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Method for manufacturing spherical aluminum nitride powder

一种制造方法、氮化铝的技术，应用在化学仪器和方法、氮化合物、无机化学等方向，能够解决制造成本提高、工序多等问题，达到导热率高、高导热率的效果

Active Publication Date: 2013-05-01
TOKUYAMA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although high fluidity and high filling rate are obtained by using this method, impurities are easily mixed into the aluminum nitride powder, and strict manufacturing conditions need to be controlled. There are many processes and the manufacturing cost is increased.

Method used

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  • Method for manufacturing spherical aluminum nitride powder
  • Method for manufacturing spherical aluminum nitride powder
  • Method for manufacturing spherical aluminum nitride powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0081] The present invention will be described more specifically below, but the present invention is not limited by these examples. Various physical properties in Examples and Comparative Examples were measured according to the following methods.

[0082] (1) Average particle size

[0083] The sample was dispersed in a sodium pyrophosphate aqueous solution using a homogenizer, and the average particle diameter (D 50 ).

[0084] (2) Particle shape

[0085] The shape of the aluminum nitride powder was observed with a scanning electron microscope (S-2600N manufactured by Hitachi, Ltd.).

[0086] (3) Sphericity of particles (ratio of long diameter to short diameter)

[0087] Select any 100 particles from the photo image of the electron microscope, use a ruler to measure the long diameter (DL) and short diameter (DS) of the particle image, and the average value of the ratio (DS / DL) is used as the benchmark of sphericity.

[0088] (4) Cationic impurity content

[0089] Cationic ...

Embodiment 2

[0103] In addition to changing the Al source of α-alumina to an average particle size of 1.0μm and a specific surface area of ​​12.7m 2 / g of boehmite, a spherical aluminum nitride powder was produced in the same manner as in Example 1.

[0104] Table 1 shows the average particle size and shape of the obtained spherical aluminum nitride powder, the ratio of the major axis to the minor axis of the aluminum nitride particles, the content of cationic impurities, and the C-axis lattice constant of the aluminum nitride crystal. Furthermore, using the obtained aluminum nitride powder, a sheet was produced in the same manner as in Example 1, and the thermal conductivity was measured. The results are shown in Table 1 together.

Embodiment 3

[0106] A spherical aluminum nitride powder was produced in the same manner as in Example 1 except that the firing temperature was set to 1650°C.

[0107] Table 1 shows the average particle size and shape of the obtained spherical aluminum nitride powder, the ratio of the major axis to the minor axis of the aluminum nitride particles, the content of cationic impurities, and the C-axis lattice constant of the aluminum nitride crystal. Furthermore, using the obtained aluminum nitride powder, a sheet was produced in the same manner as in Example 1, and the thermal conductivity was measured. The results are shown in Table 1 together.

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Abstract

To provide a method for manufacturing a spherical aluminum nitride powder that has high thermal conductivity, excellent filling performance, and is useful as a filler for a heat-dissipation material. [Solution] A spherical aluminum nitride powder is manufactured as follows: a mixture of 100 parts of aluminum oxide or hydroxide, 0.5 to 30 parts of a rare-earth metal compound, and 38 to 46 parts of carbon powder, by mass, is reductively nitrided for at least two hours at a temperature of 1620-1900 DEG C.

Description

technical field [0001] The present invention relates to a method for producing spherical aluminum nitride powder suitable as a filler for a heat-dissipating material to be filled into resins, greases, adhesives, paints, etc. to improve heat dissipation. Background technique [0002] Since aluminum nitride is excellent in electrical insulation and has high thermal conductivity, materials such as resins, greases, adhesives, and paints filled with its sintered body or powder are expected as heat sink materials with high thermal conductivity. [0003] In order to increase the thermal conductivity of the above-mentioned heat dissipation material, it is important to highly fill the resin as a matrix with a filler having high thermal conductivity. Therefore, a spherical aluminum nitride powder having a particle diameter of several μm to several tens of μm is strongly desired. [0004] Regarding the method for producing aluminum nitride powder, generally known are: the alumina redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/072
CPCC01B21/0726C01P2004/54C01P2006/32C01B21/072C01P2004/32C01P2002/77C01P2004/03C01P2002/54C01F17/0025C01P2006/80C01P2004/61C04B35/581C04B35/6265C04B35/6268C04B2235/3224C04B2235/3225C04B2235/422C04B2235/528C04B2235/5296C04B2235/5409C04B2235/5436C04B2235/725C04B2235/726C04B2235/761C01F17/34Y10T428/2982
Inventor 宗冈孝俊渡边一孝
Owner TOKUYAMA CORP
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