Conferences

Decomposition Activation of Hydroxyapatite in Contact with β-Tricalcium Phosphate

V.Skorokhod,
   
L.L.Kolomiets,
   

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2010, #05/06
http://www.materials.kiev.ua/article/1576

Abstract

The paper examines the interphase interaction in mechanical mixtures of thermostable hydroxyapatite (HA) and β-tricalcium phosphate (β-TCP) powders depending on the annealing temperature, initial composition, and particle size with x-ray interpretation of phase changes. It is established that HA transforms into β-TCP by dehydration reaction during annealing of the mechanical mixtures of HA and β-TCP powders. The dehydration reaction is activated through the mechanical of interphase activation in which the limited stage of nucleation disappears. The interphase boundaries in the biphase HA-TCP mixture are more permeable for water vapors than monophase boundaries owing to their disordered structure.


DECOMPOSITION INTERPHASE ACTIVATION, DEHYDRATION, LIMITED STAGE OF NUCLEATION