Impact of debinding atmosphere and sintering additives on the fabrication of alumina ceramics via vat photopolymerization

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-03-01 DOI:10.1016/j.ceramint.2024.12.336

P.L.A. Alves , I.L. Camargo , J.R. Verza , A.P. Luz

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Abstract

Vat photopolymerization of ceramic suspensions has received considerable attention due to its high precision and exceptional resolution, enabling the fabrication of intricate ceramic components. However, the polymer-based network formed during the printing process must be heated gradually to ensure the efficient release of gases generated from the decomposition of organic compounds, thereby preventing the formation of cracks in the ceramic structure. An alternative strategy to achieve ceramics with optimal properties is the incorporation of sintering additives into the compositions, which reduces the sintering temperature while enhancing densification of the parts during thermal treatments. This study examines the influence of debinding atmosphere (air or N₂) and sintering additives (TiO₂ and Nb₂O₅) on the fabrication of alumina ceramics using digital light processing, employing a commercially available, cost-effective, bottom-up LCD printer. Optimized debinding in an inert (N₂) atmosphere produced crack-free components with improved densification after sintering at 1400 °C and 1600 °C. Both additives were effective in altering the sintering behavior of alumina, increasing diffusion rates and promoting the formation of intergranular phases. As a result, specimens with a relative density of approximately 97.5 % were achieved.

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.