The European Ceramic Society

News

Dec 14, 2022

YCN Newsletter 15 : "Exploring the wonders and the nightmares of binder jetting!" by Marco Mariani

Binder jetting of ceramic-based materials is a growing and interesting field of research.

 As other indirect additive manufacturing techniques, binder jetting comprises a shaping phase (the actual 3D printing) obtained by binding of the feedstock with a liquid agent, followed by a series of thermal treatments promoting sintering. However, the main difference stands in the use of dry particles to form a powder bed, which leads to a series of advantages as complete design freedom, high process throughput and material versatiliy. On the other side, green density is usually low, which may hinder complete densification of the printed parts.

In my research path at Politecnico di Milano, I'm tackling with all the challenges related with the production of structural and functional ceramics, as alumina, piezoelectric alloys and cemented carbides. It is fascinating to observe how material composition, printing parameters and sintering conditions contribute synergically to the densification mechanisms and the final properties of the printed components.

Alumina cannot be fully densified by conventional means, but the technique as demonstrated the possibility of realising complex geometries with minimal effort, which could fit the production of catalyst supports, membrane, filters and so on. Various feedstock can be employed, as dense or granulated materials, leading to different features and distributions of the internal porosities.

Similar issues were observed with piezoceramics as KNN and PZT. In this case, strategies to control the residual porosity are being developed, with the aim of tuning the piezoelectric performances of the material. Indeed, porous piezoceramics are of great interest to many industrial sectors, and the possibility of producing complex geometries would be an invaluable advantage.

Cemented carbides, as WC in cobalt matrix, are materials designed for sintering processes, so their densification is rather simple. It was possible to achieve full density (>99%) and produce intricate designs typical of the industry with mechanical properties on par with the minimal standards required.

In conclusion, the versatility and the advantages of binder jetting make it an interesting option for manufacturing of complex-shaped ceramics. In the three years of my PhD project, I had the chance of working on many different topics and problems still to be solved, in collaboration with amazing friends from ISSMC of Faenza and CSIC-ICV of Madrid and many projects are on the horizon!

         

Figure 1 Components printed by binder jetting

          

Marco Mariani

Department of Mechanical Engineering

Politecnico di Milano

Milano (Italy)

Marco.mariani@polimi.it 

Last news

Jun 13, 2024
Next deadline for the JECS Trust mobility Grant is 31st August 2024!

Please note that the decisions of the JECS Trust board will not be known before Mid-October 2024 and so the project submitted must not begin before mid-November 2024.

Jun 10, 2024
2024 ECerS International Ceramist Student Exchange Program – 3rd call!

In the frame of the 2024 ECerS International Student exchange program, ECerS is opening a third call, this time to allow grants to European Students to attend the 2024 Fall meeting of Korean Ceramic Society (COEX) that will be organised by the Korean Ceramic Society in Seoul, Korea, from 16th to 18th October 2024.

Information

Contact us for any information: info@ecers.org - We will respond to your inquiry as soon as possible.

Newsletter

Subscribe to our newsletter and receive our latest news.

Our actions

ECerS coordinates and promotes the study of ceramics through the following actions :

ECerS office

Av. Gouverneur Cornez , 4

7000 Mons

Belgium

Useful links