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Boron nitride powder, method for producing same, boron carbonitride powder, composite material, and heat dissipation member

A boron nitride and powder technology, used in the field of composite materials and heat dissipation components, can solve the problem of low thermal conductivity, and achieve the effects of excellent heat dissipation, excellent thermal conductivity and excellent filling.

Pending Publication Date: 2022-05-17
DENKA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when producing a composite material formed into a sheet by pressing, in many cases, boron nitride particles are oriented in a direction perpendicular to the pressing direction, and the thermal conductivity in the pressing direction becomes low.

Method used

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  • Boron nitride powder, method for producing same, boron carbonitride powder, composite material, and heat dissipation member
  • Boron nitride powder, method for producing same, boron carbonitride powder, composite material, and heat dissipation member
  • Boron nitride powder, method for producing same, boron carbonitride powder, composite material, and heat dissipation member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] [Preparation of hexagonal carbon boron nitride]

[0068] 100 parts by mass of orthoboric acid manufactured by Nippon Denko Co., Ltd. and 35 parts by mass of acetylene black (trade name: HS100) manufactured by Denka Corporation were mixed with a Henschel mixer. The obtained mixture was filled in a graphite crucible, and heated at 2200° C. for 5 hours in an argon atmosphere with an electric arc furnace to obtain block-like boron carbide (B 4 C). The obtained lump was coarsely pulverized with a jaw crusher to obtain a coarse powder. Pass the coarse powder through a ball made of silicon carbide A ball mill is used to further pulverize to obtain pulverized powder. Pulverization by a ball mill was performed at a rotation speed of 20 rpm for 60 minutes. Thereafter, the pulverized powder was classified using a vibrating sieve with a mesh size of 45 μm. The fine powder on the sieve is air-classified with a CLASSIEL classifier to obtain boron carbide powder with a particle ...

Embodiment 2

[0085] Except having changed the calcination temperature into 2050 degreeC, it carried out similarly to Example 1, and obtained the boron nitride powder. With respect to the obtained boron nitride powder, the measurement of the cumulative pore volume and the logarithmic differential pore volume, and the evaluation of the fillability and heat dissipation were carried out in the same manner as in Example 1. The results are shown in Table 1.

Embodiment 3

[0087]Boron nitride powder was obtained in the same manner as in Example 1, except that the pulverization time of boron carbonitride was changed to 0.5 hours to prepare a pulverized product having an average particle diameter of 40 μm. It should be noted that the boron nitride powder was obtained by passing through a vibrating sieve with a mesh size of 150 μm. With respect to the obtained boron nitride powder, the measurement of the cumulative pore volume and the logarithmic differential pore volume, and the evaluation of the fillability and heat dissipation were carried out in the same manner as in Example 1. The results are shown in Table 1.

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Abstract

One aspect of the present invention provides a boron nitride powder containing aggregated particles formed by aggregating primary particles of boron nitride, the boron nitride powder having a cumulative pore volume of 0.65 mL / g or less at a pore radius of 0.02-1.2 [mu] m as measured by a mercury porometer.

Description

technical field [0001] The invention relates to boron nitride powder and its manufacturing method, boron carbonitride powder, composite material and heat dissipation component. Background technique [0002] Boron nitride has lubricity, high thermal conductivity, and insulation properties, and is widely used in solid lubricants, thermally conductive fillers, insulating fillers, and the like. In recent years, boron nitride as described above has been required to have excellent thermal conductivity due to high performance of electronic devices and the like. [0003] Thermal characteristics of scaly boron nitride generally have anisotropy. That is, it is known that the thermal conductivity in the thickness direction (c-axis direction) is extremely low compared to the thermal conductivity in the in-plane direction (a-b in-plane direction) perpendicular to the thickness direction. For example, the thermal conductivity in the a-axis is 400 W / (m·K), whereas the thermal conductivit...

Claims

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Application Information

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IPC IPC(8): C01B21/064C01B21/082C08K3/38C08L101/00
CPCC01B21/064C08K3/38C01B21/082C08K2003/385C01P2004/61C01P2006/17C01P2006/11C01P2006/14C08L101/00C01B21/0648C09K5/14C08K2201/003C08K2003/382C08L63/00C01P2006/12C01P2006/16C08K2003/085C01P2004/50C01P2006/32C08K2201/001C08K2201/005
Inventor 竹田豪楯冈悠田中孝明
Owner DENKA CO LTD
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