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10B boron carbide and preparation method thereof

A technology of boron carbide and boric acid powder, which is applied in the field of 10B boron carbide and its preparation, can solve the problems of increasing production cost and wasting raw materials, and achieves the effects of low secondary ray energy, avoiding oxidation loss and capturing a wide spectrum of energy.

Active Publication Date: 2011-07-06
DALIAN BORONTEN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

in the mix 10 B boric acid powder and carbon powder use absolute ethanol as the medium, which increases the production cost; one-time calcination at a temperature of 600-800 ° C causes boron-containing materials to fly, carbon powder is oxidized, and raw materials are wasted

Method used

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  • 10B boron carbide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) First by mass parts 10 B abundance is 99% (at.) 75 parts of boric acid powder and 25 parts of graphite powder are mixed in mixer for 5 hours, obtain mixed powder, wherein boric acid powder purity is 99.9wt%, median diameter d 50 50 <4μm;

[0025] (2) Compress the mixed powder into tablet granules with a diameter of 20mm and a thickness of 10mm in a tablet press;

[0026] (3) Put the mixed powder pellets into a ceramic bowl, roast and dehydrate in stages in a muffle furnace, and roast at 100°C for 60 minutes to dehydrate boric acid into metaboric acid and tetraboric acid, and then Roasting at 700°C for 60 minutes to completely dehydrate metaboric acid and tetraboric acid into boric anhydride (B 2 o 3 );

[0027] (4) After the dehydrated mixed powder tableting particles undergo carbonization reaction at a temperature of 2100 ° C, keep warm for 60 minutes, wherein the carbonization reaction is to put the mixed powder tableting particles into an induction heating fu...

Embodiment 2

[0031] (1) First by mass parts 10 B abundance is 60% (at.) boric acid powder 80 parts and graphite powder 20 parts are mixed in mixer for 8 hours, obtain mixed powder, wherein boric acid powder purity is 99.9wt%, median particle size d 50 50 <4μm;

[0032] (2) Compress the mixed powder into tablet granules with a diameter of 20mm and a thickness of 10mm in a tablet press;

[0033] (3) Put the mixed powder pellets into a ceramic bowl, roast and dehydrate in stages in a muffle furnace, and roast at 150°C for 60 minutes to dehydrate boric acid into metaboric acid and tetraboric acid, then Roasting at 600°C for 60 minutes to completely dehydrate metaboric acid and tetraboric acid into boric anhydride (B 2 o 3 );

[0034] (4) After making the dehydrated mixed powder tablet granules undergo a carbonization reaction at a temperature of 1855° C., keep the heat for 60 minutes, wherein the carbonization reaction is to put the mixed powder tablet granules into a 20 kw graphite resist...

Embodiment 3

[0038] (1) First by mass parts10 B abundance is 25% (at.) boric acid powder 83 parts and graphite powder 17 parts are mixed in mixer for 6 hours, obtain mixed powder, wherein boric acid powder purity is 99.9wt%, median particle size d 50 50 <4μm;

[0039] (2) Compress the mixed powder into tablet granules with a diameter of 20mm and a thickness of 10mm in a tablet press;

[0040] (3) Put the mixed powder tablet granules into a ceramic bowl, roast and dehydrate in stages in a muffle furnace, and roast at 200°C for 60 minutes to dehydrate boric acid into metaboric acid and tetraboric acid, and then Roasting at 500°C for 60 minutes to completely dehydrate metaboric acid and tetraboric acid into boric anhydride (B 2 o 3 );

[0041] (4) Make the dehydrated mixed powder pellets undergo a carbonization reaction at a temperature of 2000°C, wherein the carbonization reaction is to put the mixed powder pellets into a 60 kvA electric arc furnace, and heat and carbonize in the air ; ...

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Abstract

The invention relates to the technical field of protection and control materials, and in particular relates to 10B boron carbide and a preparation method thereof. In the 10B boron carbide, the content of B4C is 97wt%, the content of B2O3 is 0.3wt%, the content of free boron is 1.3wt%, and 10B abundance is 25-99% (at.). The preparation method comprises the following steps: mixing 75-85 parts of boric acid powder with 25-99% (at.) of 10B abundance and 25-35 parts of high-purity graphite powder; pressing the mixed material into tablet particles with the diameter of 20mm and thickness of 10mm; respectively carrying out sectional roasting and dehydrating on the tablet particles at the temperature of 100-200 DEG C and 500-700 DEG C; and putting the roasted tablet particles in an induction heating furnace, or a graphite heating furnace or an arc furnace for carbonization at the carbonization temperature of 1855-2100 DEG C, thus the 10B boron carbide product meeting the quality requirement is obtained.

Description

technical field [0001] The invention relates to the technical field of protection and control materials, in particular to a 10 B boron carbide and its preparation method. Background technique [0002] 10 B in boron carbide 10 B has the characteristics of high neutron capture cross-section, wide capture energy spectrum, no radioactive isotopes after absorbing neutrons, and low secondary ray energy. It has become the most important material of choice for neutron absorption in nuclear reactors. and 10 B boron carbide has superior high temperature properties, excellent wear resistance, fairly good chemical inertness and special radiation properties. Its products can be used as shielding materials and control materials in nuclear reactors. [0003] In the patent application number 200910231496.2, the title of the invention is "a kind of rich 10 B boron carbide powder and its preparation method" in the application for the invention patent, the 10 B boric acid powder and car...

Claims

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Application Information

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IPC IPC(8): C01B31/36
Inventor 吴旭光曹宝胜韩晓辉
Owner DALIAN BORONTEN SCI & TECH
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