scholarly journals Improved thermal stability of the piezoelectric properties of (Li, Ag)-co-modified (K, Na) NbO3 -based ceramics prepared by spark plasma sintering

2017 ◽  
Vol 100 (7) ◽  
pp. 2984-2990 ◽  
Author(s):  
Mingyu Li ◽  
Ngai Yui Chan ◽  
Danyang Wang
Keyword(s):  
Thermal Stability ◽  
Spark Plasma Sintering ◽  
Piezoelectric Properties ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Thermal Stability Of

scholarly journals Chemical Stability of Tricalcium Phosphate–Iron Composite during Spark Plasma Sintering

2018 ◽  
Vol 2 (3) ◽  
pp. 51 ◽  
Author(s):  
Mariano Casas-Luna ◽  
Miroslava Horynová ◽  
Serhii Tkachenko ◽  
Lenka Klakurková ◽  
Ladislav Celko ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Spark Plasma Sintering ◽  
Tricalcium Phosphate ◽  
Secondary Phases ◽  
Metallic Component ◽  
Promising Alternative ◽  
Bone Filler ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Thermal Stability Of

Tricalcium phosphate (Ca3(PO4)2, TCP) is a ceramic widely used as a bone filler material due to its good osteoconductivity. Nevertheless, its poor mechanical properties do not allow its use for load-bearing applications. Therefore, the option of improving its strength and toughness by adding a biocompatible metallic component is a promising alternative to overcome this drawback, leading to the fabrication of improved bone implants. The present work is focused on defining the thermal stability of alpha-TCP (α-TCP) when it is sintered together with iron (Fe) by spark plasma sintering. The results showed the thermal stability of the composite with no degradation or oxidation in the ceramic or metal phase. A clear advantage from the TCP-Fe composites when compared with others, such as hydroxyapatite-titanium, is the complete retention of the TCP due to the less reactivity with iron respect to titanium. Furthermore, the allotropic phase transformation from alpha to beta-TCP polymorph was reduced by sintering at 900 °C. However, the densification of the material was also impaired at this temperature. It is expected that spark plasma sintering will allow the fabrication of TCP–Fe composites free of secondary phases that compromise the mechanical strength of the material.

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