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Method for preparing boron carbide by utilizing gas-solid method

A boron carbide and gas-solid technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve problems such as difficult sintering density, uneven shape, large particle size, etc., and achieve high particle size distribution uniformity , The effect of excellent shape characteristics

Active Publication Date: 2018-10-19
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large particle size and uneven shape of commercially available boron carbide powder, it is difficult to sinter and compact

Method used

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  • Method for preparing boron carbide by utilizing gas-solid method
  • Method for preparing boron carbide by utilizing gas-solid method
  • Method for preparing boron carbide by utilizing gas-solid method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] follow B 2 o 3 The mass ratio of / residual carbon is 40:1 Weigh boron oxide and graphene, boron oxide is placed in the first crucible 130, the graphite film 150 that has through hole is fixed on the first crucible 130, graphene is avoided Place the through hole on the graphite film 150, then place the second crucible 140 upside down on the first crucible 130, and use the wall edges of the first crucible 130 and the second crucible 140 to fix the graphite film 150 on the first crucible 130 and the second crucible Between 140.

[0047] Vacuumize the vacuum atmosphere furnace 110, and then in a vacuum environment, turn on the vacuum atmosphere furnace 110 to make the graphite heating element 120 generate heat, and make the temperature in the vacuum atmosphere furnace 110 reach 1400°C at a heating rate of 10°C / min, and keep it warm for 6h Then cool down to room temperature to obtain boron carbide powder.

Embodiment 2

[0049] follow B 2 o 3 The mass ratio of / residual carbon is 20:1 Weigh boron oxide and phenolic resin, boron oxide is placed in the first crucible 130, the graphite film 150 with through hole is fixed on the first crucible 130, phenolic resin avoids Place the through hole on the graphite film 150, then place the second crucible 140 upside down on the first crucible 130, and use the wall edges of the first crucible 130 and the second crucible 140 to fix the graphite film 150 on the first crucible 130 and the second crucible Between 140.

[0050] Vacuumize the vacuum atmosphere furnace 110, and then in a vacuum environment, turn on the vacuum atmosphere furnace 110 to make the graphite heating element 120 generate heat, and make the temperature in the vacuum atmosphere furnace 110 reach 1500°C at a heating rate of 20°C / min, and keep it warm for 2 hours Then cool down to room temperature to obtain boron carbide powder.

Embodiment 3

[0052] follow B 2 o 3 The mass ratio of carbon / residual carbon is 60:1 Weighing boric acid and glucose, boric acid is placed in the first crucible 130, the graphite film 150 with through hole is fixed on the first crucible 130, glucose avoids through hole and is placed in Then place the second crucible 140 upside down on the first crucible 130, and use the wall edges of the first crucible 130 and the second crucible 140 to fix the graphite film 150 between the first crucible 130 and the second crucible 140.

[0053] Vacuumize the vacuum atmosphere furnace 110, and then in a vacuum environment, turn on the vacuum atmosphere furnace 110 to make the graphite heating element 120 generate heat, and make the temperature in the vacuum atmosphere furnace 110 reach 1500°C at a heating rate of 20°C / min, and keep it warm for 4h Then cool down to room temperature to obtain boron carbide powder.

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Abstract

A method for preparing boron carbide by utilizing a gas-solid method comprises the following steps: separately placing a boron source and a carbon source, and heating to 1300 to 2000 DEG C under the protection of a vacuum or inert atmosphere, thus generating boron oxide steam by the boron source; enabling the boron oxide steam to react with carbon provided by the carbon source. The method disclosed by the invention is capable of preparing the boron carbide in higher granularity and distribution uniformity.

Description

technical field [0001] The invention relates to the technical field of ceramic material preparation, and in particular to a method for preparing boron carbide by a gas-solid method. Background technique [0002] As an ultra-high temperature ceramic material with extremely high hardness, boron carbide (B 4 C) It is widely used in the fields of neutron absorption protection, wear-resistant materials and lightweight bulletproof armor materials. The commercially available boron carbide powder is difficult to sinter densely due to its large particle size and uneven shape. [0003] Ultrafine boron carbide powder has higher surface energy, therefore, using ultrafine boron carbide powder as raw material, sintered and dense boron carbide products can be obtained at a lower temperature. At the same time, the smaller the particle size, the higher the grain boundary ratio of the ceramic material, which increases the crack propagation path during fracture, which is beneficial to the im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/991
CPCC01B32/991C01P2002/72C01P2004/03C01P2004/62C01P2004/64
Inventor 魏红康邓翔宇李辰冉赵林谢志鹏汪长安吴凡
Owner JINGDEZHEN CERAMIC INSTITUTE
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