1、Designation:C162405(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 ofor
2、iginal 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-tical adhesion
3、 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,magnetic,electronic,b
4、iological)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 and a defined normal forc
5、e(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 produce a specific type/level o
6、f 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 appli-cable to a wide range of ha
7、rd 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.Testspecimens generally have a planar surface for
8、 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 engineering mea-surement of the practical(e
9、xtrinsic)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 strength,modu-lus of elasticity,damage mechanisms,mic
10、rostructure,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 than the brittle damage modes and features observedin hard
11、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 Rockwell Cdiamond stylus and specific normal force and rate parame
12、ters,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 regarded asstandard.No other units of measurement are included in this
13、standard.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 thesafety concerns,if any,associated with its use.It is theresponsibility of
14、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 sections:SectionScope1Purpose and Description1.1Applicability1.3Principal Limitations
15、1.4Organization1.51This 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.Published April 2015.Originallyapproved in 2005.Last previous edition approved in 2010 as
16、 C1624 05(2010).DOI:10.1520/C1624-05R15.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 SectionReferenced Documents2ASTM Standards2.1Other Standards and References2.2Terminology3Summary of Test Method4Significance and Use5Test Methodology and Experimental Control6Test Overview6.1Test Modes6.2Primary and Supplementary Measurements6.3Critical Scratch Load Damage Criteria and Scratch Atlas6.4Experimental Factors and Variables6.5Interfere
