Heat Radiating Member Metal Layer Solderability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge is to develop a heat radiating member with high bondability for semiconductor elements, as composite materials with exposed diamond or SiC particles have poor wettability and smoothness, making soldering and brazing difficult due to their nonmetallic inorganic surfaces.
Innovation Solution
A heat radiating member is created with a composite portion containing thermally conductive particles in a metal matrix, and a metal layer formed on its surface using a metal powder, which enhances adhesion and solderability by filling surface projections and depressions, thereby improving bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a composite material with exposed diamond or SiC particles is used as the heat radiating member, then high thermal conductivity is achieved, but solderability and brazability deteriorate due to poor wettability of the nonmetallic inorganic particle surfaces
Solution Approach 1:
A metal layer is introduced as an intermediary between the composite material surface and the solder/brazing material. This metal layer具有良好的 wettability and acts as a mediator that enables reliable bonding while the underlying composite material maintains its high thermal conductivity through exposed diamond or SiC particles.
Solution Approach 2:
The invention creates a multi-layer composite structure combining the high-thermal-conductivity composite material (metal matrix with diamond/SiC particles) and a metal layer with good wettability. This composite structure simultaneously achieves both high thermal conductivity and excellent solderability/brazability.
2Reliability
If a composite material with exposed diamond or SiC particles is used, then high thermal conductivity is achieved, but surface smoothness deteriorates making bonding difficult
Solution Approach 1:
The metal layer serves as an intermediary that provides a smooth bonding surface while the underlying composite material maintains its high thermal conductivity through exposed diamond or SiC particles. The metal layer masks the surface irregularities of the composite material.
Solution Approach 2:
The invention applies different surface qualities to different regions: the metal layer provides a smooth surface for bonding, while the composite material beneath maintains its high thermal conductivity through exposed particles. Each layer performs its specific function locally.
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 solution provides a heat radiating member with improved solderability and brazability, ensuring strong adhesion and effective heat radiation while maintaining high thermal conductivity and endurance through a metal layer with fine crystalline structure and small crystal grain size.
Implementation Method 1
thereon a powder, plate or the like of a metal that will serve as a metal matrix is disposed, and in that condition they are heated and the metal is thus molten and infiltrated between the particles
Implementation Method 2
a composite portion composed of a composite material which contains particles of a satisfactorily thermally conductive material in a metal matrix
Data Source
AI summary
A heat radiating member includes: a composite portion composed of a composite material which contains particles of a satisfactorily thermally conductive material in a metal matrix; and a metal layer formed on at least one surface of the composite portion and composed of a metal. A method for producing a heat radiating member includes: a preparation step to prepare a composite material which contains particles of a satisfactorily thermally conductive material in a metal matrix; a powder arrangement step to dispose a metal powder composed of metal particles on at least one surface of the composite material; and a heating step to heat the composite material and the metal powder, with the metal powder disposed on the composite material, to form a metal layer composed of a metal of the metal powder on a composite portion composed of the composite material.