Prospects of the room temperature fabrication method for electroceramics. Feasibility for printing techniques and integration with temperature-sensitive materials
Thesis event information
Date and time of the thesis defence
Place of the thesis defence
Linnanmaa campus, lecture hall L10
Topic of the dissertation
Prospects of the room temperature fabrication method for electroceramics. Feasibility for printing techniques and integration with temperature-sensitive materials
Doctoral candidate
Master of Science Maria Väätäjä
Faculty and unit
University of Oulu Graduate School, Faculty of Information Technology and Electrical Engineering, Microelectronics research unit
Subject of study
Electrical engineering
Opponent
Professor Leena Ukkonen, Tampere university
Custos
Professor Heli Jantunen, University of Oulu
All-ceramic components can be printed without high temperature processing
The dissertation research combined the room temperature fabrication method for electroceramics with printing techniques.
The dissertation research developed further the room temperature fabrication method for electroceramics, which allows manufacturing of ceramic components even at room temperature instead of the over 1000 ° C used in conventional fabrication. The method takes advantage of the water solubility of certain ceramic materials and pressing pressure. A key research objective was the development of ceramic pastes for realization of components by 3D printing with extrusion and 2D stencil printing.
The paste compositions were adjusted mainly by changing the amount of added water. Because of the lower pressures available in printing, the samples had lower relative densities and thus lower values of dielectric properties compared to the conventional samples formed with pressing. They were still feasible for microwave applications.
Nowadays printing technologies offer the means for easy and cost-efficient manufacture of electronic devices, especially from plastics. However, the dissertation research showed that corresponding methods can also be used in the fabrication of electroceramic components. In addition, sample preparation became straightforward, as the pastes did not require organic solvents or a separate heating step to remove them.
In addition, the research verified that simultaneous processing and direct integration of electroceramics with temperature-sensitive materials is possible using the room temperature fabrication method. The high-temperature processing used in conventional method alter temperature-sensitive compositions and thus cannot be integrated into plastic substrates, for example.
The results pave the way for fabrication of electronics and telecommunication devices with significant savings in time, cost, and energy.
The dissertation research developed further the room temperature fabrication method for electroceramics, which allows manufacturing of ceramic components even at room temperature instead of the over 1000 ° C used in conventional fabrication. The method takes advantage of the water solubility of certain ceramic materials and pressing pressure. A key research objective was the development of ceramic pastes for realization of components by 3D printing with extrusion and 2D stencil printing.
The paste compositions were adjusted mainly by changing the amount of added water. Because of the lower pressures available in printing, the samples had lower relative densities and thus lower values of dielectric properties compared to the conventional samples formed with pressing. They were still feasible for microwave applications.
Nowadays printing technologies offer the means for easy and cost-efficient manufacture of electronic devices, especially from plastics. However, the dissertation research showed that corresponding methods can also be used in the fabrication of electroceramic components. In addition, sample preparation became straightforward, as the pastes did not require organic solvents or a separate heating step to remove them.
In addition, the research verified that simultaneous processing and direct integration of electroceramics with temperature-sensitive materials is possible using the room temperature fabrication method. The high-temperature processing used in conventional method alter temperature-sensitive compositions and thus cannot be integrated into plastic substrates, for example.
The results pave the way for fabrication of electronics and telecommunication devices with significant savings in time, cost, and energy.
Last updated: 23.1.2024