Chromium carbide

Chromium Carbide

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Chromium carbide

Chromium carbide (Cr

Chromium

Chromium is a chemical element which has the symbol Cr and atomic number 24. It is a steely-gray, Lustre , hard metal that takes a high polish and has a high melting point....
₃C

Carbon

Carbon is a chemical element with chemical symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalence?making four electrons available to form covalent bond chemical bonds....
₂) is an extremely hard refractory

Refraction (metallurgy)

In metallurgy, refraction is a property of metals that indicates their ability to withstand heat. Metals with a high degree of refraction are referred to as refractory....
ceramic

Ceramic

File:Bridge from dental porcelain.jpgFile:Qing vase p1070256.jpgA ceramic is an inorganic, nonmetal solid prepared by the action of heat and subsequent cooling....
material. It is usually processed by sintering

Sintering

Sintering is a method for making objects from Powder , by heating the material below its melting point until its particles adhesion to each other....
. It has the appearance of a gray powder with orthorhombic crystal structure

Crystal structure

In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. A crystal structure is composed of a motif, a set of atoms arranged in a particular way, and a lattice....
. Its CAS number is 12012-61-9. The orthorhombic Cr₃C₂ occurs extremely rarely as mineral tongbaite.

Other compositions are available, eg. Cr₂₃C₆ (occurring as extremely rare mineral isovite, cubic) and Cr₇C₃.

Chromium carbide is used as a thermal spray material for protecting the underlying metal surface, and as an additive to corrosion-resistant and wear-resistant materials.

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Encyclopedia

Chromium carbide (Cr

Chromium

Chromium is a chemical element which has the symbol Cr and atomic number 24. It is a steely-gray, Lustre , hard metal that takes a high polish and has a high melting point....
₃C

Carbon

Refraction (metallurgy)

In metallurgy, refraction is a property of metals that indicates their ability to withstand heat. Metals with a high degree of refraction are referred to as refractory....
ceramic

Ceramic

Sintering

Crystal structure

Bearing (mechanical)

A bearing is a device to allow constrained relative motion between two parts, typically rotation or linear movement. Bearings may be classified broadly according to the motions they allow and according to their principle of operation as well as by the directions of applied loads they can handle....
, seals, orifices, and valve seals, and as a fine-crystal phase in other sintered carbides, where, like the vanadium carbide

Vanadium carbide

Vanadium carbide, VanadiumCarbon, is an extremely hardness refraction ceramic material. It is commercially used in tool bits cutting tools. It has the appearance of gray metallic powder with cubic crystal structure....
, it inhibits growth of submicrometre grains during pressing and sintering. It is highly corrosion

Corrosion

Corrosion means the breaking down of essential properties in a material due to chemical reactions with its surroundings. In the most common use of the word, this means a loss of electrons of metals reacting with water and oxygen....
-resistant, and does not oxidize even at high temperature (1000-1100 °C). The powder for coating costs $40-$65 per pound.

The thermal expansion

Thermal expansion

Thermal expansion is the tendency of matter to change in volume in response to a change in temperature. When a substance is heated, its constituent particles move around more vigorously and by doing so generally maintain a greater average separation....
coefficient of chromium carbide is almost equal to that of steel

Steel

Steel is an alloy consisting mostly of iron, with a carbon content between 0.2% and 2.14% by weight , depending on grade. Carbon is the most cost-effective alloying material for iron, but various other alloying elements are used such as manganese, chromium, vanadium, and tungsten....
, reducing the mechanical stress buildup at the layer boundary.

Precipitation of chromium carbide at the grain boundaries, depleting the grain edges of chromium, is the cause of intergranular corrosion

Intergranular corrosion

Intergranular corrosion , also termed intergranular attack , is a form of corrosion where the boundaries of crystallites of the material are more susceptible to corrosion than their insides....
of stainless steel

Stainless steel

In metallurgy, stainless steel is defined as a steel alloy with a minimum of 10% chromium content by mass. Stainless steel does not stain, corrode, or rust as easily as ordinary steel , but it is not stain-proof....
near the weld

Weld

Weld most commonly refers to a joint formed by welding. Weld may also refer to...
s.

Physical Properties:

Density
Density

The density of a material is defined as its mass per unit volume. The symbol of density is ....
( kg/m³ ): 6,650-6,680 (Cr₃C₂)
Melting point
Melting point

The melting point of a solid is the temperature range at which it changes states of matter from solid to liquid. At the melting point the solid and liquid phase exist in equilibrium....
( °C ): 1250 (Cr₂₃C₆), 1665 (Cr₇C₃), 1890 (Cr₃C₂).

Chromium carbide

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