Investigating the relation between debinding atmosphere and mechanical properties of stereolithography-based three-dimensional printed Al2O3 ceramic

Ceramic green bodies fabricated by stereolithography-based three-dimensional printing technology often have high loading of ultraviolet curable resins, which produce undesirable phenomena such as cracking, deformation, and blistering during the debinding process. Results showed that compared to argon and vacuum, air atmosphere provided higher flexural strength owing to the elevated density. The differences in microstructure between specimens prepared under these atmospheres were attributed to exothermic oxidation reactions occurred under air when compared to endothermic pyrolysis reactions under vacuum and argon. The debinding atmosphere showed little effect on crystallite size due to the elevated sintering temperature, which would determine the final crystallite size of Al2O3. Debinding under air atmosphere resulted in flexural strength of 176.69 MPa and open porosity of 23.4%. The flexural strength of the ceramics debinded in air was 21.6% higher than the ceramics debinded in argon atmosphere.

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3D Printing of Calcia-Based Ceramic Core Composites

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.88.65 ◽

2014 ◽

Vol 88 ◽

pp. 65-69

Author(s):

Huo Ping Zhao ◽

Chun Sheng Ye ◽

Zi Tian Fan

Keyword(s):

Bending Strength ◽

Sintering Temperature ◽

Three Dimensional ◽

Fabrication Process ◽

Ceramic Core ◽

Three Dimensional Printing ◽

Freeform Fabrication ◽

Ceramic Components ◽

Hydration Resistance ◽

Dimensional Printing

Three-dimensional printing has been used as a rapid freeform fabrication process to fabricate a wider range of green ceramic components with complex structures difficult to obtain using traditional ceramic fabrication process. In this study, calcia-based ceramic core composites were fabricated by three dimensional printing and sintering operation. The green bodies were printed using a CaO/TiO2powder mixture as a precursor material and ethylene glycol as a binder. They were sintered at 1400-1500 °C for 2 h. The phases and microstructures of these samples were characterized by X-ray diffraction and scanning electron microscopy. The effect of TiO2content and the sintering temperature on the density, hydration resistance and bending strength of the sintered bodies was investigated. It was found that increment of TiO2content and sintering temperature would result in an increase of density of the sintered bodies and then increase of hydration resistance and bending strength.

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Rapid manufacturing of biodegradable pure iron scaffold using amalgamation of three-dimensional printing and pressureless microwave sintering

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406218778304 ◽

2018 ◽

Vol 233 (6) ◽

pp. 1876-1895 ◽

Cited By ~ 4

Author(s):

Pawan Sharma ◽

Pulak M Pandey

Keyword(s):

Yield Strength ◽

Sintered Density ◽

Sintering Temperature ◽

Microwave Sintering ◽

Three Dimensional ◽

Rapid Tooling ◽

Compressive Yield Strength ◽

Soaking Time ◽

Three Dimensional Printing ◽

Dimensional Printing

In the present work, a rapid tooling process using three-dimensional printing and pressureless microwave sintering has been developed for the fabrication of biodegradable pure iron. Carbonyl iron particles were used for sample preparation and phosphate-based investment material was used for mould fabrication. Cylindrical samples were fabricated successfully using the developed rapid tooling process. The fabrication experiments were planned based on response surface methodology to evaluate the effect of microwave sintering parameters, namely sintering temperature, heating rate and soaking time on sintered density, shrinkage and compressive yield strength. The results showed that sintered density and compressive yield strength increased with the rise in sintering temperature from α to γ iron transformation temperature and were found to decrease with further rise in temperature. The shrinkage was found to increase with the increase in sintering temperature. Moreover, with the increase in soaking time and decrease in heating rate, sintered density, shrinkage and compressive yield strength were found to increase. Scanning electron microscopy and the X-ray diffraction plot of the fabricated iron samples showed that even without the application of pressure proper bonding of carbonyl iron particles was achieved. Mould material contamination or oxidation was not evidenced in the experiments. A multi-objective optimization using genetic algorithm was performed to obtain optimum microwave sintering parameters for maximum sintered density as well as compressive strength and minimum shrinkage. A case study on the fabrication of scaffold for human skull was performed to test the efficacy of the developed rapid tooling process.

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Development of Photosensitive Natural Rubber as a Mechanical Modifier for Ultraviolet-Curable Resin Applied in Digital Light Processing-Based Three-Dimensional Printing Technology

ACS Omega ◽

10.1021/acsomega.1c00418 ◽

2021 ◽

Author(s):

Wasan Tessanan ◽

Philippe Daniel ◽

Pranee Phinyocheep

Keyword(s):

Natural Rubber ◽

Three Dimensional ◽

Printing Technology ◽

Digital Light Processing ◽

Three Dimensional Printing ◽

Ultraviolet Curable ◽

Dimensional Printing

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Three Dimensional Printing of Titanium for Bone Tissue Engineering Applications: A Preliminary Study

Journal of Biomimetics Biomaterials and Biomedical Engineering ◽

10.4028/www.scientific.net/jbbbe.21.101 ◽

2014 ◽

Vol 21 ◽

pp. 101-115 ◽

Cited By ~ 6

Author(s):

Vipra Guneta ◽

Jun Kit Wang ◽

Saeed Maleksaeedi ◽

Ze Ming He ◽

Marcus Thien Chong Wong ◽

...

Keyword(s):

Tissue Engineering ◽

Bone Tissue Engineering ◽

Bone Tissue ◽

Computer Aided Design ◽

Sintering Temperature ◽

Three Dimensional ◽

Patient Specific ◽

Three Dimensional Printing ◽

Native Bone ◽

Dimensional Printing

One of the main goals of bone tissue engineering is the development of scaffolds that mimic both functional and structural properties of native bone itself. This study describes the preliminary work carried out to assess the viability of using three dimensional printing (3DP) technology for the fabrication of porous titanium scaffolds with lowered modulus and improved biocompatibility. 3DP enables the manufacturing of three dimensional (3D) objects with a defined structure directly from a Computer Aided Design (CAD). The overall porosity of the 3D structures is contributed by the presence of both pores-by-process (PBP) and pores-by-design (PBD). This study mainly focuses on the PBP, which are formed during the sintering step as the result of the removal of the binding agent polyvinyl alcohol (PVA). Sintering temperatures of 1250oC, 1350oC and 1370oC were used during the fabrication process. Our results showed that by varying the binder percentage and the sintering temperature, pores with diameters in the range of approximately 17-24 μm could be reproducibly achieved. Other physical properties such as surface roughness, porosity and average pore size were also measured for all sample groups. Results from subsequent cell culture studies using adipose tissue-derived mesenchymal stem cells (ASCs) showed improved attachment, viability and proliferation for the 3DP titanium samples as compared to the two-dimensional (2D) dense titanium samples. Hence, based on our current preliminary studies, 3DP technology can potentially be used to fabricate customized, patient-specific metallic bone implants with lowered modulus. This can effectively help in prevention of stress-shielding, and enhancement of implant fixationin vivo. It is envisioned that an optimized combination of binder percentage and sintering temperature can result in the fabrication of scaffolds with the desired porosity and mechanical properties to fit the intended clinical application.

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A novel fast disintegrating tablet fabricated by three‐dimensional printing

Drug Development and Industrial Pharmacy ◽

10.1080/03639040903059359 ◽

2009 ◽

Vol 00 (00) ◽

pp. 090730035508060-7

Author(s):

Deng-Guang Yu ◽

Chris Branford-White ◽

Yi-Cheng Yang ◽

Li-Min Zhu ◽

Edward William Welbeck ◽

...

Keyword(s):

Three Dimensional ◽

Three Dimensional Printing ◽

Fast Disintegrating Tablet ◽

Dimensional Printing

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Faculty Opinions recommendation of Development and initial porcine and cadaver experience with three-dimensional printing of endoscopic and laparoscopic equipment.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.718475764.793516604 ◽

2016 ◽

Author(s):

Mitchell Humphreys

Keyword(s):

Three Dimensional ◽

Three Dimensional Printing ◽

Laparoscopic Equipment ◽

Dimensional Printing

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Central ossifying fibroma of mandible

BMJ Case Reports ◽

10.1136/bcr-2020-239286 ◽

2020 ◽

Vol 13 (12) ◽

pp. e239286

Author(s):

Kumar Nilesh ◽

Prashant Punde ◽

Nitin Shivajirao Patil ◽

Amol Gautam

Keyword(s):

Fibrous Tissue ◽

Three Dimensional ◽

Facial Asymmetry ◽

Ossifying Fibroma ◽

Mandible Reconstruction ◽

Three Dimensional Printing ◽

Osseous Lesion ◽

Large Size ◽

Dimensional Printing

Ossifying fibroma (OF) is a rare, benign, fibro-osseous lesion of the jawbone characterised by replacement of the normal bone with fibrous tissue. The fibrous tissue shows varying amount of calcified structures resembling bone and/or cementum. The central variant of OF is rare, and shows predilection for mandible among the jawbone. Although it is classified as fibro-osseous lesion, it clinically behaves as a benign tumour and can grow to large size, causing bony swelling and facial asymmetry. This paper reports a case of large central OF of mandible in a 40-year-old male patient. The lesion was treated by segmental resection of mandible. Reconstruction of the surgical defect was done using avascular fibula bone graft. Role of three-dimensional printing of jaw and its benefits in surgical planning and reconstruction are also highlighted.

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