本文選題：氮化物涂層　切入點：沖蝕磨損　出處：《湘潭大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：沖蝕磨損是現(xiàn)代工業(yè)生產(chǎn)中常見的磨損形式之一，是引起材料破壞或者失效的一個重要原因。研究表明使用氮化物涂層材料是提高材料抗沖蝕磨損性能的有效途徑之一。本文利用有限元和實驗研究的方法，研究了氮化物涂層材料的沖蝕磨損性能，全文主要內(nèi)容和結(jié)論如下： 運用壓痕斷裂力學(xué)，對脆性材料沖蝕過程進(jìn)行了力學(xué)分析，建立了脆性材料的體積去除模型；并利用ANSYS/LS-DYNA軟件，建立了一種五顆粒的氮化物涂層的沖蝕磨損有限元模型，利用該模型對氮化物涂層的沖蝕磨損性能進(jìn)行了有限元分析。 分析了涂層結(jié)構(gòu)（厚度、過渡層）對氮化物涂層沖蝕磨損的影響，結(jié)果表明涂層的沖蝕率隨涂層厚度的增加而減小；有過渡層的涂層表現(xiàn)出更好的抗沖蝕磨損性能。 分析了涂層的機械性能（硬度H、彈性模量E）對氮化物涂層沖蝕磨損的影響，得出了涂層的沖蝕率隨彈性模量的增加而降低，隨H/E和H3/E2值的增大而減小，涂層的硬度H與彈性模量E兩項力學(xué)性能會綜合影響涂層的沖蝕磨損性能。 分析了基體彈性模量對氮化物涂層沖蝕磨損性能的影響，結(jié)果表明基體與涂層的彈性模量相當(dāng)時，涂層的抗沖蝕性能最好。 分析了環(huán)境參數(shù)（沖蝕角、沖蝕速度）對氮化物涂層沖蝕磨損的影響，結(jié)果表明涂層的沖蝕率隨沖蝕速度的增大而增大，隨沖蝕角的增大而增大，在沖蝕角為90°時沖蝕率達(dá)到最大值，涂層表現(xiàn)出典型的脆性材料沖蝕特性。 分析了磨料性能（粒徑、形狀、硬度）對氮化物涂層沖蝕磨損的影響，結(jié)果表明涂層沖蝕率隨粒徑增加而上升；隨磨料硬度的增大而增大，當(dāng)磨料硬度和涂層硬度比值Hp/Ht1時，涂層承受的是硬磨料沖蝕，沖蝕率相對較大；當(dāng)Hp/Ht1時，涂層承受到的是軟磨料沖蝕，沖蝕率相對較小；分析了磨料形狀對涂層沖蝕磨損的影響，結(jié)果表明六棱柱磨料的沖蝕能力約為球形磨料的4倍。 利用沖蝕磨損試驗機，對TiAlN涂層沖蝕磨損性能進(jìn)行了實驗研究，實驗結(jié)果表明，TiAlN涂層的沖蝕率約為硬質(zhì)合金WC/TiC/Co基體的1/4。利用光學(xué)干涉輪廓儀，觀測了TiAlN涂層沖蝕表面的宏觀形貌，實驗結(jié)果表明涂層的沖蝕輪廓呈“V”型，且輪廓較為光滑，表現(xiàn)出典型的脆性材料沖蝕特征；利用掃描電鏡，觀察了TiAlN涂層沖蝕的表面形貌和斷面形貌，，分析了TiAlN涂層的沖蝕磨損機理，結(jié)果表明TiAlN涂層沖蝕磨損機理主要為脆性疲勞斷裂和微切削。
[Abstract]:Erosion wear is one of the common wear forms in modern industrial production. The study shows that the use of nitride coating material is one of the effective ways to improve the erosion resistance of the material. In this paper, the finite element method and the experimental method are used. The erosion and wear properties of nitride coating materials are studied. The main contents and conclusions are as follows:. By using indentation fracture mechanics, the erosion process of brittle materials is analyzed, the volume removal model of brittle materials is established, and a finite element model of erosion and wear of five-particle nitride coatings is established by using ANSYS/LS-DYNA software. The erosion wear performance of nitride coating was analyzed by finite element method. The effect of coating structure (thickness, transition layer) on erosion wear of nitride coating is analyzed. The results show that the erosion rate decreases with the increase of coating thickness, and the coating with transition layer exhibits better erosion wear resistance. The effect of mechanical properties (hardness H, elastic modulus E) on erosion and wear of nitride coating is analyzed. It is concluded that the erosion rate decreases with the increase of elastic modulus and decreases with the increase of H / E and H / E _ 2 ratio. The hardness H and elastic modulus E of the coating will affect the erosive wear performance of the coating. The effect of elastic modulus of substrate on erosion and wear properties of nitride coating was analyzed. The results show that the erosion resistance of nitride coating is the best when the elastic modulus of substrate is equal to that of coating. The effect of environmental parameters (erosion angle, erosion rate) on erosion wear of nitride coating is analyzed. The results show that the erosion rate increases with the increase of erosion velocity and increases with the increase of erosion angle. The erosion rate reaches the maximum when the erosion angle is 90 擄, and the coating exhibits typical erosion characteristics of brittle materials. The effects of abrasive properties (particle size, shape, hardness) on erosion wear of nitride coating were analyzed. The results show that the erosion rate of the coating increases with the increase of particle size, and increases with the increase of abrasive hardness, when the ratio of abrasive hardness to coating hardness is Hp/Ht1. The coating is subjected to hard abrasive erosion, the erosion rate is relatively large; when Hp/Ht1, the coating is subjected to soft abrasive erosion, the erosion rate is relatively small. The effect of abrasive shape on the erosion wear of coating is analyzed. The results show that the erosion ability of hexagonal abrasive is about 4 times that of spherical abrasive. The erosion wear performance of TiAlN coating was studied by using erosion wear tester. The results show that the erosion rate of TiAlN coating is about 1 / 4 of that of cemented carbide WC/TiC/Co substrate. The macroscopic morphology of the erosion surface of TiAlN coating is observed. The experimental results show that the erosion profile of the coating is "V", and the profile is smooth, showing the typical erosion characteristics of brittle materials, and the erosion characteristics of the coating are characterized by SEM, SEM, SEM, SEM, SEM, SEM, SEM, SEM, SEM, SEM. The surface morphology and section morphology of TiAlN coating were observed and the erosion wear mechanism of TiAlN coating was analyzed. The results showed that the erosion wear mechanism of TiAlN coating was mainly brittle fatigue fracture and micro-cutting.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TB306;TH117.1

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