by groove or dot in textured surface is stronger than that of debris capturing and ploughing or cutting reduction.3. Friction coefficients become steady for textured surfaces in high sliding velocities. Friction coefficients become unsteady for textured surfaces with load increasing. The effect of spacing of line texture on friction coefficients possesses no clear regularity. Friction coefficients become smaller with spacing of grid texture increasing. Smaller friction coefficients appear for larger spacing of dot texture.4. The wear on polished surfaces is very serious and wear tracks are deep with a great deal of debris, which means ploughing action and adhesive wear. Wear tracks are not very deep and the surface structures are intact, which indicates that wear is not so serious as polished surfaces. The antiwear resistance for dot textured specimens increase significantly because of theirs capturing debris action of dots.更多还原