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【正文】 — 109 Spodumene (Li2OAl2O3SiO2) — 1011 Boron nitride (BN) 1014 Silicon nitride (Si3N4) 101314 Pyroceram 1012 Glassbonded mica 1014 Mica 1016 Glass (Na2OCaOSiO2) 1012 Quartz (SiO2) 101418 PbAl silicate 1013 Aluminum Nitride (AlN) 15 1013 Silicon — — — — Table Thermomechanical Properties of Ceramic Insulators Material Specific gravity Thermal conductivity at 25oC (cal/secoCcm) Thermal coefficient of expansion 25300oC (106/oC) Tensile strength (Mpa) MOR Transv strength (Mpa) Compress strength (Mpa) Thernal shock resistance Porcelain (R2OAl2O3SiO2) 48 83 352 Fair Zircon (ZrO2SiO2) 96 172 524 Good Steatite (MgOSiO2) 100 125 650 Moderate Forsterite (2MgOSiO2) 10 76 140 550 Poor Cordierite (2MgO2Al2O35SiO2) 65 105 400 Excellent Alumina (%) 260 445 3400 Good Spinel (MgOAl2O3) 95 103 1710 Fair Mullite (3Al2O32SiO2) 90 150 1200 Fair Magnesia (MgO) 1013 90 138 950 Fair Beryllia (BeO9699%) 79 120 248 1600 Good Zirconia (ZrO2) 148 186 940 Poor Table Thermomechanical Properties of Ceramic Insulators Material Specific gravity Thermal conductivity at 25oC (cal/secoCcm) Thermal coefficient of expansion 25300oC (106/oC) Tensile strength (Mpa) MOR Transv strength (Mpa) Compress strength (Mpa) Thernal shock resistance Thoria (ThO2) 115 131 1524 Poor Hafnia (HfO2) 90 110 1386 Poor Ceria (CeO2) 88 110 1386 Poor Spodumene (Li2OAl2O3SiO2) 30 55 900 Good Boron nitride (BN) 25 52 250 Good Silicon nitride (Si3N4) 410 610 2022 Excellent Pyroceram 64 248 — Good Glassbonded mica 69 117 214 Fair Mica 1827 221 Glass (Na2OCaOSiO2) 34 120 697 Fair Quartz (SiO2) 55 — 1130 Excellent Aluminum Nitride (AlN) 441 — — Slicon carbide (SiC) 85 490 1380 Materials Systems for Ceramic Insulators ? Glasses ? Porcelains ? Steatite ( 滑石 ,), Forstrite( 鎂橄欖石 , ), Cordierite(堇青石 , 2MgO. ), Spinel( 尖晶石 , MgO. Al2O3), Mullite(莫來石 , ), … ? Single oxide and nitrides ceramics ? Alumina(Al2O3), Magnesia (MgO), Boron nitride (BN), Aluminum nitride (AlN), Silicon nitride (Si3N4) Property Criteria for Good Ceramic Insulators Dielectric constant: not greater than 30。 Electric resistivity: not less than 1012 Wcm。 Dielectric loss (dissipation factor): not larger than 。 Dielectric strength: not less than Dielectric loss factor: not larger than Property Target for Ceramic Substrates Low dielectric constant: e7 Low dielectric loss: tand4x104 High resistivity: ?~ High thermal conductivity。 Coefficient of thermal expansion close to that of Si. 作業(yè) 就下列問題之一進(jìn)行專題調(diào)研、在獨(dú)自撰寫小論文的基礎(chǔ)上，自愿組合 成小組 (1011人 ) 、共同準(zhǔn)備 PP T文件，并推舉代表演講 (15分鐘 )。 * 1) 絕緣陶瓷的材料體系 2) 陶瓷基板的研究現(xiàn)狀與發(fā)展趨勢 *第 2周準(zhǔn)備論文與講稿、 9/21演講
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