Microstructural Evolution in α-Al2O3 Compacts During Laser Irradiation

Власова, М.; Kakazey, M.; Aguilar, P.A. Márquez

doi:10.5772/23196

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2014

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“…Two of such methods are laser sintering and laser synthesis [7][8][9][10][11]. A layered synthesis is of particular interest, often referred to as a 3d-laser synthesis [12,13]. To date, the physical and chemical processes occurring in the hightemperature radiation zone of powder mixtures are not well understood.…”

Section: Introductionmentioning

confidence: 99%

Layer-by-layer laser synthesis of composite ceramics in the system Al-Ti-Y-O

Власова¹,

Kakazey²,

Juarez‐Arellano³

et al. 2014

MRS Proc.

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The phase composition and the microstructure of multilayer ceramics synthesized by directed laser treatment of ternary powder mixtures of Al 2 O 3 -TiO 2 -Y 2 O 3 have been studied. It is established that at R = 2.34 (where R is TiO 2 /Y 2 O 3 in mol %) the main phases observed are Y 2 Ti 2 O 7 , -Al 2 O 3 and a little amount of β-Al 2 TiO 5 . The content of the formed phases is determined by the composition of the initial mixtures. The texture of the surface and the microstructure of the formed ceramics depend on the -Al 2 O 3 and Y 2 Ti 2 O 7 content. Increasing the content of alumina in the initial mixtures, the surface of the ceramics is saturated by -Al 2 O 3 crystallites. When a multi-layer synthesis is realized, the Y 2 Ti 2 O 7 phase is concentrated at the boundary between the two adjacent layers (top and bottom). In the underlying layer, the growth of the corundum crystallites is prolonged due to the additional heating.

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