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PhD - Ceramic formulations for novel hybrid 3D printers

ABG-78644 Sujet de Thèse
12/06/2018 > 35 et < 45 K€ brut annuel
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Belgian Ceramic Research Centre
Mons - Belgique
PhD - Ceramic formulations for novel hybrid 3D printers
  • Sciences de l’ingénieur
  • Chimie
3D Printing, hybrid manufacturing, binder jetting, ceramics

Description

3D printing (3DP) or binder jetting of ceramics creates solid objects from a CAD representation by selective binding particulate materials with binder droplets. Although earlier work has demonstrated the effectiveness and flexibility of 3DP as a rapid prototyping tool, the approach is still limited in terms of attainable densities and finish surface. 3DP like other powder-based AM techniques requires a flowable powder typically of a spherical shape and of size above 20 μm. But due to this large particle size and relatively low green density, sintering activity is poor and sintered densities of ceramic parts are usually below 90% of theoretical density.

In an attempt to circumvent these limitations, the BCRC has recently developed a new concept of hybrid subtractive/additive manufacturing system. The new approach relies on a modified binder jetting machine which integrates a slurry based deposition system and a laser. Instead of using a wiper to spread dried powders, the layers are formed by rastering a spray of ceramic slurry containing very fine powders over a building platform. A drying step removes the excess dispersing medium and a binder is then printed as in conventional 3DP to consolidate desired portions of the layer. Finally a pulsed laser is used to re-rough or re-fine the printed layer. The whole process is repeated layer after layer until the part is completely built up. The object is then carefully removed from the surrounding powder and sintered.

The aim of this work is to apply this new technology to the processing of Biphasic calcium phosphate (BCP) bioceramics composed of hydroxyapatite (HA) and β-tricalcium phosphate (β-TCP). These materials have been widely studied for their potential applications in orthopaedic and dental implants and as tissue scaffolds due to their excellent biocompatibility and tunable resorption. The hybrid technology will be used to elaborate various parts having well controlled porous structures and architectures. Four levels of architecture will be considered, namely surface topography, pore size and geometry, porous networks, and macroscopic pore arrangement, including spatially varied architecture.

Raw materials (powders and slurries) will be prepared in collaboration with UVHC while ceramic components will be elaborated and characterized at BCRC.

Nature du financement

Autre financement public

Précisions sur le financement

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 764935.

Présentation établissement et labo d'accueil

Belgian Ceramic Research Centre

The Belgian Ceramic Research Centre is a research, tests and analysis laboratory specialised in materials (research and development, analysis, certification, expertises), soils (geotechnics and sampling), and environment (sampling and analysis).

Today it combines the activities of two institutions:

The INISMa (INstitut Interuniversitaire des Silicates, Sols et Matériaux) which is a non-profit-making organisation which was founded in 1973 at the initiative of the Faculté Polytechnique de Mons, the Mons-Hainaut University, the Intermunicipal association IDEA, and a group of ceramics manufacturers (INS). The INISMa is involved in materials development and applications, soil survey and classification, and environmental challenges.

The CRIBC (Centre de Recherches de l’Industrie Belge de la Céramique) which is a collective research organisation which was created by Decree Law in 1948, under the de Groote's Law. The CRIBC supports the ceramics industry by carrying out applied research, providing technological guidance and monitoring, and by organising scientific and technical information for the benefit of its members.

Intitulé du doctorat

PhD in Materials Science

Pays d'obtention du doctorat

France

Etablissement délivrant le doctorat

Université de Valenciennes et du Hainaut-Cambrésis

Ecole doctorale

Profil du candidat

Knowledges in technical ceramic processing (slurry preparation, spray drying, sintering) and characterization.

Knowledge in additive manufacturing would be appreciated

Early-stage researchers (ESR) are those who are, at the time of recruitment by the host, in the first four years (full-time equivalent) of their research careers. This is measured from the date when they obtained the degree which formally entitles them to embark on a doctorate, either in the country in which the degree was obtained or in the country in which the research training is provided, irrespective of whether or not a doctorate was envisaged. That means typically, for European (or Worldwide) applicants, in the first four years after their Master degree.

Conditions of international mobility of researchers: Researchers are required to undertake trans-national mobility (i.e. move from one country to another) when taking up the appointment. At the time of selection by the host organisation, researchers must not have resided or carried out their main activity (work, studies, etc.) in the country of their host organisation for more than 12 months in the 3 years immediately prior to their recruitment. Short stays, such as holidays, are not taken into account.

English language: Network fellows (ESRs) must demonstrate that their ability to understand and express themselves in both written and spoken English is sufficiently high for them to derive the full benefit from the network training.

 

Date limite de candidature

07/07/2018
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