Digital light processing fabrication of mullite component derived from preceramic precusor using photosensitive hydroxysiloxane as the matrix and alumina nanoparticles as the filler

Additive Manufacturing of Advanced Ceramics Using Preceramic Polymers

“…The choice of photoinitiators plays an essential role in vat photopolymerization where selection depends on the specific resin and printing conditions [ 84 ]. Literature search results indicate that diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO), ethyl phenyl(2,4,6-trimethylbenzoyl)phosphinate(TPO-L), and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (BAPO) are commonly used as photoinitiators for preceramic materials [ 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 ], and Figure 7 a illustrates their chemical structures. TPO, TPO-L, and BAPO belong to the Norrish type I category, which can effectively generate free radicals through homolytic cleavage of their C-O or C-N bonds upon exposure to light radiation [ 82 ].…”

EVA-PVA binder system for polymer derived mullite made by material extrusion based additive manufacturing

“…These polymeric compounds release gas byproducts while crosslinking followed by pyrolysis at higher temperatures to obtain an amorphous ceramic residue [12]. Fabrication of PDC structures have been demonstrated by various additive manufacturing techniques such as direct ink writing (DIW) [13,14], stereolithography [15], digital light processing (DLP) [16,17], selective laser sintering [18], material extrusion based additive manufacturing (MEX-AM) [19,20], etc [21]. Although DIW is a good candidate for printing simple geometries, fabrication of more complex geometries, overhangs, bridging or achieving high resolution is still a big challenge even by tailoring the rheological properties of the ink.…”

“…Although DIW is a good candidate for printing simple geometries, fabrication of more complex geometries, overhangs, bridging or achieving high resolution is still a big challenge even by tailoring the rheological properties of the ink. DLP method is limited to the fabrication of thin and small structures [16,17] and with SLS only a low relative density of 90% for SiC ceramics could be achieved after 7 times polymer infiltration and pyrolysis (PIP) post-treatment [18]. Using MEX-AM method, closed porosity appeared in sintered parts [22].…”

Effect of sintering temperature on microstructure and properties of 3D printing polysilazane reinforced Al2O3 core

“…In recent years, ceramic precursors have been added to ceramic slurries to achieve increased ceramic content of cores after sintering while with little impact on the printability of stereolithography 3D printing [16,17] . Through the addition of precursors into ceramics, the thermomechanical properties of ceramics can be improved without adding sintering additives [17] .…”

“…In recent years, ceramic precursors have been added to ceramic slurries to achieve increased ceramic content of cores after sintering while with little impact on the printability of stereolithography 3D printing [16,17] . Through the addition of precursors into ceramics, the thermomechanical properties of ceramics can be improved without adding sintering additives [17] . He et al [17,18] added SiO 2 powders to epoxy acrylate siloxane to increase the ceramic content of photocured polysiloxane (PSO) precursor to solve the contradiction between high solid content and printing difficulty.…”