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What is the aluminum silicon carbide substrate and the advantages and disadvantages of the aluminum silicon carbide substrate

2022-07-28

Aluminum silicon carbide substrate (AlSiC) is the abbreviation of aluminum-based silicon carbide particle reinforced composite material, also known as silicon carbide aluminum or aluminum silicon carbon, which is applied in the field of railway locomotives, aircraft, semiconductor IGBT devices, military and other products. Today Xiaobian to share the advantages and disadvantages of aluminum silicon carbide substrate:

First, the advantages of aluminum silicon carbide substrate

1. AlSiC has high thermal conductivity (170~200W/mK), which is ten times that of general packaging materials. It can dissipate the heat generated by the chip in time and improve the reliability and stability of the entire component

2. The thermal expansion coefficient of AlSiC is well matched with the semiconductor chip and the ceramic substrate, and the adjustable thermal expansion coefficient (6.5~9.5 × 10-6/K) can prevent fatigue failure, and even the power chip can be directly mounted on the AlSiC substrate.

3. The aluminum silicon carbide substrate has light weight, strong hardness, high bending strength and good seismic effect. materials in harsh environments.

In addition, aluminum silicon carbide substrate (AI/SiC) has attracted more and more attention due to its advantages of low raw material cost, high thermal conductivity, low density and strong plasticity. The thermal expansion coefficient of SiC particles is similar to that of the LED chip substrate, and has high elastic modulus and low density. At the same time, the characteristics of high thermal conductivity, low density, low cost and easy processing of aluminum make it have unique advantages when used as a substrate material.

Two,

Disadvantages of aluminum silicon carbide substrate

The processing difficulty of aluminum-based silicon carbide is high, mainly in its very high hardness. Silicon carbide, also known as emery, is a very hard material, hardness second only to diamond, and aluminum-based silicon carbide as a composite material of aluminum particles and silicon carbide, its hardness increases with the increase of silicon carbide content, in the cutting process, will seriously wear the tool, so that the processing cost.

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Introduction of Aluminum Silicon Carbide Preparation Technology

According to the structural design requirements, making the reinforcement material SiC evenly distributed in the matrix is also one of the key technologies in the manufacture of aluminum silicon carbide materials. Especially in the low volume aluminum silicon carbide stirring method, vacuum pressure infiltration method, powder metallurgy method, the agglomeration of SiC particles, and the uniform distribution of SiC particles of different sizes is a difficult point.

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