ASTM F2094 F2094M-2011 Standard Specification for Silicon Nitride Bearing Balls《氮化硅轴承滚珠标准规范》.pdf
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1、Designation: F2094/F2094M 11Standard 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 numb
2、er in 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 bal
3、ls Classes 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
4、 of the other. Combiningvalues 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 test of thisdocument and the references herein, the text of this documenttakes precedence. Nothing in this do
5、cument, however, super-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 Ambien
6、t Temperature2.3 ANSI Standard:ANSI/ASQC Z1.4 Sampling Procedures and Tables forInspection 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
7、 Uncombined Carbon32.7 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
8、Room Temperature,Part 1. Determination 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)ball diameter
9、 varia-tion is the difference between the largest and smallest diametermeasured on the same ball.3.1.2 ball gage (S)prescribed 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
10、 ball grade and nominal balldiameter, should be considered as the most exact ball sizespecification to be used by a customer for ordering purposes.3.1.3 ball gage deviation (DS)difference between the lotmean diameter and the sum of the nominal diameter and theball gage.3.1.4 ball grade (G)specific c
11、ombination of dimensionalform and surface roughness tolerances. A ball grade is desig-nated by a grade number followed by the letter “C” indicatingSilicon Nitride Ceramic.1This specification is under the jurisdiction ofASTM Committee F34 on RollingElement Bearings and is the direct responsibility of
12、 Subcommittee F34.01 onRolling Element.Current edition approved May 1, 2011. Published May 2011. Originallyapproved in 2001. Last previous edition approved in 2008 as F2094/F2094M 08.DOI: 10.1520/F2094_F2094M-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Cus
13、tomer 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 (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http:/w
14、ww.ansi.org4Application 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 Engineers (ASME), ASME International Headquarters, Thr
15、ee 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 to the British Standards Institute(BSI
16、), 389 Chiswick High Rd., London W4 4AL, U.K., http:/www.bsi-.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.5 blank lotsingle group of same-sized ball blanksprocessed together from one material lot through densification.3.1.6 d
17、eviation from spherical form (DRw)greatest radialdistance in any radial plane between a sphere circumscribedaround the ball surface and any point on the ball surface.3.1.7 finish lotsingle group of same-sized balls (whichmay be derived from multiple blank lots of the same materiallot) processed toge
18、ther through finishing.3.1.8 lot diameter variation (Vdwl)difference between themean diameter of the largest ball and that of the smallest ballin the lot.3.1.9 lot mean diameter (Dwml)arithmetic mean of themean diameter of the largest ball and that of the smallest ballin the lot.3.1.10 material lots
19、ingle process lot of silicon nitride rawpowder received from a material supplier.3.1.11 mean diameter of a ball (Dwm)arithmetic mean ofthe largest and the smallest actual single diameters of the ball.3.1.12 nominal diameter (Dw)size ordered that is thebasis to which the nominal diameter tolerances a
20、pply. Thenominal diameter is specified in inches or millimeters (decimalform).3.1.13 nominal diameter tolerancemaximum allowabledeviation from true specified nominal diameter for the indi-cated grade.3.1.14 single diameter of a ball (Dws)the distance be-tween two parallel planes tangent to the surfa
21、ce of the ball.3.1.15 surface roughness (Ra)surface irregularities withrelative small spacings, which usually include irregularitiesresulting from the method of manufacture being used or otherinfluences, or both.3.1.16 unit containercontainer identified as containingballs from the same manufacture l
22、ot of the same composition,grade, and nominal diameter, and within the allowable diam-eter variation per unit container for the specified grade.4. Classification4.1 Silicon nitride materials for bearing and specialty ballapplications are specified according to the following materialclasses (see Appe
23、ndix X1 for typical current applications):4.1.1 Class IHighest grade of material in terms of prop-erties and microstructure. Suitable for use in the most demand-ing applications. This group adds high reliability and durabilityfor extreme performance requirements.4.1.2 Class IIGeneral class of materi
24、al for most bearingand specialty ball applications. This group addresses theconcerns of ball defects as is relative to fatigue life, levels oftorque, and noise.4.1.3 Class IIILower grade of material for low dutyapplications only. This group of applications primarily takesadvantage of silicon nitride
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