Improving the quality of surface in the polishing process with the magnetic abrasive powder polishing using a high-frequency induction heating source on CNC table

Abstract High-frequency induction heating is applied as an alternative heating source for pressureless sintering of commercially pure Ti powders, aiming to intensify the sintering process. The effects of the process parameters on the properties of the sintered material are systematically studied. The initial powder compact density is the most influential parameter permitting sintered structures with highly porous to almost fully dense appearance. Short heating time combined with sintering to temperatures just above the β-transus resulted in a strong diffusion bonding between the Ti powder particles, and grain growth is observed at the former boundaries of the neighboring powder particles. The dimpled appearance of the fracture surface at those regions confirmed the strong metallic interparticle bonding. Tensile properties comparable to those of Ti-Grade 3 and Ti-Grade 4 are achieved, which also demonstrates the efficiency of the induction sintering process. A mechanism explaining the fast and efficient sintering is proposed. The process has the added advantage of minimizing the oxygen pickup.

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Brazing of Aluminum Tubes Using Induction Heating

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.463-464.1405 ◽

2012 ◽

Vol 463-464 ◽

pp. 1405-1409 ◽

Cited By ~ 1

Author(s):

Kristína Demianová ◽

Mária Behúlová ◽

Ožvold Milan ◽

Milan Turňa ◽

Miroslav Sahul

Keyword(s):

Induction Heating ◽

High Frequency ◽

Al Alloys ◽

Temperature Fields ◽

Leak Test ◽

Basic Parameters ◽

Brazed Joints ◽

Edx Microanalysis ◽

High Frequency Induction

The contribution deals with the design of a progressive metallurgical joining of the solar collector parts by brazing. The main aim was to replace flame brazing by the more advantageous technology of brazing using high-frequency induction heating. New equipment and the induction coil of a suitable shape were designed for the joint manufacturing. Based on the numerical simulations of electromagnetic and temperature fields, the basic parameters of induction brazing were suggested in order to achieve the desired temperature distribution at the spot of the future joint. To check the quality of the brazed joints, a leak test, optical microscopy and EDX microanalysis were used to study the area of the brazed joints interface. Impact of brazing time and power supply on brazeability of Al alloys components by means of the AlSi12 braze were assessed.

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Evaluation of Weakening Characteristics of Reinforced Concrete Using High-Frequency Induction Heating Method

Applied Sciences ◽

10.3390/app11125402 ◽

2021 ◽

Vol 11 (12) ◽

pp. 5402

Author(s):

Myung-kwan Lim ◽

Changhee Lee

Keyword(s):

Thermal Expansion ◽

Induction Heating ◽

High Frequency ◽

Thermal Conduction ◽

Rapid Heating ◽

Physical Vulnerability ◽

Heating Method ◽

Expansion Pressure ◽

High Frequency Induction

To increase the quality of recycling, a new demolition technique is required that can work in parallel with existing crushing methods, which use large equipment with high crushing efficiency. Moreover, the efficient collection of the remains from the fractional dismantling method needs to be considered based on its procedure, and the technology for partial dismantling that is efficient in remodeling, maintenance, and reinforcement has to be developed. In this study, the temperature-increasing characteristics of rebars inside ferroconcrete with respect to their arrangement was investigated by partial rapid heating through high-frequency induction heating. Based on this, the chemical and physical vulnerability characteristics of ferroconcrete due to the thermal conduction generated on the rebar surface and the cracks caused by the thermal expansion pressure of the rebar were verified. In addition, the objective of this study was to verify the applicability of the technology by specifying the vulnerability range of ferroconcrete based on the heating range with adequate consumption of energy.

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