Description of the ZTA Disc
Zirconia Toughened Alumina Ceramics (ZTA composite ceramic) exhibits defined properties including a preset degree of whiteness, corrosion resistance and consistent chemical stability. Aluminium oxide contributes high hardness, while zirconium dioxide increases toughness. The combination of these materials forms a composite that delivers high strength and toughness, thereby supporting a broad range of applications.
ZTA ceramic shows increased flexural strength and fracture toughness at ambient temperatures, which results in measurable wear resistance. The ratio of aluminium oxide to zirconium dioxide can be adjusted to meet specific user requirements. Zirconium dioxide-prestressed aluminium oxide ceramic demonstrates enhanced performance compared to 99% aluminium oxide ceramic and is more cost-efficient than pure zirconium dioxide ceramic.
This makes ZTA ceramic an appropriate choice when alumina ceramic is unsuitable, as it maintains the desired mechanical properties while reducing costs.
Specifications of the ZTA Disc
|
-
|
Condition
|
Unit
|
ZTA Substrate
|
|
ZTA
|
|
Material
|
-
|
-
|
Al2O3/ZrO2
|
|
Colour
|
-
|
-
|
White
|
|
Bulk density
|
-
|
g/cm³
|
4
|
|
Surface roughness Ra
|
-
|
µm
|
0.2
|
|
Reflectance
|
0.3–0.4 mm
|
%
|
80
|
|
0.8–1.0 mm
|
90
|
|
Mechanical
|
Flexural strength
|
3-Point method
|
MPa
|
700
|
|
Elastic modulus
|
-
|
GPa
|
310
|
|
Vickers hardness
|
-
|
GPa
|
15
|
|
Fracture toughness
|
IF method
|
MPa·m1/2
|
3.5
|
|
Thermal
|
Thermal expansion coefficient
|
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)
|
Zirconium dioxide (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
|
|
Flexural strength
|
MPa≥
|
300
|
350
|
400
|
400
|
172–450
|
900
|
|
Maximum operating temperature
|
°C
|
1500
|
1500
|
1500
|
1500
|
1400–1500
|
1500
|
|
Linear thermal expansion coefficient
|
×10⁻⁶/°C
|
7.5
|
8.2
|
8.2
|
8.2
|
|
|
|
Dielectric constant
|
εr (20°C,1MHz)
|
9
|
9.2
|
9.2
|
9.2
|
|
|
|
Dielectric loss
|
tanδ×10⁻⁴, 1MHz
|
3
|
2
|
2
|
2
|
|
|
|
Volume resistivity
|
Ω·cm (20°C)
|
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
|
mg/cm²≤
|
0.2
|
0.1
|
0.1
|
0.1
|
|
|
|
Compressive strength
|
MPa≥
|
2500
|
2500
|
2500
|
2800
|
2300–2900
|
2500
|
|
Flexural strength
|
MPa≥
|
200
|
350
|
350
|
350
|
|
|
|
Elastic modulus
|
GPa
|
300
|
350
|
350
|
350
|
|
|
|
Poisson's ratio
|
|
0.2
|
0.22
|
0.22
|
0.22
|
|
|
|
Thermal conductivity coefficient
|
W/m-K (20°C)
|
20
|
25
|
25
|
25
|
|
|
Applications of the ZTA Disc
1. Cutting tools: ZTA ceramic discs are used in cutting tools and machining applications where precise hardness, wear resistance and toughness are required for processing hard materials.
2. Biomedical implants: Owing to their biocompatibility, ZTA ceramic discs are employed in medical implants such as dental implants, hip prostheses and other orthopaedic devices. They maintain the necessary wear resistance and mechanical strength.
3. Grinding tools: They are utilised in grinding and polishing instruments for finishing applications. Their hardness and durability enable precision grinding of metals, ceramics and other hard materials.
4. Mechanical seals and bearings: They are applied in mechanical seals and bearings in environments that require high wear resistance, chemical stability and low friction. Such components are used in pumps, compressors and industrial machinery.
5. Thermal and electrical insulators: They are employed as insulators in electrical and thermal applications given their high breakdown strength, thermal stability and ability to endure temperature cycles.
6. Wear parts: They are integrated in various industrial wear components such as valve seats, nozzles and wear plates, where prolonged exposure to harsh conditions necessitates high wear resistance and toughness.
7. Cutting blades and knives: They are implemented in cutting blades and knives, particularly in sectors that require precise and durable cutting edges, for example in food processing and textile manufacturing.
8. Sensor components: They are used in sensor components that operate in harsh conditions, thereby utilising their stability and resistance to environmental influences.
9. Defence and aerospace: They are integrated in the defence and aerospace industry for parts that require a combination of low weight, accurate strength and resistance to extreme temperatures and wear.
10. Chemical processing: They are employed in chemical processing equipment where resistance to corrosion, wear and high temperatures is critical for component longevity and reliability.
Packaging of the ZTA Disc
Our ZTA discs are clearly marked and labelled to ensure efficient identification and quality control. The products are individually separated in air-cushioned bags and subsequently packed in wooden crates or cartons. Care is taken to avoid any damage during storage or transport.
Frequently Asked Questions (FAQ)
- Can ZTA ceramic discs be modified for specific applications?
Yes, ZTA ceramic discs can be customised in terms of composition, microstructure, form, size and surface treatment to meet the specific requirements of various applications.
- How should ZTA ceramic discs be handled and maintained?
ZTA ceramic discs should be handled carefully to prevent damage, particularly during installation and operation. Regular inspection and maintenance may be required to ensure optimal function and longevity.
- Are ZTA ceramic discs suitable for high-temperature applications?
Yes, ZTA ceramic discs exhibit reliable thermal stability and can withstand high temperatures, making them appropriate for use in environments with elevated operating conditions.
Converters & Calculators
