The Structure and Properties of Calcium Phosphate Ceramics Produced from Monetite and Biogenic Hydroxyapatite

  
H.Tovstonoh,
  
A.Kotlyarchuk,
  
V.Skorokhod,
 
I.I.Savkova
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2014, #07/08
http://www.materials.kiev.ua/article/1251

Abstract

It is shown that porous calcium phosphate ceramics can be produced from monetite and biogenic hydroxyapatite, the starting materials being in the ratios 25 : 75, 50 : 50, and 75 : 25 wt.%. It is established that phase transitions and solid-phase reactions that take place during sintering form polyphosphate ceramics consisting of hydroxyapatite (Са5(РО4)3(ОН)), β-pyrophosphate (β-Са2Р2О7), and β-tricalcium phosphate (β-Са3(РО4)2), in which β-Са2Р2О7 and Са5(РО4)3(ОН) phases are predominant depending on the starting composition. The increase in biogenic hydroxyapatite content from 25 to 75 wt.% leads to decrease in the grain size and increase in the pore size. The porosity of ceramics is equal to 40–42% with predominant open porosity for all compositions. The ceramics has 32–55 MPa strength, which increases with the amount of biogenic hydroxyapatite in starting composition.


BIOCERAMICS, BIOGENIC HYDROXYAPATITE, CALCIUM PYROPHOSPHATE, MONETITE, STRUCTURE, TRICALCIUM PHOSPHATE