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Article

Impact of Polymer Binders on the Structure of Highly Filled Zirconia Feedstocks

1
Ingénierie des Matériaux Polymères, Univ Lyon, Université Lyon 1, CNRS UMR 5223, 15 Boulevard Latarjet, 69622 Villeurbanne CEDEX, France
2
Saint-Gobain CREE, Grains et Poudres, 550 Avenue Alphonse Jauffret, BP 20224, 84306 Cavaillon, France
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(10), 2247; https://doi.org/10.3390/polym12102247
Received: 7 September 2020 / Revised: 25 September 2020 / Accepted: 28 September 2020 / Published: 29 September 2020
(This article belongs to the Special Issue Polymer/Ceramics Composites)
The impact of polypropylene and high-density polyethylene backbone binders on the structure of organic matrix, feedstock, and ceramic parts is investigated in terms of morphology in this paper. The miscibility of wax with polyethylene and polypropylene is investigated in the molten state via a rheological study, revealing wax full miscibility with high-density polyethylene and restricted miscibility with polypropylene. Mercury porosimetry measurements realized after wax extraction allow the characterization of wax dispersion in both neat organic blends and zirconia filled feedstocks. Miscibility differences in the molten state highly impact wax dispersion in backbone polymers after cooling: wax is preferentially located in polyethylene phase, while it is easily segregated from polypropylene phase, leading to the creation of large cracks during solvent debinding. The use of a polyethylene/polypropylene ratio higher than 70/30 hinders wax segregation and favors its homogeneous dispersion in organic binder. As zirconia is added to organic blends containing polyethylene, polypropylene, and wax, the pore size distribution created by wax extraction is shifted towards smaller pores. Above zirconia percolation at 40 vol%, the pore size distribution becomes sharp attesting of wax homogeneous dispersion. As the PP content in the organic binder decreases from 100% to 0%, the pore size distribution is reduced of 30%, leading to higher densification ability. In order to ensure a maximal densification of the final ceramic, polyethylene/polypropylene ratios with a minimum content of 70% of high-density polyethylene should be employed. View Full-Text
Keywords: polymer binder; zirconia feedstocks; ceramic density polymer binder; zirconia feedstocks; ceramic density
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MDPI and ACS Style

Delaroa, C.; Fulchiron, R.; Lintingre, E.; Buniazet, Z.; Cassagnau, P. Impact of Polymer Binders on the Structure of Highly Filled Zirconia Feedstocks. Polymers 2020, 12, 2247. https://doi.org/10.3390/polym12102247

AMA Style

Delaroa C, Fulchiron R, Lintingre E, Buniazet Z, Cassagnau P. Impact of Polymer Binders on the Structure of Highly Filled Zirconia Feedstocks. Polymers. 2020; 12(10):2247. https://doi.org/10.3390/polym12102247

Chicago/Turabian Style

Delaroa, Claire, René Fulchiron, Eric Lintingre, Zoé Buniazet, and Philippe Cassagnau. 2020. "Impact of Polymer Binders on the Structure of Highly Filled Zirconia Feedstocks" Polymers 12, no. 10: 2247. https://doi.org/10.3390/polym12102247

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