本文選題：PVD　切入點：CrN涂層　出處：《西南交通大學》2011年碩士論文　論文類型：學位論文

【摘要】：物理氣相沉積(簡稱PVD)技術制備的CrN涂層以及CrN加入Al后形成的三元Cr-Al-N系涂層具有優(yōu)良的綜合性能,已被成功用于刀具、模具、軸承和活塞環(huán)等耐磨零件表面,其中高A1含量的AlCrN涂層由于其優(yōu)越的抗高溫氧化和磨粒磨損性能更是成為新一代三元PVD氮化物涂層最典型的代表。轉動微動磨損是在交變載荷下接觸副發(fā)生轉動的相對運動所造成的磨損。轉動微動現(xiàn)象廣泛的存在于工業(yè)設備、民用機械及醫(yī)療器械中,其造成的事故比比皆是,每年由于轉動微動磨損帶來的損失不可估量。涂層材料對微動磨損與疲勞有很好的防護作用,而CrN和AlCrN涂層作為耐磨涂層用于解決轉動微動模式下磨損問題有著很大的前景,如應用在高檔主軸承和球閥等零部件中表現(xiàn)出了優(yōu)異的耐磨性,然而迄今為止關于這兩種涂層的轉動微動摩擦磨損特性的研究鮮見報道。 本文利用新型轉動微動磨損試驗裝置,采用球／平面接觸,對磨副為Si3N4陶瓷球,研究了物理氣相沉積制備的CrN和AlCrN涂層在不同法向載荷(Fn=10N、20N、40N)和不同轉動角位移幅值(θ=0.125°、0.25°、0.5°、1°、2°)條件下的轉動微動摩擦磨損行為。在分析摩擦動力學行為的基礎上,用掃描電子顯微鏡(SEM)、表面輪廓儀、電子能譜儀(EDX)分別對涂層的磨損形貌、磨痕輪廓、磨損表面和磨屑的成分進行微觀分析,對兩種涂層轉動微動損傷特征進行了討論,得到以下結論： 1.轉動微動參數(shù)對CrN和AlCrN涂層的界面摩擦狀態(tài)具有重要影響,兩種涂層的轉動微動運行區(qū)域依賴于法向載荷和轉角位移幅值,隨著法向載荷的降低或轉角位移幅值的增加,涂層轉動微動從部分滑移向完全滑移轉變,相同工況下AlCrN涂層較CrN涂層更容易趨于部分滑移狀態(tài)。 2.CrN和AlCrN涂層的摩擦系數(shù)演變趨勢極大地取決于所對應的微動狀態(tài),涂層在完全滑移狀態(tài)下的摩擦系數(shù)較部分滑移的高,兩種涂層摩擦系數(shù)值隨法向載荷的增大而降低,隨轉動角位移幅值增大而增大,摩擦系數(shù)爬升階段對應的循環(huán)次數(shù)隨著法向載荷的增大而明顯增加,但隨轉動角位移幅值增大而減少。在高載荷(Fn=40N)時,不同轉角位移幅值下CrN涂層的摩擦系數(shù)穩(wěn)定值都明顯較AlCrN涂層的低。AlCrN涂層摩擦系數(shù)隨著轉角位移幅值的增大而明顯增大,且曲線走勢存在明顯差異,而轉角位移幅值的變化對CrN涂層的摩擦系數(shù)值影響不大。 3.兩種涂層在摩擦界面為部分滑移狀態(tài)時,摩擦界面損傷較為輕微,產生的磨屑很少,而在完全滑移狀態(tài)時,轉動磨損損傷是二體作用和三體作用共同作用的結果,角位移幅值的增大涂層進入完全滑移狀態(tài)后的損傷明顯加重,產生較多的磨屑并分布在磨痕兩端。高法向載荷(Fn=40N)下,轉角位移幅值對兩種涂層的轉動微動損傷行為有重要影響,轉動角位移幅值由1°增大為2°后,兩種涂層在磨痕中心處的磨損特征以及排屑行為都存在明顯的差異,主要為CrN涂層磨痕內有較明顯的磨屑碾壓堆積,而AlCrN涂層具有較好的排屑行為,磨痕中心處有明顯的塑性累積隆起的痕跡。完全滑移狀態(tài)下兩種涂層的損傷隨轉角位移幅值的增大而明顯加重,但磨損機理都主要為磨粒磨損和輕微的氧化磨損。
[Abstract]:Physical vapor deposition (PVD) of three yuan Cr-Al-N coating formation preparation technology of CrN coating and CrN after joining Al has excellent comprehensive performance, has been successfully used in cutting tools, dies, bearings and piston ring wear parts surface, AlCrN coating with high A1 content because of its excellent high temperature oxidation resistance and the abrasive wear performance is becoming the most typical representative of a new generation of three yuan PVD nitride coatings. Rotational fretting wear is under alternating load side contact wear caused by relative movement of the rotational fretting. It widely exists in industrial equipment, civil mechanical and medical devices, the accident caused by meet the eye everywhere, every year because the rotational fretting wear bring immeasurable loss. The coating material on the fretting wear has good protective effect and fatigue, while the CrN and AlCrN coatings as wear-resistant coating is used to solve the rotational fretting mode Wear problems have great prospects, such as applications in high-grade main bearings and ball valves and other parts, showing excellent wear resistance. However, up till now, the research on the rotational fretting wear characteristics of the two coatings has rarely been reported.
In this paper, using a new rotational fretting wear test device, using a ball / plane contact of the friction pair of Si3N4 ceramic ball, on the physical vapor deposition of CrN and AlCrN coatings to load in different methods (Fn=10N, 20N, 40N) and different angular displacement amplitudes (theta =0.125 degrees, 0.25 degrees, 0.5 degrees, 1 degrees, 2 degrees) under the condition of rotational fretting wear behavior. Based on the analysis of the dynamic behavior of friction, using scanning electron microscopy (SEM), surface profiler, electron spectrometer (EDX) respectively on the wear morphology of the coating, wear contour, wear surface and wear debris of micro components analysis of two kinds of coating rotary fretting damage characteristics are discussed, and get the following conclusions:
1. rotational fretting parameters has important influence on interface friction state of CrN and AlCrN coating, two coating rotational fretting region depends on the normal load and the angular displacement amplitude. With the increase of the normal load decreases and angular displacement amplitude, rotational fretting coating changes from partial slip to slip under the same conditions, AlCrN coating a CrN coating is easy to tend to the partial slip condition.
The friction coefficient of 2.CrN coating and AlCrN evolution depends greatly on the micro state of the friction coefficient of the coating in full slip condition with partial slip is high, two kinds of coating friction coefficient with the normal load decreases, and increases with the rotating angular displacement amplitude increases, the friction coefficient corresponding to the ascent stage number of cycles with the normal load significantly increases, but with the rotation angular displacement amplitude decreases. Under high load (Fn=40N), different angular displacement amplitudes and stable friction coefficient values of CrN coating.AlCrN coating low friction coefficient of AlCrN coating was significantly increased with the increase of the angular displacement amplitude. There are obvious differences and curve trend, and the variation of the angular displacement amplitude the friction coefficient of CrN coating value has little effect.
3. two kinds of coating on friction interface for partial slip condition, the friction interface damage is slight, the wear debris produced little in the full slip state, rotating abrasion injury is the common two body and three body effect, increase the amplitude of displacement angle of coating completely into the sliding state after the injury was aggravated, to generate more debris and distribution in grinding ends. High normal load (Fn=40N), angular displacement amplitude has great influence on the two kinds of coating the rotational fretting damage behavior, angular displacement amplitude increases from 1 degrees to 2 degrees, two kinds of coating on the wear scar at the center of the wear characteristics and discharge chip behavior are significant differences, mainly for CrN coating wear has obvious rolling debris accumulation, while the AlCrN coating has good chip behavior, has obvious plastic cumulative traces of uplift wear at the center. Two under full slip state The damage of the coating is obviously aggravated with the increase of the angular displacement amplitude, but the wear mechanism is mainly abrasive wear and slight oxidation wear.

【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TG174.4;TH117.1

【參考文獻】

相關期刊論文 前10條

1 莫繼良;朱e，

本文編號：1569814