【正文】 制在一定范圍內(nèi)，以滿足設(shè)計(jì)的工作壽命。這說明，磨損類型可以隨工作條件的變化而發(fā)生轉(zhuǎn)化。疲勞磨損將在材料表面形成麻點(diǎn)、裂紋甚至微片剝落。（1）粘著磨損:粘著磨損是指在相互摩擦的兩表面之間，由于溫度較高，使摩擦表面的金屬局部熔化發(fā)生轉(zhuǎn)移粘附在相接觸的零件表面的現(xiàn)象。它直接影響著機(jī)器的運(yùn)轉(zhuǎn)精度和壽命。磨損類型形成原因現(xiàn)象影響因素粘著磨損邊界摩擦，載荷大，速度高，邊界膜破壞，表面尖峰接觸形成材料轉(zhuǎn)移材料硬度，表面粗糙度，載荷、速度、溫度，不同材料配副磨粒磨損表面的微峰或外界硬質(zhì)顆粒進(jìn)入摩擦面表面劃傷或犁溝現(xiàn)象環(huán)境，表面硬度、粗糙度疲勞磨損（也稱疲勞點(diǎn)蝕）接觸應(yīng)力反復(fù)作用：軸承、齒輪表層金屬剝落，形成點(diǎn)蝕凹坑表面硬度、粗糙度，潤滑油粘度雖然這種分類還不十分完善，但它概括了各種常見的磨損形式。磨粒磨損將會(huì)在材料表面劃出溝槽，其磨損程度隨運(yùn)動(dòng)速度、載荷、磨損硬度等的增大而加劇。以上介紹的為磨損的四種基本類型，但實(shí)際中表現(xiàn)出的磨損，常不能單純地納入上述四類基本形式。（二）磨損的形成因素（1）磨損形成的因素影響磨損的因素很多，但并非都可控制。應(yīng)當(dāng)提醒注意的是：有的潤滑劑可能對(duì)抗粘著磨損有利，但卻會(huì)引起更嚴(yán)重的氧化磨損。 摩擦磨損表面形貌的分析 摩擦過程中表面形貌的變化可以采用表面輪廓儀和電子顯微鏡來進(jìn)行分析。2）X 射線穿透能力大, 散射層厚度可達(dá)到104～102 cm。采用表面改性的方法，可以充分發(fā)揮材料表面和芯部不同的作用。如碳膜固體潤滑劑擦涂膜：將固體潤滑劑直接用軟布插涂到摩擦表面上形成的潤滑劑涂層。常用的有：機(jī)械強(qiáng)化處理，表面化學(xué)處理，常規(guī)的金屬熱處理，化學(xué)熱處理，熱噴涂和等離子噴涂膜等?；蚋淖兌栊圆牧媳砻娴拟g化性。 銅：氧化。 尚有回火、退火等處理方法，為改善和調(diào)整材料性質(zhì)。（四）結(jié)束語 在論文即將完成之際，感謝我的指導(dǎo)老師張小亮張老師，他嚴(yán)謹(jǐn)細(xì)致、一絲不茍的工作態(tài)度是我今后學(xué)習(xí)、工作中的榜樣。t agree with the disciplinary action your employer has taken against you your employer dismisses you and you think that you have been dismissed unfairly. For more informu, take advice from one of the organisations listed undert charge you more than 35% of your pensation s Premier League match at Chelsea on Sunday.I am going to be at the match tomorrow and I have asked to meet Ya ya Toure, he told BBC Sport.For me it39。s plaint. In a statement the Russian side added: We found no racist insults from fans of CSKA.Age has reached the end of the beginning of a word. May be guilty in his seems to passing a lot of different life became the appearance of the same day。 Then in high school, think don39。嫌惡過自己的怯懦，最終卻發(fā)現(xiàn)有很多緣分，有很多錯(cuò)過，好像冥冥之中真的已經(jīng)注定。Baumgartner the disappointing news: Mission aborted. r plays an important role in this mission. Starting at the ground, conditions have to be very calm winds less than 2 mph, with no precipitation or humidity and limited cloud cover. The balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our daytoday weather lives. It will climb higher than the tip of Mount Everest ( miles/ kilometers), drifting even higher than the cruising altitude of mercial airliners ( miles/ kilometers) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence. We often close ourselves off when traumatic events happen in our lives。2. Embrace the unfortable We all know what that twinge of anxiety feels like. We know how fear feels in our bodies: the tension in our necks, the tightness in our stomachs, etc. We can practice leaning into these feelings of disfort and let them show us where we need to ，也都感受過恐懼造成的生理反應(yīng)：脖子僵硬、胃酸翻騰。s not needed. Instead, he plans to deploy his 270squarefoot (25squaremeter) main chute at an altitude of around 5,000 feet (1,524 meters). In order to deploy this chute successfully, he will have to slow to 172 mph (277 kph). He will have a reserve parachute that will open automatically if he loses consciousness at mach speeds.Even if everything goes as planned, it won39。The initial impulse is to run away — to try and suppress these feelings by not acknowledging them. When we do this, we close ourselves off to the parts of our lives that we need to experience most. The next time you have this feeling of being truly unfortable, do yourself a favor and lean into the feeling. Act in spite of the fear.我們的第一反應(yīng)總是逃避——以為否認(rèn)不安情緒的存在就能萬事大吉，可這也恰好妨礙了我們經(jīng)歷最需要的生活體驗(yàn)。我們假裝一切仿佛都不曾發(fā)生，以此試圖忘卻傷痛，可就算隱藏得再好，最終也還是騙不了自己。At the moment, the sky is dark, the air is fresh factor after just rained. Suddenl