Product Description
In the ever-evolving world of technology, precision and reliability are paramount. This is especially true in industries such as MRI diagnostics and semiconductor manufacturing, where even the slightest interference can lead to significant setbacks. Enter non-magnetic silicon nitride balls—a solution that is rapidly gaining traction for its unique properties and unmatched performance.
Silicon nitride (Si3N4) is a ceramic material known for its impressive mechanical properties. It boasts high strength, excellent wear and corrosion resistance, and a lightweight structure, making it ideal for various industrial applications. One of its standout features is its non-magnetic nature, which is crucial in environments where magnetic interference is a concern.
- Non-Magnetic Properties: Unlike steel balls, silicon nitride balls do not disturb magnetic fields, making them ideal for MRI equipment and semiconductor tools.
- High Strength and Durability: Silicon nitride's robust structure ensures longevity and reliability, reducing maintenance costs.
- Electrical Insulation: These balls prevent electrolytic corrosion, a common issue in electric motor applications.
- Low Thermal Expansion: This property allows for stable performance even in high-temperature environments.
Magnetic Resonance Imaging (MRI) is a critical tool in the medical diagnostic field. The precision of MRI machines is heavily reliant on the absence of magnetic interference. Silicon nitride balls, being non-magnetic, are perfect for components within MRI machines, ensuring accurate imaging without distortion.
The semiconductor industry demands high-speed, precision manufacturing processes. Silicon nitride balls are used in bearings within semiconductor tools, where their lightweight and high-speed capabilities are essential. They reduce centrifugal force during bearing rotation, enabling faster operating speeds and enhancing productivity.
- Reduced Centrifugal Force: The density of silicon nitride is less than half that of steel, which minimizes the centrifugal force during rotation. This feature is particularly beneficial in high-speed applications.
- Enhanced Bearing Life: Silicon nitride balls have been shown to increase bearing life by 50% or more compared to steel balls, thanks to their wear resistance and durability.
- Cost Efficiency: By reducing the frequency of replacements and maintenance, silicon nitride balls lower the total lifecycle cost of equipment.
| Property |
Silicon Nitride (Si3N4) |
Steel (440C) |
Zirconia (ZrO2) |
Alumina (Al2O3) |
| Density (g/cm³) |
3.2 |
7.8 |
6.0 |
3.9 |
| Hardness (HV) |
1,400–1,600 |
700–900 |
1,200–1,300 |
1,500–1,800 |
| Fracture Toughness (MPa·m½) |
6–7 |
15–20 |
7–10 |
3–4 |
| Compressive Strength (GPa) |
2.5–3.5 |
2.0–2.5 |
2.0–2.3 |
2.0–3.0 |
●Description:
Silicon Nitride Ceramic Ball is the most ideal bearing ball for bearing applications, due to the excellent properties of silicon nitride ceramics, it has many irreplaceable advantages comparing to traditional steel materials, such as: high mechanical strength, low wear loss, good self-lubrication, low density, high corrosion resistance, good electrical insulation etc.
Therefore, Silicon Nitride Balls are mostly used for some harsh working conditions: high speed/super speed bearings, high precision bearings, bearings in vacuum, high/low temperature bearings.
Moreover, Silicon Nitride Ceramic Balls can also used as valve ball or measurement balls in chemical pumps/high temperature pumps/metdering pumps.
●Physical Properties:
|
Chemical Composition:
|
Si3N4≥95%
|
|
Bulk Density:
|
3.2±0.05g/cm3
|
|
Elastic Modulus:
|
350GPa
|
|
Hardness Vickers:
|
1870HV
|
|
Bending Strength:
|
780MPa
|
|
Fracture Toughness:
|
7.2MPa·m1/2
|
|
Thermal Expansion Coefficient:
|
3.2 10-6/K
|
|
Thermal Conductivity:
|
25W/(m·K)
|
● Ball Sizes/Grade :
|
Size (mm)
|
Φ0.8-180
|
|
Grade
|
Vdws
|
SPH
|
Vdwl
|
Ra
|
|
G3
|
0.05-0.08
|
≤0.08
|
<0.13
|
0.01
|
|
G5
|
0.08-0.13
|
≤0.13
|
<0.25
|
0.014
|
|
G10
|
0.15-0.25
|
≤0.25
|
<0.5
|
0.02
|
|
G16
|
0.2-0.4
|
≤0.4
|
<0.8
|
<0.025
|
|
G20
|
0.3-0.5
|
≤0.5
|
<1
|
<0.032
|
|
G100
|
0.4-0.7
|
0.4-0.7
|
<1.4
|
<0.0105
|
Factory equipment
Exhibition & Partner
Case
Ship to South Korea
Ship to Spain
FAQ
1. What sizes and tolerances are available?
-
Diameter range: 0.5mm to 50mm (custom sizes possible).
-
Sphericity: As low as 0.1µm (Grade 5 for ultra-precision bearings).
-
Surface finish: Ra < 0.02µm (mirror polish for low friction).
2. Are silicon nitride balls FDA-approved for medical use?
Yes! Si3N4 is biocompatible (ISO 6474-1) and used in spinal implants, dental devices, and joint replacements due to its antibacterial properties.
3. How do I choose the right Si3N4 balls for my application?
Consider:
-
Load & speed requirements (dynamic/static stress).
-
Temperature range (Si3N4 excels in high heat).
-
Chemical exposure (resistant to most acids/alkalis).
-
Electrical insulation needs (non-conductive).
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