Introduction to Silicon Carbide Thermal Conductivity

1. A Brief Review on Silicon Carbide

Silicon carbide, with the chemical formula SIC, is a high-temperature resistant material with high thermal conductivity. 

It is made by smelting raw materials such as quartz sand, petroleum coke (or coal coke), and wood chips through a resistance furnace at high temperatures.

30 grit black silicon carbide

2. What is Thermal Conductivity?

Thermal conductivity, commonly denoted by the symbol k, is a physical property that quantifies a material’s capacity to conduct heat. 

Thermal conductivity describes the ability of a material to conduct heat under temperature gradients, that is, how the heat in the material is transferred in space. The unit of thermal conductivity is usually watts per meter per Kelvin (W/(m · K)).

3. Introduction to Materials With the Highest Thermal Conductivity

In nature, there are many materials with very high thermal conductivity. Let’s take a look at these materials.

Rank

Material

Thermal Conductivity (W/m•K)

1

Diamond

2000 – 2200

2

Silver

429

3

Copper

398

4

Gold

315

5

Aluminum Nitride

310

6

Silicon Carbide

270

7

Aluminum

247

8

Tungsten

173

9

Graphite

168

10

Zinc

116

4. Introduction to Silicon Carbide Thermal Conductivity

The thermal conductivity of silicon carbide is usually around 270 W/(m·K). This makes it have excellent thermal conductivity in high-temperature environments, making it suitable for many high-performance applications.

Silicon carbide has multiple polymorphic forms, such as 4H SiC and 6H SiC, and the structural differences of different polymorphic forms may lead to changes in thermal conductivity.

5. The Main Factors Affecting Silicon Carbide Thermal Conductivity

Generally speaking, within a specific temperature range, the higher the temperature, the higher the thermal conductivity of silicon carbide.

Crystal Structure:

The thermal conductivity varies with different crystal structures, such as the different crystal forms of silicon carbide, 4H SiC and 6H SiC.

Purity:

The higher the purity, the higher the thermal conductivity, which is also one of the main factors affecting the thermal conductivity performance.

Pressure:

Pressure can alter the crystal structure of materials, thereby affecting their thermal conductivity. Under high pressure conditions, the thermal conductivity of silicon carbide may change.

Material Density:

The density of silicon carbide affects its thermal conductivity because it affects the distance between atoms.

The Microstructure of the Material:

Microstructural factors such as grain size and grain boundaries may also have an impact on thermal conductivity.

6. Application of Thermal Conductivity of Silicon Carbide

Application in the field of electronics:

Due to its high thermal conductivity and excellent electronic properties, silicon carbide is widely used in the field of electronics, especially in power devices.

Thermal management:

Due to its excellent thermal conductivity, silicon carbide is often used in thermal management applications such as radiators, thermal pads, etc.

Semiconductor industry:

In the semiconductor industry, the thermal conductivity of silicon carbide is usually utilized to improve the performance of semiconductor devices.

Photovoltaic applications:

In the solar photovoltaic industry, the thermal conductivity of silicon carbide helps to dissipate heat and improve the efficiency of solar cells.

7. Silicon Carbide Supplier

With the development of technology and market demand, the thermal conductivity of silicon carbide has broad market prospects. As a supplier of silicon carbide products with a nineteen year history, Yafeite offers silicon carbide products with advantages of high quality, low impurities, customizability, and complete services, thus having strong competitiveness in both international and domestic markets.

If you have any questions about our products and services, please feel free to inquire.

Email: info@sdgangtie.com

Phone: +8618654501991

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