Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2015-03-16

Journal: RAPID PROTOTYPING JOURNAL

Included Journals: Scopus、EI、SCIE

Volume: 21

Issue: 2,SI

Page Number: 201-206

ISSN: 1355-2546

Key Words: Ceramics; Lasers; Additive manufacturing; Alumina; Net shaping

Abstract: Purpose - The purpose of this paper is to investigate how a second-phase doping may affect Al2O3 ceramic parts deposited by additive manufacturing (AM) with a laser-engineered net shaping system. Direct fabrication of engineering ceramic components by AM is a relatively new method for producing complex mechanical structures.
   Design/methodology/approach - In this study, ZrO2 and Y2O3 powders are, respectively, doped into Al2O3 powders at the eutectic ratio as second phases to improve the quality of a deposited part. The deposited Al2O3, Al2O3/ZrO2 and Al2O3/YAG (yttrium aluminum garnet) parts are examined for their micro-structures and micro-hardness, as well as defects.
   Findings - The experimental results show that doping of ZrO2 or Y2O3 as a second phase performs a significant role in suppressing cracks and in refining grains of the laser-deposited parts. The micro-hardness investigation reveals that the second-phase doping does not result in much hardness reduction in Al2O3 and the two eutectic ceramics are both harder than 1,500 Hv.
   Originality/value - The study concludes that the second-phase doping of ZrO2 and Y2O3 is good for improving laser-deposited Al2O3 ceramic parts.