1、Designation:D244275(Reapproved 2020)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.Thisspecification 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
4、standard.The values given in parentheses after SI units areprovided for information only and are not considered standard.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelo
5、pment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C20 Test Methods for Apparent Porosity,Water Absorption,Apparent Specific Gravity,and Bulk Density of BurnedRefractor
6、y Brick and Shapes by Boiling WaterC108 Symbols for Heat TransmissionC242 Terminology 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Thermal Conductivity of WhitewareCeramicsC573 Methods for Chemical Analysis of Fireclay and High-Alumina Refractories(Withdrawn 1995)3C623 Test Method f
7、or Youngs Modulus,Shear Modulus,and Poissons Ratio for Glass and Glass-Ceramics byResonanceD116 Test Methods for Vitrified Ceramic Materials forElectrical ApplicationsD149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power
8、FrequenciesD150 Test Methods for AC Loss Characteristics and Permit-tivity(Dielectric Constant)of Solid Electrical InsulationD257 Test Methods for DC Resistance or Conductance ofInsulating MaterialsD618 Practice for Conditioning Plastics for TestingD1711 Terminology Relating to Electrical Insulation
9、D1829 Test Method for Electrical Resistance of CeramicMaterials at Elevated Temperatures(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(Di
10、electricConstant)of Solid Electrical Insulating Materials at Mi-crowave Frequencies and Temperatures to 1650CE6 Terminology Relating to Methods of Mechanical TestingE12 Terminology Relating to Density and Specific Gravityof Solids,Liquids,and Gases(Withdrawn 1996)3E122 Practice for Calculating Sampl
11、e Size to Estimate,WithSpecified Precision,the Average for a Characteristic of aLot or ProcessE165/E165M Practice for Liquid Penetrant Testing for Gen-eral IndustryE228 Test Method for Linear Thermal Expansion of SolidMaterials With a Push-Rod DilatometerF19 Test Method for Tension and Vacuum Testin
12、g Metal-lized Ceramic SealsF77 Test Method for Apparent Density 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
13、Leak Detector(Withdrawn 1996)3F417 Test Method for Flexural Strength(Modulus of Rup-ture)of Electronic-Grade Ceramics(Withdrawn 2001)31This specification is under the jurisdiction of Committee C21 on Electrical andElectronic Insulating Materials.Current edition approved Nov.1,2020.Published December
14、 2020.Originallyapproved in 1965.Last previous edition approved in 2016 as D2442 75(2016).DOI:10.1520/D2442-75R20.2For 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 sta
15、ndards 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.United StatesThis international standard was developed in accordance with
16、 internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.12.2 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.Terminology3.1 Definitions:3.1.1 The applicable definitions o
