For such applications fabrication of thick AlN coating by thermal spray into the chosen material surface considered to be suitable solution. However, it is impossible to fabricate AlN coating directly by conventional thermal spraying due to the AlN thermal decomposition without melting.
SEM cross section images of the AlN coatings fabricated with using N2 plasma gas flow rate of: (a) 100, (b) 120, (c) 160 l/min and (d-f) are higher magnifications of the squared parts in (a-c).
Here, Mohammed Shahien and colleagues at Toyohashi University of Technology, Japan report on the realization of cubic AlN coatings on steel substrates by atmospheric reactive plasma spraying of fine Al2O3 feedstock powder in N2/H2 plasma.
The formation process was clarified thus, during spray the particles melted, spheroidized and nitrided in the plasma to form the cubic aluminum oxynitride then cubic-AlN. Furthermore, using smaller particle size enhanced the surface (reaction) area and improved the nitriding conversion.
It was possible to fabricate thick and uniform coatings with high AlN content by spraying fine Al2O3/AlN mixture and the thickness increased from about 150 µm to about 200 µm with increasing the N2 gas flow rate from 100 to 160 l/min.
These results are important for the manufacture of high performance equipment for the materials manufacturing including semiconductors.
Affiliation: Interface & Surface Fabrication Laboratory, Department of Mechanical Engineering
| Toyohashi Tech e-Newsletter
Mass production of individualized products
02.06.2020 | Fraunhofer Institute for Electronic Nano Systems ENAS
Clean without scrubbing and using chemicals
28.05.2020 | Technische Universität Dresden
Two prominent X-ray emission lines of highly charged iron have puzzled astrophysicists for decades: their measured and calculated brightness ratios always disagree. This hinders good determinations of plasma temperatures and densities. New, careful high-precision measurements, together with top-level calculations now exclude all hitherto proposed explanations for this discrepancy, and thus deepen the problem.
Hot astrophysical plasmas fill the intergalactic space, and brightly shine in stellar coronae, active galactic nuclei, and supernova remnants. They contain...
In living cells, enzymes drive biochemical metabolic processes enabling reactions to take place efficiently. It is this very ability which allows them to be used as catalysts in biotechnology, for example to create chemical products such as pharmaceutics. Researchers now identified an enzyme that, when illuminated with blue light, becomes catalytically active and initiates a reaction that was previously unknown in enzymatics. The study was published in "Nature Communications".
Enzymes: they are the central drivers for biochemical metabolic processes in every living cell, enabling reactions to take place efficiently. It is this very...
Early detection of tumors is extremely important in treating cancer. A new technique developed by researchers at the University of California, Davis offers a significant advance in using magnetic resonance imaging to pick out even very small tumors from normal tissue. The work is published May 25 in the journal Nature Nanotechnology.
researchers at the University of California, Davis offers a significant advance in using magnetic resonance imaging to pick out even very small tumors from...
Microelectronics as a key technology enables numerous innovations in the field of intelligent medical technology. The Fraunhofer Institute for Biomedical Engineering IBMT coordinates the BMBF cooperative project "I-call" realizing the first electronic system for ultrasound-based, safe and interference-resistant data transmission between implants in the human body.
When microelectronic systems are used for medical applications, they have to meet high requirements in terms of biocompatibility, reliability, energy...
Thomas Heine, Professor of Theoretical Chemistry at TU Dresden, together with his team, first predicted a topological 2D polymer in 2019. Only one year later, an international team led by Italian researchers was able to synthesize these materials and experimentally prove their topological properties. For the renowned journal Nature Materials, this was the occasion to invite Thomas Heine to a News and Views article, which was published this week. Under the title "Making 2D Topological Polymers a reality" Prof. Heine describes how his theory became a reality.
Ultrathin materials are extremely interesting as building blocks for next generation nano electronic devices, as it is much easier to make circuits and other...
19.05.2020 | Event News
07.04.2020 | Event News
06.04.2020 | Event News
02.06.2020 | Power and Electrical Engineering
02.06.2020 | Architecture and Construction
02.06.2020 | Life Sciences