High thermal stability and high tensile strength terpolyester nanofibers containing biobased monomer: fabrication and characterization

RSC Advances ◽  
2016 ◽  
Vol 6 (46) ◽  
pp. 40383-40388 ◽  
Author(s):  
Hoik Lee ◽  
Jun Mo Koo ◽  
Daewon Sohn ◽  
Ick-Soo Kim ◽  
Seung Soon Im
Keyword(s):  
Thermal Stability ◽  
Tensile Strength ◽  
Ethylene Glycol ◽  
Terephthalic Acid ◽  
High Thermal Stability ◽  
High Tensile Strength ◽  
Fabrication And Characterization

Novel nanofibers of a highly heat-resistive biobased terpolyester of isosorbide (ISB), ethylene glycol, 1,4-cyclohexane dimethanol and terephthalic acid (PEICT) were fabricated using electrospinning and their properties were characterized.

scholarly journals Effects of Substitution of Y with Yb and Ce on the Microstructures and Mechanical Properties of Mg88.5Zn5Y6.5

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 31
Author(s):  
Hongxin Liao ◽  
Taekyung Lee ◽  
Jiangfeng Song ◽  
Jonghyun Kim ◽  
Fusheng Pan
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Yield Strength ◽  
Creep Resistance ◽  
Room Temperature ◽  
High Thermal Stability ◽  
Long Period ◽  
Microstructures And Mechanical Properties

The microstructures and mechanical properties of the Mg88.5Zn5Y6.5-XREX (RE = Yb and Ce, X = 0, 1.5, 3.0, and 4.5) (wt.%) alloys were investigated in the present study. Mg88.5Zn5Y6.5 is composed of three phases, namely, α-Mg, long-period stacking ordered (LPSO) phases, and intermetallic compounds. The content of the LPSO phases decreased with the addition of Ce and Yb, and no LPSO phases were detected in Mg88.5Zn5Y2.0Yb4.5. The alloys containing the LPSO phases possessed a stratified microstructure and exhibited excellent mechanical properties. Mg88.5Zn5Y5.0Ce1.5 exhibited the highest creep resistance and mechanical strength at both room temperature and 200 °C, owing to its suitable microstructure and high thermal stability. The yield strength of Mg88.5Zn5Y5.0Ce1.5 at room temperature was 358 MPa. The ultimate tensile strength of Mg88.5Zn5Y5.0Ce1.5 at room temperature and 200 °C was 453 MPa and 360 MPa, respectively.

Preparation of Zr-based Metallic Glass Wire for Biomedical Application

2007 ◽  
Vol 1048 ◽  
Author(s):  
Takeshi Nagase ◽  
Koichi Kinoshita ◽  
Yukichi Umakoshi
Keyword(s):  
Tensile Strength ◽  
Metallic Glass ◽  
Extraction Method ◽  
Biomedical Application ◽  
High Thermal Stability ◽  
High Tensile Strength ◽  
Melt Extraction ◽  
Arc Melting ◽  
Co Alloys ◽  
Melt Extraction Method

AbstractNew Zr based metallic glass wires without bio-toxic elements of Ni, Al and Be were devel-oped for the further application as biomaterials by arc-melting type melt-extraction method. The continuous metallic glass wires with a good white luster and smooth surface were obtained in Zr-Ti-Al-Co, Zr-Al-Co-Cu, Zr-Al-Co and Zr-Ti-Co alloys. The Zr-based metallic glass wires show high tensile strength reaching 1000MPa. Furthermore, the wires exhibit good bending duc-tility and can be bent through 180 degrees without fracture. The Zr-based metallic glass wires achieve simultaneously high tensile strength, good bending ductility and high thermal stability.

scholarly journals Effects of Ce-Rich Misch Metal on the Microstructures and Tensile Properties of as-Cast Mg-7Al-3Sn-1Zn Alloys

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1648
Author(s):  
Guo-Jun Liu ◽  
Yan-Hua Sun ◽  
Nan Xia ◽  
Xiao-Fang Guan
Keyword(s):  
Thermal Stability ◽  
Tensile Strength ◽  
Tensile Properties ◽  
Room Temperature ◽  
High Thermal Stability ◽  
Misch Metal ◽  
Mg17al12 Phase ◽  
Elongation To Failure ◽  
Thermal Stability Of ◽  
Strength And Ductility

The effects of small amounts of Ce-rich misch metal (Mm: 0.5, 1.0 and 2.0 wt.%) addition on the microstructure and tensile properties of as-cast Mg-7Al-3Sn-1Zn wt.% (ATZ731) alloy have been investigated. The addition of Mm restricts the formation of the Mg17Al12 phase but greatly promotes the Al4Mm phase. The proper Mm addition enhances the strength and ductility of ATZ731 alloys at both room temperature (RT) and 175 °C. ATZ731 alloys with 1.0 wt.% Mm addition exhibit an advantageous combination strength and ductility, with the ultimate tensile strength (UTS), 0.2% yield strength (YS) and elongation to failure (Ef) at 175 °C of ~148 MPa, ~102 MPa and ~28%, improved by ~14.7%, ~24.3% and ~53.8%, respectively, compared to those of ATZ731 alloy. This enhancement is primarily owing to the refined microstructures and the high thermal stability of Al4Mm at the elevated temperature in contrast with that of the Mg17Al12 phase. The fracture modes are also discussed.

Low-Tg polyimides containing multiple ether linkages and cyano pendants

2018 ◽  
Vol 31 (4) ◽  
pp. 369-379 ◽  
Author(s):  
Li Zhang ◽  
Xian Wu ◽  
Shanyou Liu ◽  
Jinwu Peng ◽  
Baijun Liu
Keyword(s):  
Thermal Stability ◽  
Weight Loss ◽  
Tensile Strength ◽  
Chemical Structure ◽  
Great Influence ◽  
Nitrogen Atmosphere ◽  
High Thermal Stability ◽  
Similar Chemical ◽  
Cyano Groups ◽  
Step Polymerization

Some multi-ether linked polyimides (PIs) derived from two diamine monomers containing various amount of cyano groups are synthesized by a typical two-step polymerization. Meanwhile, the PIs with similar chemical structure but without cyano groups are prepared as counterparts for comparison purposes. The obtained PIs exhibit low glass transition temperature values of 211–258°C, which are associated with their multi-ether chemical structure. Furthermore, these PIs have high thermal stability, and the temperatures at 10% weight loss are in the range of 524–616°C under nitrogen atmosphere. It is found that the introduction of cyano groups would have a great influence on the properties of the PIs. The tensile strength and Young’s modulus of one cyano-containing PI reach 121 MPa and 1.4 GPa, respectively, which are much higher than those cyano-free ones. In addition, the cyano-containing PIs exhibit different behaviors of dielectricity and solubility in comparison with the corresponding cyano-free counterparts.

Advances in SiC Fibers for High Temperature Applications

2006 ◽  
Vol 50 ◽  
pp. 17-23 ◽  
Author(s):  
Hiroshi Ichikawa
Keyword(s):  
Thermal Stability ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Creep Resistance ◽  
Thermal Exposure ◽  
High Tensile Strength ◽  
Ceramic Fibers ◽  
Sic Fiber ◽  
Sic Composites ◽  
Electron Beam Curing

The oxygen free SiC fiber (Hi-Nicalon) has been commercially produced by an electron beam curing process. And then the SiC fiber (Hi-Nicalon Type S) having stoichiometric SiC composition and high crystallinity has been developed. Hi-Nicalon fiber has higher elastic modulus and thermal stability than Nicalon fiber. The Type S fiber has the highest elastic modulus and thermal stability and excellent creep resistance in three types of Nicalon fibers. Recently，Type S fibers as industrial products have been developed and put on the market. The Type S fibers have a high tensile strength of 2.8 GPa, a high elastic modulus of 390 GPa. Against thermal exposure, Type S retains a tensile strength of 2.3 GPa and hardly changes its elastic modulus even at 1873K. Moreover, Type S has outstanding creep resistance. Type S shows higher stress relaxation ratio than many other ceramic fibers after thermal exposure over 1673K. Now, Hi-Nicalon Type S fiber/BN/SiC composites are being developed as the components of gas turbine for aerospace and land based power generation such as shrouds and combustors. Type Hi-Nicalon S can be supplied about 30 kg per a month at present.

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