What is red corundum? The difference between red corundum and ruby

Recently, many people asked us, "what is red corundum? Is it a ruby? " Today, we will answer this question with you.

First, what is red corundum? Let's take a look at the explanation on the Encyclopedia: "red corundum has purple color and strong hardness, which is suitable for making cutting Abrasives". The main ingredients are α－ Is "alumina" familiar? In fact, if we want to say another name, we will be more clear - chrome corundum. yes! Red corundum is chrome corundum. At present, most of the red corundum in the market is synthetic: red corundum ("chrome corundum") increases 22% chromium on the basis of white corundum, which is melted in electric arc furnace, and its color is purplish red. The hardness is slightly higher than that of brown corundum, which is similar to that of white corundum, and the microhardness can be 2200-2300kg / mm2. The toughness is higher than that of white corundum and slightly lower than that of brown corundum. The abrasives made by it are suitable for grinding high carbon steel, high-speed steel and its thin-walled parts. The abrasives can also be used as grinding and polishing materials, precision casting molding sand, spraying materials, chemical catalyst carrier, special ceramics, high-grade refractory materials, etc.

Here's the point! Is red corundum a ruby? The answer is yes. Red corundum is a natural unprocessed ruby. Just as the gem grade diamond is called diamond, the gem grade red corundum is also called ruby. Since ancient times, ruby embodies three main characteristics of high-grade Gemstones: charming beauty, excellent durability and extremely rare.

So what are the differences between red corundum and ruby? Here came to tell you.

The color of red corundum is purplish red with strong hardness. It is mainly suitable for making cutting abrasives. The main component of red corundum is α－ Alumina, commonly known as chrome corundum. The hardness of red corundum is higher than that of brown corundum; Toughness is higher than that of white corundum. The abrasive tools made from it are suitable for grinding high carbon steel, high-speed steel and its thin-walled parts. The abrasive can also be used as grinding and polishing materials, precision casting molding sand, spraying materials, chemical catalyst carrier, special ceramics, high-grade refractory materials, etc.

Ruby is corundum in red, dark purple, purplish red and orange red. Its main component is aluminum oxide. Ruby is very hard, and its hardness is only below that of diamond. The chemical composition of ruby is aluminum oxide and contains a small amount of chromium, iron and titanium. It is red to pink because it contains trace element chromium. The color distribution is often uneven, with color bands or color patches. The crystal morphology is often barrel, short column, plate, etc; With straight crystal growth lines. The aggregate is mostly granular or dense block. The hardness is 9, second only to corundum; No cleavage, cleavage development; It is brittle. The density is 3.95-4.1g/cm3, and the specific gravity is 3.97-4.05. Transparent to translucent; Glass luster. Refractive index 1.76-1.77, birefringence 0.008 -0.010. Dichroism is obvious and it is heterogeneous. Under the irradiation of long and short wave ultraviolet rays, it emits red and dark red fluorescence: those with high chromium content have strong fluorescence. In the visible light absorption spectrum, there are obvious absorption lines at 694.2nm and 682.8nm in the red region: from 620 to 540nm, there is a wide absorption band; There are weak absorption lines.

The role of corundum is not only for abrasives: the main chemical component of corundum is alumina. Under the high temperature condition of the mantle, it is formed with magma ejecting from the surface. Corundum is rich in color, including red, orange, yellow, green, cyan, purple and other colors. Its hardness is very high, second only to diamond. Corundum is mainly used for advanced grinding materials, bearing materials of watches and precision machinery. Corundum minerals mainly include Ruby and sapphire.

Our daily corundum products mainly include corundum tube, corundum brick, corundum crucible, brown corundum, corundum powder, corundum sand, corundum ball, red corundum, zircon corundum, white corundum, blue corundum, black corundum, corundum ceramics, corundum powder, corundum sand sheet, etc.

Corundum is formed by the contact metamorphism between aluminum rich magmatic rocks and limestone or the regional metamorphism of aluminum rich and silicon poor rocks. It is often produced in crystalline limestone, mica schist and gneiss, as well as syenite, nepheline syenite, pegmatite and basalt. Due to its high hardness and weathering resistance, corundum mostly appears in placer.

Corundum, which cannot be used as gem, has been used as abrasive, commonly known as emery, mainly produced in Greece, the United States and Australia; Gem grade corundum is mainly produced in Sri Lanka, Thailand, Cambodia and so on.

Corundum is mainly formed under the condition of high temperature aluminum rich and silicon poor. In endogenesis, it occurs in magmatic rocks and pegmatites rich in aluminum and poor in silicon, and coexists with feldspar and spinel. In metamorphism, those occurring in gneiss coexist with skarn, magnetite and muscovite; Those produced in the contact zone between magmatic rock and limestone coexist with calcite, magnetite and epidote, which is the product of desilication of magmatic rock. It belongs to the trilateral crystal system, and the crystal form is often in perfect hexagonal column or barrel. Oblique stripes or transverse stripes are often developed on the cylinder surface, and triangular cracks are sometimes seen on the bottom surface; The aggregate is granular.

Corundum has the properties of high temperature resistance, corrosion resistance and high strength. Its hardness is very high, second only to diamond; Corundum has high melting point and high high temperature insulation. It is a good refractory. Corundum products have good air tightness and have been widely used in electric vacuum environment. Its excellent high-temperature properties and mechanical strength are widely used in metallurgy, machinery, chemical industry, electronics and other important fields.

Red corundum is powerful, fierce and full of stamina. Red corundum can replenish blood gas and treat cold hands and feet. Can let shy, timid, introverted people, increase courage, self-confidence, and can dare to express themselves, no longer timid. Wearing by public relations or business personnel can increase persuasion, personal charm and strengthen leadership temperament. Improving interpersonal relationships and strengthening courage can enhance self-confidence. It has the energy of prosperity and contributes to health and longevity.

BRIEF INTRODUCTION

Henan Yuteng Grinding Material Co., Ltd. is located in Kaifeng City, Henan Province. Is a set of production, research and development, service as one of the grinding agent, grinding, polishing products professional company, specializing in the production and sales of coated grinding tools derived ancillary products: flocking sand disc, blade, all kinds of special-shaped grinding disc, sponge grinding block, steel paper disk, ring sand belt, sand ring and automotive polishing products.

Our main products are velcro disc,Abrasive Paper,Fiber Disc,Flap Disc,Abrasive Cloth,Abrasive Belt.

Relying on the advantages of the industrial base, the company has advanced production equipment and strong technical force, complete testing equipment to ensure that the products are sharp, wear-resistant and high strength, and the product quality reaches the advanced level of similar international products.

Our products can be used for all kinds of metal watches and stainless steel, alloy steel, non-alloy steel, non-ferrous metals, titanium alloy and other grinding and wire drawing, polishing and so on; Wood, high-medium fiberboard, flower board, composite board, glass, rubber and other table grinding and polishing. Widely used in automobile, steel, building materials, shipping, aviation, wood, plastic , leather and other industries.

We provide customers with the best surface treatment program, according to the actual needs of customers "tailored" a variety of specifications of sand pan, sand belt, sand carbon and emery cloth ring polishing products.

The company's flexible operating mechanism and all customer-centric concept, we in addition to provide you  standardized, serialized products, but also according to your special requirements, for you to manufacture high-quality, personalized non-standard coated with abrasive products.