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Titanium diboride-titanium nitride nano heterostructure composite ceramic powder and preparation method thereof

A titanium nitride nanometer and heterogeneous structure technology, applied in the field of ceramic material preparation, can solve the problems of high self-propagating reactor design requirements, complicated preparation process, and expensive raw materials, etc., to achieve the inhibition of product grain growth and sintering Agglomeration, simple preparation process, and the effect of improving purity

Inactive Publication Date: 2013-01-30
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The self-propagating synthesis method is a suitable method for the industrial preparation of TiB 2 -TiN composite ceramic powder method, previously reported that the main raw material used is high-purity TiH 2 powder, Ti powder, BN powder and amorphous B powder, generally TiN or TiB 2 As a diluent, the raw materials are first processed by ball milling for 10 hours, then cold-pressed into cylindrical blocks, and finally the composite powder is prepared by igniting the top tungsten wire in the self-propagating reaction furnace, and the obtained product is in the form of particles. The raw materials of this method are expensive and the preparation process The process is complex and requires high requirements for the design of self-propagating reactors

Method used

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  • Titanium diboride-titanium nitride nano heterostructure composite ceramic powder and preparation method thereof
  • Titanium diboride-titanium nitride nano heterostructure composite ceramic powder and preparation method thereof
  • Titanium diboride-titanium nitride nano heterostructure composite ceramic powder and preparation method thereof

Examples

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Effect test

Embodiment 1

[0047] A titanium diboride-titanium nitride nano-heterostructure composite ceramic powder is prepared according to the following steps:

[0048] (1) Prepare diboron trioxide (B 2 o 3 ) 22.65g, titanium dioxide (TiO 2 ) 34.26g, magnesium powder (Mg) 31.65g, potassium borohydride (KBH 4 ) 11.75g ​​and ammonium nitrate (NH 4 NO 3 ) 9g is standby as raw material;

[0049] (2) Diboron trioxide (B 2 o 3 ), titanium dioxide (TiO 2 ), magnesium powder (Mg) is poured into the planetary ball mill tank, the ball mill revolves at 500 rpm, rotates at 250 rpm, and the ball milling time is 2 hours to obtain the ball mill; the ball mill and potassium borohydride (KBH 4 ) and ammonium nitrate (NH 4 NO 3 ) for 10 minutes, then pour it into a steel reaction tank for compaction, then put the reaction tank into an atmosphere furnace with a temperature of 700 ° C and high-purity nitrogen pressure protection, and the air pressure is 0.2Mpa. to obtain a crude product;

[0050] (3) Add the...

Embodiment 2

[0058] A titanium diboride-titanium nitride nano-heterostructure composite ceramic powder is prepared according to the following steps:

[0059] (1) Prepare diboron trioxide (B 2 o 3 ) 12.35g, titanium dioxide (TiO 2 ) 34.34g, magnesium powder (Mg) 4.15g, potassium borohydride (KBH 4 ) 29.15g and ammonium nitrate (NH 4 NO 3 ) 13g is standby as raw material;

[0060] (2) Diboron trioxide (B 2 o 3 ), titanium dioxide (TiO 2 ), magnesium powder (Mg) is poured into the planetary ball mill tank, the ball mill revolves at 400 rpm, rotates at 200 rpm, and the ball milling time is 1 hour to obtain the ball mill; the ball mill and potassium borohydride (KBH 4 ) and ammonium nitrate (NH 4 NO 3 ) were mixed and ground for 10 minutes, then poured into a 250ml steel reaction tank for compaction, and then the reaction tank was put into an atmosphere furnace with a temperature of 800°C and 0.5Mpa high-purity nitrogen pressure protection, kept for 10 minutes, and was cooled to room ...

Embodiment 3

[0064] A titanium diboride-titanium nitride nano-heterostructure composite ceramic powder is prepared according to the following steps:

[0065] (1) Prepare diboron trioxide (B 2 o 3 ) 20.65g, titanium dioxide (TiO 2 ) 34.40g, magnesium powder (Mg) 20.95g, potassium borohydride (KBH 4 ) 17.46g and ammonium nitrate (NH 4 NO 3 ) 11g is standby as raw material;

[0066] (2) Diboron trioxide (B 2 o 3 ), titanium dioxide (TiO 2 ), magnesium powder (Mg) is poured into the planetary ball mill tank, the ball mill revolves at 500 rpm, rotates at 250 rpm, and the ball milling time is 1.5 hours to obtain ball abrasives; ball abrasives and NH 4 NO 3 and KBH 4 Mix and grind for 10 minutes, then pour it into a 250ml steel reaction tank for compaction, then put the reaction tank into an atmosphere furnace with a temperature of 700°C and 0.8Mpa high-purity nitrogen pressure protection, keep it warm for 15 minutes, and cool to room temperature to obtain crude product;

[0067] (3) ...

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Abstract

The invention relates to a titanium diboride-titanium nitride nano heterostructure composite ceramic powder which is prepared by the following steps: (1) preparing boron trioxide, titanium dioxide, magnesium powder, potassium borohydride and ammonium nitrate as raw materials for later use; (2) mixing the boron trioxide, titanium dioxide and magnesium powder, carrying out ball milling, evenly grinding with the potassium borohydride and ammonium nitrate, pouring the mixture into a reaction tank, putting the reaction tank into an atmosphere furnace with 700-850 DEG C and nitrogen protective atmosphere, and keeping the temperature for 8-15 to obtain a crude product; and (3) purifying and drying the obtained crude product, thereby obtaining the titanium diboride-titanium nitride nano heterostructure composite ceramic powder. The invention has the advantages of low cost of raw materials, simple and effective technical process, low energy consumption and low requirements for the reactor, and is suitable for industrial production. The surface of the obtained product is dendriform heterogenous nanocrystals.

Description

technical field [0001] The invention relates to a titanium diboride-titanium nitride nano-heterostructure composite ceramic powder and a preparation method thereof, which are mainly used in the field of preparation of ceramic materials. Background technique [0002] Titanium boride (TiB 2 ) is the most stable compound of boron and titanium elements. It is a C32 type structure, combined in the form of covalent bonds, and belongs to the metalloid compound of the hexagonal crystal system. Its melting point is as high as 3225°C, and its hardness can reach HV30-40GP. TiB 2 It also has good wear resistance, excellent chemical corrosion resistance, high thermal conductivity and electrical conductivity, etc. TiB 2 Ceramics are suitable for the preparation of refractory materials, finishing tools, conductive evaporation boats, extrusion dies, sandblasting nozzles, bulb casings, sealing components, etc., especially in cemented carbide tools and special ceramic container materials....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/626
Inventor 王为民王吉林李自力谷云乐傅正义
Owner WUHAN UNIV OF TECH