Effects of material morphology and processing conditions on the characteristics of hydroxyapatite and high-density polyethylene biocomposites by selective laser sintering

Hao, Liang; Savalani, M. M.; Zhang, Y.; Tanner, K.E.; Harris, Russell A.

doi:10.1243/14644207jmda92

Cited by 23 publications

(30 citation statements)

References 28 publications

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“…Strut thickness was seen to increase quadratically as scan spacing decreased. Similar findings -an increase in part dimensions with in-creased delivered energy density -were reported by Hao et al and Caulfield et al [11,20]. As delivered energy density is determined by scan spacing and laser fill power, it was anticipated that the interaction effect of these two parameters would be significant.…”

Section: Discussionsupporting

confidence: 74%

“…Some groups were able to directly fabricate bioceramic bone implants using an experimental SLS system [2,3], however, to process bioceramics a thermoplastic polymer functioning as a binder material is usually required, as the lasers used in typical commercial SLS systems are unable to fuse ceramic particles together. Several biocompatible polymers have been used for SLS fabrication of scaffolds, including polyethylene, polyetheretherketone, polycaprolactone, polylactide glycolide, polyvinyl alcohol and their composites with hydroxyapatite and other bioceramics [4][5][6][7][8][9][10][11][12]. However, much of this research has only demonstrated the feasibility of fusing powder particles together, and not the fabrication of complex predesigned 3D structures.…”

Section: Introductionmentioning

confidence: 99%

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Selective laser sintering of hydroxyapatite/poly-ε-caprolactone scaffolds

et al. 2010

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Selective laser sintering (SLS) enables the fabrication of complex geometries with the intricate and controllable internal architecture required in the field of tissue engineering. In this study hydroxyapatite and poly--caprolactone, considered suitable for hard tissue engineering purposes, were used in a weight ratio of 30:70. The quality of the fabricated parts is influenced by various process parameters. Among them Four parameters, namely laser fill power, outline laser power, scan spacing and part orientation, were identified as important. These parameters were investigated according to a central composite design and a model of the effects of these parameters on the accuracy and mechanical properties of the fabricated parts was developed. The dimensions of the fabricated parts were strongly dependent on the manufacturing direction and scan spacing. Repeatability analysis shows that the fabricated features can be well reproduced. However, there were deviations from the nominal dimensions, with the features being larger than those designed. The compressive modulus and yield strength of the fabricated microstructures with a designed relative density of 0.33 varied between 0.6 and 2.3 and 0.1 and 0.6 MPa, respectively. The mechanical behavior was strongly dependent on the manufacturing direction.

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Section: Discussionsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Selective laser sintering of hydroxyapatite/poly-ε-caprolactone scaffolds

et al. 2010

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“…Examples include ceramic-glass composites [106][107][108][109][110][111] and ceramic-polymer composites. [112][113][114][115][116] Here, the low-melting glass/ polymer provides densification due to the liquid phase formation. Most of these studied material systems are biocompatible and/or bioactive and designated for biomedical applications that require biocompatibility of materials and complex shapes of products as key mechanical properties.…”

Section: Indirect Slsmentioning

confidence: 99%

Additive Manufacturing of Ceramic‐Based Materials

et al. 2014

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This paper offers a review of present achievements in the field of processing of ceramic-based materials with complex geometry using the main additive manufacturing (AM) technologies. In AM, the geometrical design of a desired ceramic-based component is combined with the materials design. In this way, the fabrication times and the product costs of ceramic-based parts with required properties can be substantially reduced. However, dimensional accuracy and surface finish still remain crucial features in today's AM due to the layer-by-layer formation of the parts. In spite of the fact that significant progress has been made in the development of feedstock materials, the most difficult limitations for AM technologies are the restrictions set by material selection for each AM method and aspects considering the inner architectural design of the manufactured parts. Hence, any future progress in the field of AM should be based on the improvement of the existing technologies or, alternatively, the development of new approaches with an emphasis on parts allowing the near-net formation of ceramic structures, while optimizing the design of new materials and of the part architecture.

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“…Polymer powders and ceramic are mixed and laser sintered to form the composite, e.g. PCL and HA [215], PEEK and HA [192], PE and HA [70,165], PA and nano-clay [84], PA and HA [166,167] etc. [29,211].…”

Section: 51mentioning

confidence: 99%