Resisting Thermal Fatigue: Analyzing Aging Mechanisms and Material Stability of Thermal Gap Pads
In thermal engineering, the initial conductivity is only part of the story. The “performance retention” over a 5-to-10-year operational cycle is what determines the longevity of electronic products. When Thermal Gap Pads are exposed to continuous thermal cycling, their microscopic structures undergo rigorous stress.
Chemical Principle: Stability of Siloxane Bonds vs. Oxidative Degradation
The thermal stability of silicone stems from the Si-O (Siloxane) backbone. However, degradation can still occur under extreme conditions:
Side-chain Oxidation: Methyl groups on the silicone chain can undergo oxidative cross-linking at extreme temperatures, increasing the material’s modulus and hardness. This compromises conformability and increases interfacial thermal resistance.
Outgassing: Volatile low-molecular-weight siloxanes can escape at high temperatures. This not only causes material shrinkage but can also lead to electrical contact failure if the siloxanes deposit on sensitive components.
Industrial Application: Automotive and 5G Infrastructure
Lixing Composite Material addresses these aging pain points through advanced formulation:
Anti-Dryness Technology: Our Gap Pads remain flexible under continuous $150^\circ\text{C}$ operation, ensuring the thermal path between the heatsink and chip remains intact.
Low Oil-Bleed Control: By optimizing cross-link density, we prevent oil migration from contaminating PCB solder joints, which is critical for high-precision optical modules.
