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Improvement and Optimization of Material Performance

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.

Features

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

Specifications

Wear Resistance Test (Wet Grinding)

 
Wear Resistance Test (Wet Grinding)

Slurry Wear Resistance Test

Slurry Wear Resistance Test

Test Conditions

  • (1) Rotational Speed :
    1,750 rpm
  • (2) Test Duration :
    10 hours
  • (3) Test Material :
    Alumina Beads Φ1mm
  • (4) Loading Amount :
    Alumina Beads / Water
    2kg/4kg (11.4 vol.%)

 

  • (5) Samples :
    (5) Samples

Comparison of Wear Resistance and Thermal Conductivity

 
Comparison of Wear Resistance and Thermal Conductivity

Material Data Comparison

Material
Material Code
ZTA Alumina Zirconia Stainless Steel
AZ201O
(AZ201)
AZ205O
(AZ205)
AO479M
(A479M)
AO484O
(A484)
ZO201N
(Z201N)
SUS304
Alumina Content - - 99.5 92 - -
Color - White White Ivory White Ivory -
Density g/cm3 4.0 4.3 3.9 3.6 6.0 7.9
Mechanical Characteristics Vickers Hardness HV9.807N GPa 17.0 16.0 15.7 12.3 12.3 -
Flexural Strength (3-point Bending) MPa 700 700 370 370 1,000 -
Young’s Modulus GPa 380 335 370 280 200 193
Poisson’s Ratio - 0.24 0.25 0.23 0.23 0.31 0.29
Thermal Characteristics Coefficient of Linear Thermal Expansion 40~400℃ x10-6/℃ 7.2 7.7 7.2 6.8 10.5 10.9
40~800℃ 8.1 8.7 8.0 7.7 11.0 -
Thermal Conductivity 20℃ W/ (m・K) 30 17 32 17 3 16.7
Specific Heat Capacity J/ (g・K) 0.77 0.72 0.78 0.78 0.46 0.50

Example of Size for Manufactured Products

 
Disc Shape

Disc Shape

Cylindrical Shape

Cylindrical Shape

Values are based on typical material properties and
may vary according to product configuration and manufacturing process.