As the coil rack of the sensor coil, the silicon nitride coil rack mainly applies the ultra-high hardness performance of silicon nitride ceramics and the nonmagnetic insulation of Silicon Nitride (Si3N4) Ceramic. As the sensor coil rack, it must be insulated and nonmagnetic in order to accurately transmit the collected data; At the same time, as a sensor for depth exploration, the underground environment is generally complex, and only the support with high hardness can protect the sensor from damage. In addition, the silicon nitride support has certain protective effects on the sensor coil due to its anti-corrosion, high and low temperature resistance, and low coefficient of thermal expansion.
Applications:
Induction ceramic coil of induction instrument in practical oil well logging instruments
In the field of medical imaging equipment, such as magnetic resonance imaging (MRI) systems, gradient coil stents are used as core components
Silicon Nitride Ceramic Material Properties
| Properties | Unit | Value |
| Density | g/cm3 | 3.2±0.05 |
| Relative density | % | >99.5 |
| Elastic Modulus | GPa | 300~320 |
| Crushing Load Ratio (25℃) | % | ≥40 |
| Hardness | (HRA) | 91 |
| Fracture Toughness | MPa·m1/2 | 6.0~7.0 |
| Flexural Strength | MPa | 600~700 |
| Poisson's Ratio | - | 0.25 |
| Coefficient of Thermal Expansion | 10-6 /K | 2.3~3.2 |
| Weibo Modulus | Gpa | 10~12 |
| Thermal Conductivity | - | 15~20 |
| Resistivity | W/(m·K) | 1018 |
| Acid and Alkali Corrosion Resistance | - | Excellent |
| Dimensional Stability | - | Excellent |
| Magnetism | - | None |
| Oxide Content | % | 8 |
Benefits：
High strength over a large temperature range
High fracture toughness
Good flexural strength
Mechanical fatigue and creep resistant
Lightweight – Low density
High hardness and wear resistance, both impingement and frictional modes
Superior thermal shock resistance
Low thermal expansion
Electrical insulator
Good oxidation resistance
Good chemical corrosion resistance
Wear-resistant
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Frequently Asked Questions
Why Are Silicon Nitride Coil Cores Essential for Downhole Logging and MRI? How Do They Prevent Signal Interference?
In deep petroleum logging and MRI gradient systems, metallic or magnetic coil supports distort high-frequency electromagnetic fields and compromise data fidelity. INNOVACERA’s silicon nitride (Si3N4) coil cores are strictly non-magnetic and provide extreme electrical resistivity (>10^18 Ω·cm). Combined with a high flexural strength of 600–700 MPa, HRA 91 hardness, and a low thermal expansion coefficient (2.3–3.2 x 10^-6 /K), they shield delicate induction sensor coils from downhole crushing loads and thermal expansion drift without causing signal attenuation.
Need Precision-Machined Coil Racks for Harsh Exploration Environments? How to Source Custom Si3N4 Cores from a Qualified Manufacturer?
INNOVACERA is an advanced technical ceramic manufacturer producing custom silicon nitride coil racks and winding bobbins engineered to demanding dimensional tolerances. Customers can tailor wire-guide threading grooves, internal bores, wall thicknesses, and mounting flanges to withstand extreme underground pressures and corrosive fluids in geological exploration sondes and medical imaging platforms. Simply send us your technical drawings and winding layout to receive engineering verification.
