About Aluminum Nitride (ALN) Ceramic

Aluminum nitride (AlN) has high thermal conductivity and electrical insulation, which makes it can be used in various electronic equipment. The aluminum nitride thermal conductivity is 180W / (m.k), which is 5-8 times higher than that of alumina ceramics. Therefore, AlN Ceramics have good thermal shock resistance and can be used in extremely hot environment at 2200 ℃.

What is Aluminium nitride made of  ?

Aluminum nitride (AlN) is a covalent bond compound, atomic crystal, diamond-like nitride, hexagonal system, wurtzite crystal structure, non-toxic, white or grey white,The chemical composition is AI 65.81%, N 34.19%, theoretical density 3.26g/cm3.

Precision products made of Aluminum nitride(AlN) Ceramics

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We Supply ALN Ceramic:

Machining

Materials

Aluminum Nitride Properties

  • High thermal conductivity (about 180W/m.K), close to BeO and SiC, more than 5 times that of Al2O3;
  • The thermal expansion coefficient (4.5 *10-6℃) matches that of Si (3.5-4 *10-6℃) and GaAs (6 *10-6℃);
  • Good electrical properties (dielectric constant, dielectric loss, bulk resistivity, dielectric strength);
  • Good mechanical properties, higher bending strength than Al2O3 and BeO ceramics, sintering under normal pressure;
  • Good light transmission characteristics;
  • Non-toxic

Aluminium Nitride Parameter table

 

ITEM

UNITS

TEST

AlN

Color

Gray

Content(%)

99.9%

Main Characteristics

High Electrical Insulation, High Thermal Conductivity

Main Applications

Heat Uniformity Parts,High Temperature Treatment Fixtures,Semiconductor Processing Equipment Parts

Density (*1)

g/cm3

JIS R 1634

3.2

Water Absorption

JIS C 2141

0

Vickers Hardness HV9.807N

GPa

JIS R 1610

11.2

Flexural Strength 3 P.B.

MPa

JIS R 1601

220

Compressive Strength

MPa

JIS R 1608

Young’s Modulus of Elasticity

GPa

JIS R 1602

310

Poisson’s Ratio

0.24

Fracture Toughness (SEPB)

MPa・m1/2

JIS R 1607

Coefficient of Linear Thermal Expansion

40 - 400℃

× 10-6/K

JIS R 1618

4.6

40 - 800℃

5.2

Thermal Conductivity (20℃)

W/(m・K)

JIS R 1611

170

Specific Heat Capacity

J/(g・K)

JIS R 1611

0.72

Thermal Shock Temperature Difference

JIS R 1648

Dielectric Strength

kV/mm

JIS C 2141

16

Volume Resistivity

20℃

Ω・cm

> 1014

300℃

1011

500℃

109

Dielectric Constant(1MHZ)

8.5

Dielectric Loss Angle(1MHZ)

(×10-4)

2

Loss Factor

(×10-4)

17

Nitric Acid(60%)90℃ ,24H

 

(Weight Loss)
mg/cm2

 

Sulphuric Acid(95%)95℃ ,24H

Sodium Hydroxide(30%)80℃ ,24H

*The values are typical material properties and may vary according to products configuration and manufacturing process. For more details, Please feel free to contact us.

*Aluminum nitride is easy to be oxidized on the surface, which forms a layer of alumina.This helps to protect the material, but it affects the thermal conductivity (alumina is about 30 W/mK).In an oxidative atmosphere, this occurs at about 700℃.In an inert atmosphere, the layer protects AlN at temperatures as high as about 1350℃.When the temperature is higher than this, bulk oxidation occurs.

 

What can AlN Ceramics be used for?

  • Heat sinks & heat spreaders
  • Electrical insulators for lasers
  • Chucks, clamp rings for semiconductor processing equipment
  • Electrical insulators
  • Silicon wafer handling and processing
  • Substrates & insulators for microelectronic devices & opto electronic devices
  • Substrates for electronic packages
  • Chip carriers for sensors and detectors
  • Chiplets
  • Collets
  • Laser heat management components
  • Molten metal fixtures
  • Packages for microwave devices

Customized processing of AlN Ceramics

 

Aluminum nitride can be processed in green or fully dense state. In the green state, it can be processed into complex geometry relatively easily.However, the sintering process that is required to fully densify the material causes the aluminum nitride body to shrink approximately 20%. This shrinkage means that it is impossible to hold very tight tolerances when machining aluminum nitride pre-sintering. In order to achieve very tight tolerances, fully sintered material must be machined/ground with diamond tools.  In this process a very precise diamond coated tool/wheel is used to abrade away the material until the desired form is created. 

 

Great Ceramic is your aluminum nitride machining specialist for your precision ceramic prototyping & manufacturing needs; we are always happy to use our many years of advanced ceramics experience to provide advice on materials, design, and application. If you would like to buy aluminum nitride plates, rods, tubes or custom machined components, please contact us and one of our experts will be happy to assist you.

 

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