Effect of sintering temperature on the properties of biogenic hydroxyapatite–glass composites

Abstract

66.017 Composites based on biogenic hydroxyapatite and Na 2 O-B 2 O 3 -SiO 2 glass with the weight ratio 61 : 39 are produced. The effect of sintering temperature between 600 and 800°C on their basic properties is analyzed. To examine the effect of temperature, changes in the structure, linear and volume parameters, and density and porosity of the samples during sintering are studied. The pycnometric density of the composite is 2.904-3.009 g/cm 3 , apparent density 1.22-1.85 g/cm 3 , general porosity 36.2-59.5%, content of open porosity 0.14-0.93, and solubility in physiological solution (48 h) 0.38-1.69 wt.%. It is established that the pore structure of the composites can be controlled by variation in sintering temperature.

Hydroxyapatite and tricalcium phosphate composites with bioactive glass as second phase: State of the art and current applications

“…In spite of the development of pores, the final microstructure and related properties could be controlled by changing the HA‐to‐glass ratio and the first sintering temperature T 1 . As an alternative approach, also one‐step sintering solutions were proposed, but they required an accurate control to avoid excessive pore formation …”

“…As an alternative approach, also one-step sintering solutions were proposed, but they required an accurate control to avoid excessive pore formation. [178][179][180][181][182] Hu and Miao obtained a borosilicate glass powder with a softening point of 8218C by crushing Pyrex V R borosilicate glass fragments. Then they compared the processing requirements and final properties of pure HA ceramics and HA/borosilicate glass (50 wt %) composites prepared by slip casting.…”