ZTA1878 Zirconia Toughened Alumina (ZTA) Ceramic Seal Rings

Catalog No. ZTA187
Appearance White smooth surface
Purity 99.9%
Shaple Seal Rings
Component Alumina, Zirconia

Stanford Advanced Materials is a global supplier of Zirconia Toughened Alumina Ceramic parts with competitive price and excellent service. All sizes of ZTA ceramic Sheet/Plate are finished with fine grinding, regular appearance, and high dimensional accuracy. Other customized shapes of ZTA ceramic are on request.

Related products: Zirconia, ZTA Nano Powder, ZTA Rod, ZTA Sheet/Plate, ZTA Tube

Description of ZTA Seal Rings

Zirconia Toughened Alumina Ceramics (referred to as composite ceramics, ZTA) has the characteristics of whiteness, corrosion resistance, and good chemical stability. Alumina has a high hardness and the toughness of zirconia is good. The two materials form an excellent composite of high strength and high toughness, and the application is more widely used. ZTA ceramic has higher flexural strength and fracture toughness at normal temperature, so zirconia toughened ceramics have excellent wear resistance. The specific ratio of the two materials can be adjusted according to the actual use requirements of the user. The performance of zirconia toughened alumina ceramics is better than that of 99 alumina ceramics, and the price is much lower than that of zirconia ceramics; many alumina ceramics are not suitable for the occasion, which shows better cost performance than zirconia ceramics. 

 zirconia ring

Specification of ZTA Seal Rings

 

Condition

Unit

ZTA Substrate

ZTA

Material

-

-

Al2O3/ZrO2

Color

-

-

White

Bulk Density

-

g/㎤

4

Surface Roughness Ra

-

µm

0.2

Reflectivity

0.3-0.4mmt

%

80

0.8-1.0mmt

90

Mechanical

Bending Strength

3-point method

MPa

700

Modulus of Elasticity

-

GPa

310

Vickers Hardness

-

GPa

15

Fracture Toughness

IF method

MPa・m1/2

3.5

Thermal

Coefficient of Thermal Expansion

40-400°C

10-6/K

7.1

40-800°C

8

Thermal Conductivity

25°C

W/(m・K)

27

300°C

16

Specific Heat

25°C

J/(㎏・K)

720

Electrical

Dielectric Constant

1MHz

-

10.2

Dielectric Loss Factor

1MHz

10-3

0.2

Volume Resistivity

25°C

Ω・㎝

>1014

Breakdown Strength

DC

㎸/㎜

>15

 

Performance of Al2O3, ZTA, and YTZ

Item

Unit

Alumina(AL2O3)

Zirconia(ZrO2)

AL2O3≥95

AL2O3≥99

AL2O3≥99.5

AL2O3≥99.8

ZTA

YTZ

Bulk Density

g/cm3

3.7

3.80~3.85

3.85

3.9

3.8~4.6

6

Hardness

HRA≥

86

88

88

88

86~88

88~90

Bending Strength

Mpa≥

300

350

400

400

172~450

900

Maximum Service Temperature

1500

1500

1500

1500

1400~1500

1500

Linear Expansion Coefficient

×10-6/℃

7.5

8.2

8.2

8.2

 

 

Dielectric Constant

εr(20℃,1MHz)

9

9.2

9.2

9.2

 

 

Dielectric Loss

tanδ×10-4,1MHz

3

2

2

2

 

 

Volume Resistivity

Ω·cm(20℃)

1013

1014

1014

1014

1013

1014

Breakdown Strength

KV/mm, DC≥

20

20

20

20

 

 

Acid Resistance

mg/cm2≤

0.7

0.7

0.7

0.7

 

 

Alkali Resistance

mg/cm2≤

0.2

0.1

0.1

0.1

 

 

Wear Resistance

g/cm2≤

0.2

0.1

0.1

0.1

 

 

The Compressive Strength

Mpa≥

2500

2500

2500

2800

2300~2900

2500

Flexural Strength

Mpa≥

200

350

350

350

 

 

Modulus of Elasticity

Gpa

300

350

350

350

 

 

Poisson's Ratio

 

0.2

0.22

0.22

0.22

 

 

Coefficient of Thermal Conductivity

W/m·K(20℃)

20

25

25

25

 

 

 

Applications of ZTA Seal Rings

* Mechanical, electronic, petroleum, chemical, aerospace, and textile industries.
* Standoffs
* Insulators
* Probe bodies
* Bushing
* Valve seals
* Analytical instrument columns

 

Packaging of ZTA Seal Rings

Our ZTA Seal Rings are clearly tagged and labeled externally to ensure efficient identification and quality control. The products are separated by bubble bag for shockproof purposes and finally packed in wooden or carton boxes. Great care is taken to avoid any damage which might be caused during storage or transportation.

packing-disc

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