Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing hollow cobalt-nickel alloy/porous carbon composite wave-absorbing material

A composite wave-absorbing material, cobalt-nickel alloy technology, applied in carbon preparation/purification, magnetic field/electric field shielding, electrical components, etc., can solve the problems of single electromagnetic wave attenuation mechanism, easy oxidation of microwave absorbing materials, complex preparation methods, etc. Achieve multiple electromagnetic wave attenuation mechanisms, excellent lightweight microwave absorption performance, and easy follow-up processing

Active Publication Date: 2021-03-05
NANCHANG HANGKONG UNIVERSITY
View PDF11 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a hollow cobalt-nickel alloy / porous carbon composite absorbing material, which solves the problems of easy oxidation, high density, single electromagnetic wave attenuation mechanism, complex preparation method and equipment requirements of existing alloy microwave absorbing materials. High and costly issues

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 hollow cobalt-nickel alloy/porous carbon composite wave-absorbing material
  • Method for preparing hollow cobalt-nickel alloy/porous carbon composite wave-absorbing material
  • Method for preparing hollow cobalt-nickel alloy/porous carbon composite wave-absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The specific implementation steps of the present invention are as follows:

[0022] Step 1: Dissolve 0.48 g of cobalt chloride hexahydrate, 0.48 g of nickel chloride hexahydrate and 1.0 g of polyvinylpyrrolidone in 36 mL of ethylene glycol under stirring at room temperature. Then, add 4 mL of 80% hydrazine hydrate to the above solution. Finally, the mixed solution was transferred into an autoclave and kept at 180 °C for 6 h. The reaction product was washed three times with deionized water and absolute ethanol, and dried in a vacuum oven at 60°C to obtain a hollow CoNi alloy;

[0023] Step 2: Disperse 0.2 g of the hollow CoNi alloy prepared in Step 1 in a mixed solution of 50 mL of deionized water, 20 mL of absolute ethanol and 1 mL of ammonia water under ultrasonic vibration. Subsequently, 0.2 g of resorcinol and 0.28 mL of 37% formaldehyde were added to the above solution. The reaction was stirred mechanically at room temperature for 24 h. The product was collected...

Embodiment 2

[0026] The difference between this example and Example 1 is that in step 3, the hollow CoNi@phenolic resin prepared in step 2 was heated from room temperature to 700°C for 2 hours under a nitrogen atmosphere and a heating rate of 2°C / min, and then calcined for 2 hours. Naturally cooled to room temperature under atmosphere. Others are the same as in Example 1.

[0027] figure 1 For the X-ray diffraction pattern, CoNi, CoNi@C-600 and CoNi@C-700 have three sharp peaks at 44.4°, 51.7° and 76.3°, corresponding to (111), ( 200) and (220) crystal faces. Each diffraction peak is a single peak, indicating that the sample is not a mixture of elements cobalt and nickel, but exists in the form of an alloy.

[0028] figure 2 For the total spectrogram of the XPS of the CoNi@porous carbon prepared in embodiment 2, from figure 2 It can be seen that CoNi@C-700 contains four elements: C, O, Co, and Ni.

[0029] image 3 The SEM picture of the CoNi@porous carbon prepared in step 3 of Ex...

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 present invention provides a method for preparing a hollow cobalt-nickel alloy / porous carbon composite wave-absorbing material. The method comprises the steps of: using cobalt chloride hexahydrateand nickel chloride hexahydrate as initial raw materials, preparing a hollow CoNi alloy firstly, using the hollow CoNi alloy as a core, forming a phenolic resin shell on the surface of the hollow CoNi alloy through in-situ polymerization of resorcinol and formaldehyde, and carrying out pyrolysis conversion to obtain the hollow cobalt-nickel alloy / porous carbon composite wave-absorbing material. The hollow cobalt-nickel alloy / porous carbon composite wave-absorbing material disclosed by the invention has the advantages of small relative density, strong oxidation resistance, strong acid and alkali resistance, excellent microwave absorption performance and the like, simple production process, low production cost, strong practical value and suitability for industrial large-scale production.

Description

technical field [0001] The invention relates to a method for preparing a hollow cobalt-nickel alloy / porous carbon composite wave-absorbing material, specifically belonging to the field of wave-absorbing material interpretation. Background technique [0002] Due to the rapid development of electronic technology, the problem of electromagnetic wave interference is ubiquitous in our daily life, which not only poses a serious threat to human health, but also affects the operation of precise electronic instruments. In addition, it is of great significance for military equipment to absorb radar waves to achieve the purpose of stealth. Therefore, it is crucial to develop advanced microwave absorbing materials with the advantages of "strong, wide, thin, and light". [0003] Due to high saturation magnetization and high Snoek limit in the GHz range, metal soft magnetic materials such as iron, cobalt, nickel and their alloy particles have more ideal electromagnetic wave absorption ab...

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): H05K9/00B22F9/24C01B32/05
CPCH05K9/0081B22F9/24C01B32/05
Inventor 熊志强杨慧丽沈仲景刘崇波李志飞
Owner NANCHANG HANGKONG UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com