Microstructural evolution during fabrication of alumina via laser stereolithography technique

Azarmi, Fardad; Amiri, Ali

doi:10.1016/j.ceramint.2018.09.163

Cited by 39 publications

(15 citation statements)

References 26 publications

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“…The entire crystal can be viewed as an infinite number of octahedrons [AlO 6 ] formed by coplanar combination of large molecules, which adds stability to α-alumina [39]. These results are consistent with Azarmi et al [40], who showed the existence of the α-Al 2 O 3 detected in initial printed samples without any change during debinding and sintering processes.…”

Section: Microstructure and Compositionsupporting

confidence: 87%

“…The detailed data are listed in Table 1 [6]. Among these materials, alumina has been widely used due to its high melting point, high hardness, and excellent wear and corrosion resistance [7]. For silica-based ceramic cores, the sintering shrinkage needs to be as low as 1% and the flexural strength should be 10-40 MPa in order endure the high thermal load [8].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Sintering Temperature on Microstructure and Mechanical Properties of Al2O3 Ceramic via 3D Stereolithography

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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In this work, aluminum oxide (Al 2 O 3 ) ceramic samples were fabricated by 3D stereolithography printing. Printing process was followed by debinding and sintering. In addition, the effect of sintering temperature on microstructure and properties was investigated. Flexure strength was observed to increase with increasing sintering temperature due to fewer pores, fewer defects and stronger grain boundary bonding of samples at higher sintering temperatures. Maximum flexure strength of 138.5 MPa was obtained when sintering temperature was 150 °C. Furthermore, the shrinkage along length direction decreased with the decreasing sintering temperature until reaching minimum value of 1.02% after sintering at 1200 °C. After sintering at 1280 °C, flexure strength was 24.0 MPa and the shrinkage along length direction was 2.1%, which meets demands of ceramic core.

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Section: Microstructure and Compositionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Influence of Sintering Temperature on Microstructure and Mechanical Properties of Al2O3 Ceramic via 3D Stereolithography

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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“…Conventional alumina parts can be 3D printed by a variety of techniques including powder bed binder jetting, direct ink write, and sterolithography 15 . Commercial stereolithography systems by Lithoz (Lithoz GmbH, Vienna, Austria), 3DCeram (3DCeram SAS, Limoges, France), and Admatec (Admatec Europe BV, Alkmaar, Netherlands) have demonstrated production of >99% dense alumina parts with a feature resolution down to 200 µm 16,17,18,19 . Addition of a controllable texturing mechanism to the printer could enable simultaneous shape and microstructure control on demand.…”

Section: Introductionmentioning

confidence: 99%

Rheology and processing of UV‐curable textured alumina inks for additive manufacturing

Rosenberger

Vargas-Gonzalez

et al. 2021

Int J Applied Ceramic Tech

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A UV‐curable resin containing alumina (Al2O3) powder and platelets was developed and characterized using a proof‐of concept tape‐casting system and trialed on a commercially available 3D‐printing platform (Admatec Admaflex 130). The influence of solids loading and solids platelet fraction on resin viscosity and depth of cure was investigated. Resins containing up to 40 vol% solids loading at platelet fractions up to 50% were found to have sufficiently low viscosity for tape casting and cure depths ranging from 0.29 to 0.39 mm. Alumina platelets were observed to lower ink viscosity but also reduce shear thinning behavior compared to inks containing only powder. Printability of inks was assessed by layered tape casting, and verified with a trial build on an Admaflex 130. Due to the low solids loading of the resin, hot pressing at 1300°C and 66 MPa was employed to sinter specimens containing no platelets and 15% platelet fractions, yielding specimens with near theoretical densities (99.7%) and average grain sizes of 0.96 µm and 0.83 µm, respectively. Alignment before and after sintering was assessed by SEM and XRD, with lotgering factors of 0.045±0.005 and 0.114 measured in the green and sintered specimens, respectively.

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“…A variety of 3D-printing techniques are innovated and improved, which can be classified into seven categories: binder jetting, directed energy deposition, material extrusion, material jetting, powder bed fusion, sheet lamination, and vat photopolymerization, according to the stand of the International Organization for Standardization (ISO)/American Society for Testing and Materials (ASTM) 52,900:2015. Interestingly, several techniques among these are based on suspensions (slurries) with aspecific rheological properties, i.e., the materials are in the form of suspensions for undergoing 3D printing [5,[9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Principles of Dispersing Powders for 3D Printing

Zhou

Wang

Peng

et al. 2021

Colloids and Interfaces

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During the past 30 years, more and more 3D-printing techniques based on suspensions with specific rheological properties have been innovated and improved. In this review, principles of dispersing and controlling powders for suspension-based 3D printing are summarized. The suspensions for direct ink writing (DIW) are taken as an example for 3D printing. According to the rheological property requirement of suspensions for direct ink writing, the routes on how its rheological properties can be manipulated are summarized and classified into two categories: I. self-solidification route; II. assistant-solidification route. The perspective on the future of 3D-printing techniques based on suspensions is also discussed.

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Microstructural evolution during fabrication of alumina via laser stereolithography technique

Cited by 39 publications

References 26 publications

Influence of Sintering Temperature on Microstructure and Mechanical Properties of Al2O3 Ceramic via 3D Stereolithography

Influence of Sintering Temperature on Microstructure and Mechanical Properties of Al2O3 Ceramic via 3D Stereolithography

Rheology and processing of UV‐curable textured alumina inks for additive manufacturing

Principles of Dispersing Powders for 3D Printing

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