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Hexagonal boron nitride as well as preparation method and application thereof

A technology of hexagonal boron nitride and nitrogen compounds, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of increased system viscosity, low thermal conductivity, insufficient lubricity, etc.

Pending Publication Date: 2021-03-19
山东晶亿新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The h-BN prepared by these methods mostly has a scaly structure with a small crystal size and low crystallinity. When used as a thermally conductive filler, it mainly exists in the form of agglomerates due to the small crystal size. Due to the degree of lubricity between the agglomerated particles Insufficient, resulting in an increase in the viscosity of the system, which greatly limits the addition of h-BN as a thermally conductive material. At the same time, there will be a large number of voids in the aggregate, forming a large specific surface area, adsorbing free polymers, and reducing the thermal conductivity of the system; due to the scale structure , intensifies the anisotropy of h-BN, has higher thermal conductivity in the direction perpendicular to the C-axis, and has a lower thermal conductivity in the direction parallel to the C-axis, which in turn leads to when used as a thermally conductive filler, Its real thermal conductivity is lower than its theoretical thermal conductivity; moreover, the h-BN powder with poor crystallinity is unstable and easily decomposes in humid air to generate ammonia and boron oxide. The presence of boron oxide impurities will not only It affects the freezing point of the system, and at the same time blocks the link between boron nitride, making it difficult to obtain high heat load when h-BN is used as a thermally conductive filler, and high heat load is a necessary condition for improving thermal conductivity

Method used

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  • Hexagonal boron nitride as well as preparation method and application thereof
  • Hexagonal boron nitride as well as preparation method and application thereof
  • Hexagonal boron nitride as well as preparation method and application thereof

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preparation example Construction

[0029] The invention provides a kind of preparation method of hexagonal boron nitride, comprises the following steps:

[0030] In a water vapor environment, the nitrogen-containing compound, the boron-containing compound and the crystallization aid are mixed and reacted to obtain a nitrogen-boron intermediate product containing the crystallization aid;

[0031] In a non-oxidizing atmosphere, sintering the nitrogen-boron intermediate product containing a crystallization aid to obtain the hexagonal boron nitride;

[0032] The crystallization aids include alkali metal borates, alkali metal carbonates, alkali metal nitrates, alkali metal sulfates, alkaline earth metal borates, alkaline earth metal carbonates, alkaline earth metal nitrates and alkaline earth metal sulfates. one or more of .

[0033] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0034] In the invention...

Embodiment 1

[0062] Add 55kg of metaboric acid, 45kg of ammeline and 5kg of calcium borate into the super mixer, feed flowing water vapor, keep the humidity in the tank at 80%, the temperature at 85°C, stir at 400rpm for 4 hours, and drying at 120° C. for 12 hours to obtain the nitrogen-boron intermediate product containing a crystallization aid;

[0063] The nitrogen-boron intermediate product was placed in an intermediate frequency induction tube furnace, and nitrogen gas (flow rate: 5 L / min) was introduced to carry out sintering (the heating rate was 10°C / min, the sintering temperature was 1900°C, and the temperature was kept for 8h) , cooled with the furnace to obtain a sintered block;

[0064] The sintered block is broken (rotating speed is 600rpm, the time is 20min) to 30cm 3 Finally, pulverize (rotating speed is 6000rpm, time is 20min) in the IKN high-shear pulverizer, obtains the powder (average particle diameter is 25 μm) that quality is 17kg;

[0065] The 17kg of powder was was...

Embodiment 2

[0068] Add 55kg of orthoboric acid, 45kg of melamine and 5kg of potassium borate into the super mixer, feed flowing water vapor, keep the humidity in the tank at 80%, the temperature at 85°C, stir at 400rpm for 4h, and dry at 120°C for 6h , obtaining the nitrogen-boron intermediate product containing a crystallization aid;

[0069] The nitrogen-boron intermediate product was placed in an intermediate frequency induction tube furnace, and nitrogen gas (flow rate: 5 L / min) was introduced to carry out sintering (the heating rate was 10°C / min, the sintering temperature was 1900°C, and the temperature was kept for 8h) , cooled with the furnace to obtain a sintered block;

[0070] The sintered block is broken (rotating speed is 600rpm, the time is 20min) to 30cm 3 Finally, pulverize (rotating speed is 6000rpm, time is 20min) in the IKN high-shear pulverizer, obtains the powder (mean particle diameter is 50 μm) that quality is 16kg;

[0071] The 16kg of powder was washed with 500kg...

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Abstract

The invention relates to the technical field of hexagonal boron nitride, in particular to hexagonal boron nitride and a preparation method and application thereof. The preparation method of hexagonalboron nitride provided by the invention comprises the following steps: mixing a nitrogen-containing compound, a boron-containing compound and a crystallization aid in a water vapor environment to react to generate a nitrogen-boron intermediate product containing the crystallization aid, and sintering the nitrogen-boron intermediate product containing the crystallization aid in a non-oxidizing atmosphere to obtain the hexagonal boron nitride. According to the invention, the crystallization auxiliary agent is added to play a role of a boron nitride hexagonal network interlayer order promoter ina non-oxidizing atmosphere. Results of embodiments and application cases show that the hexagonal boron nitride prepared by the method is complete in crystal form, large in size and high in crystallinity, and has a lamellar structure, and the purity of the hexagonal boron nitride is greater than 99.5%; when thehexagonal boron nitride is used as a heat-conducting filler, the highest filling rate is62%, and the highest heat conductivity is 3.4 W / mK.

Description

technical field [0001] The invention relates to the technical field of hexagonal boron nitride, in particular to a hexagonal boron nitride and its preparation method and application. Background technique [0002] Hexagonal boron nitride (h-BN) is a compound similar to graphite structure formed by boron nitride hexagonal network lamination, which has excellent thermal conductivity, electrical insulation, heat resistance, corrosion resistance and chemical stability and lubricity. In the powder state, h-BN can be used as solid lubricant, heat-resistant mold release agent and raw material of cubic boron nitride, etc. The ceramic body after h-BN hot pressing and sintering can also be used as crucible, electrical insulating material and various electronic Materials. [0003] As we all know, since the component parts of the integrated circuit board generate heat during operation and form a corresponding heat source, a heat sink must be equipped to remove the heat generated by the...

Claims

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Application Information

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IPC IPC(8): C01B21/064C08L81/02C08K3/38
CPCC01B21/064C08K3/38C01P2004/22C01P2004/03C01P2002/72C08K2003/385
Inventor 侯广生褚宗富黄小红
Owner 山东晶亿新材料有限公司
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