Understanding the friction and wear of KDP crystals by nanoscratching
Understanding the friction and wear of KDP crystals by nanoscratching
复制标题
通过纳米划痕了解 KDP 晶体的摩擦和磨损
DOI：
10.1016/j.wear.2014.11.032
复制
发表时间：
2015-05-01
期刊：
影响因子：
5
通讯作者：
Liu, Weidong
中科院分区：
文献类型：
--
作者：
Zhang, Yong;Zhang, Liangchi;Liu, Weidong
磷酸二氢钾（KDP）是一种重要的非线性光学晶体材料，在大口径高功率激光系统中得到了广泛应用。本文的目的是探讨纳米摩擦和磨损机制的KDP使用伯克维奇和锥形压痕尖端。两种刮擦加载模式，“恒定”和“连续”，被应用。在实验过程中，对试验室内的湿度和温度进行了控制。研究发现，当刮擦载荷较低时，附着力起着重要的作用。由于压痕尖端前KDP的不均匀变形，导致侧向力或摩擦系数波动。在恒定载荷刮擦过程中，波动的频率和幅度随刮擦载荷的大小和压头的类型而变化，而速度效应似乎微不足道。KDP晶体的滑移可能是塑性变形的主要机制，受接触应力的影响很大。Berkovich尖端沿磨损轨迹产生更明显的波浪形槽壁，而锥形尖端产生更多的犁削变形。在本研究范围内的应变速率对微塑性变形的影响不大。(C) 2014 Elsevier B.V.版权所有
Potassium dihydrogen phosphate (KDP) is an important nonlinear optical crystal material, and has been widely used in large-aperture high-power laser systems. This paper aims to explore the friction and wear mechanisms of KDP by nanoscratching using Berkovich and conical indentation tips. Two scratching loading modes, the 'Constant' and the 'Continuous', were applied. During the experiment, the moisture and temperature in the testing chamber were controlled. The study found that the adhesive force plays an important role when the scratching load is low. The lateral force or the friction coefficient fluctuates due to the non-uniform deformation of the KDP in front of the indentation tip. During a constant loading scratching, the frequency and amplitude of the fluctuation vary with the level of the scratching load and the type of the indenter, while the velocity effect seems to be trivial. The slip in the KDP crystal, which is very much affected by contact stress, could be a main mechanism of plastic deformation. The Berkovich tip produces more obvious wavy groove walls, while the conical tip brings about more ploughing deformation along the wear track. The strain rate in the range investigated in this study seems to have a little effect on the micro-plastic deformation. (C) 2014 Elsevier B.V. All rights reserved.