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Additive Manufacturing of Ceramic Structures by Laser Engineered net shaping

Chinese Journal of Mechanical Engineering 2015年第6期28卷 1117-1122页

作者： NIU Fangyong WU Dongjiang MA Guangyi ZHANG Bi Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education Dalian University of Technology Department of Mechanical Engineering University of Connecticut

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 Al2O3 ceramic structures is conducted by laser engineered net shaping system and pure ceramic powders. Grain refinement strengthening method by doping Zr O2 and dispersion strengthening method by doping Si C are proposed to suppress cracks in fabricating Al2O3 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-Al2O3 and t-Zr O2 are obtained in the fabricated specimens. Micro-hardness higher than 1700 HV are also achieved for both Al2O3 and Al2O3/Zr O2, 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.

关键词： lasers net shaping alumina ceramics additive manufacturing

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