Ceramics-Silikáty 57 (4) 285-289 (2013)

KINETICS OF GRAIN-GROWTH OF YTTRIUM ALUMINUM GARNET FIBERS PREPARED BY SOL-GEL METHOD

The yttrium aluminum garnet (YAG) long fibers were prepared by the sol-gel method using aluminum chloride, aluminum powder, yttrium oxide and acetic acid as raw materials. The grain growth law is given by Dⁿ – D₀ⁿ = Kt (D₀ = initial grain size, D = average grain size at time t, n = grain growth exponent and K = reaction constant). The grain growth exponent and activation energy of YAG fibers are ≈ 3 and 200 kJ/mol, respectively. The grain-growth behaviors of YAG were influenced by experimental conditions such as raw materials, initial particle size, initial particle distribution, etc.

Keywords: YAG, Fibers, Grain growth, Activation energy