Overlapping Thermal Interface Material Structure for GPU Packaging
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Solution Overview
Problem
Current thermal interface materials face challenges such as grease pumping, limited gap filling capability, and high processing costs, particularly in high-strain and variable gap applications like high-power GPU packaging, where existing solutions suffer from thermal degradation, adhesion loss, and complex processing requirements.
Innovation Solution
A thermal interface material structure comprising a first layer of gap filler material and a second layer of a solid thermal pad, with overlapping regions to address the limitations of single-layer solutions, providing improved gap filling and thermal performance across varying gap sizes without the need for plasma cleaning or complex curing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermal grease is used, then gap filling capability and thermal conductivity are improved, but grease pumping leads to interface voiding and thermal degradation
Solution Approach 1:
The patent combines thermal grease with a compressible substrate to create a composite thermal interface material. The grease fills gaps and provides thermal conductivity, while the substrate prevents pumping and maintains structural integrity, resolving the contradiction between thermal performance and reliability.
2Temperature
If thermal pads are used, then thermal conductivity and ease of use are improved, but compressibility and gap filling capability are limited
Solution Approach 1:
The patent creates a composite structure where thermal grease is applied to a compressible substrate. This combination provides both the thermal conductivity of grease-like materials and the compressibility needed for gap filling, overcoming the limitations of solid thermal pads.
Solution Approach 2:
The patent changes the physical state parameters by combining a viscous material (grease) with a compressible solid substrate, creating a material that exhibits both fluid-like gap filling and solid-like structural support, thereby improving adaptability to varying gap conditions.
3Temperature
If thermal gels are used, then gap filling capability and thermal conductivity are improved, but plasma cleaning and cure regimens are required
Solution Approach 1:
The patent uses a compressible substrate that can be easily disposed of or replaced, eliminating the need for expensive plasma cleaning and cure regimens. The substrate serves as a carrier that simplifies the application process and removes complex processing requirements.
4Ease of manufacture
If single-layer thermal interface materials are used, then manufacturing simplicity is maintained, but performance across varying gap sizes is limited
Solution Approach 1:
The patent creates a two-layer composite structure where grease is applied to a compressible substrate. This simple manufacturing process produces a material that adapts to varying gap sizes, combining the ease of manufacture with improved versatility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The overlapping thermal interface material structure enhances thermal performance, reduces costs, and simplifies processing, offering improved reliability and mechanical robustness by combining the benefits of gap filling and compressibility, while preventing damage from mechanical shocks and vibrations.
Implementation Method 1
The TIM structure includes a first thermal interface material layer and a second thermal interface material layer that at least partially overlaps the first thermal interface material layer
Data Source
AI summary
In an example, a thermal interface material (TIM) structure is disclosed. The TIM structure includes a first thermal interface material layer comprising a gap filler material and a second thermal interface material layer comprising a solid thermal pad. The TIM structure has one or more overlapping regions associated with partial overlap of a surface of the gap filler material by the solid thermal pad such that a portion of the surface is exposed.