第八章硬質(zhì)膜

1、HSS30GPa結(jié)合力：結(jié)合力：60N5mmWC球，球，40N加載，加載，200mm/s,1小時無明顯小時無明顯磨損磨損與與TiN比，比，CrTiAlN鉆孔鉆孔數(shù)可多數(shù)可多1倍左右倍左右CrTiAlNWorkpiece Material: Plain Carbon Steel (EN9) 190 HVTool: Tungsten Carbide Drills (6.4 mm )CoatingNumber of HolesCrTiAlN328Uncoated 73185rpm (64m/min) & 0.30mm/rev lubricated: 7.5% oil concentrated

2、 water based coolantHoles: Through (19mm deep)Drilling PerformanceCrTiAlNWorkpiece Material: Alloy Steel EN24 363HVTool: High Speed Steel (1/4” drills) Holes: Through (12.6 mm deep)2440rpm (48.7m/min) & 0.11mm/rev & 268mm/min lubrication: 7.5% oil concentrated water based coolantCoatingNumbe

3、r of HolesCrTiAlN232Uncoated 0Drilling PerformanceCrAlTiN Cr/Ti在相當寬范圍在相當寬范圍 內(nèi)穩(wěn)定的硬度、結(jié)合力內(nèi)穩(wěn)定的硬度、結(jié)合力 PoD, 5 mm WC/Co ball, 200 mms-1CrTiAlN Cr/Ti在相當寬范圍在相當寬范圍 內(nèi)穩(wěn)定摩擦磨損性能內(nèi)穩(wěn)定摩擦磨損性能 UncoatedCommercial TiNCrTiAlNCrTiAlN+MoSTS1S2S3S4050100150200250300350No. Holes CompletedHV153HV147HV14410413217418320522628834

4、5Hardness(HV) of EN9Test BlockDrilling Speed:4050 rpm, (equivalent to 80m/min) Feed: 945mm/min Conditions: Through hole, 20mmCoolant: Cimstar MB603, 5%, Drill testSamplesOne foldTwo foldThree foldCrAlTiCr Coating Deposition- CFUMSIP - 1 Ti, 1 Al, 2 Cr- Ar- N2 OEM control loopDeposition ProcessCrTiAl

5、N多層膜多層膜復合的方法除多復合的方法除多元外可形成多層，元外可形成多層，層厚可降至納米，層厚可降至納米，成為成為納米調(diào)幅結(jié)納米調(diào)幅結(jié)構(gòu)。構(gòu)。TiN/NbN多層多層5nmCrTiAlN 鍍程序 CrNCrTiAlNSubstrate 高速鋼基體高速鋼基體1200 目拋光目拋光Cr bond layer0.2 m Cr底層底層Graded layer0.3 m CrTiAlN梯度層梯度層Nanolayers4 m CrTiAlN多層多層, ,其中其中10nm 15nm, CrN層層 6.0nm25nmQuelle: A: Matthews, University of Hull, UKA. Ma

6、tthews, University of Hull, U.K.Fracture Toughnes of a single- and multi- layer Multilayers with a modulation of elastic moduli hinder the cracks propagation65%Ti，35%Al的TiAlN和WC形成調(diào)幅結(jié)構(gòu)，波長為10-20nm在TiN的底層上沉積TiAlN/WC白色為TiAlN黑色WCRenucleation at the incoherent interfaceTiN+AlTiN和CrN+TiN調(diào)幅周期與硬度理論曲線Buffer l

7、ayer decreases residual stressBuffer thickness on scratch results摩擦系數(shù)和層數(shù)關(guān)系 多層的摩擦模型Surface and Coatings Technology 163 .164 (2003) 571.577Cr+CrN層薄，磨損量低MonoMulti納米晶超硬膜納米晶超硬膜納米復合納米復合超硬膜結(jié)超硬膜結(jié)構(gòu)示意圖構(gòu)示意圖納米晶與納米晶與非晶結(jié)構(gòu)非晶結(jié)構(gòu)納米復合納米復合TiN晶粒尺寸與硬度關(guān)系晶粒尺寸與硬度關(guān)系Ti-Cu-N多元膜中Cu%與硬度關(guān)系由于形成納米復合結(jié)構(gòu)，軟金屬加入也可由于形成納米復合結(jié)構(gòu)，軟金屬加入也可提高硬質(zhì)膜

8、硬度提高硬質(zhì)膜硬度Grain size vs. Cu% in Ti-Cu-NTiN199719931990PVD Coating Development19851987TiCN, CrNTiAlNWC/C and MoS2C and DLC (new generation)2000TiAlSiN, super-lattice Hard Coatings: (TiN, TiCN, CrN, TiAlN,.)uUses: cutting and forming applicationsuLess efficient : Wear ProtectionuWhy?: High , abrasive d

9、ue to hardness and surface roughnessDLCuProperties: Hard, lower friction. mechanical component applicationsuUses: low since the coatings introductionuProblems:uHardness brittlenessuLow adhesion level load bearing capacity limitedHard coatingsLubricant coatingsMe-CHProperties: Less hard, less brittle

10、, very good adhesion, medium load bearing capacity, low friction ( 0.15).Self-Lubricants Based on MoS2(MoST) and C (Graphit-iC)uWear protection: Necessary to use a true solid lubricant to enable the protection of the opposite surface by formation of a transfer layer. uUses:MoS2: vacuum only, low loaduUses: Graphite: used in most