Johansson Emil, Lidström Oscar, Johansson Jan, Lyckfeldt Ola, Adolfsson Erik
Swerea IVF, Argongatan 30, 431 22 Mölndal, Sweden.
Materials (Basel). 2017 Feb 8;10(2):138. doi: 10.3390/ma10020138.
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.
立体光刻（SL）是一种通过对包含光固化单体、光引发剂和陶瓷粉末的光固化悬浮液进行选择性光聚合来增材制造复杂陶瓷部件的技术。制造出的三维物体经过清洗，并通过聚合物网络的热脱脂及随后的烧结转化为致密的陶瓷部件。脱脂是最关键且耗时的步骤，并且常常是产生裂纹的根源。在本研究中，已开发出光固化氧化铝悬浮液，并研究了树脂组成对缺陷形成的影响。对悬浮液的流变学和固化行为进行了表征，通过扫描电子显微镜（SEM）对由SL制造的烧结试样的横截面进行了评估。结果发现，向光固化树脂中添加非反应性成分可降低聚合收缩并改变聚合物基体的热分解，从而减少分层和层内裂纹。使用分解而非蒸发的非反应性成分会使残余孔隙率更低。
