Aplikasi
Polimer konduktif termal dan isolatif listrik
Decision guide for Hexagonal Boron Nitride (hBN), hBN x AlN (hBNxAlN), and evaluation-stage AX-DND diamond-filler studies that target higher polymer thermal transport while preserving electrical insulation.
Jawaban singkat
Use hBN as the first-pass electrically insulating thermal filler and compare hBNxAlN when a reviewed hybrid packing route can improve directional heat transport without breaking viscosity, insulation, or reliability limits. Screen AX-DND only as a formulation-specific development route with finished-compound thermal, dielectric, rheology, cure, and aging data.
What Are Thermally Conductive & Electrically Insulating Polymers?
Thermally conductive and electrically insulating polymer systems move heat through adhesives, gap fillers, potting compounds, films, housings, or molded parts without creating an electrical leakage path.
Mekanisme
Move heat while maintaining electrical separation and mechanical integration.
The mechanism depends on the following system interfaces:
- filler orientation and in-plane versus through-plane heat path
- polymer wetting, cure, viscosity, and maximum loading
- bondline, void, contact pressure, and component geometry
Pemilihan material
Read each row as a scenario-specific route: the guidance explains why a material fits, while the rejection boundary shows when to stop screening it.
| Scenario | Materials | Guidance |
|---|---|---|
| Electrically insulating thermal polymer compound | hBN | Use hBN when dielectric isolation, polymer processability, and thermal spreading must be balanced in one filler system. |
| Hybrid ceramic packing or through-thickness pathway study | hBNxAlN | Compare hBNxAlN only when the exact hybrid grade, moisture behavior, loading, interface resistance, and electrical insulation can be qualified. |
| Diamond-filled polymer or TIM formulation study | AX-DND | Treat AX-DND as an evaluation-stage filler only; qualify aggregate state, surface chemistry, loading, rheology, voids, cure, directional transport, dielectric behavior, mechanics, and aging in the finished compound. |
Scope Boundary
- This is not a generic thermal composite category; simultaneous heat transfer and electrical insulation define the application.
- Do not use this route when the thermal pathway is also intended to carry electrical current; electrical insulation is a defining requirement.
Scenarios and Subtypes
Use the host-system or subtype constraint to narrow the material direction before comparing grades or supplier data.
| Scenario | Key constraint | Material direction |
|---|---|---|
| TIMs, pads, greases, and adhesives | Through-thickness heat transfer, bondline, wetting, pump-out, cure, and dielectric isolation. | hBN first; hBNxAlN after hybrid-grade qualification. |
| Potting and encapsulation | Fill, void control, cure exotherm, thermal cycling, and electrical insulation around components. | hBN or reviewed hBNxAlN packing systems. |
| Molded thermoplastics and thermosets | Flow, orientation, tool wear, anisotropy, dimensional stability, and insulation in the finished part. | hBN selected by particle architecture and process route. |
Target Performance Bands
Compare thermal and dielectric results together at matched loading, orientation, direction, geometry, interface, temperature, process, and aging conditions.
| Metric | Target range | Unit | Kondisi | Required |
|---|---|---|---|---|
| Thermal transport | Define effective conductivity or resistance by direction and final geometry. | W/mK or K·cm2/W | Final compound, bondline, film, or molded part. | yes |
| Electrical insulation | Define resistivity, dielectric strength, leakage, and loss acceptance. | ohm-cm, kV/mm, µA or mA leakage, tan δ | Before and after humidity and thermal aging. | yes |
| Processability and filler loading | Keep viscosity, melt flow, dispensing, molding, film formation, void content, and filler loading inside the production process window. | Pa·s, mPa·s, MFI, wt%, vol%, void %, pass/fail | Final resin, cure, shear rate, temperature, equipment, filler grade, and part or bondline geometry. | yes |
| Mechanical and aging retention | Adhesion, modulus, flexibility, toughness, pump-out, thermal cycling, humidity, and dielectric retention remain inside assembly acceptance. | MPa, %, N/mm, cycles, hours, Δthermal %, Δresistivity % | Final compound, interface, pressure, service temperature, humidity, and cycling profile. | yes |
Mode kegagalan
Use failure rows to identify a measurable trigger and the corresponding design response.
| Failure type | Root cause | Manifestation | Mitigation strategy |
|---|---|---|---|
| Thermal target is missed | Intrinsic filler properties did not translate into the final polymer geometry. | Large difference between intrinsic expectations and measured compound or assembly performance. | Adjust particle architecture, packing, orientation, loading, void control, and bondline design. |
| Electrical insulation degrades | The formulation or assembly introduced a leakage or breakdown path. | Resistivity loss, leakage rise, partial discharge, or dielectric breakdown after exposure. | Control purity, co-fillers, dispersion, voids, thickness, humidity, and processing cleanliness. |
| Compound becomes unprocessable | The filler package exceeds viscosity, flow, dispensing, molding, or film-forming limits. | High torque, incomplete fill, trapped voids, poor leveling, or unstable dispensing. | Change grade, packing distribution, surface treatment, loading, or resin process. |
Data validasi yang diminta
| Measurement requested |
|---|
| In-plane and through-plane thermal conductivity or thermal resistance with method and specimen geometry. |
| Volume resistivity, dielectric strength, leakage, and dielectric loss before and after aging. |
| Viscosity, flow, dispensing, molding, cure, void, and filler-orientation data. |
| Adhesion, modulus, flexibility, toughness, pump-out, and thermal cycling evidence. |
| Humidity, hydrolysis, thermal aging, and service-media exposure data. |
FAQ
Why not select by intrinsic filler thermal conductivity alone?
Polymer interfaces, particle contact, orientation, voids, and geometry determine how much intrinsic performance reaches the finished part.
When should hBNxAlN be considered?
Consider the hybrid when pathway continuity or packing needs improvement and exact-grade moisture, insulation, viscosity, and aging data are available.
Can conductive carbon be added to improve heat transfer?
Only when the electrical insulation requirement permits it; otherwise conductive carbon can create leakage or breakdown risk.
What information is needed for an RFQ?
Provide resin and cure, thermal direction and method, insulation requirement, loading and viscosity limits, geometry, and aging profile.