In this study, a method known as pre-wetting is applied between the multilayer ceramic investment casting shells to enhance porosity and permeability while sustaining flexural strength. Pre-wetting consists predominately of an aqueous silica binder that improves inter-coat bonding in complex areas. Porosity is developed where the pre-wetting is applied due to the evaporation of the aqueous phase. Results indicate that as porosity increases, both green and fired flexural strength reduce on average by 8.7 $-$ 15.6 % and 18.7 $-$ 28.5 %, respectively, whereas hot strength is increased by 20 $-$ 25 %. Permeability increased by a factor of two when pre-wetting was applied between intermediate coatings and displayed a stepwise increase in intrusion volume in the high-pressure regime through mercury intrusion porosimetry. X-ray microtomography coupled with pore network modelling provided a validation of the increase in the permeability constant. Gas adsorption methods revealed the presence of micropores through the alpha-s method when bilayers of pre-wetting solution were applied.

在这项研究中，一种称为预润湿的方法应用于多层陶瓷熔模铸造壳之间，以提高孔隙率和渗透率，同时保持抗弯强度。预润湿主要由水性二氧化硅粘合剂组成，可改善复杂区域的涂层间粘合。由于水相的蒸发，在进行预润湿的地方会产生孔隙。结果表明，随着孔隙率的增加，生坯和烧制弯曲强度平均降低 8.7$——$ 15.6% 和 18.7 $——$ 分别为 28.5 %，而热强度提高了 20 $——$25%。当在中间涂层之间应用预润湿时，渗透率增加了两倍，并且通过压汞孔隙率测定法在高压状态下显示出侵入量的逐步增加。X 射线显微断层扫描与孔隙网络建模相结合，验证了渗透率常数的增加。当应用预润湿溶液的双层时，气体吸附方法通过 alpha-s 方法揭示了微孔的存在。