when tennis players played, designed to control the ball as much as possible the maximum points.When a ball is hit by the location best suited, and this are known as "sweet". In addition, if a player tries to hit the ball squarely, racket head normal to the direction of flight of the ball. So if both players use the same rackets, and two different players swing the same racket is slightly different.In addition, due to the weight of the tennis racket and made with the overall structure is fixed, only in this way can implement different rackets have a different weight or weight distribution.Tungsten alloy counterweight applies to needs of such material.

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tungsten alloy fishing sinker is a kind of tungsten alloy material used in the production of fishing tackle. Since the good performance of tungsten alloy fishing sinker, which are density, small size, shapes, its good for every section of choice. Tungsten alloy fishing sinker that is high density, corrosion resistance, hardness characteristics, made of tungsten alloy counterweight become the preferred manufacture fishing sinker materials.

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There are four parts barrel, dart cylinder head, shaft, and flights of one dart. Barrel parts made of tungsten alloy, so call darts tungsten heavy alloy dart. Focus area of the Dart is Barrel, Dart-throwing control area, is made of tungsten alloy counterweight material.For darts, and high density is very important, because the density of darts could make dart center more stable, so the darts for high precision machining is necessary. Tungsten heavy alloy become the most popular material to made darts ,as the reason of wear-resistant because of high density tungsten alloy and form the barrel-shaped compact group.

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Nowadays, tungsten alloy counterweight material is mainly used for darts, fishing sinker, golf accessories, hand weights, ski balance weights, tennis rackets, badminton racket counterweight and so on.This article will give brief description of tungsten alloy counterweight used in some related products.

Tungsten alloy counterweight material become more widely used in sports fields. Due to its great performance of the high density and small volume, high melting point and has high hardness, excellent resistance to abrasion and high ultimate tensile strength, high toughness, good machinability, non-toxic, high impact resistance and crack resistance and environment-friendly.

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A carbide downhole tool comprises a tubular body for location in a tubular member, such as a drill string, and defines a through bore and a number of circumferentially spaced ports . A valve member which may be in the form of a piston sleeve is mounted in the bore and is movable relative to the body between a first position in which fluid may flow through the port and a second position in which the valve member closes the port , the valve member being movable between the first and second positions by application of differential fluid pressure. Movement of the valve member is provided by a cam arrangement including a circumferentially extending cam groove and a cam follower .


A method for fabricating a carbide composite for a downhole tool, comprising: depositing a first layer on a substrate, the first layer comprising one or more first carbides, first metal binders, first organic binders, or a combination thereof; depositing a second layer at least partially adjacent the first layer, the second layer comprising one or more second carbides, second metal binders, second organic binders, or a combination thereof, and wherein the first and second layers have a different particle size, particle shape, carbide concentration, metal binder concentration, or organic binder concentration from one another; and binding the first and second layers to form the carbide composite.


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Carbides drilling tools are extremely hard, and can drill virtually all materials while holding an edge longer than other bits. The material is expensive and much more brittle than steels; consequently they are mainly used for drill bit tips, small pieces of hard material fixed or brazed onto the tip of a bit made of less hard metal. However, it is becoming common in job shops to use solid carbide bits. In very small sizes it is difficult to fit carbide tips; in some industries, most notably PCB manufacturing, requiring many holes with diameters less than 1 mm, solid carbide bits are used.

A method of making drilling inserts by mixing nodules of pre-blended, un-sintered metal carbide/binder composites having certain desirable characteristics such as a very high hardness, oxidation resistance or gall resistance, and dispersing these nodules into other pre-blended, un-sintered and pelletized metal carbide/binder compositions having other desirable characteristics such as high toughness, corrosion resistance, or other property. The dispersion of the first composite into the second composite occurs prior to pressing and sintering of the mixture. In this manner, the integrity of the separate grades is maintained, while the properties of the new composite are enhanced.

 
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WC/Co cemented carbide is the most common material for rock drilling due to its superior combination of toughness and hardness. A cemented carbide rock drill button with 94-wt.% WC and 6-wt.% Co was sliding against polished granite, magnetite, hematite, quartzite, mica schist, leptite and sandstone in a pin-on-disc tribometer. When the test was performed in 25 °C and 350 °C air and also in 25 °C water. The load was chosen to 20 N (which is considerably lower than required for crushing the rock) and the sliding velocity was 0.26 m/s. The relationship between the known wear behaviour against different rock types and the corresponding sliding friction performance is listed as follows,

At 25 °C, the cemented carbide exhibited the highest stable dry friction against mica schist, and the lowest against leptite. At 350 °C, leptite gave the highest friction and hematite the lowest. In water, granite showed the highest friction and quartzite the lowest. A “remaining water lubricant effect” was noticed where mica schist was able to keep low, water lubricated friction value even when seemingly run dry, while leptite, sandstone and hematite were not.

 
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A carbide drilling rig, comprising: a drill string containing at least one section of pipe; a drilling tool connected to said drill string and containing at least one carbide component; and surface equipment capable of rotating said drill string and drilling tool; wherein the carbide component comprises a body portion of carbide and an outer layer which is attached to said body without a transition layer or adherent material and which contains an ultra-hard material.

A fabrication method for a carbide drilling tool, comprising the steps of: forming a body portion comprising tungsten carbide; sintering body portion sufficiently to permit handling of body portion for further processing; applying a coating to a working surface of said body portion, coating comprising an ultra-hard material; after said applying step, subjecting said body portion and coating to a high temperature, high-pressure process to form a finished carbide component; and installing finished carbide component in a drilling tool.
 

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Use high density materials to produce High Explosive-Anti-Tank cover, such as tungsten alloy counterweight, to enhance piercing projectile power, then replace the traditional copper shaped charge liner materials.In order to meet the needs of future war, and is being studied in many countries of the world.United States, Ken Fok company,comparison with copper hood,tungsten-copper-nickel armor-penetration depth of liner more than 31%,comparison with copper hood.Germany, and France's researchers had also confirmed this, with tungsten alloy formed by tungsten shaped charge liner with two characteristics of the shaped charge liner with high performance.High density and high elongation of the Jet before breaking led its extension.

Tungsten-copper-nickel alloy liner shaped charge on homogeneous armor penetration will increase 38%, forming the Jets better than the tensile properties of the copper Jet, but it must be noted that tungsten-copper-nickel alloy liner is not the density, the higher the better the armor, it is important to ensure materials have good uniformity.Uniform density distributions of a single CAP, no defects, experiments show that material with tungsten-copper-nickel alloy liner to enhance penetration power is very effective and feasible.

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Tungsten heavy alloy(WHA) balance weight of racing car is now becoming the most popular material for ballast, due to its main advantages as follows:

Highest density: Adding WHA balance weight into the whole framework of aracing car is helpful to optimize the performance of the racing car during the racing progress, which contributes to the better control of the car’s movement.

High tensile strength and good creep resistance: Tungsten has high tensile strength and good creep resistance with a high mass/size ratio, so it will be the ideal to work in are strict space. Its high density also gives enhanced sensitivity by increasing the control of load distribution.

Machined Easily: WHA is also easily machineable which gives designers greater flexibility in deciding on the final shape of components and offer designers several advantages over conventional balance materials e.g. lead or steel.

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