Ceramic - Chemical Resistance Acids - concentrated Acids - dilute Alkalis Halogens Metals

Transcription

1 Ceramic - Chemical Resistance Acids - concentrated Acids - dilute Alkalis Halogens Metals Fair Good Poor-Fair - Good 62/SiO2 24/B2O3 14 Fair Good Poor-Fair /SiO2 28/B2O3 2 Good Good Good Good Good - Fair Poor - - Machineable Aluminium Nitride Poor Fair Fair - Good AlN Alumino-silicate Glass Fair Good Good - - SiO 2 57/Al 2 O3 36/CaO/MgO/ BaO Beryllia Poor Fair Fair Fair Good BeO 99.5 Boron Carbide - Hot-pressed Fair Good Fair Fair Fair Boron Nitride Fair Fair Fair Poor Good BN Leachable Ceramic Fair Fair Poor Fair Good SiO 2 50/ZrSiO 4 40/Al2O3 10 Magnesium Oxide Good MgO Potassium Aluminosilicate Fair Good Good - - Muscovite Mica Quartz - Fused Good Good Fair Good Fair SiO 2 Ruby Good Good Good Good Good /Cr2O3 /Si2O3 Sapphire Good Good Good Good Good 99.9 Silicon Carbide - Hotpressed Good Good Good-Poor Good-Poor Fair Silicon Carbide - Reaction Good Good Fair Fair Fair Silicon Nitride - Hot-pressed Fair Good Good-Poor Good Fair 1

2 Ceramic - Chemical Resistance Acids - concentrated Acids - dilute Alkalis Halogens Metals Silicon Nitride - Reaction Fair Good Fair Good Fair Silicon Nitride/Aluminium Good Good Fair - - Nitride/Aluminium Oxide Sialon Titanium Diboride Fair Good Fair Good Good TiB 2 Titanium Dioxide Fair Good Poor - Poor TiO % Vycor Good Good Fair Good Fair SiO 2 96 Zirconia - stabilised with Magnesia ZrO 2 /MgO Fair Good Good-Poor Fair Good-Fair 2

3 Dielectric constant Ceramic - Electrical Properties Dielectric strength kv mm -1 Volume resistivity Ohmcm > GHz /SiO2 24/B2O GHz /SiO2 28/B2O Machineable (BNP-2) Machineable x 10 Aluminium Nitride >10 AlN Beryllia BeO >10 Boron Carbide - Hot-pressed - - Boron Nitride BN Potassium Aluminosilicate Muscovite Mica Quartz - Fused SiO 2 Ruby /Cr2O3 /Si2O3 Sapphire > Silicon Carbide - Hotpressed Silicon Carbide - Reaction Silicon Nitride - Hot-pressed Silicon Nitride - Reaction 10-3

4 Dielectric constant Ceramic - Electrical Properties Dielectric strength kv mm -1 Volume resistivity Ohmcm Silicon Nitride/Aluminium Nitride/Aluminium Oxide Sialon Titanium Diboride - - TiB 2 Titanium Dioxide TiO % Tungsten Carbide/Cobalt WC 94/Co Vycor SiO

5 Compressive strength MPa Fracture toughness MPam(0.5) Ceramic - Mechanical Properties Hardness - Knoop kgf mm -2 Hardness - Vickers Poisson s ratio Shear strength kgf mm -2 MPa Tensile modulus GPa /SiO2 24/B2O /SiO2 28/B2O < (parallel) Machineable (BNP-2) Machineable Aluminium Nitride AlN Beryllia BeO 99.5 Boron Carbide - Hot-pressed Boron Carbide Boron Nitride BN Potassium Aluminosilicate Muscovite Mica Mohs Quartz - Fused SiO 2 Ruby /Cr2O3 /Si2O3 Sapphire Silicon Carbide - Hotpressed Silicon Carbide - Reaction Silicon Carbide

6 Compressive strength MPa Fracture toughness MPam(0.5) Ceramic - Mechanical Properties Hardness - Knoop kgf mm -2 Hardness - Vickers Poisson s ratio Shear strength kgf mm -2 MPa Tensile modulus GPa Silicon Nitride - Gas Pressure Sintered Si N Silicon Nitride - Hot-pressed Silicon Nitride - Reaction Silicon Nitride/Aluminium > Nitride/Aluminium Oxide Sialon Titanium Diboride TiB 2 Titanium Dioxide TiO % Tungsten Carbide/Cobalt WC 94/Co 6 Vycor SiO 2 96 Zirconia - stabilised with Magnesia ZrO 2 /MgO Zirconia - stabilised with Yttria ZrO 2 /Y 2 O

7 Apparent porosity % Ceramic - Physical Properties Density Refractive index Useful optical transmission g cm -3 range Water absorption - saturation % /SiO2 24/B2O /SiO2 28/B2O3 2 /Silica /SiO Machineable (BNP-2) Machineable Aluminium Nitride nm 0 AlN Alumino-silicate Glass SiO 2 57/Al 2 O3 36/CaO/MgO/ BaO Beryllia BeO 99.5 Boron Carbide - Hot-pressed < Boron Carbide Boron Nitride BN Leachable Ceramic SiO 2 50/ZrSiO 4 40/Al2O3 10 Magnesium Oxide <1% MgO Potassium Aluminosilicate nm Very Low Muscovite Mica Quartz - Fused nm 0 SiO 2 Ruby /Cr2O3 /Si2O nm 0 7

8 Apparent porosity % Ceramic - Physical Properties Density Refractive index Useful optical transmission g cm -3 range Water absorption - saturation % Sapphire nm Silicon Carbide - Hotpressed Silicon Carbide - Reaction Silicon carbide/silica/ /Magnesia 90/SiO 2 7/Al 2 O3 1.5/MgO Silicon Carbide Silicon Nitride - Gas Pressure Sintered Si 3 N Silicon Nitride - Hot-pressed Silicon Nitride - Reaction Silicon Nitride/Aluminium Nitride/Aluminium Oxide Sialon Silicon Nitride Superwool Silica/Calcia/Magnesia Titanium Diboride TiB 2 Titanium Dioxide TiO % Tungsten Carbide/Cobalt WC 94/Co 6 Vycor nm 0 SiO 2 96 Yttrium Oxide Y 2 O 3 Zirconia - stabilised with Magnesia ZrO 2 /MgO

9 Apparent porosity % Ceramic - Physical Properties Density Refractive index Useful optical transmission g cm -3 range Water absorption - saturation % Zirconia - stabilised with Yttria ZrO 2 /Y 2 O3 Zirconia - unstabilised ZrO

10 Ceramic - Thermal Properties Coefficient of thermal expansion x10-6 K -1 Melting point C Specific heat J K -1 kg -1 Sublimation point C Thermal conductivity W m -1 K -1 Upper continuous use temperature C /SiO2 24/B2O /SiO2 28/B2O3 2 /Silica /SiO parallel (oxidising) Machineable (BNP-2) Machineable Aluminium Nitride AlN Alumino-silicate Glass SiO 2 57/Al 2 O3 36/CaO/MgO/ BaO Beryllia BeO 99.5 Boron Carbide - Hot-pressed Boron Carbide Boron Nitride BN Leachable Ceramic SiO 2 50/ZrSiO 4 40/Al2O3 10 Magnesium Oxide MgO Potassium Aluminosilicate Muscovite Mica Quartz - Fused SiO 2 Ruby /Cr2O3 /Si2O

11 Ceramic - Thermal Properties Coefficient of thermal expansion x10-6 K -1 Melting point C Specific heat J K -1 kg -1 Sublimation point C Thermal conductivity W m -1 K -1 Upper continuous use temperature C Sapphire Silicon Carbide - Hotpressed Silicon Carbide - Reaction Silicon Carbide Silicon Nitride - Gas RT Pressure Sintered Si 3 N Silicon Nitride - Hot-pressed Silicon Nitride - Reaction Silicon Nitride/Aluminium Nitride/Aluminium Oxide Sialon Silicon Nitride Titanium Diboride TiB 2 Titanium Dioxide TiO % Tungsten Carbide/Cobalt WC 94/Co 6 Vycor SiO 2 96 Yttrium Oxide Y 2 O 3 Zirconia - stabilised with Magnesia ZrO 2 /MgO Zirconia - stabilised with Yttria ZrO 2 /Y 2 O3 Zirconia - unstabilised ZrO

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