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Influence of Resin Composition on the Defect Formation in Alumina Manufactured by Stereolithography

机译：树脂组成对立体光刻法生产氧化铝缺陷形成的影响

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Stereolithography (SL) is a technique allowing additive manufacturing of complex ceramic parts by selective photopolymerization of a photocurable suspension containing photocurable monomer, photoinitiator, and a ceramic powder. The manufactured three-dimensional object is cleaned and converted into a dense ceramic part by thermal debinding of the polymer network and subsequent sintering. The debinding is the most critical and time-consuming step, and often the source of cracks. In this study, photocurable alumina suspensions have been developed, and the influence of resin composition on defect formation has been investigated. The suspensions were characterized in terms of rheology and curing behaviour, and cross-sections of sintered specimens manufactured by SL were evaluated by SEM. It was found that the addition of a non-reactive component to the photocurable resin reduced polymerization shrinkage and altered the thermal decomposition of the polymer matrix, which led to a reduction in both delamination and intra-laminar cracks. Using a non-reactive component that decomposed rather than evaporated led to less residual porosity.
机译：立体光刻法（SL）是通过对包含光固化性单体，光引发剂和陶瓷粉末的光固化性悬浮液进行选择性光聚合，从而允许增材制造复杂的陶瓷零件的技术。清洁制造的三维物体，并通过聚合物网络的热脱脂和随后的烧结将其转变为致密的陶瓷零件。脱脂是最关键和最耗时的步骤，通常是裂纹的根源。在这项研究中，已开发出可光固化的氧化铝悬浮液，并研究了树脂组成对缺陷形成的影响。通过流变学和固化行为表征悬浮液，并通过SEM评估由SL制造的烧结样品的横截面。发现向光固化树脂中添加非反应性组分减少了聚合收缩并改变了聚合物基体的热分解，这导致层状裂纹和层内裂纹的减少。使用分解而不是蒸发的非反应性组分可减少残留孔隙率。

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