About this Abstract |
| 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. |