Fine ceramic lattices prepared by extrusion freeforming

Yang, Hongyi; Yang, Shoufeng; Chi, Xiaopeng; Evans, Julian

doi:10.1002/jbm.b.30520

Cited by 80 publications

(69 citation statements)

References 37 publications

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“…A first publication reporting of RC, developed at Sandia National Labs in 1996 (U.S. Patent 6,027,326), was published by Cesarano et al [128] In original RC, a highly solid-loaded aqueous slurry close to dilatancy is cast onto a heated plate to induce a transition from a flowable slurry to a dilatant mass by drying to maintain the shape. [133,144] Further development led to utilizing colloidal gels with different rheological properties, which could retain the shape without drying. [145] These [169] [119,123,124,130,137,138,[140][141][142] Technique…”

Section: A Brief History Of Filament-based Writing Of Ceramicsmentioning

confidence: 99%

“…Therefore, particles are dispersed (mostly aided by electrosteric dispersants) in the solvent by agitation with shakers, ball mills, planetary mills or ultrasonic probes until homogeneity is achieved. [135,144,146,150] Then a polymeric viscosifier/binder is added to prevent sedimentation and solvent migration, to ensure consistent extrusion and to provide green strength. After complete dissolution of the viscosifier, the suspension can be degassed by vacuum [125] or centrifugation [139,140] and then filled into the cartridge.…”

Section: Feedstock Preparation and Propertiesmentioning

confidence: 99%

“…During sintering, EFF workpieces experience anisotropic shrinkage. [127,154,161] [123,124,133,142,144,146,148,150] …”

Section: Drying Binder Burnout and Sinteringmentioning

confidence: 99%

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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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Section: A Brief History Of Filament-based Writing Of Ceramicsmentioning

confidence: 99%

Section: Feedstock Preparation and Propertiesmentioning

confidence: 99%

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Additive Manufacturing of Ceramic‐Based Materials

et al. 2014

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“…To produce a fully interconnected porous PEEK, the produced PEEK/HA composite was further soaked into hydrochloric acid (HCl) solution so that the HA network could be removed by HCl etching. Solvent-based extrusion freeforming process, first developed by Evans and Yang's research group [15][16][17][18][19][20][21][22][23][24][25] , was used to print highly uniform HA 3D lattice structures with controlled filament/pore size. In solvent-based extrusion freeforming, solidification is based on solvent evaporation which has advantages over similar techniques such as robocasting, where the state changes based on a dilatant transition.…”

Section: Introductionmentioning

confidence: 99%

A novel bioactive PEEK/HA composite with controlled 3D interconnected HA network

Vaezi¹,

Yang²

2024

IJB

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Polyetheretherketone (PEEK) is a high-performance thermoplastic biomaterial which is currently used in a variety of biomedical orthopaedic applications. It has comparable tensile and compressive strength to cortical bone with favourable biocompatibility. However, natural grade PEEK-OPTIMA has shown insufficient bioactivity and limited bone integration. Bioactive PEEK composites (e.g., PEEK/calcium phosphates or Bioglass) and porous PEEK have been used to improve bone-implant interface of PEEK-based devices, but the bioactive phase distribution or porosity control is poor. In this paper, a novel method is developed to fabricate a bioactive PEEK/hydroxyapatite (PEEK/HA) composite with a unique configuration in which the HA (bioactive phase) distribution is computer-controlled within a PEEK matrix. This novel process results in complete interconnectivity of the HA network within a composite material, representing a superior advantage over alternative forms of product. The technique combines extrusion freeforming, a type of additive manufacturing (AM), and compression moulding. Compression moulding parameters, including pressure, temperature, dwelling time, and loading method together with HA microstructure were optimized by experimentation for successful biocomposite production. PEEK/HA composites with a range of HA were produced using static pressure loading to minimise air entrapment within PEEK matrix. In addition, the technique can also be employed to produce porous PEEK structures with controlled pore size and distribution.

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“…Many approaches have been developed to obtain ceramic materials with a hierarchical porosity 1 , such as extrusion 2 or ice templating 3 . They typically involve the presence of a macro-or mesopore former that is removed by a heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Crystal Templating with Mutually Miscible Solvents: A Simple Path to Hierarchical Porosity

2014

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Abstract:Ice templating, a route where ice crystals are used to template macroporosity, has been used to process a variety of materials with one level of macropores. We demonstrate here a variant of ice templating based on the solidification of mutually miscible solvents. The solidification of different phases, each defined by their own size and morphology, provides a simple one-step processing route for materials with hierarchical porosity defined by up to three levels of macroporosity. These concepts are demonstrated with both ceramic (yttria-stabilized zirconia) and polymer (polyvinyl alcohol) materials.

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Fine ceramic lattices prepared by extrusion freeforming

Cited by 80 publications

References 37 publications

Additive Manufacturing of Ceramic‐Based Materials

Additive Manufacturing of Ceramic‐Based Materials

A novel bioactive PEEK/HA composite with controlled 3D interconnected HA network

Crystal Templating with Mutually Miscible Solvents: A Simple Path to Hierarchical Porosity

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