Preparation of Thick Ceramic Coating by Laser Multi-Layer Cladding II - Microstructural Characteristics

Dong Sheng Wang; Zong Jun Tian; Li Da Shen; Yin Hui Huang

doi:10.4028/www.scientific.net/AMR.785-786.901

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 785-786Preparation of Thick Ceramic Coating by Laser...

Preparation of Thick Ceramic Coating by Laser Multi-Layer Cladding II - Microstructural Characteristics

Abstract:

In this study, thick ceramic coatings were fabricated by laser multi-layer cladding with Al₂O₃-13%TiO₂ nanostructured agglomerated powders based on series of crack control of clad layer. The microstructural characteristics and microhardness of the coating were investigated by using scanning electron microscopy (SEM) and microhardness measurement. The results show that the laser-clad thick ceramic coating has no obvious interface between the layers with dense, continuous structure, and almost no pores and free of large penetrating cracks. The ceramic layer is composed of fully melted regions (fine equiaxed grains) and partially melted regions (remained nanoparticles). In addition, the most microcracks in the coating are focus on the partially melted region. The grain size of ceramic coating in the depth direction is gradually increased, while the hardness along depth direction is gradually decreased.

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Periodical:

Advanced Materials Research (Volumes 785-786)

Pages:

901-905

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.785-786.901

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Online since:

September 2013

Authors:

Dong Sheng Wang, Zong Jun Tian, Li Da Shen, Yin Hui Huang

Keywords:

Laser Cladding, Microhardness, Microstructure, Multi-Layer Cladding, Thick Ceramic Coating

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