Functionally Graded PCB Composite Material for Heat and Insulation
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Solution Overview
Problem
Conventional polymer-based PCBs lack sufficient heat dissipation and durability, while metal-based PCBs require an additional insulating layer process that degrades thermal conductivity.
Innovation Solution
A functionally graded composite material is manufactured by laminating mixed powders of aluminum or aluminum alloy, magnesium, and polymer or ceramic powders, then sintered using pressureless or spark plasma sintering to create a material with varying polymer or ceramic content, achieving high heat dissipation and electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If polymer-based PCB is used, then electrical insulation is achieved, but heat dissipation performance is insufficient
Solution Approach 1:
The patent uses a composite material consisting of metal powder (aluminum or aluminum alloy) combined with polymer powder to create a functionally graded composite material. This composite structure enables the material to simultaneously achieve high heat dissipation performance from the metal component and electrical insulation from the polymer component, resolving the contradiction between thermal conductivity and electrical insulation.
Solution Approach 2:
The patent implements a functionally graded structure where the composition ratio of metal powder to polymer powder varies continuously from the bottom to the top surface of the PCB substrate. The metal powder content is higher near the bottom surface for enhanced heat dissipation, while the polymer powder content increases toward the top surface for improved electrical insulation, allowing different regions to optimize for different functions.
2Temperature
If metal-based PCB is used, then heat dissipation is improved, but additional insulating layer process is required which degrades thermal conductivity
Solution Approach 1:
The patent merges the heat dissipation function and electrical insulation function into a single integrated composite material layer, eliminating the need for separate insulating layers. The functionally graded composite material simultaneously provides thermal conductivity and electrical insulation properties in one material system, simplifying the manufacturing process by removing additional processing steps.
Solution Approach 2:
The composite material serves multiple functions simultaneously: the metal powder component provides heat dissipation, the polymer powder component provides electrical insulation, and their graded combination provides both mechanical support and electrical isolation in a single layer, making the material universal for multiple requirements without needing separate specialized layers.
3Reliability
If insulating layer is added to metal-based PCB, then electrical insulation is achieved, but thermal conductivity is degraded
Solution Approach 1:
The patent changes the composition parameter by varying the ratio of metal powder to polymer powder continuously through the thickness of the PCB substrate. This gradient composition allows the material to optimize both electrical insulation and thermal conductivity simultaneously, as the metal content is adjusted to provide necessary thermal pathways while the polymer content provides electrical insulation, avoiding the thermal conductivity degradation caused by complete insulating layers.
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 method produces a PCB material with enhanced thermal conductivity and electrical insulation, eliminating the need for an insulating layer and preventing thermal conductivity degradation.
Implementation Method 1
a functionally graded laminate is formed by laminating a metal powder including aluminum and magnesium and a mixed powder including an electrically insulating polymer and/or ceramic powder... a material for a PCB having high heat dissipation and electrical insulation at the same time can be obtained by the excellent thermal conductivity of a metal base
Implementation Method 2
a mixed powder including an electrically insulating polymer and/or ceramic powder... the electrical shielding ability by introducing insulating particles
Implementation Method 3
preparing a functionally graded composite material by sintering the functionally graded laminate by pressureless sintering or spark plasma sintering
Data Source
AI summary
A method for manufacturing a functionally graded composite material for a printed circuit board (PCB) is proposed. The method may include preparing two or more types of mixed powders with different contents of polymer or ceramic powder, each mixed powder comprising (i) a metal powder comprising a powder made of aluminum or an aluminum alloy and a powder of magnesium and (ii) the polymer or ceramic powder. The method may also include laminating the two or more types of mixed powders to form a functionally graded laminate in which a ratio of the content of the polymer or ceramic powder to the content of the metal powder in each of layers stacked in sequence from bottom to the top of the laminate differs. The method may further include preparing a functionally graded composite material by sintering the functionally graded laminate by pressureless sintering or spark plasma sintering.