technical ceramic solutions

What Are The Factors That Affect The Thermal Conductivity Of AlN Ceramic Substrates?

First of all, let’s overview AlN Ceramics
AlN is a covalently bonded compound with a stable structure and hexagonal wurtzite structure without the existence of other allotypes. Its crystal structure is the AlN4 tetrahedron produced by the disproportionation of aluminum atoms and adjacent nitrogen atoms as the structural unit; the space group is P63mc, which belongs to the hexagonal crystal system.

The main features of aluminum nitride ceramics:
(1) High thermal conductivity, which is 5-10 times that of alumina ceramics;
(2) The thermal expansion coefficient (4.3×10-6/℃) matches the semiconductor silicon material (3.5-4.0×10-6/℃);
(3) Good mechanical properties;
(4) Excellent electrical properties, with extremely high insulation resistance and low dielectric loss;
(5) Multi-layer wiring can be performed to achieve high density and miniaturization of packaging; (6) Non-toxic, good Conducive to environmental protection.

Various factors affecting the thermal conductivity of AlN ceramics
At 300K, the theoretical thermal conductivity of AlN single crystal material is as high as 319W/(m K), but in the actual production process, due to the purity of the material, internal defects (dislocations, pores, impurities, lattice distortion), grain The thermal conductivity is also affected by various factors such as orientation and sintering process, which are often lower than the theoretical value.

In summary:
Selecting the appropriate sintering aids in the composite system can achieve a lower sintering temperature of AlN and effectively purify the grain boundaries, and obtain AlN with higher thermal conductivity.

What Are The Factors That Affect The Thermal Conductivity Of AlNCeramic Substrates

What Are The Factors That Affect The Thermal Conductivity Of AlNCeramic Substrates

AlN Schematic diagram of the crystal structure

AlN Schematic diagram of the crystal structure

Related Products

  • Ceramic Packages

    Ceramic Packages

    Ceramic packaging is the "case" that uses ceramic materials (like alumina, aluminum nitride, or beryllium oxide) as the housing or substrate for integrated circuits. It's a protective enclosure or bas…

  • Metallised Ceramic Rings for Image Intensifier Tubes

    Metallised Ceramic Rings for Image Intensifier Tubes(IIT)

    Innovacera’s metallised ceramic rings are used in image intensifier tubes for night vision equipment and other instrument.

  • Alumina Ceramic Focus Rings

    Alumina Ceramic Focus Rings

    Alumina Ceramic Focus rings are designed to improve etch uniformity around the wafer edge or perimeter. When used with an electrostatic chuck (e-chuck), the wafer rests on the edge focus ring - held i…

Enquiry