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Sintering Behavior of Ni/TiC Cermet Scaffolds Fabricated via Particle-Based Ink Extrusion 3D Printing

Ajjarapu, Kameswara Pavan Kumar
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1563526881882643

Abstract Details

2019, MS, University of Cincinnati, Engineering and Applied Science: Materials Science.
Scaffolds have a variety of applications from batteries to biomedical implants due to their low density and high surface area. Cermet scaffolds in particular are attracting significant attention in the recent past, due to combining the advantageous properties of both metals and ceramics. Cermets have traditionally been used in wear resistant, high temperature resistant, high speed tooling applications. Cermet scaffolds such as Ni-YSZ, Ni-CGO, and Cu-infiltrated-YSZ find applications in solid oxide fuel cells while cermets of calcium silicate with Ti-55Ni and Ti-6Al-4V are used for hard tissue replacements and other biomedical applications. Fabricating such geometrically complex structures via traditional subtractive manufacturing techniques is difficult and even using powder bed additive manufacturing methods poses problems due to poor sintering and high residual stresses. In this study, we aim to assess the feasibility of producing Ni-TiC cermet scaffolds via a particle-based liquid ink extrusion 3D printing approach. The main objective of this thesis was to determine suitable annealing conditions (i.e. time, temperature, atmosphere) to post-process the printed cermet scaffolds and understand the sintering behavior. Ni-TiC (50-50 vol.%) particle inks were prepared by mixing DCM, DBP, 2-Bu and PLGA along with the Ni and TiC powders in the prescribed ratio. DBP served as a plasticizer and 2-Bu served as a surfactant while PLGA was used as a co-polymeric binder to hold the powder particles together. Scaffolds with dimensions of approximately 10-15 mm in diameter, 5-15 mm in height, and a square infill pattern, were printed and subjected to various heat treatment processes. The as-printed and sintered structures were then characterized using conventional metallography techniques to investigate microstructural and compositional changes as a function of time, temperature and environment to qualitatively understand the sintering behavior.
Ashley Paz y Puente, Ph.D. (Committee Chair)
Matthew Steiner, Ph.D. (Committee Member)
Sarah Watzman, Ph.D. (Committee Member)
98 p.
Materials Science
Additive Manufacturing; Extrusion-based 3D printing; Sintering; Ni TiC cermet; Cermet scaffold

Recommended Citations

Citations

  • Ajjarapu, K. P. K. (2019). Sintering Behavior of Ni/TiC Cermet Scaffolds Fabricated via Particle-Based Ink Extrusion 3D Printing [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1563526881882643

    APA Style (7th edition)

  • Ajjarapu, Kameswara Pavan Kumar. Sintering Behavior of Ni/TiC Cermet Scaffolds Fabricated via Particle-Based Ink Extrusion 3D Printing. 2019. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1563526881882643.

    MLA Style (8th edition)

  • Ajjarapu, Kameswara Pavan Kumar. "Sintering Behavior of Ni/TiC Cermet Scaffolds Fabricated via Particle-Based Ink Extrusion 3D Printing." Master's thesis, University of Cincinnati, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1563526881882643

    Chicago Manual of Style (17th edition)

ucin1563526881882643
479
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This open access ETD is published by University of Cincinnati and OhioLINK.