Ceramics

Zirconia Toughened Alumina Substrates

Zirconia Toughened Alumina Substrates

Features


Zirconia Toughened Alumina Substrates
  • Well controlled surface roughness with homogeneous and fine microstructure

  • 50% higher bending strength than Alumina or AlN substrates.

  • 20% higher thermal conductivity than alumina substrates.

  • The optical reflectivity is higher than alumina substrates. The substrate with higher reflectivity is also available.

  • Higher electrical insulation and smaller dielectric constant than alumina substrates.

Applications


Heat dissipation substrate for automotive, sustainable energy and LED package application

Characteristic Values


Condition Unit ZTA Substrate
ZTA HRZ
Material - - Al2O3/ZrO2 Al2O3/ZrO2
Color - - White White
Bulk density - g/㎤ 4.00 3.85
Surface roughness Ra - µm 0.2 0.2
Reflectivity 0.3-0.4mmt % 80 87
0.8-1.0mmt 90 97
Mechanical Bending strength 3-point method MPa 700 550
Modulus of elasticity - GPa 310 -
Vickers hardness - GPa 15 14
Fracture toughness IF method MPa・m1/2 3.5 -
Thermal Coefficient of thermal expansion 40-400°C 10-6/K 7.1 7.1
40-800°C 8.0 8.0
Thermal conductivity 25°C W/(m・K) 27 23
300°C 16 -
Specific heat 25°C J/(㎏・K) 720 720
Electrical Dielectric constant 1MHz - 10.2 -
Dielectric loss factor 1MHz 10-3 0.2 -
Volume resistivity 25°C Ω・㎝ >1014 >1014
Breakdown strength DC ㎸/㎜ >15 >15

General Dimentional Tolerances


Item Unit ZTA Substrate
ZTA HRZ
Dimension inch(max) 5.5"×7.5" 5.7"×7.8"
Tolerance ±1%
NLT:±0.1㎜
±1.5%
NLT:±0.1㎜
Thickness 0.25~1.0 0.25~1.0
Tolerance ±10%
NLT:±0.04㎜
±10%
NLT:±0.04㎜
Through hole Φ0.2~ Φ0.2~
Tolerance ±0.6%
NLT:±0.05㎜
±0.6%
NLT:±0.05㎜
Warpage 0.005/㎜ 0.005/㎜
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