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Preparation method for 10B-enriched boron carbide nanopowder

A boron carbide powder and nano technology, which is applied in the field of preparation of 10B-rich boron carbide nano powder, can solve the problems of increased production cost, low production capacity, large average particle size, etc., and achieves high neutron absorption and powder particle size. Small, low sintering temperature effect

Inactive Publication Date: 2014-12-10
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This preparation is rich in 10 The method of boron carbide powder has the advantages of simple equipment structure, small footprint, and mature and stable process operation, but this method also has relatively large defects, including high energy consumption, low production capacity, and serious damage to the furnace body at high temperatures , especially the average particle size of the synthesized original powder is large (20-40μm), as a raw material for sintered boron carbide, a large number of crushing processes are required, which greatly increases the production cost

Method used

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  • Preparation method for 10B-enriched boron carbide nanopowder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Will 10 B richness of 65% rich 10 B boric acid powder (purity > 98%, d 50 <300μm, produced by Dalian Borntan Technology Co., Ltd.) 50g, mixed with 60ml of glycerol, ball milled and mixed, put into an alumina crucible, heated to 120°C in air, and kept for 2 hours to form a mixed liquid with uniform composition.

[0028] (2) The above liquid was put into a muffle furnace and heated in the air at a heating temperature of 450°C, a holding time of 0.5 hours, and a heating rate of 5°C / min.

[0029] (3) Grinding the product obtained after heating with an alumina mortar and passing through a 100-mesh sieve to form particles with a particle size of less than 1 mm.

[0030] (4) Press the above granules into cubes, the pressure is 20Mp, and the holding time is 3 minutes.

[0031] (5) Put the above-mentioned block into a graphite crucible, seal it, put it into a vacuum furnace, perform high-temperature treatment on it in a vacuum or argon atmosphere, raise the temperature to...

Embodiment 2

[0033] (1) Will 10 B richness of 68% rich 10 B boric acid powder (purity > 98%, d 50 <300μm, produced by Dalian Borntan Technology Co., Ltd.) 50g, mixed with 30ml glycerol, ball milled and mixed, put into an alumina crucible, heated to 150°C in air, and kept for 2 hours to form a mixed liquid with uniform composition.

[0034] (2) Put the above liquid into a muffle furnace and heat it in the air at a heating temperature of 550°C, a holding time of 1 hour, and a heating rate of 5°C / min.

[0035] (3) Grinding the product obtained after heating with an alumina mortar and passing through a 200-mesh sieve to form particles with a particle size of less than 1 mm.

[0036] (4) Press the above granules into cubes, the pressure is 30Mp, and the holding time is 5 minutes.

[0037] (5) Put the above-mentioned block into a graphite crucible, seal it, put it into a vacuum furnace, perform high-temperature treatment on it in a vacuum or argon atmosphere, raise the temperature to 1500°C a...

Embodiment 3

[0039] (1) Will 10 B abundance 90% rich 10 B boric acid powder (purity > 98%, d 50 <300μm, produced by Dalian Borntan Technology Co., Ltd.) 50g, mixed with 40ml of glycerol, ball milled and mixed, put into an alumina crucible, heated to 180°C in air, and kept for 2 hours to form a mixed liquid with uniform composition.

[0040] (2) The above liquid is put into a muffle furnace and heated in air at a heating temperature of 650°C, a holding time of 3 hours, and a heating rate of 5°C / min.

[0041] (3) Grinding the product obtained after heating with an alumina mortar and passing through a 100-mesh sieve to form particles with a particle size of less than 1 mm.

[0042] (4) Press the above granules into cubes, the pressure is 30Mp, and the holding time is 5 minutes.

[0043](5) Put the above-mentioned block into a graphite crucible, seal it, put it into a vacuum furnace, perform high-temperature treatment on it in a vacuum or argon atmosphere, raise the temperature to 1600°C an...

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Abstract

The invention relates to a preparation method for 10B-enriched boron carbide nanopowder. The preparation method for the 10B-enriched boron carbide nanopowder comprises the following steps: mixing boric acid with the 10B abundance of 65 to 90 percent and glycerol according to the molar ratio of the boric acid to the glycerol of (0.5-3):1; performing ball milling; heating and removing crystallization water; performing heat treatment at the temperature of between 450 and 650 DEG C; grinding; briquetting; treating at the high temperature of between 1,300 and 1,600 DEG C; and cooling to prepare the 10B-enriched boron carbide nanopowder. The method is simple in process and low in energy consumption; exogenous impurities are not introduced; the 10B-enriched boron carbide nanopowder is synthesized at relatively low temperature; and the 10B-enriched boron carbide nanopowder has high neutron absorptivity and is an ideal raw material for a control rod, an adjusting rod, an emergency rod, a safety rod and a shielding rod in a nuclear reactor.

Description

technical field [0001] The present invention relates to rich 10 The invention discloses a preparation method of boron carbide nano powder, which belongs to the technical field of new materials. Background technique [0002] In nuclear reactor core components, neutron-absorbing materials (control rods, regulating rods, accident rods, safety rods, shielding rods) are important functional components next to fuel elements, and the development of nuclear power is inseparable from high-performance neutron-absorbing materials . Boron carbide has high neutron absorption cross section, wide absorption energy spectrum, low price, no strong secondary radiation of gamma rays after absorbing neutrons, so the waste is easy to handle, so it is an important neutron absorbing material. According to reports, boron carbide is the only fast neutron absorbing material commonly used in the world. [0003] The neutron absorption capacity of boron carbide mainly depends on the 10 B content. Bo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/36B82Y40/00C01B32/991
Inventor 张玉军龚红宇江雅珍赵玉军焦倩魏汝斌
Owner SHANDONG UNIV
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