Processing and Characterization of Porous Ti2AlC Using Space Holder Technique

2016 ◽  
Vol 704 ◽  
pp. 197-203 ◽  
Author(s):  
Jesus Gonzalez-Julian ◽  
Martin Bram
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Max Phase ◽  
Space Holder ◽  
Porous Ti ◽  
Low Thermal Expansion ◽  
Final Microstructure ◽  
Ammonium Hydrogen ◽  
Oxidation And Corrosion

Ti2AlC is one of the most promising MAX phase materials due to its combination of properties at high temperatures (> 800 °C) such as high strength, good oxidation and corrosion resistances, low thermal expansion, readily machinable, high thermal conductivity and nonsusceptibility to thermal shock. Porous structures based on Ti2AlC are excellent candidates for diverse applications such as heat exchangers and filters, although more systematic studies are required to implement this material. In this work, porous Ti2AlC material was obtained using a low cost and eco-friendly process, the space holder technique. Commercial Ti2AlC powder was mixed with different contents (30, 50 and 70 vol.%) of ammonium hydrogen bicarbonate (NH4HCO3) as space holder. Afterwards, the obtained powder was uniaxially pressed, followed by elimination of space holder by a heat treatment at low temperature. Finally, porous Ti2AlC structures were consolidated at 1350 °C under argon atmosphere. Processing, final microstructure and pore characterization of the consolidated materials are described in detail.

SYNTHESIS AND CHARACTERISATION OF WOVENROVING GLASS MAT FOR EPOXYCOMPOSITES

2020 ◽  
Vol 15 (4) ◽  
Author(s):  
Mahesh Mallampati ◽  
Sreekanth Mandalapu ◽  
Govidarajulu C
Keyword(s):  
Tensile Strength ◽  
Glass Fiber ◽  
Low Cost ◽  
Weight Ratio ◽  
High Strength ◽  
Hardness Test ◽  
Industrial Applications ◽  
Sem Analysis ◽  
Low Thermal Expansion ◽  
Manufacturing Techniques

The composite materials are replacing the traditional materials because oftheir superior properties such as high tensile strength, low thermal expansion, high strength to weight ratio, low cost, lightweight, high specific modulus, renewability and biodegradability which are the most basic & common attractive features of composites that make them useful for industrial applications. The developments of new materials are on the anvil and are growing day by day. The efforts to produce economically attractive composite components have resulted in several innovative manufacturing techniques currently being used in the composites industry. Generally, composites consist of mainly two phases i.e., matrix and fiber. In this study, woven roving mats (E-glass fiber orientation (-45°/45°,0°/90°, - 45°/45°),UD450GSM)were cut in measured dimensions and a mixture of Epoxy Resin (EPOFINE-556, Density-1.15gm/cm3), Hardener (FINE HARDTM 951, Density- 0.94 gm/cm3) and Acetone [(CH3)2CO, M= 38.08 g/mol] was used to manufacture the glass fiber reinforced epoxy composite by hand lay-up method. Mechanical properties such as tensile strength, SEM analysis, hardness test, density tests are evaluated.

Synthesis, Characterization and Mechanical Properties of Silicon Carbide Nanowires

2010 ◽  
Author(s):  
Huan Zhang ◽  
Weiqiang Ding ◽  
Daryush Aidun
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Silicon Carbide ◽  
Physical And Mechanical Properties ◽  
High Hardness ◽  
High Strength ◽  
Harsh Environments ◽  
Low Density ◽  
Low Thermal Expansion ◽  
Oxidation And Corrosion

Silicon carbide (SiC) material has many outstanding physical and mechanical properties such as high strength, high hardness, low density, high thermal conductivity, low thermal expansion coefficient, large band-gap, and excellent oxidation and corrosion resistances [1–3]. It is a leading material for components and devices operating at high temperature, high power and under harsh environments [4–5]. Micro-sized SiC particles and whiskers are commonly used as reinforcement materials for ceramics, metals and alloys in various structural and tribological applications [6–7].

scholarly journals Microstructural and Mechanical Characterization of a Nanostructured Bainitic Cast Steel

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 612 ◽  
Author(s):  
Andrés Felipe Santacruz-Londoño ◽  
Oscar Rios-Diez ◽  
José A. Jiménez ◽  
Carlos Garcia-Mateo ◽  
Ricardo Aristizábal-Sierra
Keyword(s):  
Cast Steel ◽  
Isothermal Holding ◽  
High Strength ◽  
Cast Steels ◽  
Final Microstructure ◽  
Potential Applications ◽  
Steel Castings ◽  
Kinetics Of ◽  
Holding Temperature

Nanoscale bainite is a remarkable microstructure that exhibits a very promising combination of high strength with good ductility and toughness. The development of these types of microstructures has been focused on wrought materials, and very little information is available for steel castings. In this work, a specially designed cast steel with 0.76 wt % C was fabricated, and the heat treatment cycles to develop bainitic nanostructures were determined by studying the kinetics of the bainitic transformation using high-resolution dilatometry. The effects of isothermal holding temperature and time on the final microstructure and mechanical properties were thoroughly characterized in order to evaluate a future industrial implementation of the process in an effort to contribute to enhance and widen the potential applications for cast steels.

Characterization of porous Ti-bioglass composite produced by mechanical milling and space holder sintering

Rare Metals ◽  
2014 ◽  
Vol 34 (9) ◽  
pp. 638-644 ◽  
Author(s):  
Saeed Riahi ◽  
Mohammad Rajabi ◽  
Sayed Mahmood Rabiee
Keyword(s):  
Mechanical Milling ◽  
Space Holder ◽  
Porous Ti

Mechanochemical Synthesis of Nanosized Hydroxyapatite Powder and its Conversion to Dense Bodies

2011 ◽  
Vol 694 ◽  
pp. 118-122 ◽  
Author(s):  
Sharifah Adzila ◽  
Iis Sopyan ◽  
Mohd Hamdi Bin Abd Shukor ◽  
Ramesh Singh
Keyword(s):  
High Speed ◽  
Rotation Speed ◽  
High Strength ◽  
X Ray Diffraction ◽  
Nanosize Powder ◽  
Ammonium Hydrogen ◽  
Tcp Phase ◽  
Nanosized Hydroxyapatite ◽  
The Stability

In this work, nanosized hydroxyapatite (HA) powder was synthesized via mechanochemical method by a dry mixture of calcium hydroxide Ca(OH)2 and di-ammonium hydrogen phosphate (NH4)2HPO4 powders. The effect of mechanochemical process on powder properties was investigated. Three rotation speeds of 170 rpm, 270 rpm and 370 rpm were chose with 15 hours milling time respectively. Characterization of nanopowders was accomplished by Fourier transform infra red (FTIR), X-ray diffraction (XRD) and nanosizer analysis. The green compacted powders with 200 MPa isostatically pressed were prepared and sintered in atmosphere condition at various temperatures ranging from 1150oC - 1350oC. The results showed that the rotation speed affected the obtained powders where the crystallite size was found increased with rotation speed (9 – 21 nm). In contrast, the particle size distribution decreased with rotation speed (322-192 nm). The sintering process has influenced the stability of powder by yielding TCP phase at a lower sintering temperature, 1150oC. However, powder synthesized at 370 rpm has showed a significant hardness, 5.3 GPa after compacted and sintered at 1250oC with the relative density of 95%. This phenomenon is believed to be related with the nanosize powder synthesized at high speed which has contributes the high strength of the sintered bodies.

Production and Characterization of Pulp from Banana Pseudo Stem for Paper Making via Soda Anthraquinone Pulping Process

2022 ◽  
Vol 58 ◽  
pp. 63-76
Author(s):  
Emiru Yidnekew Melesse ◽  
Tesfaye Kassaw Bedru ◽  
Beteley Tekola Meshesha
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Cooking Time ◽  
Pulp And Paper ◽  
Raw Material ◽  
Effect Of Temperature ◽  
Pulp Yield ◽  
Alternative Source ◽  
Paper Making

The need for pulp and paper currently in the whole world has become shooting up massively. The generation of the pulp, as well as paper from woody materials, has a challenge due to deforestation, huge chemical and energy consumptions. Now, an alternative source for paper is lignocelluloses wastes, because of low cost, low energy, and chemical consumption. Among them, the banana pseudostem was best for the input of pulp and paper production. This investigation was on the production and characterization of pulp from Banana Pseudo Stem for Paper Making via Soda Anthraquinone pulping process. The amount of cellulose (41.45%), ash (12.4%), hemicellulose (23.37%), extractive (12.72%), and lignin (10.46%) contents were obtained at the initial compositional evaluation of the pseudostem. It has excellent fiber length (1.75mm), fiber diameter (22.15μm), an acceptable Runkle ratio (0.55), and flexibility coefficient (159.64). The effect of temperature (130,140 and 150 °C), cooking time (45, 60, and 75 minutes), the concentration of soda (10, 12.5, and 15%), were examined. The maximum pulp yield and kappa number was 36.7% and 22.8 respectively obtained at 10% of soda concentration, at 150 °C, and 63 minutes of cooking time from oven-dried raw material. The produced paper from the banana pseudostem has a tensile index, tearing index, smoothness, and porosity were 78.75 Nm/g, 19.1 mN.m2/g, 500-530μm, and 50 sec/100ml air respectively. This study indicates that high strength mechanical property and good surface properties paper can be produced from banana pseudostem pulp with a more environmentally friendly pulping process.

scholarly journals Polymer Matrix Composite in High Voltage Applications: A Review

2021 ◽  
Vol 12 (6) ◽  
pp. 8343-8352
Keyword(s):  
Composite Materials ◽  
High Voltage ◽  
Low Cost ◽  
Natural Fibers ◽  
Weight Ratio ◽  
High Strength ◽  
Design Parameters ◽  
Shielding Effectiveness ◽  
Structural Composites ◽  
Low Thermal Expansion

In recent years, natural fibers have become more widely used as reinforcement in polymer composites to generate low-cost products. Fibrous reinforcements in polymer matrices lead to good mechanical and electrical properties for composite materials. Depending on the grade and orientation, composites can be one-fifth the weight of steel while offering similar or better stiffness and strength. In addition, unlike steel or aluminum, composites do not rust or corrode. Composite materials reinforcing phase gives durability, strength, and stiffness. Composite materials have traditionally been employed as structural materials. Composite materials are increasingly being used in electrical applications such as bushings, circuit breakers, coupling capacitors, and so on, thanks to the growing growth of the electrical sector. The design parameters for structural and electrical composites differ dramatically due to the enormous differences in property requirements. Depending on the application, structural composites. Structural composites prioritize sufficient strength and modulus, while electrical composites prioritize superior dielectric constant, thermal conductivity and low thermal expansion, and shielding effectiveness. In the electrical industry, low density is desired because it allows for weight reduction. It is also desirable to have a high strength-weight ratio and dielectric properties. This paper provides a brief review of the properties of polymer composite materials and their application in the high voltage industry.

Decomposition of the metastable beta titanium alloy Ti-15-3

1983 ◽  
Vol 41 ◽  
pp. 264-265
Author(s):  
Y. L. Chen ◽  
S. Fujlshiro
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Alpha Phase ◽  
Thick Sheet ◽  
Omega Phase ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Matrix ◽  
Metastable Beta ◽  
Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

UNS N09706

Alloy Digest ◽  
1989 ◽  
Vol 38 (2) ◽  
Keyword(s):  
High Strength ◽  
Heat Treating ◽  
Chromium Alloy ◽  
Good Resistance ◽  
Nickel Iron ◽  
Temperature Performance ◽  
Resistance To Oxidation ◽  
Oxidation And Corrosion ◽  
Iron Chromium Alloy ◽  
Iron Chromium

Abstract UNS N09706 is a precipitation-hardenable, nickel-iron-chromium alloy with high strength at temperatures to 1200 F and with good resistance to oxidation and corrosion over a broad range of temperatures and environments. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep and fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-368. Producer or source: Nickel and nickel alloy producers.

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