1、Designation:F2094/F2094M14Standard Specification forSilicon Nitride Bearing Balls1This standard is issued under the fixed designation F2094/F2094M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in
2、parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers the establishment of the basicquality,physical/mechanical property,and test requirementsfor silicon nitride balls Classes
3、I,II,and III to be used for ballbearings and specialty ball applications.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Co
4、mbiningvalues from the two systems may result in non-conformancewith the standard.2.Referenced Documents2.1 Order of Precedence:2.1.1 In the event of a conflict between the text of thisdocument and the references herein,the text of this documenttakes precedence.Nothing in this document,however,super
5、-sedes applicable laws and regulations unless a specific exemp-tion has been obtained.2.2 ASTM Standards:2C1161 Test Method for Flexural Strength of AdvancedCeramics at Ambient TemperatureC1421 Test Methods for Determination of Fracture Tough-ness of Advanced Ceramics at Ambient Temperature2.3 ANSI
6、Standard:ANSI/ASQC Z1.4 Sampling Procedures and Tables for In-spection by Attributes32.4 ABMA Standards:STD 10 Metal Balls42.5 ASME Standard:B 46.1 Surface Texture(Surface Roughness,Waviness,andLay)52.6 ISO Standards:4505 HardmetalsMetallographic Determination of Poros-ity and Uncombined Carbon32.7
7、JIS Standards:R 1601 Testing Method for Flexural Strength(Modulus ofRupture)of High Performance Ceramics6R 1607 Testing Method for Fracture Toughness of HighPerformance Ceramics62.8 CEN Standards:EN 843-1 Advanced Technical CeramicsMonolithicCeramicsMechanical Properties at Room Temperature,Part 1.D
8、etermination of Flexural Strength7ENV 843-5 Advanced Technical CeramicsMonolithicCeramicsMechanical Properties at Room Temperature,Part 5,Statistical Analysis73.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 ball diameter variation,Vdws,nball diameter varia-tion is the differenc
9、e between the largest and smallest diametermeasured on the same ball.3.1.2 ball gage,S,nprescribed small amount by which thelot mean diameter should differ from nominal diameter,thisamount being one of an established series of amounts.A ballgage,in combination with the ball grade and nominal balldia
10、meter,should be considered as the most exact ball sizespecification to be used by a customer for ordering purposes.3.1.3 ball gage deviation,S,ndifference between the lotmean diameter and the sum of the nominal diameter and theball gage.1This specification is under the jurisdiction ofASTM Committee
11、F34 on RollingElement Bearings and is the direct responsibility of Subcommittee F34.01 onRolling Element.Current edition approved March 15,2014.Published March 2014.Originallyapproved in 2001.Last previous edition approved in 2013 as F2094/F2094M13.DOI:10.1520/F2094_F2094M-14.2For referenced ASTM st
12、andards,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.3Application for copies should be addressed to theAmerican National StandardsInstitute(AN
13、SI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4Application for copies should be addressed to the American Bearing Manufac-turers Association,1200 19th Street NW,Suite 300,Washington,DC 20036-2401.5Application for copies should be addressed to the American Society ofMechanical Engi
14、neers(ASME),ASME International Headquarters,Three ParkAve.,New York,NY 10016-5990,http:/www.asme.org.6Application for copies should be addressed to the Japanese Standards Organi-zation(JSA),4-1-24 Akasaka Minato-Ku,Tokyo,107-8440,Japan,http:/www.jsa.or.jp.7Application for copies should be addressed
15、to the British Standards Institute(BSI),389 Chiswick High Rd.,London W4 4AL,U.K.,http:/www.bsi-.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.4 ball grade,G,nspecific combination of dimensionalform and surface roughness tolerances.A
16、 ball grade is desig-nated by a grade number followed by the letter“C”indicatingSilicon Nitride Ceramic.3.1.5 blank lot,nsingle group of same-sized ball blanksprocessed together from one material lot through densification.3.1.6 ceramic second phase,nsintering additive basedphases,for example,yttria and alumina,which appear darkeror lighter than the silicon nitride matrix,but are not highlyreflective in nature when viewed under reflected light micros-copy and bright field illumination.3.1.7 color
