Direct ink writing of Si2N2O porous ceramic strengthened by directional β-Si3N4 grains

Robocasting of advanced ceramics: ink optimization and protocol to predict the printing parameters - A review

“…In fact, the fast solvent evaporation of the colloidal suspension in ambient conditions may cause both clogging during printing with fine nozzles in a low humidity setting and crack formation after printing. In order to mitigate such a problem, attention has been raised toward the use of gel-embedded suspensions (aqueous hydrogel-forming ink) or combined inks comprising both aqueous and non-volatile hydrophilic co-solvents [ 65 ]. The easy and fast processing of gel-embedded suspensions results in stable suspensions as the rheological properties depend on the gel properties rather than particle-particle interactions.…”

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Figure 3 Optical images of geometrically complex B 4 C printed ceramic parts using robocasting: a) green and dried B 4 C parts shaped by robocasting, b) in situ image of complex circular gear during printing adapted with permission from [ 55 ]. Optical images of Si 3 N 4 printed structures using robocasting: c) cellular structure and d) honeycomb structure adapted with permission from [ 65 ].

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Additive manufacturing of silicon nitride ceramics: A review of advances and perspectives

“…In addition to the previous research reports, there are also some reports on Si 3 N 4 related materials by DIW. Jin et al 72 fabricated three complex-shaped porous Si 2 N 2 O ceramics strengthened by directional β-Si 3 N 4 using DIW, as shown in Figure 7D (reproduced with permission from Ref. [72] 2020 Elsevier).…”

“…Jin et al 72 fabricated three complex-shaped porous Si 2 N 2 O ceramics strengthened by directional β-Si 3 N 4 using DIW, as shown in Figure 7D (reproduced with permission from Ref. [72] 2020 Elsevier). The mechanical properties of the as-prepared composite were greatly improved due to the addition of high-aspect-ratio β-Si 3 N 4 grains.…”

“…Fortunately, the research on the AM of Si 3 N 4 ceramic has received more and more attentions recently, and attempts have been on the rise. AM technologies of Si 3 N 4 ceramics mainly include (1) powder bed fusion (including selective laser sintering [SLS], and selective laser melting [SLM], 43–49 and so on), (2) photopolymerization (usually including stereolithography apparatus [SLA], 50 laser‐induced slip [LIS] casting, 51 digital light processing [DLP], 52–65 liquid crystal display [LCD], 66,67 and so on); (3) material extrusion (usually including direct ink writing [DIW] or robocasting, 68–74 fused deposition modeling [FDM], 75–79 and so on); and (4) other AM technologies (including binder jetting [BJ], 80–85 3DP, 86–89 and laminated object manufacturing [LOM] 90–94 ). Schematics of the previous AM technologies for Si 3 N 4 ceramic are illustrated in Figure 2.…”