Precision Ceramic Insulators
Ceramic insulators are custom-manufactured components that provide electrical isolation, thermal barriers, or mechanical support with electrical separation in demanding environments. Unlike generic insulation materials, ceramic insulators are precision-machined to customer drawings with specific geometries optimized for creepage distance, conductor clearance, and mounting requirements. Engineering factors include geometry, material selection, dimensional tolerance, surface finish, and operating temperature. Korecera manufactures custom ceramic insulators from customer drawings in Alumina, Macor, and Zirconia.
Insulator Types & Functions
High-Voltage Insulators
Function: Electrical isolation between conductive elements at elevated potentials
Geometry: Custom profiles with creepage-enhancing surfaces
Thermal Insulators
Function: Thermal barrier while maintaining electrical isolation
Geometry: Thin-wall or shaped profiles for heat flow control
Feedthrough Insulators
Function: Seal and insulate conductors passing through chamber walls
Geometry: Precision bore for conductor, OD for housing seal
Standoff Insulators
Function: Mechanical support with electrical isolation
Geometry: Cylindrical or shaped with mounting features
Available Ceramic Materials
| Material | Relevant Characteristic | When Considered | Manufacturing Consideration |
|---|---|---|---|
| Alumina (Al₂O₃) | High dielectric strength, good mechanical strength | General electrical isolation, high-voltage applications | CNC grinding, lapping, chamfering |
| Macor (Machinable Glass Ceramic) | Machinable to complex 3D shapes, good dielectric | Complex geometries, custom profiles, prototypes | CNC machining, minimal post-processing |
| Zirconia (ZrO₂) | High fracture toughness, good dielectric | Applications requiring mechanical shock resistance | OD/ID grinding, fine polishing |
Critical Features
| Critical Feature | Engineering Significance | Manufacturing Consideration | Inspection Method |
|---|---|---|---|
| Geometry / Profile | Defines creepage distance, mounting interface, and conductor clearance | CNC grinding, lapping, chamfering | CMM, optical comparator |
| Material Purity | Affects dielectric properties and leakage current | Material certification, controlled sourcing | Material test report |
| Surface Finish | Influences surface leakage and contamination retention | Lapping, polishing as required | Surface roughness tester |
| Dimensional Tolerance | Ensures proper fit in assembly and clearance for conductors | Precision grinding | CMM |
| Edge Condition | Prevents stress concentration and flashover | Chamfering, edge breaking | Visual, optical comparator |
| Thermal Stability | Maintains dimensions and properties across temperature range | Material selection, controlled processing | Material data sheet |
Capability Context
Where relevant to insulator manufacturing, Korecera's demonstrated capabilities include:
| Capability | Relevance to Insulators |
|---|---|
| Dimensional tolerance ±0.003 mm | Conductor clearance and mounting fit |
| Thin-wall machining to 0.3 mm | Thermal insulators with minimal wall thickness |
| Custom 3D geometries | Complex profiles for creepage optimization |
| Surface finish Ra 0.02 μm | Smooth surfaces to reduce contamination retention |
Capabilities shown represent demonstrated or achievable manufacturing results. Final specifications depend on ceramic material, part size, geometry, feature location, wall thickness, surface requirements and inspection method. Requirements are confirmed during drawing review.
Typical Applications
Power Electronics
Bus bar insulation, capacitor standoff, IGBT module isolation
Semiconductor Equipment
Chamber feedthroughs, heater isolation, electrode standoffs
Energy Systems
High-voltage standoff, sensor isolation, ignition system insulators
Scientific Instruments
Vacuum feedthroughs, detector isolation, beamline components
What to Include in Your Drawing or RFQ
- -Material / grade (e.g., 99.5% Alumina, Macor, Y-TZP)
- -Drawing or CAD file (2D PDF/DWG or 3D STEP/IGS)
- -Critical dimensions: profile geometry, conductor bore, mounting features
- -Tolerance / GD&T (critical clearances, mounting fit)
- -Surface finish requirements (if applicable)
- -Quantity (prototype or production volume)
- -Inspection requirements (FAI, dimensional report)
- -Operating conditions (voltage range, temperature, environment)