scholarly journals Influence of ZrO2 Addition on Structural and Biological Activity of Phosphate Glasses for Bone Regeneration

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4058
Author(s):  
M. Mohan Babu ◽  
P. Syam Prasad ◽  
P. Venkateswara Rao ◽  
S. Hima Bindu ◽  
A. Prasad ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Biological Activity ◽  
Incubation Time ◽  
Sample Surface ◽  
Glass Forming Ability ◽  
Phosphate Glasses ◽  
Bioactive Materials ◽  
Glass Forming ◽  
Before And After ◽  
Thermal Stability Of

Zirconium doped calcium phosphate-based bioglasses are the most prominent bioactive materials for bone and dental repair and regeneration implants. In the present study, a 8ZnO–22Na2O–(24 − x)CaO–46P2O5–xZrO2 (0.1 ≤ x ≤ 0.7, all are in mol%) bioglass system was synthesized by the conventional melt-quenching process at 1100 °C. The glass-forming ability and thermal stability of the glasses were determined by measuring the glass transition temperature (Tg), crystallization temperature (Tc), and melting temperature (Tm), using differential thermal analysis (DTA). The biological activity of the prepared samples was identified by analyzing X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy-energy dispersive spectra (SEM-EDS), before and after immersion in simulated body fluid (SBF) for various intervals of 0, 1 and 5 days, along with the magnitude of pH and the degradation of glasses also evaluated. The obtained results revealed that the glass-forming ability and thermal stability of glasses increased with the increase in zirconia mol%. The XRD, FTIR, and SEM-EDS data confirmed a thin hydroxyapatite (HAp) layer over the sample surface after incubation in SBF for 1 and 5 days. Furthermore, the development of layer found to be increased with the increase of incubation time. The degradation of the glasses in SBF increased with incubation time and decreased gradually with the increase content of ZrO2 mol% in the host glass matrix. A sudden rise in initial pH values of residual SBF for 1 day owing to ion leaching and increase of Ca2+ and PO43− ions and then decreased. These findings confirmed the suitability of choosing material for bone-related applications.

Crystallization of Ni-Cr-Si-B and Ni-Cr-Fe-Si-B Amorphous Alloys

2014 ◽  
Vol 216 ◽  
pp. 35-38 ◽  
Author(s):  
Cosmin Codrean ◽  
Dragoş Buzdugan ◽  
Ramona Lǎzar ◽  
Viorel Aurel Şerban ◽  
Ion Mitelea
Keyword(s):  
Thermal Stability ◽  
Chemical Composition ◽  
Rapid Solidification ◽  
Amorphous Alloys ◽  
Structural Characteristics ◽  
Glass Forming Ability ◽  
Glass Forming ◽  
Melting Temperatures ◽  
Dta Analysis ◽  
Thermal Stability Of

Ni based amorphous alloys with Si and B, which can also, contains Fe and Cr, prepared by rapid solidification, have low melting temperatures. This fact increases their susceptibility to be joined by welding and brazing. The glass forming ability (GFA) is conditioned also by the crystallization delay, due to certain chemical composition of the alloys. The thermal stability of these alloys was revealed by DTA analysis and structural characteristics were investigated by XRD. Applying an annealing at temperatures between 420°C and 540°C, with 30 minutes maintaining time, allowed the investigation of phase occurred during the crystallization and the estimation of the crystalline grains dimensions.

Glass-Forming Ability and Thermal Stability of Gd55-xNdxCo20Al25 Metallic Glass

2013 ◽  
Vol 538 ◽  
pp. 270-273
Author(s):  
Li Li Zhang ◽  
Qi Jun Huang ◽  
Zhi Qin Liao ◽  
Feng Xu ◽  
Guang Chen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Amorphous Ribbon ◽  
Glass Forming Ability ◽  
X Ray Diffraction ◽  
Glass Transition Temperatures ◽  
X Ray ◽  
Glass Forming ◽  
Nd Substitution ◽  
Change Of Microstructure ◽  
Thermal Stability Of

The effects of Nd substitution in Gd55-xNdxCo20Al25 (x=0, 5, 10, 15 and 20) amorphous ribbon samples on glass-forming ability and thermal stability are studied. The change of microstructure cannot be identified by X-ray diffraction. The forecast of glass-forming ability following Fang’s method shows the increase with x, which is further confirmed experimentally by the increasing reduced glass-transition temperatures. The thermal stability has a minimum at x=10, and it is suggested to be due to the different effects of the reducing of Gd and the increase of Nd.

Glass forming ability and thermal stability of Ni63Cu9Fe8P20 melt spun ribbon

2004 ◽  
Vol 343 (1-3) ◽  
pp. 150-153 ◽  
Author(s):  
Krzysztof Ziewiec ◽  
Piotr Olszewski ◽  
Ryszard Gajerski ◽  
Sławomir Kąc ◽  
Aneta Ziewiec ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Glass Forming Ability ◽  
Glass Forming ◽  
Melt Spun ◽  
Thermal Stability Of

Glass forming ability and thermal stability of Cu68.5Ni12P19.5 and Cu66Ni11.5P22.5 melt spun ribbons

2004 ◽  
Vol 373 (1-2) ◽  
pp. 115-121 ◽  
Author(s):  
Krzysztof Ziewiec ◽  
Piotr Olszewski ◽  
Ryszard Gajerski ◽  
Andrzej Małecki
Keyword(s):  
Thermal Stability ◽  
Glass Forming Ability ◽  
Glass Forming ◽  
Melt Spun ◽  
Melt Spun Ribbons ◽  
Thermal Stability Of

Nanoindentation in Metallic Glasses with Different Plasticity

2015 ◽  
Vol 662 ◽  
pp. 19-22
Author(s):  
Kornel Csach ◽  
Jozef Miškuf ◽  
Alena Juríková ◽  
Maria Hurakova ◽  
Václav Ocelík ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Metallic Glasses ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Glass Forming Ability ◽  
Glass Forming ◽  
Thermal Stability Of

Nanoindentation and thermomechanical experiments on three types of metallic glasses with different glass forming ability were carried out. The nanoindentation behaviour at room temperature was associated with the creep at elevated temperatures. Different discontinuity populations and their shape observed on the nanoindentation loading curves were compared with morphology of plastic deformed indent regions. The influence of the differences in thermal stability of studied alloys on the nanoindentation in these alloys were studied as well.

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