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    The causes of color difference in AlN ceramics are related to raw material preparation, processing technology (sintering temperature fluctuation, protective atmosphere), microstructure, and environmental factors. The following provides a comprehensive analysis based on related research:   1. Surface Color Change Due to Oxidation Behavior AlN ceramics easily react with oxygen at high temperatures to form aluminum oxide (Al₂O₃). The thickness and structure of the oxide layer significantly affect the surface color.   Oxidation kinetics: Differential thermal analysis shows that the mass change of AlN during variable temperature oxidation is related to the degree of oxidation. Different stages of the oxidation reaction may be accompanied by gradual changes in color.   2. Influence of Preparation Process and Raw Material Purity Difference in synthesis methods: The hydrothermal–carbothermal synthesis method can reduce impurity introduction by regulating precursor h...

  Due to its high thermal conductivity (≥170W/m.k),   aluminum nitride ceramic crucibles   can be used for heat conduction to achieve heating effects, and are widely used in electronic equipment, such as gas atomization of electronic devices. Aluminum nitride crucibles  can also be used as containers for vacuum evaporation and metal smelting, especially suitable for  vacuum evaporation crucibles  for AlN. Because  aluminum nitride ceramics  are heated in a vacuum with low vapor pressure, and will not pollute aluminum even if they decompose. In the semiconductor industry, using an  aluminum nitride crucible  instead of a quartz crucible to synthesize arsenide can completely eliminate the pollution of Si to GaAs and obtain high-purity products. Aluminum Nitride Ceramic Crucibles Other Typical Applications of Aluminum Nitride Ceramics 1. Application of optical communication devices 2. Dedicated refrigerator 3. LED industry 4. Automotive ele...

  About Hot-Pressed Aluminum Nitride (AlN) Hot pressed aluminum nitride ceramics  are sintered by vacuum hot pressing. The aluminum nitride purity is up to 99.5%(without any sintering additives), and density after hot pressing reaches 3.3g/cm3, it also has excellent thermal conductivity and high electrical insulation. The thermal conductivity can be from 90 W/(m·k) to 210 W/(m·k). The aluminum nitride ceramic mechanical strength and hardness of the product after high temperature and high pressure are better than those of the tape casting process, dry pressing and cold isostatic press method. Hot pressed aluminum nitride ceramics have high temperature resistance and corrosion resistance, and will not be eroded by various molten metals and molten hydrochloric acid. Typical Application of Aluminum Nitride (AlN) Cooling cover and magnetic resonance imaging equipment As the substrate of high-frequency surface acoustic wave device, large-size and high-power heat dissipation in...

Aluminum nitride   (AIN) is known for its high thermal conductivity and excellent electrical insulation properties. It is a common ceramic material used in a variety of electrical devices. In addition to its coefficient of thermal expansion and electrical insulation capabilities,   aluminum nitride ceramics   are resistant to most molten metals, such as copper, lithium and aluminum. Properties of aluminum nitride ceramics: Aluminum nitride has a variety of properties that make it suitable for a variety of industrial applications: High thermal conductivity (above 170 W/mK). This is close to the value of BeO and SiC and more than five times that of aluminum oxide (Al2O3). Its coefficient of thermal expansion is 4.5 *10-6°C, the same as that of silicon (3.5-4 *10-6°C). It has good light transmission properties It is not toxic. Good electrical conductivity. Aluminum nitride’s electrical properties include its dielectric constant, dielectric loss, bulk resistivity and dielectr...

Source: https://www.innovacera.com/news/the-main-application-of-aluminum-nitride-ceramics.html Aluminum nitride is a new type of ceramic material with excellent comprehensive performance. It has excellent thermal conductivity and thermal shock resistance, reliable electrical insulation. Because of the liquid phase sintering and no second phase at the grain boundary, the crystal structure is very dense and has good Resistance to plasma corrosion. A series of excellent characteristics such as low dielectric constant and dielectric loss, non-toxic and thermal expansion coefficient matching silicon, are considered to be ideal materials for a new generation of highly integrated semiconductor substrates and electronic device packaging and are widely used at home and abroad attention. Prime Features: High thermal conductivity Excellent thermal shock resistance Excellent insulation, >15KV / mm Plasma etching resistance Good shock resistance Non-toxic Excellent mechanical properties Applica...

Source: https://www.innovacera.com/news/aluminium-nitride-ceramics.html With the development of the electric components, smaller but better performance and lower energy cost element are pressing demand. The high dense, high power and a high-frequency component may generate as much as 100W/cm2 heat, such as high bright LED, MOSFET, IGBT and laser elements. The longer those elements work, the more the heat accumulated. Due to the limited room in the package, if the heat could not have been diffused in time, it would highly affect the elements’ life, performance and reliability. So, it is important to introduce good cooling package design and high thermal conductivity ceramic materials into these industries. Different applications in general High brightness high power LED Microwave wireless communication and semiconductor equipment Automobile Energy IGBT Module IPM Module