【Scientific and Technological Achievements Promotion】 Magnetic Field-Microwave Composite Field Catalytic Technology

Electromagnetic strengthening technology is a material treatment technology that promotes the redistribution of crystal microscopic defects through a specific electromagnetic field at room temperature, improves microstructure-mechanical uniformity, increases crack initiation and expansion resistance, and comprehensively improves material wear resistance, fatigue resistance and reliability. At present, a large number of applications have been carried out in the manufacturing industry, including: in the field of automobile manufacturing, construction machinery and other equipment manufacturing, electromagnetic strengthening is used to improve the service life of machining tools, reducing costs and increasing efficiency for enterprises; in the field of aerospace, electromagnetic strengthening is used to improve aviation The service life and reliability of key aviation basic parts such as cutting tools, special bolts, and bearings.
 

　The Institute of Tool & Bearing Electromagnetic Strengthening Technology (hereinafter referred to as "Tool Institute") has innovatively proposed a multi-field composite processing technology based on magnetic field and microwave field (referred to as "wave-field processing technology"),This technique can be used for both solution and solid material properties improvement. Next, please take a look at how the technology achieves performance improvement ~
 

science and technology research and development

Wave-field processing technology is an emerging processing technology that couples a specific frequency microwave field with a certain intensity of magnetic field, and has great application prospects in chemical reaction processing and material performance improvement. Microwave and magnetic field, if in the appropriate matching conditions, can make the low energy level of the electron just transition to the high energy level, so that the spin configuration of the electron changes. Taking the free radical reaction as an example, the spin configuration of the free radical pair as an important intermediate in the reaction process affects the reaction path, and after adding the wave-field treatment, the reaction path, product distribution and reaction rate can be controlled by affecting the spin configuration of the free radical pair.
Principle
The external magnetic field can affect the inter-system cross-over process between different spin states through the Δg mechanism, which leads to changes in the rate of chemical reactions and the distribution of reaction products. Based on the free radical pair model, the external magnetic field makes the particles containing unpaired electrons produce the Zeeman splitting phenomenon, so that the particles with different spin configurations produce an energy difference between the particles, if at this time in the direction of the magnetic field perpendicular to the microwave field, and the microwave frequency just meet.

hv=△E

where h is Planck's constant and v is the wave field frequency.
Then electrons at low energy levels can absorb microwave energy and jump to high energy levels, a phenomenon known as electron paramagnetic resonance. Using this principle, the magnetic field-microwave composite treatment can further affect the free radical reaction process and yield.
In the experiment, the photochemical reaction of benzophenone and isopropanol was studied, and the catalytic effect of wave-field technique on the reaction was carried out, and its mechanism was discussed. The reaction system of benzophenone-isopropanol was placed in different wave-field processes to react, and the synthetic products were obtained under different process conditions. The relationship between the relative concentration of reactants and the quality of products over time can be obtained by analyzing the solution and products after the reaction. It is found that when magnetic field and microwave are applied, the macroscopic reaction rate of benzophenone-isopropanol system increases significantly, the photochemical reaction accelerates, and the reaction process is "catalyzed". This phenomenon illustrates the effectiveness of using wave-field technology to regulate free radical reactions.


 

 
Spin configuration changes under magnetic and microwave field coupling

Experiment of Free Radical Reaction under Multi-field Combined Action


science and technology innovation

After discovering this phenomenon,The cutting tool is based on the field of food brewing, taking liquor solution as the application object, using wave-field processing technology to study the aging process of liquor, and realizing the discovery that the technology can catalyze the physical and chemical reactions of various substances in liquor and accelerate the aging process of liquor. The relevant research results have been published in the English journal "CyTA-Journal of Food" and have received widespread attention.
Specifically, after the liquor solution is treated by wave-field technology, the hydrogen bond structure of water-ethanol is weakened, the hydrogen bond between molecules is distorted or even broken in this process, and the structure of larger associated molecules is depolymerized to form more polar molecular associations. Under the association of hydrogen bonds, the pungent taste of liquor can be reduced, and the smell and taste of liquor become soft. At the same time, under the action of magnetic field-microwave, the activation energy of molecules in the wine body is improved, and the chemical reaction of various flavor substances is promoted, so that the concentration of various alcohols and esters in liquor is increased, and more flavor substances are generated. Make the wine body more mellow and sweet.

 

Technological innovation has brought more possibilities for scientific and technological research and development, and the application of wave-field processing technology has actively promoted scientific and technological research and development and the development of related industries in many directions:
　　Expanding the scope of application of electromagnetic strengthening technology,A chemical catalytic model under unique magnetic field and natural frequency microwave is established, and the change law of free radical pair spin configuration under the action of composite field is studied.
The magnetic field-microwave non-contact process system is used to try the application in the field of food brewing.Under the electromagnetic field-microwave coupling, the speed of liquor association and esterification is accelerated,It can significantly shorten the production cycle of artificial aging liquor.
For ceramic materials, the formation of radical-like structures between dislocations and obstacles,The electron spin behavior can be affected by the magnetic microwave composite field, which may become a new process scheme for the modification of ceramic materials.




 

application value

01 Food brewing field
For example, in the field of liquor, after the finished liquor is treated by the compound field of magnetic field and microwave, the aroma is elegant, scorched and high in acidity. After a period of sobering up, the aroma is more balanced, the entrance is full, the wine body is thick and heavy, the empty cup has good fragrance retention, and the flavors are coordinated. The wave-field processing technology developed by the cutting tool can be applied to customized equipment and process processing services to improve the quality of food brewing and serve the public.
02 Facing the field of machining tools
In machining tools, especially ceramic-based tools, wave-field treatment technology can be used for precision ceramic tools and cubic boron nitride tools to further improve tool life, improve the surface quality of processed parts, and reduce costs and increase efficiency for enterprises.



 

Tool & Bearing Electromagnetic Strengthening Technology Research Institute
Tool & Bearing Electromagnetic Strengthening Technology Research Institute was established in September 2015, focusing on electromagnetic strengthening technology, electromagnetic strengthening equipment research and development and industrial application work, is the leading electromagnetic strengthening technology research and development and application team. Electromagnetic strengthening technology, originated from the technology accumulation of Tsinghua for more than 20 years, is the first treatment technology proposed by Tsinghua University, which can greatly improve the wear resistance, service performance and reliability of alloy and cermet components. This technology is widely applicable to machining tools, bearings, bolts, gears, hydraulic pump valves and other key components with friction and wear made of various hard alloys, high-speed steel, diamond, CBN and other materials (including coatings), it has the characteristics of no change in the appearance and size of the components, no pollution, high efficiency, and direct processing with packaging. It has undergone multi-industry and multi-batch practical testing. The research team is mainly composed of doctors, masters and experienced engineers from Tsinghua University. The team members are enthusiastic and energetic, have a strong sense of innovation and cooperation spirit, and uphold the concept of honesty and pragmatism to provide our customers with high-quality services.

 

Technical docking and business negotiation
Contact: Ji Wen
Contact number: 18810069596
E-mail: jiwen@tsinghua-tj.org

Source | Tool & Bearing Electromagnetic Strengthening Technology Research Institute
Editor | Zhang Shu
The final interpretation of the above related technologies belongs to the Tool & Bearing Electromagnetic Strengthening Technology Institute.