Experimental and numerical analyses of pure copper …

2014-2-1 · Vickers micro-hardness (HV) measurements for the coarse and ultra-fine grained samples have been carried out to evaluate the influence of process and pass number on the hardness behavior of material. It is found that the first pass of extruded pure Cu make the hardness value to suddenly increase from 68 HV to 109 HV.

Direct Compression in Tablet Manufacturing

2019-11-5 · Direct compression is a simple, easy to control and least expensive stamping process. The direct compression has only two main steps, dry mixing and tablet compression. The method of wet particle rubbing has 4 additional steps: Wet mixing, particle rubbing, drying, particle repair. Not only does that require more equipment, machinery, space ...

Frictional experiments of dolerite at intermediate slip ...

2011-7-26 · The samples were shaped by a surface grinder machine so that the variation in the thickness within a sample is less than 10 μm. 2.3. Experimental Procedure 2.3.1. Experiments With HTVR [12] The experiments using HTVR have been conducted at a normal stress, σ n = 1 MPa and a slip rate, V = 0.010 m/s.

Coatings and surface modification technologies: a finite ...

2005-8-4 · Ultra thin films are used for micromechanical applications, and their mechanical properties are of interest. ... The dried surface has a high level of fine porosity. For a more detailed description of surface modification techniques see, for example [6, 7]. A comprehensive treatment of material and mechanical properties of coatings is also ...

Biological evaluation of ultra-fine titanium with improved ...

2015-12-7 · Prog Mater Sci 51:881–981. Article Google Scholar 16. Kubina T, Dlouhy J, Kover M, Domankova M, Hodek J (2015) Preparation and thermal stability of ultra-fine and nano-grained commercially pure titanium wires using conform equipment. Mater Tehnol 49:213–217. Article Google Scholar 17.

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Missouri University of Science and Technology Scholars'' …

2021-8-19 · ultra-fine particles of a material using high-pressure fluid. More particularly, the present invention relates to a method for Subjecting particles to a high-pressure fluid jet, high turbulence condition, cavitation and collision to comminute the particles. 2. Related Art . Comminution may be defined as either a Single or mul

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Sustainable use of normal and ultra-fine fly ash in mortar ...

2021-11-10 · The cost of fly ash was found to be one third of that of cement cost. The cost of ultra-fine fly ash is 66.6% expensive than that of cement. The cost of UFFA was more as is manufactured using grinding and filtering technique. The normal fly ash is grinded and filtered to desirable size in industrial mills to get the ultra-fine particles of fly ash.

A Comprehensive Review of Ultra-Fine Materials as ...

2020-11-24 · Early age strength is possible with ultra-fine materials such as ultra-fine fly ash and ultra-fine slag in cement concrete. Due to smaller particle size they react much faster and impart better early strength in cement concrete. This paper critically reviews the feasibility of ultra-fine material usage as supplementary cementitious materials.

Laser engineered net shaping of WC-9.2wt%Ni alloys: A ...

2020-1-1 · A design of experiment matrix was successfully applied to the LENS® technology to produce a series of WC-9.2wt%Ni (Monel) thin walls and cubes. The alloys were characterised using scanning electron microscopy, energy dispersive spectroscopy, electron probe micro-analysis, Vickers hardness, X-ray diffraction and porosity.

Orientation mapping of nanostructured materials using ...

2012-9-1 · 1. Introduction. For many years materials scientists have been interested in developing processing techniques to produce ultra fine-grained and nanostructured materials, due to the enhanced physical properties that such materials offer,, .Predominantly it is the combination of high strength and plasticity in ultra fine-grained metals that has generated the greatest …

Influence of grain refinement on the corrosion behavior of ...

2021-7-18 · Grain refinement can strengthen the mechanical properties of materials according to the classical Hall-Petch relationship but does not always result in better corrosion resistance. During the past few decades, various techniques have been dedicated to refining grain, along with relevant studies on corrosion behavior, including general corrosion, pitting corrosion, and …

Recent Developments and Research Issues in …

2011-4-4 · Demand for micromachining has been on the rise in recent years owing to increasing miniaturization. Production of parts in microscale, especially with brittle materials, is challenging. Ultrasonic micromachining has been gaining popularity as a new alternative in fabrication of such parts. The process gives a machining option for geometrically challenging and/or brittle …

Characterization of accumulative fold-forged magnesium ...

2020-9-1 · 1. Introduction. The ultra-fine grained (UFG) and nanostructured (NS) materials are defined as the two new classes of advanced materials considering their average grain sizes in the ranges of 100–1000 nm and <100 nm, respectively [].Various metals and alloys with UFG or NS structures are under development for several practical applications considering their superior …

Thermal Stability of Ultra-fine Grained AZ31 Magnesium ...

2011-12-14 · Thermal Stability of Ultra-fine Grained AZ31 Magnesium Alloy Processed by Severe Plastic Deformation . J. Vrátná and M. Janeček . Charles University Prague, Faculty of Mathematics and Physics, Prague, Czech Republic. Abstract. The microstructure of ultra-fine grained (UFG) magnesium alloy AZ31 and its development with temperature were ...

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Power predictions for a pilot scale stirred ball mill ...

1996-3-1 · References Heim, A. and Leszczyniecki, R., 1985. A study on grinding and energy input in a vertical multi-disc batch pearl mill. Aufbereitungs-Technik, 11: 619-624. Herbst, J.A. and Sepulveda, J.L., 1978. Fundamentals of fine and ultra-fine grinding in a stirred ball mill.

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Silver nanoparticles: Synthesis, medical applications and ...

Laser Ablation Method. Laser ablation method refers to a pulsed laser instantaneously heat the target bulk metal immersed in water or an organic solvent to form plasma plume, followed by nucleation and growth of metal particles during the plasma plume cooling process and eventually form nanoscale clusters [62, 64].During the process of laser ablation, nanoparticles can …

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Korean Journal of Chemical Engineering | Volume 23, issue 6

2006-11-1 · Ultra-fine grinding mechanism of inorganic powders in a stirred ball mill — The effect of grinding aids Authors. Hee Kyu Choi; Woo Sik Choi; Content type: Erratum; Published: 01 November 2006; Pages: 1067 - 1067

Increased Dividend Reflects Strong Operating Performance ...

2019-11-6 · Barrick is at the forefront of ultra-fine grinding of partially refractory sulphides to enhance the extraction of gold at its African operations. ... 881. …

Influence of alloying element Zn on the microstructural ...

2017-12-1 · Deformation behavior of ultra-fine-grained Mg-0.3 at% Al alloy in compression J. Alloys Compd., 726 ( 2017 ), pp. 651 - 657 Article Download PDF View Record in …

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