Structural transformations in the a-tricalcium phosphate powders after mechanical activation and subsequent heat treatment

10th International School-Conference on Materials for Extreme Environment: Development, Production and Application

Shamray, V.F.^1 ; Karpihin, A.E.^1 ; Fedotov, A.Y.^1 ; Komlev, V.S.^1 ; Barinov, S.M.^1 ; Sirotinkin, V.P.^1

Institution of Russain Academy of Science, A.A. Baikov Institute of Metallurgy and Material Sciences, RAS, Leninskiy av. 49, Moscow

119991, Russia^1

关键词: Apatite structures;    Atomic parameter;    Average particle size;    Mechanical activation;    Phase evolutions;    Possible mechanisms;    Structural transformation;    Tricalcium phosphate powders;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/130/1/012049/pdf
DOI  :  10.1088/1757-899X/130/1/012049

来源: IOP

【 摘 要 】

X-ray diffraction analysis of the structural phase evolution in the a-TCP powder subjected to milling in the planetary mill in butanol, and followed by annealing at 1300 °C was performed. After milling, there was a systematic smoothing of the X-ray diffraction pattern of α-TCP. Significant changes in lattice constants and atomic parameters were not observed. The average particle size was reduced from 10 to 2 micrometers. The decrease of the size of coherently scattering domains CSD (250 to 80 nm) makes the main contribution to the X-ray lines broadening. The value of microstrain changes from 1 ∗10-6to 2∗10-4. After annealing at 1300 °C for 2 hours the phase with apatite structure was found. The content of the apatite phase increases with increasing of time of mechanical activation. Possible mechanisms of deformation of α-TCP particles and structural transformations α-TCP → HA are considered.