A strategy for defects healing in 3D printed ceramic compact via cold isostatic pressing: Sintering kinetic window and microstructure evolution

Abstract

In this study, we developed a unique defect healing method for 3D printed ceramic compact via cold isostatic pressing (CIP) after debinding, and typical features of interlayer interface defects of 3D-printed zirconia compact were characterized and found to be reduced significantly. The characteristic sintering kinetics window and microstructure evolution of the healed sintered bodies were systematically investigated, which was found to be quite different from conventional shaping methods. The three sintering stages are probed by their feature microstructure details such as the mechanically flattening surface at the early sintering stage, the heterogeneous microstructure and high porosity in the interlayer interface region at the middle stage, and the slightly ripple-like structural features combined with the healed interlayer defects at the final stage. The evolution of the pore structure of the healed 3D printed bodies were traced and the mechanical properties such as the Young's modulus, hardness, and fracture toughness were measured to understand the significance of the heal effect. K E Y W O R D S3D printing, defects, kinetics, sintering Di An and Wei Liu contributed equally to this work.

3D printing of dense structural ceramic microcomponents with low cost: Tailoring the sintering kinetics and the microstructure evolution

“…Hence, it is confirmed that it is 1250°C at which open pores disappear and the boundary of the 2nd and the 3rd sintering stage. Furthermore, interlayer defects could be healed in the following sintering stage due to the RD of 95.43% is obtained at 1300°C …”

Effect of TiN content on properties of NiFe2O4‐based ceramic inert anode for aluminum electrolysis

“…Sintering is a complex process and could be principally divided into three stages, that is, the initial, intermediate, and final stages of sintering 22 . Sintering activation energy of initial stage is extremely significant to understand the sintering mechanism.…”

“…Sintering is a complex process and could be principally divided into three stages, that is, the initial, intermediate, and final stages of sintering. 22 Sintering activation energy of initial stage is extremely significant to understand the sintering mechanism. In this study, on basis of the researches of Bannister, 23 Keski and Cutler, 24 and Woolfrey and Bannister, 25 sintering activation energy of initial stage is calculated according to the linear shrinkage of initial stage.…”

Microstructure refinement-homogenization and flexural strength improvement of Al2O3 ceramics fabricated by DLP-stereolithography integrated with chemical precipitation coating process

“…Works by Santoliquido et al [17] and Shuai et al [18] have detailed the use of DLP-stereolithography for the fabrication of Al 2 O 3 architectures with fine and complex lattice structures. However, it is worth noting that the presence of photosensitive resin in printed green parts and its removal during the debinding process can result in a large porosity in the debound parts [19], which can lengthen the pathways for substance migration at high temperatures and be an obstacle for the sintering densification [20,21]. For this reason, an increased sintering temperature is required for the debound samples to form dense ceramic parts.…”