Journal ArticleDOI
Laser stereolithography of ZrO2 toughened Al2O3
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TLDR
In this article, an acrylic modified zircon loaded with alumina powders is used as organic photoactivated resin and allows the dispersion of a high volume fraction of Al2O3 powder (up to 50 vol%) while keeping viscosity at reasonable low values.Abstract:
Ceramic laser stereolithography is a manufacturing process suitable candidate for the production of complex shape technical ceramics. The green ceramic is produced layer by layer through laser polymerisation of UV curable ceramic suspensions. A number of critical issues deserve attention: high solid loading and low viscosity of the suspensions, high UV reactivity, prevention of interlayer delamination in the green and in the sintered body, good mechanical performance. In this work, ZrO2 reinforced Al2O3 components have been obtained from an acrylic modified zircon loaded with alumina powders. The zircon compound is effective as organic photoactivated resin and allows the dispersion of a high volume fraction of Al2O3 powder (up to 50 vol.%) while keeping viscosity at reasonable low values. The zircon compound also represents a liquid ceramic precursor that converts to oxide after burning out of the binder. Thanks to the good dispersion of the alumina powder in the zircon acrylate, a uniform dispersion of ZrO2 submicron particles is obtained after pyrolysis. These are located at the grain boundaries between alumina grains. Formation of both monoclinic and tetragonal ZrO2 occurs as evidenced by XRD. No delamination occurs in bending tests as evidenced by SEM fractography, satisfactory modulus and strength values were concurrently found.read more
Citations
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A review on stereolithography and its applications in biomedical engineering
TL;DR: Stereolithography is a solid freeform technique (SFF) that was introduced in the late 1980s as mentioned in this paper, and it has been widely used in biomedical applications, as well as the biodegradable resin materials developed for use with stereolithography.
A review on stereolithography and its applications in biomedical engineering
TL;DR: Stereolithography is a solid freeform technique (SFF) that was introduced in the late 1980s as discussed by the authors, which has the highest fabrication accuracy and an increasing number of materials that can be processed is becoming available.
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Additive manufacturing of advanced ceramic materials
TL;DR: A detailed review of the current state-of-the-art in additive manufacturing of advanced ceramics can be found in this article, with an emphasis on reported results in terms of final density, surface finish and mechanical properties.
Journal ArticleDOI
Recent advances in 3D printing of porous ceramics: A review
TL;DR: In this paper, 3D printing technology is evaluated for its compatibility with porous ceramic materials, due to its competitive process in terms of speed and specific tooling, especially for good quality fabrication.
Journal ArticleDOI
Fabrication of a bio‐inspired beta‐Tricalcium phosphate/collagen scaffold based on ceramic stereolithography and gel casting for osteochondral tissue engineering
TL;DR: In this paper, a bio-inspired design of osteochondral β-tricalcium phosphate/collagen scaffolds with bioinspired design by CSL and gel casting is presented.
References
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Journal ArticleDOI
Freeform Fabrication of Ceramics via Stereolithography
TL;DR: In this paper, three types of materials were investigated: silica for investment casting, alumina and silicon nitride for structural parts, and three-dimensional objects were fabricated from a 0.50 volume fraction silica suspension.
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Fracture Toughness of Al2O3 with an Unstabilized ZrO2Dispersed Phase
TL;DR: The fracture toughness of Al2O3 is considerably increased by the incorporation of fine monoclinic ZrO2 particles in hot-pressed composites as mentioned in this paper, and the increase results from a high density of small matrix micro cracks absorbing energy by slow propagation.
Journal ArticleDOI
Crack growth resistance of alumina, zirconia and zirconia toughened alumina ceramics for joint prostheses.
TL;DR: A new generation of alumina-zirconia nano-composites having a high resistance to crack propagation, and as a consequence may offer the option to improve lifetime and reliability of ceramic joint prostheses.
Journal ArticleDOI
Intrinsic size dependence of the phase transformation temperature in zirconia microcrystals
R. C. Garvie,M. F. Goss +1 more
TL;DR: In this article, it was argued that the tetragonal to monoclinic transformation in zirconia is exothermic, which guarantees that the surface free energy of the former is less than that of the latter structure.
Journal ArticleDOI
Solid freeform fabrication
TL;DR: In this paper, solid freeform fabrication (SFF) is used to produce accurate, structurally sound 3D renditions of objects designed with computers and manufactured directly from a CAD database, without part-specific tooling or human intervention.