Effect of SiC particles on crack susceptivity in laser direct forming Al<sub>2</sub>O<sub>3</sub>ceramic

Dongjiang, 吴东江 Wu; Ce, 杨策 Yang; Nan, 吴楠 Wu; Yu-quan, 郭玉泉 Guo; Ma, Guangyi; Dongming, 郭东明 Guo

doi:10.3788/ope.20122007.1551

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“…Through systematic optimization of process parameters, deposition by the mixed ratio of 10 wt.% SiC/90 wt. % Al 2 O 3 shows fewer cracks than other mixed ratios [30] . Fig.…”

Section: Resultsmentioning

confidence: 81%

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Additive manufacturing of ceramic structures by laser engineered net shaping

Niu

et al. 2015

Chin. J. Mech. Eng.

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Ceramic is an important material with outstanding physical properties whereas impurities and porosities generated by traditional manufacturing methods limits its further industrial applications. In order to solve this problem, direct fabrication of Al 2 O 3 ceramic structures is conducted by laser engineered net shaping system and pure ceramic powders. Grain refinement strengthening method by doping ZrO 2 and dispersion strengthening method by doping SiC are proposed to suppress cracks in fabricating Al 2 O 3 structure. Phase compositions, microstructures as well as mechanical properties of fabricated specimens are then analyzed. The results show that the proposed two methods are effective in suppressing cracks and structures of single-bead wall, arc and cylinder ring are successfully deposited. Stable phase of α-Al 2 O 3 and t-ZrO 2 are obtained in the fabricated specimens. Micro-hardness higher than 1700 HV are also achieved for both Al 2 O 3 and Al 2 O 3 /ZrO 2 , which are resulted from fine directional crystals generated by the melting-solidification process. Results presented indicate that additive manufacturing is a very attractive technique for the production of high-performance ceramic structures in a single step.

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“…Through systematic optimization of process parameters, deposition by the mixed ratio of 10 wt.% SiC/90 wt. % Al 2 O 3 shows fewer cracks than other mixed ratios [30] . Fig.…”

Section: Resultsmentioning

confidence: 81%

“…Therefore, when a propagating crack encounters the SiC particles, more propagation energy will be consumed, and consequently the cracks will change direction or be restrained, as shown in Figs. 10(b), (c) and (d) [30] . …”

Section: Resultsmentioning

confidence: 99%