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Research on Adhesion Performance of Silicone Gel for Power Module Packaging Regulated by Crosslink Structure and
Xiangze An1, Dongxin He1, Xiaobin Zheng1
1School of Electrical Engineering, Shandong University, Jinan 250061, China.
Gels (Basel, Switzerland)
|July 27, 2026
Summary
Improving silicone gel adhesion for high-voltage power modules is crucial for device reliability. Adjusting crosslink structure and adding silane coupling agents significantly enhance adhesion strength without compromising insulation performance.
Area of Science:
- Materials Science
- Polymer Chemistry
- Electrical Engineering
Background:
- Silicone gel used in high-voltage power module packaging suffers from poor intrinsic adhesion, leading to interfacial failure and reduced device reliability.
- Enhancing adhesion is critical for ensuring the long-term performance and safety of power electronic devices.
Purpose of the Study:
- To improve the adhesion performance of silicone gel for power module packaging.
- To investigate the effects of crosslink network structure and interfacial modification on adhesion strength.
- To evaluate the impact of silane coupling agents on adhesion and insulation properties.
Main Methods:
- Silicone gel crosslink network structure was modified by adjusting the ratio of side-hydrogen-containing silicone oil to terminal-hydrogen-containing silicone oil.
- Interface adhesion was enhanced by incorporating three different silane coupling agents (KH560, KH570, A171) at various concentrations.
- Adhesion strength was quantified using lap shear experiments, and insulation performance was assessed via breakdown tests.
Main Results:
- Optimal adhesion strength of 0.0921 MPa was achieved with a side-hydrogen to terminal-hydrogen ratio of 16:24.
- KH560 silane coupling agent demonstrated the most significant improvement, reaching 0.1356 MPa adhesion strength (47% increase) at 4% addition.
- KH570 showed effectiveness only at low concentrations, while A171 had minimal impact due to vinyl group interference in the crosslink network.
- All modification strategies maintained acceptable insulation performance.
Conclusions:
- Modifying the crosslink network structure and utilizing appropriate silane coupling agents are effective strategies for enhancing silicone gel adhesion.
- KH560 is a highly effective silane coupling agent for improving silicone gel adhesion in power module packaging.
- The study provides a viable approach for improving the adhesion reliability of silicone gels in demanding power electronic applications.
