Laser technology in synthesis and processing of SHS derived max materials текст наукової роботи за медичними технологіями з наукового журналу International Symposium on Self-Propagating High-Temperature Synthesis.
Текст наукової роботи на тему «Laser technology in synthesis and processing of SHS derived max materials»
LASER TECHNOLOGY IN SYNTHESIS AND PROCESSING OF SHS
DERIVED MAX MATERIALS
J. Lis * ", P. Rutkowski", D. Kata ", L. Chlubny", and D. SalaA
aAGH University of Science and Technology in Krakow, Faculty of Materials Science and
Ceramics, Krakow, 30-059 Poland bAGH University of Science and Technology in Krakow, Faculty of Management,
DOI: 10.24411 / 9999-0014A-2019-10084
Laser processing has contributed to almost all engineering areas that include mechanical, materials, industrial, aerospace, electrical and most recently biomedical engineering. Today, laser processing of ceramic becoming popular also, due to its flexible and customized manufacturing capabilities. The most interesting feature is to manufacture and shaping of new compounds difficult to obtain by conventional methods.
MAX phases are interesting group of layered ternary and quaternary materials which are combining properties typical for metals and ceramics [1-3]. Self-propagating high-temperature synthesis (SHS) is a versatile method used for the technology of obtaining a wide range of materials. It has been shown by the authors, that various MAX phase materials can be synthesized using SHS technique [4-8].
This paper concerns possibilities of continues work fiber laser application to MAX phases SHS synthesis and processing of polycrystalline MAXes prepared from SHS derived powders. In the first part of the research the laser apparatus was used to initiate of combustion of MAX phases in the Ti-Si-C system . For that purpose, special prototype reaction chamber combined with laser scanner were used. The laser configuration allowed also the control of released temperature and monitor the reaction bed behavior. In combination with reaction bed thermal properties of differently packed material it allows to understand synthesis temperature rate. It was found that this technique, SHS initiated and controlled by laser beam, allows to obtain of MAX layers as well as products from the MAX phases in the form of 3D printed.
The second part of research concerns laser processing of hot-pressed Ti3AlC2 and Ti2AlC MAX phases prepared from SHS powders . Both of materials were cut or welded in various laser condition such as laser power or processing speed rate. In case of Ti3AlC2 MAX phase it was possible to obtain stable material joining. The titanium element was a major cause of material joining and secondary phases 'recrystallization. Also, it was noticed that second type of laser processing instead of ablation process leads to filling cavity by the recrystallized material and results in Ti3AlC2 material healing process.
Different situation during subtractive laser processing was in the case of Ti2AlC material, which showed high porosity. During the surface laser modification, probably the generated pressure during laser machining allowed to fill the porous sides of the cut by recrystallized material. So, in this case, healing process was impossible at the expense of cut surfaces densification. The trial identification of recrystallized secondary phase in various heat affected zones (HAZ) as an effect of laser processing was made. The HAZ were examined. It was conducted in case of material welding, cutting and healing. The following analysis were made: optical microscopy, SEM, EDS, FIB.
J. Lis et al.
XV International Symposium on Self-Propagating High-Temperature Synthesis
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J. Lis et al.
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