1、Designation: C1624 05 (Reapproved 2015)Standard Test Method forAdhesion Strength and Mechanical Failure Modes ofCeramic Coatings by Quantitative Single Point ScratchTesting1This standard is issued under the fixed designation C1624; the number immediately following the designation indicates the year
2、oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of the prac-tic
3、al adhesion strength and mechanical failure modes of hard(Vickers Hardness HV = 5 GPa or higher), thin (30 m)ceramic coatings on metal and ceramic substrates at ambienttemperatures. These ceramic coatings are commonly used forwear/abrasion resistance, oxidation protection, and functional(optical, ma
4、gnetic, electronic, biological) performance im-provement.1.2 In the test method, a diamond stylus of defined geometry(Rockwell C, a conical diamond indenter with an includedangle of 120 and a spherical tip radius of 200 m) is drawnacross the flat surface of a coated test specimen at a constantspeed
5、and a defined normal force (constant or progressivelyincreasing) for a defined distance. The damage along thescratch track is microscopically assessed as a function of theapplied force. Specific levels of progressive damage areassociated with increasing normal stylus forces. The forcelevel(s) which
6、produce a specific type/level of damage in thecoating are defined as a critical scratch load(s).The test methodalso describes the use of tangential force and acoustic emissionsignals as secondary test data to identify different coatingdamage levels.1.3 Applicability to CoatingsThis test method is ap
7、pli-cable to a wide range of hard ceramic coating compositions:carbides, nitrides, oxides, diamond, and diamond-like carbonon ceramic and metal substrates. The test method, as definedwith the 200 m radius diamond stylus, is commonly used forcoating thicknesses in the range of 0.1 to 30 m. Testspecim
8、ens generally have a planar surface for testing, butcylinder geometries can also be tested with an appropriatefixture.1.4 Principal Limitations:1.4.1 The test method does not measure the fundamentaladhesion strength of the bond between the coating and thesubstrate. Rather, the test method gives an e
9、ngineering mea-surement of the practical (extrinsic) adhesion strength of acoating-substrate system, which depends on the complexinteraction of the test parameters (stylus properties andgeometry, loading rate, displacement rate, and so forth) and thecoating/substrate properties (hardness, fracture s
10、trength, modu-lus of elasticity, damage mechanisms, microstructure, flawpopulation, surface roughness, and so forth).1.4.2 The defined test method is not directly applicable tometal or polymeric coatings which fail in a ductile, plasticmanner, because plastic deformation mechanisms are verydifferent
11、 than the brittle damage modes and features observedin hard ceramic coatings. The test method may be applicable tohard metal coatings which fail in a brittle mode with appro-priate changes in test parameters and damage analysis proce-dures and criteria.1.4.3 The test method, as defined with the Rock
12、well Cdiamond stylus and specific normal force and rate parameters,is not recommended for very thin (30 m). Such coatings may require different stylusgeometries, loading rates, and ranges of applied normal forcefor usable, accurate, repeatable results.1.4.4 The values stated in SI units are to be re
13、garded asstandard. No other units of measurement are included in thisstandard. Test data values in SI units (newtons (N) for forceand millimetres (mm) for displacement) are to be considered asstandard and are in accordance with IEEE/ASTM SI 10.1.4.5 This standard does not purport to address all of t
14、hesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.5 OrganizationThe test method is organized into thefollowing sectio
15、ns:SectionScope 1Purpose and Description 1.1Applicability 1.3Principal Limitations 1.4Organization 1.51This test method is under the jurisdiction of ASTM Committee C28 onAdvanced Ceramics and is the direct responsibility of Subcommittee C28.04 onApplications.Current edition approved Jan. 1, 2015. Pu
16、blished April 2015. Originallyapproved in 2005. Last previous edition approved in 2010 as C1624 05(2010).DOI: 10.1520/C1624-05R15.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1SectionReferenced Documents 2ASTM Standards 2.1Other Sta
17、ndards and References 2.2Terminology 3Summary of Test Method 4Significance and Use 5Test Methodology and Experimental Control 6Test Overview 6.1Test Modes 6.2Primary and Supplementary Measurements 6.3Critical Scratch Load Damage Criteria and Scratch Atlas 6.4Experimental Factors and Variables 6.5Int
18、erferences 7Material and Specimen Related 7.2Test Method Related 7.3Apparatus 8General Description 8.1Stylus and Stylus Mounting 8.2Mechanical Stage and Displacement Control 8.3Test Frame and Force Application System 8.4Force and Displacement Sensors 8.5Optical Analysis and Measurement 8.6Data Acqui
19、sition and Recording 8.7Acoustic Emission (Optional) 8.8Coating Adhesion Reference Specimens (Optional) 8.9Coating Surface Profilometry (Optional) 8.10Data Analysis and Output Software (Optional) 8.11Test Specimens 9Specimen Requirements 9.1Specimen Characterization 9.2Specimen Size 9.3Specimen Flat
20、ness and Level 9.4Polishing (Optional) 9.5Specimen Exposure Conditioning (Optional) 9.6Specimen Cleaning 9.7Specimen Handling and Storage 9.8Calibration 10System Calibration 10.1Reference Specimens 10.2Test Procedure 11Calibration 11.1Test Mode Selection 11.2Test Planning 11.3Stylus Inspection and C
21、leaning 11.4Environmental Conditions 11.5System Set-Up and Check 11.6Test Specimen Mounting 11.7Conducting the Test 11.8Specimen Count 11.9Invalid and Censored Data 11.10Scratch Damage Assessment 11.11Calculations 12Report 13Test Identification 13.2Specimen Information 13.3Test Equipment and Procedu
22、re Information 13.4Test Data and Statistics 13.5Precision and Bias 14Keywords 15Rockwell Diamond Indenter Specifications Annex A1Alignment and Calibration Annex A2Repeatability and Reproducibility Studies Annex A3Coating Damage Criteria and Scratch Atlas Appendix X1Experimental Variables in Scratch
23、Adhesion Testing Appendix X2Bibliography2. Referenced Documents2.1 ASTM Standards:2B659 Guide for Measuring Thickness of Metallic and Inor-ganic CoatingsE4 Practices for Force Verification of Testing MachinesE18 Test Methods for Rockwell Hardness of Metallic Ma-terialsE750 Practice for Characterizin
24、g Acoustic Emission Instru-mentationE1316 Terminology for Nondestructive ExaminationsE1932 Guide for Acoustic Emission Examination of SmallPartsIEEE/ASTM SI 10 Standard for Use of the InternationalSystem of Units (SI) (The Modern Metric System)2.2 ASME Standard:3ASME B46.1 Surface Texture (Surface R
25、oughness,Waviness, and Lay)2.3 CEN Standard:4CEN prEN 1071-3 Advanced Technical CeramicsMethods of Test for Ceramic CoatingsPart 3: Determi-nation Of Adhesive And Other Mechanical Failure ModesBy A Scratch Test3. Terminology3.1 Definitions:3.1.1 acoustic emission, nclass of phenomenon in whichelasti
26、c waves are generated by the rapid release of energy fromlocalized sources within a material, or the transient waves sogenerated. E13163.1.2 adhesive failure, ndetachment and separation of acoating from the substrate with cracking and debonding at thecoating-substrate interface.3.1.3 cohesive failur
27、e, nmaterial damage and cracking inthe coating or in the substrate, separate and distinct fromdetachment and adhesive debonding at the coating-substrateinterface.3.1.4 critical scratch load (LCN), napplied normal force atwhich a specific, well-defined, recognizable damage/failureevent occurs or is o
28、bserved in the scratch test of a specificcoating on a specific substrate.3.1.4.1 DiscussionThe subscript N is used to identifyprogressive failure events. For example, LC1is often used toidentify the first level of cohesive failure in the coating itself;LC2is often used to identify first adhesive fai
29、lure between thecoating and the substrate. Multiple subscripts can be used forprogressive levels of distinct damage in a specific coating-substrate systems.3.1.5 fundamental adhesion, nsummation of all interfacialintermolecular interactions between a film or coating and itssubstrate.3.1.6 normal for
30、ce (LN), nin a scratch test, the forceexerted by the stylus, perpendicular to the test surface of thetest specimen.3.1.7 practical adhesion, nforce or work required toremove or detach a film or coating from its substrate irrespec-tive of the locus of failure.2For referenced ASTM standards, visit the
31、 ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three
32、 Park Ave., New York, NY 10016-5990, www.as-me.org.4Available from European Committee for Standardization (CEN), 36 rue deStassart, B1050 Brussels, www.cenorm.be.C1624 05 (2015)23.1.7.1 Discussion“Practical adhesion” is a test conceptwhich uses various engineering coating adhesion test methodsto obt
33、ain a quantitative, reproducible adhesion measurementwhich can be related to the functional performance of thecoating. The practical adhesion is an extrinsic property whichdepends on the complex interaction of coating/substrate prop-erties and characteristics with the specific test parameters.3.1.8
34、stylus drag coeffcient, nin scratch testing, the di-mensionless ratio of the tangential force to the normal forceapplied to the stylus at a specific point in the scratch test.3.1.8.1 DiscussionThe term stylus drag coefficient is pre-ferred to the more common term scratch coefficient of friction(SCF)
35、. The tangential force is primarily a measure of theperpendicular force required to plow the indenter through thecoating, rather than to slide it on the surface (sliding friction isa relatively minor contribution to the measured tangential forceunless penetration is very small and surface properties
36、 domi-nate). Thus the term friction coefficient is not appropriate forthese stylus scratch tests. The SCF term is too easily misun-derstood or misused as a measurement of sliding friction.3.1.9 tangential force (LT), nforce that opposes the rela-tive motion between a moving stylus and the surface th
37、at isbeing scratched by the stylus and which is perpendicular to thenormal force exerted by the stylus (also called the frictionforce, drag force, or the scratching force).4. Summary of Test Method4.1 This test consists of producing and assessing controlleddamage in a hard ceramic coating by single
38、point scratch action(see Fig. 1). The scratch is developed on a coated test specimenby drawing a diamond stylus of defined geometry and tip size(Rockwell C, 200 m radius) across the flat surface of thespecimen at a constant speed and a controlled and measurednormal force (constant or progressively i
39、ncreasing). Withincreasing applied normal force, the stylus produces progres-sive mechanical damage in the coating and the substratethrough the complex combination of elastic/plastic indentationstresses, frictional forces, and residual internal stresses in thecoating/substrate system (Fig. 2).4.2 Th
40、e specific levels and types of progressive damage inthe scratch track are assessed and associated with the appliednormal stylus forces. The normal force which produces aspecific, defined, reproducible type/level of damage is definedas a critical scratch load (LC). For a given coating-substratesystem
41、, one or more different critical scratch loads (LCN) canbe defined for progressive levels of defined coating damage.4.3 Coating damage is assessed by optical microscopy orscanning electron microscopy, or both, during or after thescratch test is done. The tangential force and acoustic emissionsignals
42、 can also be measured and recorded during the scratchtest process and used as supplementary test data to identifydifferent coating damage levels. In commercial instruments,computerized electronic systems are commonly used to apply,control, measure, and record the force signals and acousticemission s
43、ignals and to control the stylus-specimen movement.4.4 The two primary modes of scratch adhesion testing areconstant load and progressive load. In constant load (CL)scratch testing, the normal force on the stylus is maintained ata constant level as the stylus moves in relation to the testspecimen su
44、rface. Sequential scratch tests are done at increas-ing force increments to determine the critical scratch load fora given damage level.NOTE 1Test systems may have either a movable stage or a movablestylus with the alternate component in a fixed position.4.5 In progressive load (PL) scratch tests, t
45、he applied stylusforce is linearly increased to a defined maximum force as thestylus moves in relation to the test specimen surface.4.6 The critical scratch loads at which a defined coatingfailure event occurs depend on a complex interaction ofcoating-substrate properties and test parameters/conditi
46、ons. Itis the purpose of this test standard to: (1) describe and definethe test equipment and procedures and the major and minorcoating-substrate properties which have to be controlled,measured, and understood to produce reliable, comparablecoating adhesion test data, and (2) define a report format
47、thatwill provide complete and accurate test data.5. Significance and Use5.1 This test is intended to assess the mechanical integrity,failure modes, and practical adhesion strength of a specificFIG. 1 Test Method SchematicFIG. 2 Schematic Example of Progressive Damage in ScratchTrack in a Progressive
48、 Load Scratch TestC1624 05 (2015)3hard ceramic coating on a given metal or ceramic substrate.The test method does not measure the fundamental “adhesionstrength” of the bond between the coating and the substrate.Rather, the test method gives a quantitative engineering mea-surement of the practical (e
49、xtrinsic) adhesion strength anddamage resistance of the coating-substrate system as a functionof applied normal force. The adhesion strength and damagemodes depend on the complex interaction of the coating/substrate properties (hardness, fracture strength, modulus ofelasticity, damage mechanisms, microstructure, flawpopulation, surface roughness, and so forth) and the testparameters (stylus properties and geometry, loading rate,displacement rate, and so forth).5.2 The quantitative coating adhesion scratch test is asimple, practical, and rapid test. Howev
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