Cementless refractory concrete. Part 2. High alumina and corundum …
Chronology is considered for development of research and introductory work in the field of centrifugal casting, implemented in the production of quartz steel-pouring refractories.
Contrasts in gem corundum characteristics, eastern …
Corundum xenocrysts from alkaline basalt fields differ in characteristics and hence lithospheric origins. Trace element, fluid/melt inclusion and oxygen isotope studies on two eastern Australian corundum deposits are compared to consider their origins.
Corundum: Mineral information, data and localities.
ID Species Reference Link Year Locality Pressure (GPa) Temp (K) 0009325: Corundum: J, Schwarzenbach D, Flack H D (1982) Electric field gradients and charge density in corundum alpha-Al2O3 Acta Crystallographica A38 733-739 1982: 0: 293: 0009327: …
Elasticity of Corundum at High Pressures and …
1 Introduction. Corundum (Al 2 O 3) is a rock-forming mineral and shows wide applications in high-pressure experiments.It is widely used as a window material in dynamic shock-wave …
Intriguing minerals: corundum in the world of rubies and
This lecture text presents features of the fascinating mineral corundum and its gem varieties, ruby and sapphire. The geologic occurrences of its varieties and the best-known world localities are presented in detail. The mineralogy and crystallography of corundum, as well as its occurrence forms, are discussed. The origin of their colour …
Corundum (sapphire) and zircon relationships, Lava Plains gem fields
This metasomatized the sapphire (Fe/Mg ∼50–120, Ga/Mg ∼3–11), left relict metastable sillimanite-corundum-quartz and produced minerals enriched in high field strength, large ion lithophile and rare earth elements. The gem suite suggests a syenitic parentage before its basaltic transport.
FEATURE ARTICLES GEOLOGY OF CORUNDUM AND E G …
Primary corundum de-posits are subdivided into two types based on their geological environment of formation: (1) magmatic and (2) metamorphic. Magmatic deposits …
Corundum Properties: A Comprehensive Guide to This …
Corundum Meaning: The Mythology and Folklore of This Powerful Stone Mythology and Folklore. Corundum, known for its vibrant colors and high durability, has been used throughout history in various cultures. It's most popularly known as the mineral that forms the precious gems Ruby and Sapphire, each with its own unique lore.
Laboratory assessment of isothermal separation of V …
V containing spinel phase was successfully separated from vanadium slag by centrifugal casting. With the process parameters of G=900 (where normal gravity G=1), t=20 min and T=1557 K, almost all V ...
Separation of silver from bismuth melt in a centrifugal …
The heating furnace was heated by the resistance wire and had a cylindrical corundum chamber with the isothermal zone of 80 mm in length. ... A stable and adjustable high-gravity field was produced in the centrifugal separator which was driven with the speed-regulated motor. Especially, the equipment is also suitable for the separation of …
Centrifugal Field
Centrifugal Field + French database ID. 6,271 + French lore. Lorsqu'un Monstre de Fusion est détruit par l'effet d'une carte et envoyé dans le Cimetière, sélectionnez 1 des Monstres-Matériel de Fusion inscrits sur …
Ruby & Sapphire (1997) • Inclusions in Corundum
Examples: Rhombohedral twinning in corundum, quartz (amethyst) and calcite. Within corundum, polysynthetic twinning occurs parallel to the faces of the rhombohedron {1011}, which intersect each other at angles of 86.1 and 93.9° and meet the c axis at 32.4/57.6°. Repeated twinning in corundum is easily observed under the microscope.
Electric field gradients and charge density in corundum, …
Acta Crystallographica Section A: Foundations and Advances publishes articles reporting advances in the theory and practice of all areas of crystallography in the broadest sense. As well as traditional crystallography, this includes nanocrystals, metacrystals, amorphous materials, quasicrystals, synchrotron and XFEL studies, coherent scattering, diffraction …
Centrifugal Force
Centrifugal force is the apparent force that acts away from the center of a circular path. The force is always perpendicular to the direction of movement. The formula for centrifugal force is the same as for centripetal force: F c = mv 2 /r. However, centrifugal force acts in an equal and opposite direction.
Numerical investigation of particle behavior and erosion …
The simulation considers spherical solid particles (brown corundum) with diameters ranging from 0.3 mm to 1 mm and volume fractions of 15% and 5%. The flow field is calculated using the Navier-Stokes equations and the shear-stress-transport (SST) k …
KoMo Fidibus 21 Grain Mill
Description. Handmade in Austria, KoMo's Fidibus 21 grain mill is compact but powerful. Its attractive beechwood veneer cabinet houses a set of advanced corundum-ceramic burrs and a strong, high efficiency motor …
1. Introduction — Corundum documentation
1. Introduction . Corundum is an open-source, high-performance FPGA-based NIC and platform for in-network compute. Features include a high performance datapath, 10G/25G/100G Ethernet, PCI express gen 3, a custom, high performance, tightly-integrated PCIe DMA engine, many (1000+) transmit, receive, completion, and event queues, …
Cement-Free Refractory Concretes. Part 2. High-Alumina and Corundum …
In production of the majority of forms of high-alumina ceramic concretes in OAO Dinur there is use of Chinese bauxite (chamotte) having an Al 2 O 3 content predominantly within the limits of 88 – 90%. In addition, the content within them of alkaline and alkaline-earth oxides (Na 2 O, K 2 O, MgO, and CaO) is over wide limits, i.e., from …
Gem-corundum megacrysts from east Australian basalt fields…
Figure 5 Cr/Ga vs Fe/Ti diagram of magmatic corundum fields from LA-ICP-MS analyses (black outlines) and proton micro probe analyses (white outlines), with magmatic dividing line (dashed-dot line) after Figure 3. The high-Ga (magmatic) groups (4.1–6.5%) overlap ranges for ultramafic assemblages, including mantle ranges, and pegmatites ...
Corundum
Corundum is a crystalline form of aluminium oxide (Al2O3) typically containing traces of iron, titanium, vanadium and chromium. It is a rock-forming mineral. It is also a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its…
Fabrication of aluminum alloy functionally graded material …
The effect of a 5 T static axial magnetic field on the microstructures in solidified Al-96 wt.%Zn alloys at a cooling rate of 3 K/min. (a) The longitudinal and the corresponding transverse ...
Comparing Alumina and Corundum: From Raw Form to …
Both alumina and corundum exhibit high hardness and thermal resistance, making them ideal for abrasive and refractory applications. The color variation in corundum, due to trace impurities, contrasts with the typically white appearance of technical-grade alumina. The effectiveness of trace elements in coloring corundum …
Corundum: Use as a Gemstone, Abrasive, …
Diamonds: Learn about the properties of diamond, its many uses, and diamond discoveries. Corundum is used as a gemstone, abrasive, refractory and much more. Red corundum is a ruby, blue is a sapphire, …
The corundum conundrum: Constraining the compositions …
The Maniitsoq corundum occurrence of this study was previously described in Garde and Marker (1988), Yakymchuk and Szilas (2018) and Yakymchuk et al. …
Fundamental Investigation of Functionally Gradient Material
The corundum profile was measured and analysed by cubic order polynomial equation. A mathematical model based on the expression was proposed to consider the effects of the volume fraction of the powder and the centrifugal force on the distribution. The model can express the observed distribution fields in a unified manner.
A Quantitative Description of the Causes of Color in Corundum
Here we use corundum to present a comprehensive quantitative description of the causes of color in a gem material and illustrate its predictive power. Natural corundum has six major chromophores that cause color: Cr 3+, h •-Cr 3+, Fe 3+, h •-Fe 3+, Fe 2+-Ti 4+, and V 3+. We use synthetic samples doped with a single …
Centrifuge- Principle, Parts, Types, Uses, Examples
The centrifuge utilizes the sedimentation principle due to gravitational force. The centrifugation technique uses a centrifugal field to separate particles suspended in a liquid medium. These are put in the centrifuge's rotor either in bottles or tubes. Sedimentation is a process whereby gravity causes suspended particles to separate …