Preparation of Ti2AlC through in-situ selective laser forming and reaction sintering. Issue 16 (15th August 2021)

• Record Type: Journal Article
• Authors: Li, Jun; Shao, Huang; Liu, Tingting; Zhang, Kai; Yan, Zhilong; Liao, Wenhe
• Is Part Of: Ceramics international. Volume 47:Issue 16(2021)
• Page Start: 22356
• Page End: 22364
• Publication Date: 2021-08-15
• Subjects: In-situ selective laser forming -- Reaction sintering -- Ti2AlC -- Phase composition -- Microstructure; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.03.246
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: This paper proposes the preparation of Ti2 AlC complex parts through the combination of in-situ selective laser forming (ISLF) and reaction sintering. By studying the impaction of scan speed and laser power on the phase composition and microstructure of the formed test specimen, it was found that the test specimen mainly consisted of Ti3Al, TiAl, TiC, and graphite reacted incompletely. When the laser power was fixed, the lower the scan speed, the higher the TiC content. The TiC phase developed from nanoparticles to coarse dendritic structures gradually. When the laser power is further increased, the dendritic structure does not increase significantly. The process optimization found that when the laser power was 40 W and the scan speed was 100 mm/s, the density of the formed test specimen was 80.308%, which was mainly because the difference between the diffusion coefficients of Ti and Al resulted in Kirkendall pores, causing the incomplete densification of the formed part.