Effect of second-phase doping on laser deposited Al2O3 ceramics. Issue 2 (16th March 2015)

• Record Type: Journal Article
• Authors: Niu, Fangyong; Wu, Dongjiang; Ma, Guangyi; Zhou, Siyu; Zhang, Bi
• Is Part Of: Rapid prototyping journal. Volume 21:Issue 2(2015)
• Page Start: 201
• Page End: 206
• Publication Date: 2015-03-16
• Subjects: Ceramics -- Lasers -- Additive manufacturing -- Alumina -- Net shaping; Engineering design -- Periodicals; 620.004205
• DOI: 10.1108/RPJ-12-2014-0167
• Languages: English
• ISSNs: 1355-2546

Abstract

Abstract : Purpose: – The purpose of this paper is to investigate how a second-phase doping may affect Al2 O3 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 Y2 O3 powders are, respectively, doped into Al2 O3 powders at the eutectic ratio as second phases to improve the quality of a deposited part. The deposited Al2 O3, Al2 O3 /ZrO2 and Al2 O3 /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 Y2 O3 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 Al2 O3 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 Y2 O3 is good for improving laser-deposited Al2 O3 ceramic parts.