Coating & Reconditioning - Guhring

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nano-layer coatingsTiAlN top layernano layer zoneTiN base layerStructure of nano layering -each layer is only a fewnanometers thicknano-FIREX ® coatingThe newest generation of PVD coatings incorporates the heat resistance andshock resistance of a traditional multi-layer coating such as FIREX ® but with arevolutionary micro layering PVD process that imparts a structure that is moreuniform and cohesive. These micro-layered coatings are referred to as nanocoatings,and have some unique and beneficial properties which can improveperformance and dramatically increase tool life in cutting tools and wear parts.nano-FIREX ®FIREX ® coating is a PVD hard coating which combines the heat and wearresistance of TiAlN with the universal applicability of TiN coating, all in amulti-layer structure. The TiAlN in the structure increases the oxidationtemperature (the point at which the coating combines with oxygen in theatmosphere and begins to break down), or operating temperature, to 1470° F.This is much higher than TiCN, which has an oxidation temperature of 840° F.Another property of TiAlN coating is that at elevated temperatures the coatingwill have a surface hardness of approximately 3,300 (HV 0.05), which ismore than 3 times the hardness of TiCN. The multi-layering approach thatcombines TiAlN with TiN provides increased resistance to shock which cancrack standard mono or single layer coatings.Guhring’s nano-FIREX has the same TiAlN/TiN components as standardFIREX, but in a new micro-layered structure. nano-FIREX has significantlymore micro-layers in the same overall thickness than the original FIREX. Thisimparts superior wear characteristics, especially in applications where shockresistance is a major consideration.MolyGlide ®Initially developed for dry machining applications, MolyGlide is used inapplications where increased lubricity or a very low coefficient of frictionwill be beneficial. MolyGlide is a MoS 2based coating that is applied in aPVD process. This unique coating is sometimes referred to as Teflon ® -likein that nothing sticks to the coating. MolyGlide can be applied on uncoatedsurfaces such as injection mold parts, or on top of any hard coatings suchas TiN, TiAlN and FIREX, where MolyGlide can act as a barrier to materialgalling while the base hard coating can provide heat and wear resistance.Dry machining applications are a natural fit but many tapping and reamingapplications can also benefit from MolyGlide coating, especially whenmachining aluminum or other “gummy” materials.nano-A ®Guhring’s newest PVD applied nano coating is nano-A ® coating. nano-A is amulti-layer coating that combines TiAlN and AlTiN coatings in a micro-layerstructure that is harder and more wear resistant. Whereas TiAlN coating hasan oxidation temperature of approximately 1470° F, AlTiN coating has an oxidationtemperature of approximately 1650° F, and the hardness is increasedto 3,800 (HV 0.05). The micro-layer structure of nano-A makes this a betterchoice for applications where AlTiN would normally be used, such as hardmilling steel and materials over 45 HRC; but test results have also shownthat nano-A is frequently the best coating for high speed drilling and millingof all grades of stainless steels including 300 and 400 series grades.Another unique coating from Guhring:nano-Si ®Guhring’s coatings research department has developeda new nano multi-layer coating for nickel base materialsand hardened materials that require high surface hardnesscoatings. Called nano-Si ® , this TiAlSiN (titanium aluminumsilicon nitride) based coating is designed to yield similarperformance to diamond-like coatings without the restrictionson the host base material substrate. With a hardness valueof 5,500 (HV 0.05), nano-Si ® stands up to the most abrasiveapplications. The oxidation, or maximum useful operatingtemperature, is over 1,470º F, which is similar to hightemperature coatings such as FIREX ® or TiAlN.Test results in drilling inconel have shown a 35% increase intool life compared to a comparable TiAlN based multi-layercoating using the same operating parameters. Similar resultswere found when machining cast iron and hardened steels over52HRc.No other coating can provide this high hardness property while stillretaining the toughness required in drilling and milling applications.
PVD coatingsKey characteristicsTypeIdentifyingColorCoatingProcessCoatingTemperatureLayerStructureThickness(µm)Nanohardness(HV 0.05)FrictionCoefficient(fetting)ThermalStabilityTiNTitanum NitrideHard •Wear-resistantGoldPVDPhysical VaporDepositionn930º F500º CMonolayer 1.5 - 4.0 2400 0.501100º F595º CTiCNTitanumCarbonitrideHard •Wear-resistantGray VioletPVDPhysical VaporDeposition930º F500º CGradient 1.5 - 5.0 3000 0.25840º F450º CTiAlNTiatniumAluminum NitrideHard •Wear-resistantBlack VioletPVDPhysical VaporDeposition930º F500º CMonolayer 1.5 - 4.0 3300 0.501470º F800º CFIREX ®Special TiN-TiAlNHard •Wear-resistantRed VioletPVDPhysical VaporDeposition930º F500º CMultilayer 1.5 - 5.0 3000-3300 0.501470º F800º Cnano-FIREX ®Special TiN-TiAlNHard •Wear-resistantRed VioletPVDPhysical VaporDeposition930º F500º CMultilayer 1.5 - 4.0 3000-3300 0.501470º F800º CSuper-A Aluminum TitaniumNitrideHard •Wear-resistantDark GrayPVDPhysical VaporDeposition930º F500º CMonolayer 1.5 - 4.0 3800 0.601650º F900º Cnano-A Aluminum TitaniumNitrideHard •Wear-resistantDark GrayPVDPhysical VaporDeposition930º F500º CMonolayer 1.5 - 4.0 3800 0.601650º F900º CMolyGlide ®MoS 2-BasedSoft •LubricatingSilverPVDPhysical VaporDeposition305º F150º CMonolayer 1.0 n.a. 0.101470º F800º Cnano-Si ®Hard •Wear-resistantBronzePVDPhysical VaporDeposition930º F500º CMultilayer 1.5 - 5.0 5500 0.551470º F800º CVisit www.guhring.com/PS/Coating for further details
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Coating & Reconditioning - Guhring

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