Publication detail

Characterization of porosity and hollow defects in ceramic objects built by extrusion additive manufacturing

ČELKO, L. GUTIÉRREZ CANO, V. CASAS LUNA, M. MATULA, J. OLIVER-URRUTIA, C. REMEŠOVÁ, M. DVOŘÁK, K. ZIKMUND, T. KAISER, J. MONTUFAR JIMENEZ, E.

Original Title

Characterization of porosity and hollow defects in ceramic objects built by extrusion additive manufacturing

Type

journal article in Web of Science

Language

English

Original Abstract

Direct ink writing, or robocasting, is an extrusion additive manufacturing technique for the fabrication of complex ceramic parts. Pores are common defects in post-sintered robocast parts that strongly influence the performance by changing the density, the transport properties, and the mechanical strength. In this work, the porosity (volumetric fraction, size distribution, geometry and topological distribution) of monolithic and 3D-lattice specimens made of hydroxyapatite was comprehensively characterized at multiple length scales through the six most widely used experimental methods for the study of porous materials. These two types of samples embrace the two most common types of additive manufactured ceramics and allowed the study of materials with pores in the submicron scale, as well as materials with a bimodal pore size distribution at significantly different length scales. Detected pores were divided into (1) engineered porosity set by the structural design, and (2) hollow defects, including intergranular porosity, trapped-air pores, cracks, and cavities, that overlapped at different length scales with the engineered porosity. The origin and mechanisms of formation of hollow defects are discussed, providing guidelines to avoid them. The experimental methods that allow discerning between pores and hollow defects are highlighted, and their advantages and drawbacks are discussed. This work might serve as a guide for the selection of the proper combination of methods for the pore evaluation of similar additive manufactured parts.

Keywords

Porosity; Robocasting; N-2 adsorption; Mercury intrusion porosimetry; X-ray computed tomography

Authors

ČELKO, L.; GUTIÉRREZ CANO, V.; CASAS LUNA, M.; MATULA, J.; OLIVER-URRUTIA, C.; REMEŠOVÁ, M.; DVOŘÁK, K.; ZIKMUND, T.; KAISER, J.; MONTUFAR JIMENEZ, E.

Released

1. 11. 2021

Publisher

ELSEVIER

Location

AMSTERDAM

ISBN

2214-8604

Periodical

Additive Manufacturing

Year of study

47

Number

1

State

Kingdom of the Netherlands

Pages from

1

Pages to

12

Pages count

12

URL

https://www.webofscience.com/wos/woscc/full-record/WOS:000701887600001

BibTex

@article{BUT172824,
  author="Ladislav {Čelko} and Vanessa {Gutiérrez Cano} and Mariano {Casas Luna} and Jan {Matula} and Carolina {Oliver Urrutia} and Michaela {Remešová} and Karel {Dvořák} and Tomáš {Zikmund} and Jozef {Kaiser} and Edgar Benjamin {Montufar Jimenez}",
  title="Characterization of porosity and hollow defects in ceramic objects built by extrusion additive manufacturing",
  journal="Additive Manufacturing",
  year="2021",
  volume="47",
  number="1",
  pages="1--12",
  doi="10.1016/j.addma.2021.102272",
  issn="2214-8604",
  url="https://www.webofscience.com/wos/woscc/full-record/WOS:000701887600001"
}