Carbide file is a metalworking, woodworking and plastic working tool with carbide as its abrasive surface, and used to cut fine amounts of material from a work piece. It most commonly refers to the hand tool style, which takes the form of a steel bar with a case hardened surface and a series of sharp, parallel teeth. Most files have a narrow, pointed tang at one end to which a handle can be fitted.



Carbide files falls into various types by varying its sizes, shapes, cuts, and tooth configurations. The cross-section of a file can be flat, round, half-round, triangular, square, knife edge or of a more specialized shape.


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A gas-filled radiation detector is usually a glass tube that contains two concentric electrodes and a gas such as argon. Tungsten alloy materials are typically used for gas-filled radiation detector components, such as tungsten alloy tube and foil.

Tungsten alloy has a high atomic number and a high density, both of which give the metal unusually good absorption cross-section. This makes the tungsten alloy metal very sensitive to gamma rays. The tungsten metal is chemically stable to chlorine, bromine or other halogen gas used as a quench gas. In addition, since the environmental protection character of tungsten alloy, its can be widely used in gas-filled radiation detector.

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In a Geiger-Mueller radiation detector including a relatively large surface stainless steel cathode, a coating of chromium oxide on the interior surface of said cathode, an anode disposed in spaced apart relationship to said cathode in a sealed chamber, and the improvement comprising a liner in contact with the chromium oxide layer and consisting of a thin metallic tungsten alloy foil.

Due to the tungsten content of ≥ 90 wt.% the material exhibits excellent X-ray absorption. Furthermore tungsten alloy with respect to aging and degradation under X-ray radiation. The developed technology grantee that tungsten alloy foil thickness can be produced down to below 100μm. In Geiger-Mueller radiation detector, which the tungsten alloy foil has a thickness between about 1 and 2 mils.  

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In a Geiger-Mueller radiation detector(GM detector) including a relatively large surface stainless steel cathode, a coating of chromium oxide on the interior surface of said cathode. It has been found that a thin layer of tungsten alloy can be used on the inside surface of a cylindrical cathode to give a GM detector having high sensitivity and outstanding resistance to the halogen gas.

Furthermore, the tungsten alloy layer can be applied to the interior of a cylindrical cathode as a thin foil thus omitting the necessity of electro depositing the tungsten alloy layer on the interior surface.

Considerable significance is the fact that a stainless steel GM tube in which the interior surface of the cathode is coated with a thin layer of chromium oxide and a tungsten alloy foil liner possesses remarkable high temperature stability even though it is not subjected to the thermal cycling or bromine passivation techniques.

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The present invention provides improved spatial resolution (100 microns or less) for charge particle detection or cold neutron detection with extremely low sensitivity to other radiation such as x-rays or gamma rays, defining the time of the event within nanoseconds. Depending on how it the invention is implemented, the spatial resolution can be larger or smaller than 100 microns as desired. The present invention is simpler than existing methods for such applications. Due to the excellent radiation absorption of tungsten alloy, it can be produced into sheets and foils for a thickness range of below 0.1 until 4 mm in radiation detector. Higher signal of tungsten alloy radiation detector to noise ratio results in lower false detection rates and higher real detection. The scintillation end of the fiber can be made by ion implantation or thermal diffusion.

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A tungsten carbide drill bit is a device part made of carbide, attached to the end of the drill string that breaks apart, cuts or crushes the rock formations when drilling a wellbore, such as those drilled to extract water, gas, or oil.

The carbide drill bit is hollow and has jets to allow for the expulsion of the drilling fluid, or "mud", at high velocity and high pressure to help clean the bit and, for softer formations, help to break apart the rock. A tricone carbide bit as a improved design that comprises three conical rollers with teeth made of tungsten carbide. The teeth break rock by crushing as the rollers move around the bottom of the borehole. A polycrystalline diamond compact (PDC) bit has no moving parts and works by scraping the rock surface with disk-shaped teeth made of a slug of synthetic diamond attached to a tungsten carbide cylinder.PDC bits, which first came into widespread use, are used for gas and oil exploration in the North Sea. They are effective at drilling shale formations, especially when used in combination with oil-base drilling muds.


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A carbide dental drill is a small, high-speed carbide drill used during dental procedures, usually to remove decay and shape tooth structure prior to the insertion of a filling or crown. A carbide dental drill may also be used in the cleaning and shaping of root canals during endodontic treatment, or to remove old or temporary fillings or crowns prior to the insertion of new or permanent restorations.


Modern carbide dental drills can rotate at up to 400,000 rpm, and generally use hard metal alloy bits known as burs. Dental burs come in a great variety of shapes designed for specific applications. They are often made of steel with a tungsten carbide coating, or of tungsten carbide entirely. The bur may also have a diamond coating.


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Carbide dental bur is a type of cutter used in a dental drill, including three parts the head, the neck, and the shank. The carbide burs are made of tungsten carbide.
The heads of tungsten carbide burs contain the blades that remove material. These blades may be positioned at different angles in order to change the property of the bur. More obtuse angles will produce a negative rake angle which increases the strength and longevity of the bur. More acute angles will produce a positive rake angle which has a sharper blade, but which dulls more quickly. The heads of other commonly used burs are covered in a fine grit which has a similar cutting function to blades.

There are various shapes of burs that include round, inverted cone, straight fissure, tapered fissure, and pear-shaped burs. Additional cuts across the blades of burs were added to increase cutting efficiency, but their benefit has been minimized with the advent of high-speed handpieces. These extra cuts are called crosscuts.


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The initial carbide saw was a machine tool with a circular saw blade and silver soldered carbide tips. Some special carbide saws are listed as follow,

Plate Saw

It is developed by meaning of cutting plates made of high-strength carbon steel using carbide saw blades. The horizontal ways were mounted on a beam above the plate. Furthermore, a plate saw where the gearbox slid underneath the plate on a machine bed and cut the plate from below was produced.

Railroad Rail Saw

It is a special model of a carbide saw for miter cutting railroad rails for frogs and switches. Recently it has been developed to a special model which is integrated as a double saw in a railroad car and used for repair work of railroad tracks in the USA. It replaced abrasive saws which had been used before. Because these abrasive saws were guilty of causing forest fires due the hot chips and sparks, later these hazardous machines were replaced with cold saws.




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Layer Saw

A two layer saws that cut the ends of up to six "C" profiles. The profiles approached the saws horizontally, in layers. Specially a vertical design was produced later after that. The first saw cut the front ends, the second the rear ones, whereby the latter was movable on tracks and which therefore cut different lengths. These machines were built as pivot saws and cut from the bottom up through the profiles. It was also used for cutting tubes in layers.

Carbide hot saws

A carbide hot saw which cut off the ends on hot-forged axles.

Carbide Ring Saw

Thick-walled rings are hot-rolled and often have to be cut in slices. For different designs, such a saw could cut these rings from the inner diameter and also from the outside.


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