本文選題：TiAlN涂層刀具　切入點：微納織構(gòu)　出處：《山東大學》2017年博士論文　論文類型：學位論文

【摘要】：本文將涂層技術與微織構(gòu)技術相結(jié)合,提出了基體表面織構(gòu)化TiAlN涂層刀具的新概念。通過基體表面織構(gòu)化,可改變基體表面微觀結(jié)構(gòu),有效增加基體表面的比表面積,為涂層的涂覆提供良好的附著表面;另外,基體表面織構(gòu)化能夠改變刀-屑界面的接觸特征,最終導致涂層刀具在切削過程中的摩擦狀態(tài)發(fā)生顯著改善。通過研究TiAlN涂層刀具基體材料表面微納織構(gòu)的制備工藝,結(jié)合物理氣相沉積方法,成功制備出基體表面織構(gòu)化TiAlN涂層刀具,系統(tǒng)研究了基體表面織構(gòu)化TiAlN涂層刀具微觀結(jié)構(gòu)、力學性能、摩擦磨損性能以及切削性能等,并深入分析探討了該涂層刀具減摩作用機理�；赥iAlN涂層刀具失效機理對刀具性能的要求,提出了基體表面織構(gòu)化TiAlN涂層刀具的新概念,并分析TiAlN涂層材料與基體材料的化學、物理相容性,確定了 WC/Co硬質(zhì)合金作為TiAlN涂層刀具的基體材料。利用激光微加工技術進行了 WC/Co基體表面微納織構(gòu)的制備,分別分析了納秒和飛秒激光加工參數(shù)對所加工微織構(gòu)和納織構(gòu)表面質(zhì)量的影響及作用規(guī)律,得到了最佳的微納織構(gòu)加工工藝參數(shù)。納秒激光最佳加工參數(shù)為:泵浦電壓8 V,掃描速度15 mm/s,重復頻率7 kHz,掃描2遍,所加工的微織構(gòu)幾何尺寸為:寬度50μm,深度48.9μm;飛秒-激光最佳加工參數(shù)為:單脈沖能量2.5 μJ,掃描速度500 μm/s,掃描間距5 μm,所加工的納織構(gòu)幾何尺寸為:周期550 nm,槽深150 nm。由上述最佳微納織構(gòu)激光加工工藝參數(shù)在TiAlN涂層刀具基體表面制備出微織構(gòu)、納織構(gòu)以及微納復合織構(gòu)。利用真空陰極電弧離子鍍技術在織構(gòu)化的基體表面進行TiAlN涂層的涂覆,制備出了三種基體表面織構(gòu)化TiAlN涂層刀具,即:基體表面微織構(gòu)化TiAlN涂層刀具(MCT);基體表面納織構(gòu)化TiAlN涂層刀具(NCT);基體表面微納復合織構(gòu)化TiAlN涂層刀具(MNCT)。系統(tǒng)研究了基體表面織構(gòu)化TiAlN涂層的微觀結(jié)構(gòu)及物理機械性能,并與基體表面無織構(gòu)的TiAlN涂層(CCT)對比,結(jié)果表明:基體表面織構(gòu)化導致TiAlN涂層基體表面粗糙化、TiAlN涂層系統(tǒng)H/E值的增加,并且可在基體表面形成與TiAlN相位置相近的新物相WC1-x。另外,基體表面織構(gòu)化可顯著提高TiAlN涂層與基體界面間結(jié)合強度,這主要是由于基體表面織構(gòu)化處理能夠改變基體表面微觀結(jié)構(gòu)和晶體結(jié)構(gòu),有效提高基體表面的比表面積,為涂層的涂覆提供良好的附著表面。通過與AISI 316不銹鋼進行球-盤接觸式摩擦磨損試驗系統(tǒng)研究了基體表面織構(gòu)化TiAlN涂層的摩擦磨損性能。結(jié)果表明:與CCT試樣相比,NCT試樣的磨損壽命顯著增加,這主要是由于NCT試樣更高的膜-基結(jié)合強度;MoS2固體潤滑劑可有效降低TiAlN涂層表面摩擦系數(shù),尤其是對MCT試樣而言,與CCT試樣相比,其表面平均摩擦系數(shù)降低了 65-75%,這是由于在摩擦過程中,當涂敷在光滑表面的MoS2固體潤滑劑被完全磨掉時,摩擦副接觸表面之間相互摩擦擠壓作用可將儲存在微溝槽中的MoS2潤滑劑不斷析出補給,從而在摩擦接觸面形成MoS2潤滑層;同時,微織構(gòu)可通過撲捉、存儲磨損顆粒的作用有效減緩TiAlN涂層的磨損程度;與NCT和MCT試樣相比,MNCT試樣能夠更加顯著地改善TiAlN涂層的摩擦磨損性能,這主要歸因于基體表面微織構(gòu)與納織構(gòu)的協(xié)同作用。通過車削試驗研究了基體表面織構(gòu)化TiAlN涂層刀具切削AISI 316不銹鋼時的切削性能,由試驗結(jié)果可知基體表面織構(gòu)化可顯著提高TiAlN涂層刀具切削性能:與CCT刀具相比,MCT、NCT和MNCT刀具的切削力、刀-屑間平均摩擦系數(shù)均得到不同程度的降低,且其工件加工質(zhì)量顯著改善,其中MNCT刀具切削性能最優(yōu)。另外,與CCT刀具相比,MCT、NCT和MNCT刀具后刀面和前刀面的磨損程度得到了明顯改善,其中MNCT刀具的工件粘結(jié)現(xiàn)象最為輕微,且TiAlN涂層脫落面積最小�；w表面納織構(gòu)化與微織構(gòu)化雙重效用改善TiAlN涂層刀具切削性能的作用機理主要為:一方面,基體表面微織構(gòu)可促進切削液的滲入,充分發(fā)揮切削液的潤滑作用;同時,微織構(gòu)還可起到降低刀-屑接觸長度和捕捉磨屑的作用;另一方面,基體表面納織構(gòu)可顯著增加TiAlN涂層與基體界面結(jié)合力,降低由工件材料粘結(jié)造成的粘著磨損,保持TiAlN涂層刀具涂層表面的完整性,從而更好發(fā)揮TiAlN涂層高抗磨損性能特點,保護刀具基體。
[Abstract]:In this paper, coating technology and micro texture technology, puts forward the new concept of the surface texture of matrix TiAlN coating tool. The surface texture of the matrix, which can change the microstructure of the substrate surface, effectively increase the substrate surface area, provide good attached surface coating; in addition, the surface texture of matrix can change the tool chip interface contact characteristics, resulting in friction coated tool in cutting process has improved significantly. The preparation process through the surface of TiAlN coated tool matrix material micro nano texture, combined with physical vapor deposition method, prepared surface texture of matrix TiAlN coated tool system of surface texture the matrix of TiAlN coating microstructure, mechanical properties, friction and wear properties and cutting performance, and further discusses the mechanism of anti friction coating tool based on TiAl. N coating tool failure mechanism of tool performance, puts forward the new concept of the surface texture of matrix TiAlN coating tool, and chemical analysis of TiAlN coating material and substrate material, physical compatibility, WC/Co is determined as TiAlN hard alloy coating tool matrix material. The use of laser micro processing technology of surface micro WC/Co the preparation of nano texture, were analyzed by nanosecond and femtosecond laser processing parameters on the processing effect of texture and surface quality of micro nano texture and the role of law, the micro nano texture the best technology parameters. The optimal machining parameters for nanosecond laser pumped voltage 8 V, scanning speed of 15 mm/s, repetition rate of 7 kHz. Scan 2 times, the processing of micro texture size: width 50 m, depth 48.9 m femtosecond laser; the optimal machining parameters for single pulse energy of 2.5 J, scanning speed of 500 m/s, scanning spacing of 5 m, the Geometry processing - texture: cycle 550 nm, groove depth of 150 nm. by the best micro texture parameters of laser processing in the surface of TiAlN coated tool materials prepared by micro texture, texture and texture of nano micro nano composite coating TiAlN coating. The substrate surface plating on texture by cathodic vacuum arc ion., prepared three kinds of surface texture matrix with TiAlN coated tools, namely: surface micro texturing of TiAlN coated tools (MCT); surface nano textured TiAlN coating tool (NCT); surface micro nano composite texturing of TiAlN coated tools (MNCT). The microstructure and mechanical properties of the system the surface texture of matrix of TiAlN coating, TiAlN coating and non texture and substrate surface (CCT) comparison, the results showed that the surface texture of matrix leads to TiAlN coating substrate surface roughening, increase TiAlN coating system H/E value, and And with the TiAlN position of new similar WC1-x. also formed on the substrate surface, the surface texture of matrix of TiAlN can significantly improve the bonding strength between the coating and substrate interface, which is mainly due to the surface texture of matrix treatment can change the surface microstructure and crystal structure, effectively improve the substrate surface area, surface good adhesion for coating. Through the ball and AISI 316 stainless steel plate contact friction friction and wear properties of TiAlN coating on the surface texture of matrix wear test system. The results showed that: compared with CCT samples, the wear life of NCT samples increased significantly, which is mainly due to the NCT sample higher film substrate bonding strength; MoS2 solid lubricant can reduce the friction coefficient of TiAlN coating on the surface, especially for the MCT sample, compared with CCT samples, the average friction coefficient of the surface is reduced by 65-75 %, this is because in the process of friction, when coated on the smooth surface of MoS2 solid lubricant was completely worn off, the friction between the contact surface friction between extrusion can be stored in the lubricant MoS2 micro groove in the continuous precipitation recharge, thus forming the MoS2 layer on the contact surface lubrication friction; at the same time, through the micro texture Puzhuo, the degree of wear particles effectively reduce storage wear of TiAlN coatings; compared with NCT and MCT samples, the friction and wear properties of MNCT specimens can more significantly improve the synergistic effect of TiAlN coating, which is mainly attributed to surface micro texture and nano texture. The cutting performance of 316 stainless steel in the surface texture of matrix of TiAlN coating the cutting tool of AISI was studied through turning test, the test results show the surface texture of the substrate can significantly improve the cutting performance of TiAlN coated tools: compared with CCT, MCT NCT and MNCT cutting tool. The cutting force, tool chip between the average friction coefficient are decreased in different degree, and the machining quality is improved significantly, the cutting performance of MNCT tool optimal. In addition, compared with CCT, MCT NCT and MNCT tools, tool flank and rake face wear degree has been significantly improved, in which the workpiece bonding phenomenon the MNCT tool is slight, and the TiAlN coating off the smallest area. The mechanism of substrate surface nano textured and textured double utility to improve the cutting performance of TiAlN coated tools are: on the one hand, the substrate surface micro texture can promote cutting fluid infiltration, fully play the role of lubrication cutting fluid; at the same time, the role of micro texture it can reduce the tool chip contact length and capture debris; on the other hand, the substrate surface nano texture can significantly increase the bonding strength of TiAlN coating and substrate interface, reducing the adhesion wear by the workpiece material made by bonding To maintain the integrity of the coating surface of the TiAlN coating tool, so as to better give full play to the high anti wear properties of the TiAlN coating and to protect the tool matrix.

【學位授予單位】：山東大學
【學位級別】：博士
【學位授予年份】：2017
【分類號】：TG174.4;TG71

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