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Meeting Materials Science & Technology 2020
Symposium Manufacturing and Processing of Advanced Ceramic Materials
Presentation Title Fabricating Alumina with Heterogeneous Microstructure Using Integrated Additive/Subtractive Manufacturing (IASM)
Author(s) Xiao Geng, Jincheng Lei, Shenglong Mu, Hai Xiao, Jianhua Tong, Rajendra K. Bordia, Fei Peng
On-Site Speaker (Planned) Fei Peng
Abstract Scope Fabricating ceramics with heterogeneous microstructure enables novel properties of materials. To precisely control the ceramic’s microstructure, we build a system of integrated additive/subtractive manufacturing (IASM). In this system, we use the picosecond (PS) laser for localized micromachining, and a CO2 laser for selective sintering at precisely controlled positions. We demonstrate the approach of laser sintering of alumina with “brick-mortar” structure. After extrusion of each layer, a PS laser was used to create a pattern in this layer. A CO2 layer was then used to sinter this layer. The “brick-mortar” structure was thus achieved layer-by-layer. The PS laser patterning not only creates the unit cells in each layer, but also releases the stress during the CO2 laser sintering, resulting in crack-free unit cells. With the control of CO2 layer power and scanning speed, we can control the density gradient along the vertical direction and bonding between the layers.


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