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Where is the application field of ceramic substrates? What are the materials?

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What are the ceramic packaging materials? Ceramic substrates are primarily used in electronic packaging. The ceramic package is a hermetic package, and the ceramic package material mainly includes Al2O3, BeO and AlN. The advantages of ceramic packaging are good moisture resistance, high mechanical strength, low heat shrinkage factor and high thermal conductivity. However, the thermal conductivity of Al2O3 ceramics is relatively low; BeO ceramics have higher thermal conductivity, but their toxicity and high consumption cost; the preparation process of AlN ceramics is messy and costly.
Introduction to the field of use of ceramic substrates
The ceramic substrate is used in some high-power conductive boards of high-speed rail cars.
Ceramic substrates have higher stability at higher temperatures
The gold layer of the ceramic substrate is still stable at 800 °C.
Ceramic substrate used in high voltage transmission and transformation grid
Ceramic substrate for high power radio transmission
The use of ceramic circuit boards in the field of microwave radiation
The ceramic substrate has better heat conduction and heat dissipation function in the laser emitter
The ceramic substrate is used in high-power circuits such as inverters for electric cars, USP power supplies, and electric car charging posts.
Alumina porcelain can be used to make high-speed cutting tools and wear parts, furnace tubes, thermocouple maintenance tubes, high temperature vessels, electrical insulation and electric vacuum equipment, nozzles for injection molding machines, molds for cylinder molding, calipers, bushings, and scribe lines. , welding fixtures, grinding fixtures, mechanical seal parts, chemical equipment requiring wear and corrosion resistance. The end face seal rings of various pumps made of silicon nitride ceramic and silicon carbide ceramic have a much higher life than the hard alloys. The research work of silicon nitride and silicon carbide materials as parts and bearing materials for car industry is receiving more and more attention. Zirconia materials are also very effective as oxygen sensors for boiler and car exhaust systems. The most absorbent use of special ceramic materials is as a heat engine material, which can greatly advance the efficiency of the heat engine. The most promising ones are silicon nitride, silicon carbide, SIALON and partially stabilized zirconia.
What are the ceramic packaging materials?
Al2O3 ceramic substrate
Al2O3 ceramics generally refer to various ceramics with Al2O3 as the primary raw material, α-Al2O3 as the main crystalline phase and Al2O3 content of 75% or more. It has abundant raw materials, low price, high mechanical strength and hardness, and excellent insulation function. It has a heat-shock function, excellent chemical corrosion resistance, high dimensional accuracy, and good metal adhesion. It is a ceramic substrate material with better comprehensive functions.

Most of the Al2O3 ceramic substrates currently used use multilayer substrates, and the content of Al2O3 accounts for 85% - 99.5%. In the meantime, 96% Al2O3 ceramic substrates are commonly used for consumption such as thick film circuit substrates, chip equipment and the like. The thermal conductivity of Al2O3 at room temperature is 29W/(m·K), which is close to the thermal conductivity of steel. With the advancement of alumina content, the thermal conductivity of alumina ceramic substrate is greatly improved, followed by Al2O3 content. When the Al2O3 ceramic substrate is heated, the electrical insulation function and thermal conductivity of the Al2O3 ceramic substrate will advance, but together, the firing temperature will rise, the energy consumption will be increased, and the kiln furniture will be worn out.

Ceramic substrates

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