Formation mechanism and quantitative analysis of pores in Al2O3–ZrO2 ceramic different structures by laser additive manufacturing

Advances and challenges in direct additive manufacturing of dense ceramic oxides

“…Furthermore, the shrinkage pore defects primarily arise from the excessive volume shrinkage of the solid phase at the final stage of solidification, leaving insufficient time for the liquid to fill the resulting vacancies. These irregular pores are predominantly concentrated in the rapid quenching region at top of dAMed ceramic specimens [140,157,192,193], as shown in figure 14(c). Also, this defect was frequently observed at grain boundary due to inadequate liquid filling (figure 14(d)), and such occurrences can easily lead to the initiation and propagation of intergranular cracks under thermal tensile stress, as documented in previous works [33,142,152].…”

“…All rights reserved. (c) Reprinted from [193], © 2023 Elsevier Ltd and Techna Group S.r.l. All rights reserved.…”

Morphology and formation mechanism of cracks in Al2O3–ZrO2 eutectic ceramics fabricated via laser powder bed fusion

“…[1][2][3][4][5] Al 2 O 3 -ZrO 2 ceramic composites, which have excellent high-temperature stability, creep resistance, and oxidation resistance, are widely regarded as materials with considerable potential for manufacturing hightemperature resistant components. [6][7][8][9][10] However, it is challenging to produce complex Al 2 O 3 -ZrO 2 parts based on traditional manufacturing processes, especially to control the shape, size, and precision. [11][12][13][14][15][16] Laser powder bed fusion (LPBF) is an additive manufacturing technology that has been widely implemented due to its ability to produce high-precision, densely packed parts in various fields, such as metals, polymers, [17][18][19][20] and ceramics.…”

“…High‐temperature structural materials are critical in these applications as they must maintain their mechanical strength, fatigue resistance, and creep resistance under extreme temperature conditions 1–5 . Al 2 O 3 –ZrO 2 ceramic composites, which have excellent high‐temperature stability, creep resistance, and oxidation resistance, are widely regarded as materials with considerable potential for manufacturing high‐temperature resistant components 6–10 . However, it is challenging to produce complex Al 2 O 3 –ZrO 2 parts based on traditional manufacturing processes, especially to control the shape, size, and precision 11–16 …”