Production of Low Coefficient of Thermal Expansion Composite Tooling Manufactured Via 3D Printing

Cortes, Pedro; Maravola, Michael; Conner, Brett; Szaruga, Stephen L.; Hetzel, Brian P; MacDonald, Eric

doi:10.33599/nasampe/s.19.1556

Cited by 2 publications

(1 citation statement)

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“…From Fig. 9, it is observed an averaged CTE value 4.8 × 10 -6 C −1 , a value that suggests that these materials could be used as promising structures for composite tooling applications [63]. Parts printed in Z-direction were subjected to an abrasive test, and the height and volume loss was recorded at 5, 15, 30 and 60 min intervals starting with cylindrical samples of 12.6 mm high (see Fig.…”

Section: Resultsmentioning

confidence: 95%

Mechanical performance of lightweight ceramic structures via binder jetting of microspheres

et al. 2021

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Geometrically-complex and lightweight ceramic parts manufactured via 3D printing are prospective structures that seem to provide excellent thermal, wear and dielectric performance. In the present work, binder jetted parts based on synthetic lightweight ceramic hollow microspheres were manufactured and evaluated under different testing conditions in order to characterize their mechanical performance. The resulting structures were assessed in terms of quasi-static flexural and compressive strength, and density. Furthermore, microscopy analyses highlighted the composition of the final structures and fracture mechanisms. The printed system mainly consisted of aluminum silicon dioxide, fly ash and traces of metal. The samples yielded similar strength as that achieved on conventional bulk-based 3D printed ceramic structures. It was observed that the strength of the printed microspheres increased by sintering the parts to near-fusion temperatures due to viscous flow of material during sintering. The combination of the proposed process and feedstock represents an attractive manufacturing method for fabricating lightweight structures for applications like composite tooling molds, electromagnetic devices, and biomedical implants.

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Section: Resultsmentioning

confidence: 95%

Mechanical performance of lightweight ceramic structures via binder jetting of microspheres

et al. 2021

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The fracture properties of metal‐ceramic composites manufactured via stereolithography

Mummareddy

Maravola

MacDonald

et al. 2019

Int J Applied Ceramic Tech

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In this work, metal-ceramic composite parts based on aluminum and alumina were manufactured in a two-stage process. First, silica was printed using a vat photopolymerization technique, followed by a curing and sintering stage, which resulted in ceramic precursors. Subsequently, these samples were subjected to a metal infiltration process to form interpenetrating metal-ceramic composites (IPCs). These composites have attracted considerable attention in the aerospace and defense sector due to the ductility associated to the metal phase and the strength offered by the ceramics. A novel application with utility includes composite tooling which requires a low coefficient of thermal expansion (CTE) for high temperatures. The investigated specimens were tested for surface quality and shrinkage, followed by a mechanical characterization. It was recorded that the samples presented a 12%-18% of shrinkage after the sintering process. The mechanical testing showed that the hardness, compression, and flexural strength of the composites were superior to the printed and sintered ceramics. A thermal analysis on the composite showed that its CTE is more than two times lower than the common composite tooling materials. It is expected that the present work can provide the foundations for further studies on these systems in the refractory, automotive, and armor-based fields. K E Y W O R D Sceramic-metal systems, fracture, mechanical properties 414 | MUMMAREDDY Et Al.

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Production of Low Coefficient of Thermal Expansion Composite Tooling Manufactured Via 3D Printing

Cited by 2 publications

References 0 publications

Mechanical performance of lightweight ceramic structures via binder jetting of microspheres

Mechanical performance of lightweight ceramic structures via binder jetting of microspheres

The fracture properties of metal‐ceramic composites manufactured via stereolithography

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