Novel open-cell bulk metallic glass foams with promising characteristics

Li, J.B.; Lin, Hsin-Yi; Jang, J.S.C.; Kuo, C.N.; Huang, J.C.

doi:10.1016/j.matlet.2013.04.071

Cited by 34 publications

(10 citation statements)

References 18 publications

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“…Bulk scaffolds with various porosities ranging from 2.0% to 72.4% were designed by mixing the Al spacer particles and the TiZr-based matrix powder with different volume fractions. Based on the results obtained using hot pressing in our previous studies [14][15][16], the stress, temperature, and holding time were set to 300 MPa, 520 • C (temperature within the supercooled liquid region), and 300 s, respectively. Then, the Al spacer particles were removed from the prepared scaffolds in a 2 M NaOH warm solution (approximately 70 • C).…”

Section: Alloysmentioning

confidence: 99%

“…The desired Young's modulus and compressive strength of the porous materials have been approximately predicted using the Gibson and Ashby model [14,15,30], in which the mechanical properties of the porous sample are related to its real porosity (or relative density). The relationships between Young's modulus and relative density, and between compressive strength and relative density are presented by Equations (4) and (5), respectively, = 1( )…”

Section: Predicting Young's Modulus and Compressive Strengthmentioning

confidence: 99%

“…Based on the density of the foam, the mechanical properties of a porous implant can be controlled by adjusting its relative porosity. In our previous studies [14][15][16], we have successfully estimated the Young's modulus and compressive strength of the Zr-based and TiZr-based open-cell BMG scaffolds by controlling the relative density using the Gibson and Ashby model.…”

Section: Introductionmentioning

confidence: 99%

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Open-Cell Tizr-Based Bulk Metallic Glass Scaffolds with Excellent Biocompatibility and Suitable Mechanical Properties for Biomedical Application

Nguyen

Wong

Song

et al. 2020

JFB

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A series of biocompatible high-porosity (up to 72.4%) TiZr-based porous bulk metallic glass (BMG) scaffolds were successfully fabricated by hot pressing a mixture of toxic element-free TiZr-based BMG powder and an Al particle space holder. The morphology of the fabricated scaffolds was similar to that of human bones, with pore sizes ranging from 75 to 250 μm. X-ray diffraction patterns and transmission electron microscopy images indicated that the amorphous structure of the TiZr-based BMG scaffolds remained in the amorphous state after hot pressing. Noncytotoxicity and extracellular calcium deposition of the TiZr-based BMG scaffolds at porosities of 32.8%, 48.8%, and 64.0% were examined by using the direct contact method. The results showed that the BMG scaffolds possess high cell viability and extracellular calcium deposition with average cell survival and deposition rates of approximately 170.1% and 130.9%, respectively. In addition, the resulting TiZr-based BMG scaffolds exhibited a considerable reduction in Young’s moduli from 56.4 to 2.3 GPa, compressive strength from 979 to 19 MPa, and bending strength from 157 MPa to 49 MPa when the porosity was gradually increased from 2.0% to 72.4%. Based on the aforementioned specific characteristics, TiZr-based BMG scaffolds can be considered as potential candidates for biomedical applications in the human body.

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Section: Alloysmentioning

confidence: 99%

Section: Predicting Young's Modulus and Compressive Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Open-Cell Tizr-Based Bulk Metallic Glass Scaffolds with Excellent Biocompatibility and Suitable Mechanical Properties for Biomedical Application

Nguyen

Wong

Song

et al. 2020

JFB

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“…In the case of metallic-based porous foams, these values are favorable because they are higher than those of most polymers or ceramic foams. [21] The measured data on the modulus and hardness of nanoporous Ag foams can be assessed using the Gibson and Ashby equation [22][23][24] :…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…[2]. Since it is not easy to measure the tensile or compression strength from the current foams, we can replace the yield strength by the hardness H. Empirically, the fitting values based on the model and experimental data yield n1~2, n2~1.5, C1~1, and C2~0.3 for open cell porous metals, [22][23][24] thus, the Gibson and Ashby equation can be modified as follows:…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Characterization and Functional Applications of Nanoporous Ag Foams Prepared by Chemical Dealloying

Wang

Huang

et al. 2015

Metall Mater Trans B

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In this study, the pure Ag nanoporous foams, with open cell pore volume fractions 55 to 70 pct and pore sizes 100 to 400 nm, have been prepared by chemical dealloying. The Ag nanoporous foams possess favorable modulus (~0.7 GPa) and strength (~14 MPa), much higher than most of the polymers or ceramic foams. It is found that the Ag nanoporous foams are appropriate candidates for the catalytic and electrode applications. However, they do not exhibit efficient anti-bacterial effect, unless much smaller bacteria with cell sizes of 100 nm or less in the neighborhood are encountered.

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Bulk Metallic Glasses for Implantable Medical Devices and Surgical Tools

et al. 2016

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Their inherent lack of dislocations and hence slip planes leads to exceptionally high strength and elasticity, approaching the theoretical limit. While oxide glasses and ceramics exhibit low toughness and brittle failure, BMGs can display toughness comparable to crystalline metals. [ 2 ] The lack of grain structure means that BMGs are homogeneous and exhibit isotropic behavior, even at sub-micrometer length scales, and, without grain boundaries or precipitates as oxidation sites, corrosion rates are significantly reduced compared to conventional metals.BMGs soften above an alloy-specifi c glass-transition temperature ( T g ) before eventual, time-dependent, crystallization at a higher, crystallization temperature ( T x ). In this supercooled liquid region (SCLR) between T g and T x , the viscous BMGs may be plastically shaped under low applied forces using polymer-processing techniques, such as hot embossing, extrusion, foaming, and injection and blow moulding, before again cooling to a solid metallic glass. With relatively low processing temperatures and no solidifi cation shrinkage, parts can be formed to netshape with excellent accuracy, and geometries, and surface patterns previously diffi cult in metals can be achieved with ease. [3][4][5][6][7] Such remarkable properties and behavior have led to significant interest in BMGs as engineering materials over the past 20 years, but it is only recently that their potential for use as a biomaterial has been studied. [ 8 ] To date, our understanding of material biocompatiblity has evolved mainly through empirical testing, observing the interaction of materials with cells and host tissue in vitro and in vivo. Materials can induce host responses varying from local and systemic infl ammation, hypersensistivity, toxicity, and even tumorogenesis, meaning that thorough evidence of material safety is required before regulatory approval and clinical translation. We now largely recognise the material characteristics that generate both favorable and undesired host responses, as outlined by Williams, [ 9 ] offering the opportunity for informed material design, while being cognisant that biocompatibility is specifi c to the application and host environment. [ 10 ] The original requirement of fi rst generation "biocompatible" materials was bio-inertness. [ 11 ] This included a resistance to corrosion in the body, and here Ti-and Co-based alloys scored highly. [ 12 ] Less-inert metals, such as Mg, were therefore not deemed suitable, although the ions released on dissolution are generally not harmful to the human body. However, current design requirements for biomaterials, including most recently biometals, include eliciting an appropriate host response, [ 13 ] and this can include the need to biodegrade and resorb. There are potential advantages for BMGs that span applications of With increasing knowledge of the materials science of bulk metallic glasses (BMGs) and improvements in their properties and processing, they have started to become candidate materials for biomedical dev...

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Novel open-cell bulk metallic glass foams with promising characteristics

Cited by 34 publications

References 18 publications

Open-Cell Tizr-Based Bulk Metallic Glass Scaffolds with Excellent Biocompatibility and Suitable Mechanical Properties for Biomedical Application

Open-Cell Tizr-Based Bulk Metallic Glass Scaffolds with Excellent Biocompatibility and Suitable Mechanical Properties for Biomedical Application

Characterization and Functional Applications of Nanoporous Ag Foams Prepared by Chemical Dealloying

Bulk Metallic Glasses for Implantable Medical Devices and Surgical Tools

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