Boron-carbide-containing graphite absorber ball and preparation process thereof

A preparation process, boron carbide technology, applied in nuclear engineering, manufacturing reactors, nuclear reaction control, etc., can solve the problems of poor wear resistance and moisture absorption resistance, high porosity, poor moisture absorption, etc., to achieve low labor cost consumption, High degree of automation, the effect of increasing strength

Inactive Publication Date: 2011-10-12
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
View PDF8 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fatal disadvantage of general graphite materials is that graphite spheres with a relatively high degree of graphitization have high wear and poor hygroscopicity due to high porosity, which cannot meet the requirements of the shutdown system.
However, the coating methods such as impregnated resin cannot meet the requirements of high temperature resistance and wear resistance at the same time.
The surface of ordinary graphite balls is generally porous, and the open porosity is usually more than 10%, including the preparation process of graphite balls described in the publication number "101290814" and the name "A Method for Preparing Graphite Absorbing Balls Containing Boron Carbide" In the middle, the surface of the material is not specially treated, and the wear resistance and moisture resistance of the material are poor at this time.
The existing surface treatment of graphite balls is generally liquid-phase impregnation, which requires subsequent curing and carbonization, and the resulting surface coating is not dense and has low performance

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
  • Boron-carbide-containing graphite absorber ball and preparation process thereof
  • Boron-carbide-containing graphite absorber ball and preparation process thereof
  • Boron-carbide-containing graphite absorber ball and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Such as figure 1 The main part shown is a graphite sphere composed of 5% boron carbide and 95% graphite component, with a diameter of 5mm, and the coating part is a carbon coating prepared by chemical vapor deposition process, and its thickness is 0.1um.

[0066] Preparation steps: (1) mix according to the mass ratio of graphite powder: boron carbide powder: coke powder: phenolic resin powder is 50:5:30:30, add alcohol to dissolve, and stir for 5h; (2) mix the material Carry out granulation and dry, obtain the granulated powder of uniform particle size, the diameter of granulated powder is 5um; (3) granulated powder is packed into spherical metal mould, adopts automatic packing continuous press to press, and pressing rate is 5um. pieces / min; the pressing pressure is 30kN, and the absorbing ball diameter of the pressed boron carbide absorbing ball blank is 6mm; (4) put the pressed graphite ball blank into the curing tank and heat up at a rate of 0.1°C / min to 150°C, keep...

Embodiment 2

[0068] Such as figure 1 The main part shown is a graphite sphere composed of 50% boron carbide and 50% graphite component, with a diameter of 15mm, and the coating part is a carbon coating prepared by a chemical vapor deposition process, and its thickness is 100um.

[0069] Preparation steps: (1) mix according to the mass ratio of graphite powder: boron carbide powder: coke powder: phenolic resin powder is 30:50:10:20, add alcohol to dissolve, and stir for 20h; (2) mix the material Carry out granulation and dry, obtain the granulated powder of uniform particle size, the diameter of granulated powder is 50um; (3) granulated powder is packed into spherical metal mould, adopts automatic packing continuous type press to press, and pressing rate is 30 um; pieces / min; the pressure of pressing is 100kN, and the diameter of the absorbing ball of the pressed boron carbide absorbing ball blank is 16mm; (4) put the pressed graphite ball blank into the curing tank and heat up at a rate of...

Embodiment 3

[0071] Such as figure 1 The main part shown is a graphite sphere composed of 25% boron carbide and 75% graphite component, with a diameter of 6mm. The coating part is a carbon coating prepared by chemical vapor deposition process, and its thickness is 10um.

[0072] Preparation steps: (1) mix graphite powder: boron carbide powder: coke powder: phenolic resin powder in a ratio of 50:25:20:10 by mass, add alcohol to dissolve, and stir for 10 hours; (2) mix the mixed material Carry out granulation and dry, obtain the granulated powder of uniform particle size, the diameter of granulated powder is 10um; (3) granulated powder is packed into spherical metal mould, adopts automatic packing continuous press to press, and pressing rate is 10 pieces / min; the pressing pressure is 60kN, and the absorbing ball diameter of the pressed boron carbide absorbing ball blank is 7mm; (4) put the pressed graphite ball blank into the curing tank and heat up at a rate of 0.5°C / min to 180°C, keep war...

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

PropertyMeasurementUnit
diameteraaaaaaaaaa
diameteraaaaaaaaaa
diameteraaaaaaaaaa
Login to view more

Abstract

The invention provides a boron-carbide-containing graphite absorber ball and a preparation process thereof. The boron-carbide-containing graphite absorber ball consists of a main structure and a carbon coating attached to the surface of the main structure, wherein the main structure is boron-carbide-containing graphite which comprises the flowing components in percentage by mass: 5-50% of boron carbide and 50-95% of graphite or carbon. Coke powder is added to the formula of the boron-carbide-containing graphite absorber ball, therefore the strength of the product is improved. In the press forming process of the boron-carbide-containing graphite absorber ball, a continuous press is used for pressing and forming a ball-shaped product directly, equipment is simple, the degree of automation is high, and labor cost is low; in addition, since a coating is attached to the surface of the boron-carbide-containing graphite absorber ball disclosed by the invention, the surface porosity is reduced by more than 50%; since no coating is attached to surface of the traditional common boron-carbide-containing graphite absorber ball, the surface porosity is higher. The coating of the boron-carbide-containing graphite absorber ball provided by the invention is prepared by a chemical vapor deposition technology, has good combinability with the main structure and high carbon element content being more than 99.99999% and almost does not contain other impurity elements; the anti-moisture absorption property of the boron-carbide-containing graphite absorber ball provided by the invention is improved about 10-100 times higher than that of the traditional common boron-carbide-containing graphite absorber ball; and the wear resistance of the boron-carbide-containing graphite absorber ball provided by the invention is improved by about 2-10 times.

Description

technical field [0001] The invention relates to a boron carbide-containing graphite absorbing ball for neutron absorption and a preparation process thereof, belonging to the technical field of high-temperature gas-cooled reactor nuclear power technology, and the invention is particularly suitable for shutdown systems of high-temperature gas-cooled reactor nuclear power plants. Background technique [0002] At present, the high-temperature gas-cooled reactor is internationally recognized as one of the preferred reactor types for the fourth-generation nuclear reactors. It has the characteristics of miniaturization, high safety, and high power generation efficiency. It has been built as a demonstration project in China and has become the world's first high-temperature reactor. Air-cooled stack. In addition to the control rod shutdown system, the reactor also has a second shutdown system, that is, the graphite ball shutdown system. This system uses boron carbide graphite balls t...

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): G21C9/027G21C7/107G21C7/24G21C21/00G21C21/18
CPCY02E30/30
Inventor 姜召阳林旭平杨村林黄志勇敖明韩钢韩渤涛唐正华
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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