Ceramics

Zirconia Toughened Alumina | Al<sub>2</sub>O<sub>3</sub>/ZrO<sub>2</sub>

Zirconia Toughened Alumina | Al2O3/ZrO2

Zirconia Toughened Alumina has improved bending strength and higher reflectivity than alumina and AlN. These qualities combined with good heat dissipation means that they are ideal for LED package and power module for automotive and sustainable energy technologies.

Material Characteristics for Alumina Substrates (Al2O3), Zirconia Toughened Alumina Substrates ( Al2O3/ZrO2), Aluminium Nitride Substrates (AlN), and Silicon Nitride (Si3N4)


Condition Unit Al2O3 Al2O3/ZrO2 AlN Si3N4
AS970 HA-96-2 HBS HRA HA-996 ZTA HRZ AN-170 SN-90
Material - - 96.5% 96% 96.5% 96% 99.6% Al2O3/ZrO2 Al2O3/ZrO2 AlN Si3N4
Color - - White White White White White White White Gray Gray
Bulk density - g/㎤ 3.74 3.75 3.75 3.60 3.90 4.00 3.85 3.30 3.22
Surface roughness Ra - µm 0.4 0.4 0.3 0.3 0.1 0.2 0.2 0.2 0.4
Reflectivity 0.3-0.4mmt % 70 70 70 85 75 80 87 35 -
0.8-1.0mmt 80 80 80 95 85 90 97 25 -
Mechanical Bending strength 3-point method MPa 450 400 500 370 470 700 550 450 800
Modulus of elasticity - GPa 330 330 330 - 330 310 - 320 310
Vickers hardness - GPa 14 14 14 - 16 15 14 11 15
Fracture toughness IF method MPa・m1/2 3.0 3.0 - - - 3.5 - 3.0 6.5
Thermal Coefficient of thermal expansion 40-400°C 10-6/K 6.7 6.7 6.7 6.7 6.8 7.1 7.1 4.6 2.6
40-800°C 7.8 7.8 7.8 7.8 7.9 8.0 8.0 5.2 3.1
Thermal conductivity 25°C W/(m・K) 24 24 24 20 29 27 23 180 85
300°C 12 12 12 - 13 16 - 120 -
Specific heat 25°C J/(㎏・K) 750 750 750 750 780 720 720 720 680
Electrical Dielectric constant 1MHz - 9.8 9.8 9.8 - 9.9 10.2 - 8.5 7.8
Dielectric loss factor 1MHz 10-3 0.2 0.2 0.2 - 0.05 0.2 - 0.3 0.4
Volume resistivity 25°C Ω・㎝ >1014 >1014 >1014 >1014 >1014 >1014 >1014 >1014 >1014
Breakdown strength DC ㎸/㎜ >15 >15 >15 >15 >15 >15 >15 >15 >15

Characteristic Values

  • Characteristic Values
  • Characteristic Values

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