technical ceramic solutions

What Is The Outstanding Characteristics for ZTA?

ZTA (Zirconia Toughened Alumina) is a composite material made from alumina and zirconia. It combines the outstanding characteristics of both materials.

Compared to conventional alumina, ZTA possesses superior hardness, higher flexural strength, and similar density. Compared to conventional zirconia, it possesses a lower coefficient of linear thermal expansion and higher thermal conductivity.

By leveraging these features, ZTA has been widely adopted in milling parts and wear-resistant parts that require cooling.

 ZTA (Zirconia Toughened Alumina)

ZTA (Zirconia Toughened Alumina)


  • High Stiffness and Outstanding Wear Resistance
  • Stiffer than alumina with outstanding wear resistance equivalent to zirconia.
  • High Thermal Conductivity and Low Thermal Expansion
  • Suppresses thermal deformation through thermal conductivity and low thermal expansion equivalent to alumina. Suitable for components requiring a cooling Mechanism.
  • High Strength and Specific Rigidity
  • Approximately twice as strong as alumina and contributes to low-weight design through high specific rigidity.


Below is the material properties for ZTA:



ZTA ceramic

Zirconia Content % 20%

Volume density

g /cm3

Water Absorption % 0
Crystal Size(Grain Size) μm 5-6
Vickers Hardness, HV1.0 Gpa ≥15
Flexural Strength Mpa ≥500
Coefficient of linear expansion 20-500℃ 1×10-6mm/℃ 6.5~7.5
20-800℃ 6.5~8.0
Thermal conductivity W/m·K( 20℃) ≥20.9
Specific Heat Capacity KJ/(kg*K) ≥0.8
Dielectric Strength KV/mm ≥9
Volume resistivity Ω·cm 20℃ ≥1014
Ω·cm 300℃ ≥1011
Ω·cm 500℃ ≥109
Dielectric Constant 1MHz 9-10
Tangent Of Dielectric Loss 1MHz ≤5×10-4
Surface Roughness μm 0.1-0.4 after the machine