Browsing by Subject "powder bed temperature"
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Item Investigation into Laser Sintering of PEEK using Commercially Available Low Powder Bed Temperature Machine(University of Texas at Austin, 2021) Kigure, Takashi; Yamauchi, Yuki; Niino, ToshikiPolyetheretherketone (PEEK) is one of the highest performance plastics in terms of heat and chemical resistance and mechanical strength. Laser sintering of PEEK requires high powder bed temperature above 300℃, and this pushes up machine price and pulls down powder recycle rate which leads to high material cost. The authors are proposing a modified laser sintering process which allows the bed temperature to be set lower than recrystallization temperature, namely low temperature process. In this research, bed temperature of 170 ℃, which is typical for PA12 process, and bed temperature of 200 ℃ which is same as previous study were tested. As a result, parts with a high relative density of more than 95% were obtained at both powder bed temperatures, and parts with a tensile strength of 80 MPa were obtained at a powder bed temperature of 170 °C. This shows that laser sintering of PEEK can be processed with a commercially available laser sintering machine resulting in drastic cost cut in terms of machine and material costs.Item Relationship Between Powder Bed Temperature and Microstructure of Laser Sintered PA12 Parts(University of Texas at Austin, 2019) Kigure, T.; Yamauchi, Y.; Niino, T.The microstructure of a part from semi-crystalline polymers used in laser sintering gives a significant impact on the mechanical properties of the parts. The microstructure of laser sintering parts depends on powder bed temperature. If the powder bed temperature can be set in a wide range, it is also possible to control the microstructure of a part. The authors have been introducing a modified laser sintering process, namely low temperature process. The process allows powder bed temperature being set wide range. In this research, relationship between microstructure of PA12 parts by low-temperature process and powder bed temperature is investigated. As a result, high strength and crystallinity were obtained in high powder bed temperature, and high ductility and low crystallinity were obtained in low powder bed temperature. This result indicates that parts having the desired mechanical properties can be obtained by controlling the powder bed temperature.