scholarly journals Biocompatible Ceramic – Glass Composite – Manufacturing and Selected Physical – Mechanical Properties

10.5772/33350 ◽  
2012 ◽  
Author(s):  
Barbara StaniewiczBrudnik ◽  
Magorzata Lekk
Keyword(s):  
Mechanical Properties ◽  
Glass Composite ◽  
Composite Manufacturing ◽  
Ceramic Glass

scholarly journals Effect of Melt-Derived Bioactive Glass Particles on the Properties of Chitosan Scaffolds

2019 ◽  
Vol 10 (3) ◽  
pp. 38 ◽  
Author(s):  
Hamasa Faqhiri ◽  
Markus Hannula ◽  
Minna Kellomäki ◽  
Maria Teresa Calejo ◽  
Jonathan Massera
Keyword(s):  
Mechanical Properties ◽  
Tissue Engineering ◽  
Calcium Phosphate ◽  
Bioactive Glass ◽  
Pore Size ◽  
Glass Content ◽  
Micro Computed Tomography ◽  
Glass Composite ◽  
Composite Scaffolds ◽  
Bioactive Glasses

This study reports on the processing of three-dimensional (3D) chitosan/bioactive glass composite scaffolds. On the one hand, chitosan, as a natural polymer, has suitable properties for tissue engineering applications but lacks bioactivity. On the other hand, bioactive glasses are known to be bioactive and to promote a higher level of bone formation than any other biomaterial type. However, bioactive glasses are hard, brittle, and cannot be shaped easily. Therefore, in the past years, researchers have focused on the processing of new composites. Difficulties in reaching composite materials made of polymer (synthetic or natural) and bioactive glass include: (i) The high glass density, often resulting in glass segregation, and (ii) the fast bioactive glass reaction when exposed to moisture, leading to changes in the glass reactivity and/or change in the polymeric matrix. Samples were prepared with 5, 15, and 30 wt% of bioactive glass S53P4 (BonAlive ®), as confirmed using thermogravimetric analysis. MicrO–Computed tomography and optical microscopy revealed a flaky structure with porosity over 80%. The pore size decreased when increasing the glass content up to 15 wt%, but increased back when the glass content was 30 wt%. Similarly, the mechanical properties (in compression) of the scaffolds increased for glass content up to 15%, but decreased at higher loading. Ions released from the scaffolds were found to lead to precipitation of a calcium phosphate reactive layer at the scaffold surface. This is a first indication of the potential bioactivity of these materials. Overall, chitosan/bioactive glass composite scaffolds were successfully produced with pore size, machinability, and ability to promote a calcium phosphate layer, showing promise for bone tissue engineering and the mechanical properties can justify their use in non-load bearing applications.

Material characterization for laminated glass composite panel

2017 ◽  
Vol 1 (81) ◽  
pp. 11-17 ◽  
Author(s):  
K. Väer ◽  
J. Anton ◽  
A. Klauson ◽  
M. Eerme ◽  
E. Õunapuu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Wave Propagation ◽  
Residual Stresses ◽  
Material Properties ◽  
Composite Panel ◽  
Laminated Glass ◽  
Glass Composite ◽  
Private Company ◽  
Viscoelastic Interlayer ◽  
Non Destructive

Purpose: Laminated glass composite panel (LGCP) with at least one flexible plastic/ viscoelastic interlayer is considered. The purpose of this paper is to determine the material properties of the constituents of LGCP required for accurate modelling of the laminated glass structures. Design/methodology/approach: The proposed approach includes the following three type of tests: non-destructive tests for determining mechanical properties of the glass layers (based on wave propagation), mechanical tests and finite element simulations for determining properties of the interlayers, measuring residual stresses in glass layers using novel methods and equipment (non-destructive, wave propagation based). Findings: Methodology and procedures for determining material properties of the LGCP. Research limitations/implications: Due to fact that the shear moduli of the viscoelastic interlayers and glass skin layers differs up to thousands times, the direct application of the classical sandwich theory may lead to inaccurate results. The layer wise plate theory with viscoelastic interlayer should be applied. In the case of layer wise theory, the material properties should be determined for each layer (not averaged properties for laminate only). Practical implications: The proposed approach allows to determine the properties of the LGCP components with high accuracy and form base for development of accurate plate model for modelling vibration, buckling and bending of the LGCP. The effect of the residual stresses is most commonly omitted in engineering applications. However, in the case of tempered glass the residual stresses are significant and have obviously impact on stress- strain behaviour of the laminated glass panel. Originality/value: Study consists of valuable parts, i.e. determining residual stresses in glass performed in cooperation with private company GlasStress Ltd. Special software and measuring equipment are developed. Further LGCP interlayer mechanical properties are tested experimentally and using simulation tools for design optimization purposes.

Tape Casting and Dielectric Properties of Sr2ZnSi2O7-Based Ceramic-Glass Composite for Low-Temperature Co-fired Ceramics Applications

2010 ◽  
Vol 8 (4) ◽  
pp. 854-864 ◽  
Author(s):  
Tony Joseph ◽  
Mailadil T. Sebastian ◽  
Heli Jantunen ◽  
Mohan Jacob ◽  
Hariharaiyer Sreemoolanadhan
Keyword(s):  
Dielectric Properties ◽  
Low Temperature ◽  
Tape Casting ◽  
Glass Composite ◽  
Ceramic Glass

Formation, microstructure, and mechanical properties of in situ Mg–Ni–(Gd,Nd) bulk metallic glass composite

2009 ◽  
Vol 24 (12) ◽  
pp. 3603-3610 ◽  
Author(s):  
Jian Yin ◽  
Guangyin Yuan ◽  
Zhenhua Chu ◽  
Jian Zhang ◽  
W.J. Ding
Keyword(s):  
Mechanical Properties ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Hexagonal Lattice ◽  
Shear Bands ◽  
Glassy Matrix ◽  
Glass Composite ◽  
Specific Strength ◽  
Periodic Arrays ◽  
Bulk Metallic Glass Composite

Based on a ternary Mg75Ni15Gd10 metallic glass former, a new Mg80Ni12Gd4Nd4 bulk metallic glass composite (BMGC) was developed by tailoring the compositions of Mg and rare earth (RE) elements. This BMGC displayed compressive ultimate strength over 900 MPa with a total strain to failure of 4.3% and specific strength of 3.12 × 105 Nm/kg. The improved mechanical properties were attributed to a “dual phases” structure consisting of Mg solid solution flakes and glassy matrix in the Mg80Ni12Gd4Nd4 BMGC. The homogeneously dispersed Mg phases reinforcement in the BMGC were characterized as a long period ordered structure (LPOS) with periodic arrays of six close-packed planes distorted from the ideal hexagonal lattice of 6H-type. The LPOS-Mg in the composite can act as a soft media to trap or interact with the unstable shear bands and contribute to plastic strain. The present study may provide a guideline for designing the Mg–TM–RE-based (TM: transition metals) BMGCs with “dual phases” structures.

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