Study of Selective Laser Gelling for Rapid Prototyping Technology
Date Issued
2009
Date
2009
Author(s)
Liu, Fwu-Hsing
Abstract
ABSTRACTitle：Study of Selective Laser Gelling for Rapid Prototyping Technologychool：National Taiwan University esearcher：Liu, Fwu Hsing Advisor：Liao, Yunn Shiuaneywords：Rapid prototyping, Laser gelling, Ceramic, Metal-ceramic compositesn this study, a selective laser gelling (SLG) and metal-ceramic composites of rapid prototyping process is developed. Therefore, two RP apparatus systems with the CO2 and Nd:YAG laser are also developed. These RP systems are composed of a laser scanning system, a paving system, and a control system. The laser scan system comprises a laser machine and a laser scan head, the paving system comprises an elevator platform and a scraper mechanism, the control system edited by the VB language administers the laser and paving systems to implement the layer additive process via control cards and the human-machine interface (HMI). n the SLG process, the silica sol and silica powder is mixed as the ceramic slurry and then is paved to form a thin layer. When a laser beam radiation on the slurry, the gelling reaction is yielded after the water is evaporated. The low cost parts with pure ceramic composition can be rapidly fabricated. The part strength and dimensional accuracy can be increased using suitable bonding overlap, a complex shaped part with inner channel structures can be build by generating multi-length pillared support, which has the potential to construct the bio-ceramic for bone tissue scaffolds . Furthermore, in metal-ceramic composites process, the metal powder and ceramic binder is mixed as raw materials and then is heated by a Nd:YAG laser beam. The metal powder is wrapped by the ceramic binder to form a metal-ceramic part that is a novel method for fabrication composite materials.he construction method of the RP apparatus and the building procedure of ceramic and metal-ceramic part are explained in this paper. The materials ingredient, paving method, process parameters, laser energy density, the overlap relation of gelled ceramic, and the generating strategy of support structure are also discussed. In order to enhance the application fields in industry of this research, the accuracy of work pieces, the roughness of surface, bending strength, feature of surface, and the ingredient of construction will be measured.
Subjects
Rapid prototyping
Laser gelling
Ceramic
Metal-ceramic composites
Type
thesis
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