ASTM C633-2001 Standard Test Method for Adhesion or Cohesion Strength of Thermal Spray Coatings《热喷涂层的粘附力或粘结强度的标准试验方法》.pdf
《ASTM C633-2001 Standard Test Method for Adhesion or Cohesion Strength of Thermal Spray Coatings《热喷涂层的粘附力或粘结强度的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM C633-2001 Standard Test Method for Adhesion or Cohesion Strength of Thermal Spray Coatings《热喷涂层的粘附力或粘结强度的标准试验方法》.pdf(7页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C 633 01Standard Test Method forAdhesion or Cohesion Strength of Thermal Spray Coatings1This standard is issued under the fixed designation C 633; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisi
2、on. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This test method covers the determination of th
3、e degreeof adhesion (bonding strength) of a coating to a substrate or thecohesion strength of the coating in a tension normal to thesurface. The test consists of coating one face of a substratefixture, bonding this coating to the face of a loading fixture, andsubjecting this assembly of coating and
4、fixtures to a tensileload normal to the plane of the coating. It is adapted particu-larly for testing coatings applied by thermal spray, which isdefined to include the combustion flame, plasma arc, two-wirearc, high-velocity oxygen fuel, and detonation processes forspraying feedstock, which may be i
5、n the form of, wire, rod, orpowder.NOTE 1Thermal spray coating materials include ceramics, such asmetal oxides or carbides, and metals. In some cases, a coating is formedof different spray materials, such as an oxide layer sprayed onto a sprayedmetal-bonding layer. The substrate generally is a metal
6、, but may be aceramic, such as an oxide or graphite.1.2 Usually this test method is performed at ambient tem-perature. Higher temperature testing is restricted by the needfor a suitable adhesive bonding agent. For certain fundamentalinvestigations, it is suggested that very low (cryogenic) tem-perat
7、ure be used.1.3 This test method is limited to testing thermal spraycoatings that can be applied in thickness greater than 0.015 in.(0.38 mm). The limitation is imposed because an adhesivebonding agent is used in the test. Those bonding agentsestablished so far for this method tend to penetrate ther
8、malspray coatings and may invalidate results unless the coatingsare thick enough to prevent penetration through the coating.Further development may establish that thin layers of certaintypes of especially dense coatings may be tested satisfactorily.Alternatively, new adhesive bonding agents that wou
9、ld allowreduction of the minimum thickness limitation may becomeavailable.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health limitations prior to us
10、e.2. Referenced Documents2.1 ASTM Standards:E 4 Practices for Force Verification of Testing Machines23. Significance and Use3.1 This test method is recommended for quality control,acceptance testing; or it may help to develop or qualify athermal spray operators equipment and procedure or to aid inde
11、veloping thermal spray coatings with improved adhesion andintegrity.3.2 This test method is useful for comparing adhesion orcohesion strengths of coatings of similar types of thermal spraymaterials. The test should not be considered to provide anintrinsic value for direct use in making calculations,
12、 such as todetermine if a coating will withstand specific environmentalstresses. Because of residual stresses in thermal spray coatings,actual strength depends upon the shape of the particular coatedpart. Also, in use, a coating may be stressed in a more complexmanner than is practical for a standar
13、d test.4. Apparatus4.1 A tension testing machine shall conform to the require-ments of Practices E 4. The loads used in determining theadhesion or tensile strength shall be within the loading range ofthe testing machine, as defined in Practices E 4. Permissiblevariation shall be less than 1.0 %. It
14、shall be possible to applyincreasing tensile load at a constant rate of cross-head travelbetween 0.030 in./min (0.013 mm/s) and 0.050 in./min (0.021mm/s). The machine shall include a load-indicating device thatregisters the maximum load applied before rupture occurs.4.2 Self-aligning devices, for ap
15、plying the tensile load to theassembly of the coating and fixtures, shall not permit eccentricload or bending moment to the specimen. Self-alignment isoften provided by the manufacturer as an integral part of thetesting machine. An alternative, satisfactory apparatus is shownin Fig. 1, which also sh
16、ows methods of connecting theself-aligning apparatus to an assembled test specimen.5. Material5.1 Adhesive Bonding AgentA suitable adhesive bonding1This test method is under the jurisdiction of ASTM Committee B08 on Metallicand Inorganic Coatingsand is the direct responsibility of Subcommittee B08.1
17、2 onMaterials for Porcelain Enamel and Ceramic-Metal Systems.Current edition approved March 10, 2001. Published July 2001. Originallypublished as C 633 69. Last previous edition C 633 79 (1999).2Annual Book of ASTM Standards, Vol 03.01.1Copyright ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19
18、428-2959, United States.agent shall be agreed between the purchaser and manufacturerof the coating and shall meet the following requirements.35.1.1 The bonding agent shall be capable of bonding thecoating to the loading fixture with a tensile strength that is atleast as great as the minimum required
19、 adhesion and cohesionstrength of the coating.5.1.2 The bonding agent shall be sufficiently viscous not topenetrate through a 0.015-in. (0.38-mm) thickness of thecoating. Certain commercial resins that cure or harden at roomtemperature by means of a curing agent have been provensatisfactory. If any
20、other bonding agent is to be used, it shallfirst be compared with a proven bonding agent using this testmethod with the desired thermal spray coating.NOTE 2Thermal spray coatings may have an inherent porosity.Excessive penetration of the adhesive bonding agent into this porositymay affect the result
21、s determined by this test method. Unless provedsatisfactory by comparison testing, any agent requiring elevated tempera-ture for curing should be avoided because viscosity may decrease at hightemperature, allowing penetration.NOTE 3When liquid epoxy bonding agents are used, there should bea procedur
22、e in place to ensure relatively consistent thickness on everysample.5.1.3 The adhesion strength of the bonding agent shall bedetermined each time this test method is performed. This shallbe done by using the bonding agent to attach a loading fixtureto a second loading fixture, in accordance with 6.5
23、, except thatthe coated substrate fixture of 6.5 is replaced with the secondloading fixture.NOTE 4One reason for testing the bonding agent each time is to detectimproper preparation of the agent if it is a two-part mix. Another reasonis that adhesion strength generally decreases with age of the unus
24、ed agent.If strength is lower than required, more adhesive bonding agent shall beprepared and tested, or the agent shall be discarded and replaced.6. Test Specimens6.1 Substrate and Loading FixturesEach test specimen isan assembly comprising a substrate fixture, to which the3A list of satisfactory b
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