Method for preparing boron carbide powder by adopting organic carbon source

A technology of boron carbide powder and organic carbon, which is applied in the field of preparing boron carbide powder, can solve the problems of high cost of sintering densification, low mechanical properties, low fracture toughness, etc., and achieve full reaction, high performance, and reduced dosage Effect

Active Publication Date: 2021-07-23
JINGDEZHEN CERAMIC INSTITUTE
View PDF13 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004](1) High cost of sintering densification
[0005] (2) The mechanical properties are not high, especially the fracture toughness is low (KIC~2.2MPa·m1 / 2)
However, when phenolic resin is calcined at high temperature, it will produce sheet-like carbon, which will still cause the reaction to be out of sync in time.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing boron carbide powder by adopting organic carbon source
  • Method for preparing boron carbide powder by adopting organic carbon source
  • Method for preparing boron carbide powder by adopting organic carbon source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] as per figure 1 The shown flow process adopts the method for preparing boron carbide powder from an organic carbon source, comprising the following steps:

[0039] (1) In two containers, dissolve zinc nitrate hexahydrate and dimethylimidazole in solvent methanol respectively; add magnets to each container, use a magnetic stirrer with heating function, and heat the solutions to 25°C respectively, and continue Magnetic stirring for 1h;

[0040] The molar ratio of zinc nitrate hexahydrate, dimethylimidazole and methanol is 1:2.36:727.

[0041] (2) Pour the solution of zinc nitrate hexahydrate into the dimethylimidazole solution, mix and let stand for 3h;

[0042] (3) Remove the supernatant of the reactant, and obtain the white precipitate of ZIF-8 by centrifugal separation, the centrifugation parameters are 10000rpm, 5min; the white precipitate is washed with methanol, and the methanol is washed three times, and the process of each time is: in the white precipitate Meth...

Embodiment 2

[0049] as per figure 1 The shown flow process adopts the method for preparing boron carbide powder from an organic carbon source, comprising the following steps:

[0050] (1) In two containers, respectively dissolve zinc nitrate hexahydrate and dimethylimidazole in solvent methanol; add magnets to each container, use a magnetic stirrer with a heating function, and heat the solutions to 40°C respectively for continuous Magnetic stirring for 1h;

[0051] The molar ratio of zinc nitrate hexahydrate, dimethylimidazole and methanol is 1:3.36:727.

[0052] (2) Pour the solution of zinc nitrate hexahydrate into the dimethylimidazole solution, mix and let stand for 10h;

[0053] (3) Remove the supernatant of the reactant, and obtain the white precipitate of ZIF-8 by centrifugal separation, the centrifugation parameters are 10000rpm, 5min; the white precipitate is washed with methanol, and the methanol is washed three times, and the process of each time is: in the white precipitate ...

Embodiment 3

[0060] as per figure 1 The shown flow process adopts the method for preparing boron carbide powder from an organic carbon source, comprising the following steps:

[0061] (1) In two containers, respectively dissolve zinc nitrate hexahydrate and dimethylimidazole in solvent methanol; add magnets to each container, use a magnetic stirrer with heating function, and heat the solutions to 50°C respectively for Magnetic stirring for 1.3h;

[0062] The molar ratio of zinc nitrate hexahydrate, dimethylimidazole and methanol is 1:4.48:727.

[0063] (2) Pour the solution of zinc nitrate hexahydrate into the dimethylimidazole solution, mix and let stand for 15h;

[0064] (3) Remove the supernatant of the reactant, and obtain the white precipitate of ZIF-8 by centrifugal separation, the centrifugation parameters are 10000rpm, 5min; the white precipitate is washed with methanol, and the methanol is washed three times, and the process of each time is: in the white precipitate Methanol wa...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for preparing boron carbide powder by adopting an organic carbon source. The method comprises the following steps: respectively dissolving zinc nitrate hexahydrate and dimethylimidazole in a solvent methanol; respectively heating the solutions, and continuously performing magnetic stirring; pouring the zinc nitrate hexahydrate solution into the dimethylimidazole solution, and performing mixing and standing; carrying out centrifugal separation to obtain a ZIF-8 white precipitate, washing the white precipitate with methanol, drying the washed ZIF-8 powder, and performing grinding; performing pyrolysis in an argon atmosphere to obtain nano-porous carbon; dissolving boric acid H3BO3 and nano porous carbon in deionized water, carrying out ultrasonic dispersion, then carrying out rotary evaporation, drying in a drying oven, performing grinding, and performing sieving with a 100-mesh sieve; and performing calcining to obtain boron carbide. According to the preparation method disclosed by the invention, the NPC which does not contain Zn element impurities and can retain uniform particle size and an ordered nanopore structure can be obtained by optimizing a pyrolysis process of the ZIF-8 powder, such as pyrolysis temperature and heat preservation time.

Description

technical field [0001] The invention belongs to the technical field of boron carbide, in particular to a method for preparing boron carbide powder by using an organic carbon source. Background technique [0002] Boron carbide (B 4 C) Ceramics are the hardest (~29.1GPa) materials other than diamond and cubic boron nitride, and have a low density (2.52g / cm 3 ), high elastic modulus, good neutron absorption, and excellent chemical stability and thermal stability, etc., have been obtained in the fields of lightweight bulletproof armor, jet aircraft blade materials, refractory materials, wear-resistant materials and radiation protection materials. widely used. [0003] Although B 4 C ceramics have incomparable performance advantages in many engineering fields, but their application in my country has not yet achieved a substantial breakthrough. This is mainly due to two points: [0004] (1) The cost of sintering and densification is high. [0005] (2) The mechanical properti...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/991
CPCC01B32/991C01P2004/03
Inventor 魏红康李昊展单峰赵瑞钰邓翔宇邱慧娟赵林汪长安谢志鹏
Owner JINGDEZHEN CERAMIC INSTITUTE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap