ASTM_F_19_-_11.pdf

Designation:F1911Standard Test Method forTension and Vacuum Testing Metallized Ceramic Seals1This standard is issued under the fixed designation F19;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers procedures for conductingtension and vacuum tests on metal-ceramic seals to determinethe bond strength of brazed,metallized ceramics.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 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 practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical Testing3.Terminology3.1 Definitions:3.1.1 The definitions of terms relating to tension testingappearing in Terminology E6,shall apply to the terms used inthis test method.4.Significance and Use4.1 This test method covers procedures for conductingtension and vacuum tests on metal-ceramic seals.4.2 This test method is not to be considered as an absolutetension test for the ceramic.4.3 This test method is suitable for quality control andresearch and development use.5.Apparatus5.1 Testing MachinesMachines used for tension testingshall conform to the requirements of Methods E4.Only loadsthat are within the loading range of the testing machine,asdefined in Methods E4,shall be used for determining tensilestrengths.5.2 Gripping DevicesVarious types of gripping devicesmay be used to apply the load to the test specimen.Thoseshown in Fig.1 are recommended,but regardless of whichgrips are used,care shall be taken that the axis of the testspecimen is in alignment with the centerline of the test machineheads.6.Preparation of Specimens6.1 Prepare the test specimen by brazing together two piecesof ceramic,shown in Fig.2,at their respective metalizedsurfaces,as described in 6.1.1 to 6.1.3:6.1.1 CeramicsGrind the test surface,A,(Fig.2)of thetwo ceramic parts flat to within 0.00025 in.(0.0064 mm)according to good grinding practice using an abrasive passingor finer than a No.100(150-m)sieve.The ground surface,A,of each part shall be parallel to shoulder C,as shown in Fig.2,consistent with the best commercial practice.The over-allappearance of each ceramic half of the test specimen shallindicate good commercial practice,and shall be free fromobvious defects.In the results of the test,report the method ofmanufacture of the specimen components,that is,slip cast,hotpressed,hydrostatically molded,etc.Measure and recordthe test surface area of each ceramic half on a projectioncomparator,or by other suitable means.Dye check the twoceramic parts and inspect them for flaws(Note 1).Reject allparts showing flaws considered conducive to abnormal failuresof either ceramic part.NOTE1A suggested dye check procedure is described in the Appen-dix.6.1.2 Metallized CoatingMetallize the specimen halvesunder identical conditions,that is,temperature,atmosphere,etc.The type of metallizing used is optional,or as mutuallyagreed upon between producer and consumer.Apply themetallizing coating only to the test surface A,Fig.2,on thespecimen.The method of metallizing is optional,that is,silkscreen,brush,spray,roller,etc.,but should be reported.1This test method is under the jurisdiction of ASTM Committee F01 onElectronics and is the direct responsibility of Subcommittee F01.03 on MetallicMaterials.Current edition approved June 1,2011.Published July 2011.Originally approvedin 1961 as F19 61 T.Last previous edition approved in 2005 as F19 64(2005)1.DOI:10.1520/F0019-11.2For referenced ASTM standards,visit the 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 NOTE2A typical metallizing procedure is described in the Appendix.NOTE1Tolerance on all dimensions shown,60.016 in.(0.41 mm).FIG.1 Self Aligning Grip for Tension TestASeal surface area to be metalized.BSurface inscribed with date as to ceramic batch and firing temperature.CGripping shoulder.FIG.2 Ceramic Half of Tension Test SpecimenF19 112 6.1.3 Assembling the Test SpecimenPlace the two matingparts in a suitable jig to achieve axial alignment of the matedceramic halves and alignment of the metallized surfaces.Accurate alignment,