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论文类型：期刊论文

发表时间：2015-03-16

发表刊物：RAPID PROTOTYPING JOURNAL

收录刊物：SCIE、EI、Scopus

卷号：21

期号：2,SI

页面范围：201-206

ISSN号：1355-2546

关键字：Ceramics; Lasers; Additive manufacturing; Alumina; Net shaping

摘要：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.