1、Designation:D244275(Reapproved 2012)Standard Specification forAlumina Ceramics for Electrical and ElectronicApplications1This standard is issued under the fixed designation D2442;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the ye
2、ar 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 specification covers the requirements for fabricatedalumina parts suitable for electronic and electrical applica
3、tionsand ceramic-to-metal seals as used in electron devices.Thisstandard specifies limits and methods of test for electrical,mechanical,thermal,and general properties of the bodies usedfor these fabricated parts,regardless of part geometry.1.2 The values stated in SI units are to be regarded as thes
4、tandard.The values given in parentheses are for informationonly.2.Referenced Documents2.1 ASTM Standards:2C20 Test Methods for Apparent Porosity,Water Absorption,Apparent Specific Gravity,and Bulk Density of BurnedRefractory Brick and Shapes by Boiling WaterC108 Symbols for Heat TransmissionC242 Ter
5、minology of Ceramic Whitewares and RelatedProductsC408 Test Method for Thermal Conductivity of WhitewareCeramicsC573 Methods for Chemical Analysis of Fireclay and High-Alumina Refractories(Withdrawn 1995)3C623 Test Method for Youngs Modulus,Shear Modulus,and Poissons Ratio for Glass and Glass-Cerami
6、cs byResonanceD116 Test Methods for Vitrified Ceramic Materials forElectrical ApplicationsD149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD150 Test Methods for AC Loss Characteristics and Permit-tivity(Di
7、electric Constant)of Solid Electrical InsulationD257 Test Methods for DC Resistance or Conductance ofInsulating MaterialsD618 Practice for Conditioning Plastics for TestingD1711 Terminology Relating to Electrical InsulationD1829 Test Method for Electrical Resistance of CeramicMaterials at Elevated T
8、emperatures(Withdrawn 2001)3D2149 Test Method for Permittivity(Dielectric Constant)And Dissipation Factor Of Solid Dielectrics At Frequen-cies To 10 MHz And Temperatures To 500CD2520 Test Methods for Complex Permittivity(DielectricConstant)of Solid Electrical Insulating Materials at Mi-crowave Frequ
9、encies and Temperatures to 1650C(With-drawn 2010)3E6 Terminology Relating to Methods of Mechanical TestingE12 Terminology Relating to Density and Specific Gravityof Solids,Liquids,and Gases(Withdrawn 1996)3E122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for
10、a Characteristic of aLot or ProcessE165 Practice for Liquid Penetrant Examination for GeneralIndustryE228 Test Method for Linear Thermal Expansion of SolidMaterials With a Push-Rod DilatometerF19 Test Method for Tension and Vacuum Testing Metal-lized Ceramic SealsF77 Test Method for Apparent Density
11、 of Ceramics forElectron Device and Semiconductor Application(With-drawn 2001)3F109 Terminology Relating to Surface Imperfections onCeramicsF134 Test Methods for Determining Hermeticity of ElectronDevices with a Helium Mass Spectrometer Leak Detector(Withdrawn 1996)31This specification is under the
12、jurisdiction of Committee C21 on CeramicWhitewares and Related Products and is the direct responsibility of SubcommitteeC21.03 on Methods for Whitewares and Environmental Concerns.This specification also includes material and suggestions provided by ASTMCommittee D09 on Electrical and Electronic Ins
13、ulating Materials.Current edition approved April 1,2012.Published April 2012.Originallyapproved in 1965.Last previous edition approved in 2007 as D2442 75(2007).DOI:10.1520/D2442-75R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.o
14、rg.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.Un
15、ited States1 F417 Test Method for Flexural Strength(Modulus of Rup-ture)of Electronic-Grade Ceramics(Withdrawn 2001)32.2 Other Standards:MIL-STD-105 Sampling Procedures and Tables for Inspec-tion by Attributes4MIL-STD-883 Test Methods and Procedures for Microelec-tronics5ANSI B46.1 Surface Texture63
16、.Terminology3.1 Definitions:3.1.1 The applicable definitions of terms in the followingdocuments shall apply to this specification:Symbols C108,andDefinitions C242,D1711,E6,E12,and F109.4.Classification4.1 Ceramics covered by this specification shall be classi-fied by alumina content as follows:TypeAlumina ContentWeight percent,minI82II93III97IV995.Basis of Purchase5.1 Purchase orders for ceramic parts furnished to thisspecification shall include the following information:5.1.1 Type designation(s
