Description of ZTA Seal Rings
Zirconia Toughened Alumina Ceramics (ZTA composite ceramics) possess notable characteristics such as whiteness, corrosion resistance, and excellent chemical stability. Alumina provides high hardness, while zirconia contributes to good toughness. The combination of these materials forms a superior composite with high strength and toughness, enabling a wide range of applications.
ZTA ceramics exhibit higher flexural strength and fracture toughness at normal temperatures, resulting in outstanding wear resistance. The ratio of alumina to zirconia can be adjusted to meet specific user requirements. Zirconia toughened alumina ceramics outperform 99% alumina ceramics in terms of performance while being more cost-effective compared to pure zirconia ceramics.
This makes ZTA ceramics an excellent choice when alumina ceramics are not suitable for a given application, offering improved cost performance and maintaining desirable mechanical properties.
Specification of ZTA Seal Rings
| |
Condition
|
Unit
|
ZTA Substrate
|
|
ZTA
|
|
Material
|
-
|
-
|
Al2O3/ZrO2
|
|
Color
|
-
|
-
|
White
|
|
Bulk Density
|
-
|
g/cm3
|
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/(kg･K)
|
720
|
|
Electrical
|
Dielectric Constant
|
1MHz
|
-
|
10.2
|
|
Dielectric Loss Factor
|
1MHz
|
10-3
|
0.2
|
|
Volume Resistivity
|
25°C
|
Ω･cm
|
>1014
|
|
Breakdown Strength
|
DC
|
kV/mm
|
>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
1. Pumps and Valves: ZTA ceramic seal rings are used in pumps and valves, particularly in chemical and petrochemical industries, where they provide excellent sealing performance and resistance to corrosion and wear.
2. Mechanical Seals: Employed in mechanical seals for rotating equipment, such as compressors, mixers, and agitators. Their durability and ability to maintain a tight seal under extreme conditions make them ideal for preventing leaks in these applications.
3. Aerospace and Defense: Used in aerospace and defense applications where reliability and performance under high-stress conditions are critical. ZTA seal rings provide excellent resistance to thermal shock and wear, ensuring long-lasting performance.
4. Oil and Gas Industry: Applied in the oil and gas industry for sealing components in drilling equipment, pipelines, and processing plants. Their resistance to high pressures, temperatures, and corrosive environments makes them suitable for these demanding applications.
5. Water Treatment and Desalination: Utilized in water treatment and desalination plants for sealing pumps and valves that handle abrasive and corrosive media, ensuring long service life and reduced maintenance.
6. Automotive Industry: Used in automotive applications, particularly in engines and transmission systems, where they help to improve efficiency and reduce wear and tear on moving parts.
7. Pharmaceutical and Food Processing: Applied in pharmaceutical and food processing equipment where chemical inertness, hygiene, and resistance to wear are essential for maintaining product purity and equipment longevity.
8. Power Generation: Employed in power generation plants, including thermal, hydroelectric, and nuclear power plants, for sealing components exposed to high temperatures, pressures, and corrosive environments.
9. Mining and Mineral Processing: Used in mining and mineral processing equipment for sealing applications that require high wear resistance and the ability to withstand harsh, abrasive conditions.
10. Industrial Machinery: Incorporated in various industrial machinery and equipment, such as mixers, crushers, and conveyors, where their wear resistance and durability help to maintain optimal performance and reduce downtime.
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 bags 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.
Frequently Asked Questions (FAQ)
- Can ZTA ceramic seal rings be customized for specific applications?
Yes, ZTA ceramic seal rings can be customized in terms of composition, microstructure, dimensions, tolerances, surface finish, and other properties to meet the specific requirements of different sealing applications.
- Are ZTA ceramic seal rings suitable for high-pressure and high-temperature applications?
Yes, ZTA ceramic seal rings exhibit excellent mechanical and thermal properties, making them suitable for use in high-pressure and high-temperature environments where conventional sealing materials may fail.
- How do you handle and install ZTA ceramic seal rings?
ZTA ceramic seal rings should be handled with care to prevent damage, particularly during transportation, storage, and installation. Proper cleaning and inspection procedures should be followed to ensure optimal sealing performance.
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