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Method for preparing nano titanium diboride polycrystalline powder

A nano-titanium diboride and crystal powder technology, which is applied in nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve problems affecting the quality of titanium diboride micropowder, high reaction temperature, and coarse particle size

Inactive Publication Date: 2010-11-24
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the process of preparing titanium diboride by magnesia self-propagating reduction method will release a large amount of heat, the reaction temperature is high, and it is difficult to control the product purity, resulting in TiB 2 Many impurity by-products appear in, for example, Mg x B 2 o (x+1) (x=2,3), MgB x (x=4, 6), etc., affect the quality of titanium diboride micropowder, usually the yield and purity of titanium diboride micropowder prepared by magnesia thermal reduction are not high, and the particle size is also coarse, which limits the quality of titanium diboride micropowder. Micropowder application

Method used

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  • Method for preparing nano titanium diboride polycrystalline powder
  • Method for preparing nano titanium diboride polycrystalline powder
  • Method for preparing nano titanium diboride polycrystalline powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Weigh 6.26 g of B 2 o 3 , 11.49 g TiO 2 , 6.99 g Mg, 5.82 g KBH 4 , the ratio is B 2 o 3 :TiO 2 :Mg:KBH 4 =1:1.84:1.12:0.93, corresponding to 60% of the endothermic reaction percentage in Attached Table 1, the B 2 o 3 It is industrial diboron trioxide powder with a particle size of 100-300 mesh; the Mg is industrial magnesium powder with a particle size of 100-300 mesh; the TiO 2 The purity is 99wt.%, and the particle size is 100-300 mesh; the KBH 4 It is analytically pure, with a purity of 95wt.%, and a particle size of 100-300 mesh. The weighed raw materials were put into a high-speed mixer (18000 rpm) and mixed for 6 minutes; the mixture was poured into a steel mould, and a 500-ton tablet press was used to hold the pressure for 40 minutes to obtain a tablet; The compressed tablet was placed in a self-propagating reactor protected by argon and ignited at room temperature. After natural cooling to room temperature, the solid self-propagating reaction product ...

Embodiment 2

[0048] Weigh 7.51 g of B 2 o 3 , 11.49 g TiO 2 , 10.49 g Mg, 3.88 g KBH 4 , the ratio is B 2 o 3 :TiO 2 :Mg:KBH 4 =1:1.53:1.40:0.52, corresponding to 40% of the endothermic reaction percentage in Attached Table 1, the B2 o 3 It is industrial diboron trioxide powder with a particle size of 100-300 mesh; the Mg is industrial magnesium powder with a particle size of 100-300 mesh; the TiO 2 The purity is 99wt.%, and the particle size is 100-300 mesh; the KBH 4 It is analytically pure, with a purity of 95wt.%, and a particle size of 100-300 mesh. The weighed raw materials were put into a high-speed mixer (18000 rpm) and mixed for 8 minutes; the mixture was poured into a steel mould, and a 500-ton tablet press was used to hold the pressure for 80 minutes to obtain a tablet; Put the compressed tablet into a self-propagating reactor protected by argon and ignite it at room temperature. After naturally cooling to room temperature, take out the solid self-propagating reaction p...

Embodiment 3

[0050] Weigh 6.89 g of B 2 o 3 , 11.49 g TiO 2 , 8.74 g Mg, 4.85 g KBH 4 , the ratio is B 2 o 3 :TiO 2 :Mg:KBH 4 =1:1.67:1.27:0.70, corresponding to the heat absorption rate of 50% in Attached Table 1, the B 2 o 3 It is industrial diboron trioxide powder with a particle size of 100-300 mesh; the Mg is industrial magnesium powder with a particle size of 100-300 mesh; the TiO 2 The purity is 99wt.%, and the particle size is 100-300 mesh; the KBH 4 It is analytically pure, with a purity of 95wt.%, and a particle size of 100-300 mesh. Add the weighed raw materials into a high-speed mixer (18000 rpm), mix for 7 minutes, and make it evenly mixed; put the mixture into a reaction tank, place it in an argon-protected muffle furnace after shaking, and immediately The heating rate of the Furnace is 100°C / min, vacuumize and keep warm at 800°C for 15 minutes; take out the self-propagating reaction product, crush it, add excess hydrochloric acid to soak, then heat and stir at 60°C...

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Abstract

The invention relates to a method for preparing nano titanium diboride polycrystalline powder, which comprises the following steps of: mixing raw materials B2O3, TiO2, Mg and KBH4 uniformly, directly performing self-propagating reaction or performing self-propagating reaction after briquetting on the obtained mixed raw materials, and separating and purifying the self-propagating reaction product to obtain the nano titanium diboride polycrystalline powder. The method has the advantages that: (1) the method controls the heat effect of the reaction system, can save energy, reduce the self-propagating reaction temperature and inhibit side reaction and byproduct impurities, and greatly improves the purity of the product; (2) a large amount of gas formed in the reaction process inhibits product grain growth and sintering agglomeration and realizes grain size control of the nano TiB2; and (3) the method has simple reaction process and technique, is easy to control and suitable for industrial production, reduces the preparation cost for preparing the nano titanium diboride polycrystalline powder, and has great utility value.

Description

technical field [0001] The invention relates to the field of preparation of ceramic materials, in particular to a preparation method of nano titanium diboride polycrystalline powder. Background technique [0002] Titanium diboride (TiB 2 ) is the only stable compound of boron and titanium, which are covalently bonded to each other. It has the advantages of high melting point (2790°C), high hardness (Hv=30GPa), strong corrosion resistance, good oxidation resistance, electrical conductivity and thermal conductivity, etc. It is suitable for refractory materials, finishing tools, wire drawing dies, extrusion Compression dies, sandblasting nozzles, bulb casings, sealing components, etc., are more widely used, especially in cemented carbide tools and special ceramic container materials. Titanium diboride is also used as a conductive ceramic material and is one of the main raw materials for vacuum coating conductive evaporation boats. Titanium diboride can form composite materia...

Claims

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Application Information

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IPC IPC(8): C01B35/04B82B3/00
Inventor 谷云乐赵国伟王吉林张来平王为民李婕
Owner WUHAN INSTITUTE OF TECHNOLOGY
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