Effect of sintering time on the microstructure and properties of inorganic polyphosphate bioceramics

Abstract

Sintering is an important step in the fabrication process of ceramic bodies, which can significantly affect the microstructure and properties of materials. In this article, calcium based inorganic polyphosphate (CPP) bioceramics were synthesized by gravity sintering. Effects of the sintering time (30 minutes, 1 hour, 3 hours and 5 hours) on the microstructure, physicochemical degradation and mechanical property were investigated. It was found that all prepared CPP samples for various sintering times showed a β-CPP phase at the temperature of 800ºC. The sample morphology changed to more compact with extending the sintering time from 30 minutes to 5 hours. Moreover, the grain size increased with the increase of sintering time, from 1.59 μm for 30 minutes to 3.40 μm for 5 hours. The in vitro degradation test revealed that the degradation velocity had an inverse relationship with the sintering time. The CPP samples sintering for 30 minutes showed the fastest degradation, while CPP sintering for 5 hours was the slowest one. Compression test results showed that longer sintering times led to improved mechanical properties

Preparation, characterization, bioactivity and degradation behavior in vitro of copper-doped calcium polyphosphate as a candidate material for bone tissue engineering

“…The porosities of CCPP scaffolds measured by liquid displacement method were shown in Table 3 which were similar to the results of the literature. 21 The compressive strength of CCPP scaffold with the porosity of 70% was 5-9 MPa which met the strength requirements of cancellous bone (2-12 MPa). It indicated that this CCPP scaffold could serve as a promising candidate for bone repairing.…”

The effect of compression on solid-state properties of desloratadine and multicomponent crystal

“…Principally, absorption of FTIR band before and after compression showed similar features. That morphology of drug components can be analyzed using SEM [22][23]. SEM is an analysis technique used to observe the changes in particle morphology caused by compression pressure, including sintering phenomena.…”

Indirect casting of patient-specific tricalcium phosphate zirconia scaffolds for bone tissue regeneration using rapid prototyping methodology

“…The volume of pores in the sample was obtained from the diference in the initial and inal (after 2 h) displacement readings of ethanol in the tube. The porosity of the sample was then calculated from the ratio of pores and total volume [33,34].…”