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Zirconia Toughened Alumina Seal Rings(ZTA Seal Rings)

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Zirconia Toughened Alumina Ceramics (referred to as composite ceramics, ZTA) has the characteristics of corrosion resistance and chemical stability. Alumina has high hardness and the toughness of zirconia is good. The composite ceramics have the properties of both materials, it has higher flexural strength and fracture toughness at room temperature, and zirconia toughened ceramics have excellent wear resistance, high strength, and hardness. The main advantage of Zirconia Toughened Alumina (ZTA) is the additional strength and toughness over alumina with a lower cost than zirconia (YTZP, MSZ, CSZ). The combination of aluminum oxide and 10-20% zirconium oxide provides a much higher strength, toughness, hardness and wear resistance than alumina alone. The 20-30% increase in strength often provides the design criteria needed at a much lower cost than using zirconia. A process called transformation toughening is the phenomenon that increases the fracture toughness of ZTA. When placed under stress, the zirconia particles change their crystal structure from a tetragonal to a monoclinic structure, causing a volume expansion that compresses the surrounding crack in the alumina matrix. ZTA should be considered for any application where structural strength is needed that exceeds the standard alumina properties.

Zirconia Toughened Alumina (ZTA) Ceramic Seal Rings has the properties of corrosion resistance and good chemical stability, ATT can adjust the specific ratio of alumina and zirconia in Zirconia Toughened Alumina (ZTA) Ceramic Seal Rings according to the actual requirements of users.

Please contact us if you need customized services. We will contact you with the price and availability in 24 hours.

Product Information

Zirconia Toughened Alumina Ceramics (referred to as composite ceramics, ZTA) has the characteristics of corrosion resistance and chemical stability. Alumina has high hardness and the toughness of zirconia is good. The composite ceramics have the properties of both materials, it has higher flexural strength and fracture toughness at room temperature, and zirconia toughened ceramics have excellent wear resistance, high strength, and hardness. The main advantage of Zirconia Toughened Alumina (ZTA) is the additional strength and toughness over alumina with a lower cost than zirconia (YTZP, MSZ, CSZ). The combination of aluminum oxide and 10-20% zirconium oxide provides a much higher strength, toughness, hardness and wear resistance than alumina alone. The 20-30% increase in strength often provides the design criteria needed at a much lower cost than using zirconia. A process called transformation toughening is the phenomenon that increases the fracture toughness of ZTA. When placed under stress, the zirconia particles change their crystal structure from a tetragonal to a monoclinic structure, causing a volume expansion that compresses the surrounding crack in the alumina matrix. ZTA should be considered for any application where structural strength is needed that exceeds the standard alumina properties.

Zirconia Toughened Alumina (ZTA) Ceramic Seal Rings has the properties of corrosion resistance and good chemical stability, ATT can adjust the specific ratio of alumina and zirconia in Zirconia Toughened Alumina (ZTA) Ceramic Seal Rings according to the actual requirements of users.

Zirconia Toughened Alumina Seal Rings Specifications

Dimensions

Per your request or drawing

We can customized as required


Properties(Theoretical)


ConditionUnitZTA
MaterialAl2O3/ZrO2
ColorWhite
Densityg/cm34
Melting Point

2,072° C (3,762° F)
Boiling Point

2,977° C (5,391° F)
Surface Roughnessμm0.2
Reflectivity0.3-0.4mmt%80
0.8-1.0mmt%90
  MechanicalBending   strength3-point methodMPa700
Modulus of   ElasticityGPa310
Vickers   HardnessGpa15
Fracture   toughnessIF methodMPa∙m1/23.5
ThermalCoefficient of   thermal expansion40-400℃10–6/K7.1
80-400℃10–6/K8
Thermal   conductivity25℃W/(m∙K)27
300℃W/(m∙K)16
Specific heat25℃J/(Kg∙K)720
ElectricalDielectric   constant1mHZ10.2
Dielectric   loss factor1MHZTanx10-40.2
Volume   resistivity25℃Ω∙cm>1014
Breakdown   strengthDCkV/mm>15



PropertyASTM MethodUnitsZTA-15ZTA-19
GeneralCrystal Size (Average)Thin SectionMicrons63
Color----WhiteWhite
Gas Permeability--Atms-Cc/SecGas Tight <10-10Gas Tight <10-10
Surface Roughness--μm0.20.2
Water AbsorptionC 20-97%00
MechanicalDensityC 20-97G/Cc4.154.25
HardnessVickers 500gmGPa (Kg/Mm2)14.5 (1478)14.4 (1470)
Hardness--R45N8282
Bending strength(3-point method)
Mpa700710
Fracture ToughnessNotched BeamMPam1/266
Flexural Strength (MOR)F417-87MPa (Psi X 103586 (85)620 (90)
(3 Point) @ RT



Tensile Strength @ RT--MPa (Psi X 103)344 (50)350 (51)
Compressive Strength @ RT--MPa (Psi X 103)2758 (400)2758 (400)
Elastic ModulusC848GPa (Psi X 106)338 (49)338 (49)
Poisson's RatioC848--0.230.23
ThermalC.T.E. 25 - 100° CC 372-96X 10-6/C66
C.T.E. 25 - 300° CC 372-96X 10-6/C77
C.T.E. 25 - 600° CC 372-96X 10-6/C7.17.1
Thermal Conductivity @ RTC 408W/M K2424
Max Use Temp--Fahrenheit (°F)27302730

--Celsius (°C)15001500
ElectricalDielectric Strength (.125" Thick)D 149-97AV/Mil250250
Dielectric Constant @ 1 MHzD 150-98--12.512.5
Dielectric ConstantD 2520-95----12.4
@ GigahertzD 2520-95----9.4
Dielectric Loss @ 1 MHzD 150-98--0.00060.0006
Dielectric LossD 2520-95--0.00050.0005
@ GigahertzD 2520-95--9.49.4
Volume Resistivity, 25°CD 257Ohms-Cm> 1 X 1014> 1 X 1014
Volume Resistivity, 300°CD 1829Ohms-Cm1 X 10101 X 1010
Volume Resistivity, 500°CD 1829Ohms-Cm2 X 1092 X 109
Volume Resistivity, 700°CD 1829Ohms-Cm2 X 1084 X 108


Advantages

- Lower Cost Than Zirconia

- High Erosion Resistance

- Capable Of A Very Fine Surface Finish

- Higher Strength Than Alumina

- High Corrosion Resistance

- High Fracture Toughness


ZTA Machining

ZTA can be machined in green, biscuit, or fully dense states. While in the green or biscuit form, it can be machined relatively easily into complex geometries. However, the sintering process that is required to fully densify the material causes the zirconia body to shrink approximately 20%. This shrinkage means that it is impossible to hold very tight tolerances when machining zirconia pre-sintering. In order to achieve very tight tolerances, the fully sintered material must be machined/ground with diamond tools. In this manufacturing process, a very precise diamond coated tool/wheel is used to abrade away the material until the desired form is created. Due to the inherent toughness and hardness of the material, this can be a time consuming and costly process.


Applications of Zirconia Toughened Alumina Seal Rings

Where high strength and erosion-resistant material is needed, ZTA ceramics can become the first choice. Industrial components such as valve seals, sleeves, pump pistons, and spraying nozzles are perfectly suited for ZTA. 

Pump Piston Sleeves

Instrument

Sensor Bulbs

Valve Seals

Impellers

Insulators

Probe Bodies

Pump Components

Bushings

Fluid Delivery System Components

Analytical Instrument Columns

Standoffs


Packing of Zirconia Toughened Alumina Seal Rings

Standard Packing:

Sealed bags in carton boxes. Special package is available on request.

As a ceramic material, ZTA is quite fragile in a lot of cases. The ZTA Seal Rings are usually held in plastic bags by vacuum, and protected with heavy foam.

ATTs’ ZTA Seal Rings is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition.

Chemical Identifiers

Linear FormulaZrO-Al2O3
MDL NumberMFCD00003424
EC No.N/A
Beilstein/Reaxys No.N/A
Pubchem CID14769
IUPAC NameOxo(oxoalumanyloxy)   alumane
SMILESO=[Al]O[Al]=O
InchI IdentifierInChI=1S/2Al.3O
InchI KeyTWNQGVIAIRXVLR-UHFFFAOYSA-N


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