When the content of the binder phase in the cemented carbide tool is 5 to 7 mass %, the mean particle size of the hard phase is 0.6 μm to 1.0 μm, saturation magnetization is 9 to 12 μTm3/kg, the coercive force Hc is 15 to 25 kA/m, and the oxygen content is 0.045 mass % or less. Consequently, the resulting cemented carbide has high hardness and high toughness.



When the cemented carbide is used in a cutting tool, the resulting tool is excellent in wear resistance and fracture resistance. Because of low content of the binder phase, a work material made of a Ti alloy or a heat resistant alloy is less likely to be welded and thus it is possible to prevent chipping of the cutting edge due to welding and a become rough in surface roughness of the worked surface.


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The great performance of Tennis racket with tungsten alloy counterweight parts is reflected in high density, high tensile strength and hardness, good corrosion resistance and oxidation resistance, good mechanical properties, etc. High density is a prominent performance of tungsten alloy counterweight, the density of tungsten alloy is generally 16.5 ~ 18.6.0 g/cm ^ 3, which is more than twice that of steel density, at the same time in the increase of the weight of the volume to a minimum extent, that greatly improve the tungsten alloy counterweight design flexibility.

Environmental friendly performance is another important advantage of balancing tungsten alloy tennis racket.Tungsten alloy counterweight material has good corrosion resistance and oxidation resistance, will not cause harm to environment and human nature.It has a strict requirements on sports equipment.

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Cutting tools currently in use and including carbide for cutting relatively hard metal stock combine a steel shank with a relatively small carbide cutting tip brazed to one end of the steel shank. This construction has exhibited several serious shortcomings. For example, the heat of brazing apparently changes the temper or grade of the carbide and may cause the carbide to crack. Further, brazing provides somewhat of a weak joint between the two materials, this permitting the carbide to vibrate, which may result in chipping. Also, manufacturing the cutting tool in two parts and then joining those two parts together in a brazing operation drives the cost of the device up and provides a greater chance of error in the finished product.

A further disadvantage of the two-piece carbide tip, steel shaft construction is the limited life of the cutting tool. This limited life may result in a variety of ways. First, the carbide tip can only be trimmed back approximately 1/2 inch and this inherently limits its cutting capabilities. Second, the brazing joint may fail and thereby enable the carbide insert to break away from the shaft. Third, the shaft portion supporting the insert may completely shear or seriously bend. All three of these conditions render the cutting tool inoperable and risk the danger of the steel shank tearing against the metal stock, thereby causing serious damage to the stock.


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The connecting rod to the light displacer comprises, and is preferably formed from, a high density material of at least about 15 grams such that the connecting rod is heavier than the displacer alone. Such a heavy connecting rod provides the required reciprocating mass to match the reciprocating mass of the compressor piston, and the wobbling of such a heavy mass does not result in a significant undesirable vibration. The connecting rod can be more than three times the weight of the displacer.

Heavy connecting rod is provided by forming the rod of a tungsten alloy which has a density of 17 grams per cubic centimeter. Tungsten is particularly desirable for use in the connecting rod because it has a density of greater than 15 grams per centimeter, is machinable and has the strength required for a driving element.

In a specific embodiment, the compressor piston is about 22 grams and the displacer is only about 4 grams. By using a heavy tungsten connecting rod which is 18 grams, the total weight of the displacer assembly can be made to match the weight of the compressor piston.

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