scholarly journals PHYSICAL AND MECHANICAL PROPERTIES OF LOW, ULTRALOW AND NO CEMENT REFRACTORY CASTABLES CONTAINING MGO NANO-PARTICLES DEVELOPED IN SITU BY MEANS OF POLYMERIC RESINS

2021 ◽  
pp. 561-578
Author(s):  
José Antonio Alves Júnior ◽  
João Baptista Baldo Baldo
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Nano Particles ◽  
Refractory Castables ◽  
Polymeric Resins

scholarly journals Physical and mechanical properties of low, ultralow and no cement refractory castables containing MgO nanoparticles developed in situ by means of polymeric resins

Cerâmica ◽  
2019 ◽  
Vol 65 (376) ◽  
pp. 592-598
Author(s):  
J. A. Alves Júnior ◽  
J. B. Baldo
Keyword(s):  
Pechini Method ◽  
Physical And Mechanical Properties ◽  
High Alumina ◽  
Mgo Nanoparticles ◽  
Low Viscosity ◽  
Refractory Castables ◽  
The Matrix ◽  
Polymeric Resins ◽  
Mixing Water

Abstract The introduction of MgO nanoparticles developed in situ in the matrix of high-alumina low cement, ultra-low and no cement refractory castables was made by means of a low viscosity containing aqueous polymeric resin, produced by the Pechini method. The addition of the liquid resin to the castables played two roles: first to serve as a supplier of mixing water and second as a precursor of nanoparticles of MgO, which were formed in situ in the castables matrices during firing. The results confirmed the benefits brought by the developed in situ MgO nanoparticles on the refractory properties of the investigated castables.

A Novel In-Situ Nanoindentation Characterization of Phase Transforming Materials

2015 ◽  
Vol 1754 ◽  
pp. 19-24
Author(s):  
A. Alipour Skandani ◽  
R. Ctvrtlik ◽  
M. Al-Haik
Keyword(s):  
Mechanical Properties ◽  
Phase Transformation ◽  
Creep Compliance ◽  
Physical And Mechanical Properties ◽  
In Situ Methods ◽  
Negative Creep ◽  
Nanoindentation Instrument ◽  
Structural Instabilities

ABSTRACTMaterials with different allotropes can undergo one or more phase transformations based on the changes in the thermodynamic states. Each phase is stable in a certain temperature/pressure range and can possess different physical and mechanical properties compared to the other phases. The majority of material characterizations have been carried out for materials under equilibrium conditions where the material is stabilized in a certain phase and a lesser portion is devoted for onset of transformation. Alternatively, in situ measurements can be utilized to characterize materials while undergoing phase transformation. However, most of the in situ methods are aimed at measuring the physical properties such as dielectric constant, thermal/electrical conductivity and optical properties. Changes in material dimensions associated with phase transformation, makes direct measurement of the mechanical properties very challenging if not impossible. In this study a novel non-isothermal nanoindentation technique is introduced to directly measure the mechanical properties such as stiffness and creep compliance of a material at the phase transformation point. Single crystal ferroelectric triglycine sulfate (TGS) was synthetized and tested with this method using a temperature controlled nanoindentation instrument. The results reveal that the material, at the transformation point, exhibits structural instabilities such as negative stiffness and negative creep compliance which is in agreement with the findings of published works on the composites with ferroelectric inclusions.

CHARACTERIZATION AND APPLICATION OF CONDUCTING POLYMER COATED TEXTILES

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1241-1247 ◽  
Author(s):  
LIJING WANG ◽  
TONG LIN ◽  
XUNGAI WANG
Keyword(s):  
Mechanical Properties ◽  
Physical Properties ◽  
Conducting Polymer ◽  
Physical And Mechanical Properties ◽  
Fibrous Materials ◽  
Conductive Coating ◽  
Coating Durability

This paper reports on some physical properties of a conducting polymer, polypyrrole, coated textiles. Polypyrrole was coated on textiles chemically through in-situ solution or vapor polymerisation to produce conducting textiles. The effects of the conductive coating on the physical and mechanical properties of the fibrous materials are presented. The coating durability and conductivity of the textiles have also been examined.

Efficacy of Activated Carbon In Situ to Oil Palm Frond Paper for Active Packaging on Mechanical Properties

2012 ◽  
Vol 506 ◽  
pp. 607-610 ◽  
Author(s):  
N. Thongjun ◽  
Lerpong Jarupan ◽  
Chiravoot Pechyen
Keyword(s):  
Mechanical Properties ◽  
Activated Carbon ◽  
Moisture Content ◽  
Oil Palm ◽  
Physical And Mechanical Properties ◽  
Active Packaging ◽  
Modulus Of Rupture ◽  
Oil Palm Frond ◽  
Palm Frond

Oil palm frond pulp (OPF) was blended with activated carbon for the purpose of active packaging in this preliminary study. It was aimed to investigate the effect of in-situ activated carbon on physical and mechanical properties of the pulp handsheets made from OPF. Testing of property performances of the resulted handsheets included density, moisture content, thickness swelling, folding, tensile strength, %elongation, stiffness, and modulus of rupture. Ultimately, the intention is to use for prospected active packaging for fresh produce. OPF pulp was prepared by the kraft process. The pulp stock was mixed with different proportions of activated carbon (0, 10, 20, and 30% w/w). The results showed that an increased proportion of activated carbon decreased density and thickness selling, but had no effect on moisture content.

Formation and properties of nanocomposites made up from solid aspen wood, melamine-urea-formaldehyde, and clay

Holzforschung ◽  
2007 ◽  
Vol 61 (2) ◽  
pp. 148-154 ◽  
Author(s):  
Xiaolin Cai ◽  
Bernard Riedl ◽  
S.Y. Zhang ◽  
Hui Wan
Keyword(s):  
Mechanical Properties ◽  
Ball Mill ◽  
Urea Formaldehyde ◽  
Surface Hardness ◽  
Physical And Mechanical Properties ◽  
Water Soluble ◽  
Aspen Wood ◽  
Wood Polymer ◽  
Density Surface

Abstract Wood polymer nanocomposites were prepared from solid aspen wood, water-soluble melamine-urea-formaldehyde (MUF) resin, and silicate nanoclays. The nanofillers were ground with a ball-mill before being mixed with the MUF resin and impregnated into the wood. The water-soluble prepolymer was mixed with the nanoclays at a mixing speed of 3050 rpm for 20 min to form impregnation solutions. Wood was impregnated with resin, which polymerized in situ under certain conditions. The physical and mechanical properties of the composite and the effect of ball-milling treatment of nanofillers on these properties were investigated. Significant improvements in physical and mechanical properties, such as density, surface hardness, and modulus of elasticity, were obtained for specimens impregnated with MUF resin and nanoclay-MUF resin mixtures. Ball-mill treatment favors dispersion of the nanofillers into the wood, but also appears to interfere with particle-resin adhesion.

Structural, Physical and Mechanical Properties of Mg-Al Alloys Processed under CO2 Atmosphere

2012 ◽  
Vol 545 ◽  
pp. 247-250 ◽  
Author(s):  
Subramanian Jayalakshmi ◽  
Khoo Chee Guan ◽  
Kuma Joshua ◽  
Manoj Gupta
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Yield Strength ◽  
Magnesium Alloys ◽  
Physical And Mechanical Properties ◽  
Melting Process ◽  
Al Alloys ◽  
Compressive Yield Strength ◽  
Protective Atmospheres

Magnesium alloys are the lightest structural materials known that are increasingly replacing steel and aluminium. However, due to its flammable nature, protective atmospheres are employed during Mg-alloy production. In this novel work, Mg-Al alloys with ~3 and ~5 wt.% Al were processed in CO2atmosphere, so as to utilize the CO2during the melting process. The cast Mg-Al alloys were extruded and studied for their structural, physical and mechanical properties. Results showed improvements in mechanical properties such as hardness, tensile strength and compressive yield strength. The improvement in properties was attributed to thein situformation of Al4C3arising due to molten metal-carbon interaction. It is noteworthy that the incorporation of CO2during processing did not adversely affect the mechanical properties of the alloys. Further, the process is eco-friendly as it not only utilized CO2, but also eliminates use of harmful cover gases.

Silica-Polyester Nanocomposites Prepared by Polycondensation In Situ: Synthesis and Mechanical Properties

2012 ◽  
Vol 714 ◽  
pp. 277-282 ◽  
Author(s):  
Miroslawa El Fray ◽  
Michal Rybko ◽  
Agnieszka Piegat
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Nanocomposite Materials ◽  
Soft Segments ◽  
Dimerized Fatty Acid ◽  
Hard Segments ◽  
Silica Nanopowder ◽  
Matrix Nanocomposites ◽  
Polymer Matrix Nanocomposites

New multiblock polymer-matrix nanocomposites were prepared by the in situ polycondensation. Polymers containing 30% hard segments of poly (butylene terephthalate) (PBT) and 70% soft segments built up from dimerized fatty acid (DLA), were modified with silica nanopowder. The nanocomposite materials were prepared by polycondensation in situ with the use of two different catalysts. Two types of nanosilica (Evonic Aerosil R 972 hydrophobic, and Aerosil 130 - hydrophilic) in amount of 0.1, 0.2 and 0.3 wt. % were used. Physical and mechanical properties were examined. The results indicate a strong influence of transesterification stoichiometry and type of catalyst on physical and mechanical properties. The amount of nanofiller and its character (hydrophilic or hydrophobic) showed also an influence on mechanical properties of synthesized nanocomposites indicating the best mechanical properties for nanocomposite containing 0.1wt% hydrophobic silica nanopowder (over 70% increase in elongation and 30% increase in tensile strength).

Physical and Mechanical Properties of Mullite-Whisker Reinforced Alumina Composites

2007 ◽  
Vol 334-335 ◽  
pp. 325-328 ◽  
Author(s):  
Wei Kong Pang ◽  
Nobuo Tezuka ◽  
It Meng Low ◽  
E.G. Mehrtens ◽  
Bruno A. Latella
Keyword(s):  
Mechanical Properties ◽  
Thermal Analysis ◽  
Hot Isostatic Pressing ◽  
Physical And Mechanical Properties ◽  
Reaction Sintering ◽  
Alumina Matrix ◽  
Young’S Moduli ◽  
Solid Density ◽  
Alumina Composites

Reaction sintering and hot-isostatic-pressing (HIP) have been used for the compaction and densification of mullite-whisker-reinforced alumina composites. The effect of alumina matrix constraints on the in-situ transformation sequence in alumina-halloysite-AlF3 system was studied using differential thermal analysis. The physical and mechanical properties of the HIPed samples have been characterized in terms of bulk density, apparent solid density, porosity, Young’s moduli, flexural strength, hardness and the fracture toughness.

Microstructure and Mechanical Properties of In Situ Cast Aluminum Based Composites Reinforced with TiC Nano-Particles

2020 ◽  
Vol 985 ◽  
pp. 211-217
Author(s):  
Wojciech Maziarz ◽  
Piotr Bobrowski ◽  
Anna Wójcik ◽  
Agnieszka Bigos ◽  
Łukasz Szymański ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Coefficient Of Thermal Expansion ◽  
Nano Particles ◽  
Cast Aluminum ◽  
Casting Method ◽  
Microstructure And Mechanical Properties ◽  
Transmission Electron ◽  
Cast Composites ◽  
In Situ Formation

This work concerns microstructure and mechanical properties investigations of aluminum based composite strengthened with the TiC particles being in nanometer size. The composites were fabricated by the casting method combined with in-situ formation of TiC particles. Applying a suitable composition of components and moderators of SHS reaction which occur during casting, it was possible to cast the samples with TiC particles of size of 150 nm and faceted shape. Microstructure investigations using scanning and transmission electron microscopy (SEM and TEM) allowed to identified the distribution of TiC particles and their preferred location in the microstructure of composites. Also the additional precipitates with different size and shape were identified in investigated samples. Significant increase of strength was observed in in-situ cast composites in comparison to Al-1000 alloy mainly due mainly due to coefficient of thermal expansion and elastic modulus mismatch between the reinforcements and the metal matrix, Hall-Pecht relation and also in minority the Orowan effect.

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