多功能微磨损试验机性能研究

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Ball cratering is a well established technique for assessment of coating thickness. A multifunctional micro- wear tester was developed to assess wear behavior of materials by means of a rotating ball （ or cylinder） continuously fed by abrasive slurry and a wear crater （ spherical or cylindrical） produced. The dimensions of wear crater on the surface of sam- ples can be measured with scanning or optical microscope, and then the wear volumes of coating and matrix can be calcu- lated, respectively. By analyzing large quantity of experimental data at the different testing conditions such as speed, load, abrasive, and so on, the stability and the repeatability of the multifunctional micro-wear tester were evaluated. The results show that the tester has high test precision, and the experimental data under point contact mode have better stability and repeatability than that under line contact mode. The sliding velocity and the load of the tester should be controlled in 0. 1 m/s and below 0. 5 N, respectively.通过测量球形磨坑尺寸来计算涂层的厚度是一个行之有效的方法，基于可准确测量磨坑尺寸的思想，研制一台多功能微磨损试验机用来评价材料的磨损性能，其原理为在磨料料浆的作用下，在一个旋转的对磨球（圆柱）试样表面产生一个球形（圆柱形）磨坑，利用扫描显微镜或光学显微镜测量出磨坑尺寸，从而计算出磨损体积。通过分析不同速度、载荷及磨料等参数下试样的微磨损实验数据，考察多功能微磨损试验机的稳定性和重复性。结果表明：该试验机试验精度高，其在点接触方式下的数据重复性和稳定性优于线接触；试验滑动速度应控制在0．1m／s，试验载荷最好控制在0．25N以下。