Tribology Performance and Adhesive Strength Evaluation of TiAlSiN Coating

Scratch test and friction test were performed to evaluate the internal and external interface behaviors of TiAlSiN coating, respectively. The critical compressive and shearing stress of coating failure during scratch test were calculated and the values are 30.84 MPa and 4.98 MPa respectively. The average friction coefficients of TiAlSiN coating against 2Cr12Ni4Mo3VNbN steel are 0.70 (sliding speed 50 m/min), 0.63 (sliding speed 100 m/min), and 0.81 (sliding speed 150 m/min). The elements diffusion was analyzed by EDS. Al and Si element of coating material diffuse to the steel disc, except Ti element. The oxidation decreases with the increase of sliding speed, but the adhesion increases with the increase of sliding speed. More Al element diffuses to the steel disc at the high sliding speed, but the diffusion of Si element keeps almost constant at different sliding speeds.     

Development of integrated precision vibration-assisted micro-engraving system

A novel precision vibration-assisted micro-engraving system was developed by the integration of fast tool servo and ultrasonic elliptical vibration system, in which the flexure hinge was designed to avoid backlash and PID control algorithm was established to guarantee specific precision. Apart from experimental validation of the performance of the system, various micro-V-grooves cutting experiments on aluminum alloy, ferrous material and hard cutting material were performed, in which Kistler force sensor was used to measure cutting force. Through experiments, it was clear that the vibration-assisted micro-engraving system can ensure good quality of micro-V-grooves and reduce cutting force by about 60% compared with traditional removal process without ultrasonic vibration.     

我把班长变小了

（二十一）孔西西的最新动态 我觉得应该去问问孔西西——即使她不能完全记住喝下去的那口珍珠奶茶的味道,记住一点点儿总是可以的——到时候．我就按照孔西西的记忆来重新调配珍珠奶茶。我相信自己一定能研制出把人变小的配方来。     

馅饼里包了一块天

经典大师秀 琼·艾肯出生在英国,她的爸爸是一位著名的诗人,她的全家都热爱文学,     

透过材料掌握金属知识

<正>中考在考查金属知识时,常通过对所给材料或信息进行分析,然后结合已学化学知识来解答,这就要求大家能对所给材料进行分析,抓住关键,得出正确答案。一、判断合金的组成例1制取合金的常用方法之一是:将两种或多种金属(或金属与非金     

雪后的阳光

原来是这样!一张薄薄的试卷竟然包裹着这样一份深厚的情谊。我感到眼前一片模糊,眼眶潮湿了,我急忙用手去拭。     

刘海的来历

小孩或女子前额,留有整齐的短发,人们称这种发型为“刘海”,有人也写作“留海”。不过,后一种写法是错误的,因为这种发型和历史的一个有关,这个人便是五代时的刘海。     

中文与英文

问题一：我的字写得很差,该怎么办？     

哼将军和哈将军

哼将军和哈将军本来互相不认识。 这天,哼将军来找玉皇大帝,想打一份工。 玉皇大帝看看哼将军,哟,不错不错,哼将军的金彪眼炯炯有神,哼将军的蒜头鼻子威风八面,哼将军又腆着个啤酒肚子,往那儿一站,就像一尊铁塔。     

嘴巴上加把锁

早上一醒来,周瑜就问小乔：“夜里我说梦话了吗？” 小乔说：“没有啊。你问这个干什么？” 周瑜说：“没什么。”