Zuhause >> Hartmetallkugeln >>Non-Magnetic Hartmetallkugel Tungsten carbide with high hardness, wear resistance, low coefficient of thermal expansion and good chemical stability and a series of excellent performance, are widely used in a variety of molds, such as tensile modulus, fasteners forging dies, plastic molds manufacturing. With the improvement of manufacturing and application technology, the carbide is extended applied for thermal recovery wells, sand wells. General carbide ball for ferromagnetic, during magnetic powder forming, easy to stick powder, produced nap, seriously affecting the dimensional accuracy and surface quality of magnetic blanks, and therefore should not be used mold magnetic powder. Since the non-magnetic ball is poor wear resistance, with its production of die life is typically only tens of thousands of times. Non-magnetic Hartmetallkugel to make it exponentially, ten or even a hundred times on life. non-magnetic Hartmetallkugel has grown to become one of the indispensable carbide species.

  

Types and characteristics of non-magnetic Hartmetallkugel
1.WC-Ni system. The system can be used to add tungsten powder or strictly controlled to reduce the carbon content of the carbon content, add some alloying elements, such as the composition of WC0·75AI·14.25Ni (%) alloy at room temperature is non-ferromagnetic, the flexural strength to 1670MN / mZ, hardness HRA87.4, but this WC-Ni alloy magnetic permeability rate is still high, so the domestic rarely used.
2.WC-Cr3C2-Ni system. Need to add 1% ~ 3% Cr3C2 when industrial production.
3.WC-Cr3C2-Mo-Ni system. Adding alloying elements Mo, Ta, AI, Co, etc., when the WC-Cr3C2-Ni system a small amount of Mo, WC will reduce the carbon content in the alloy, the non-conducive to the generation of a strong phase mayonnaise.

The principle of non-magnetic Hartmetallkugel
WC-Ni system is non-magnetic at room temperature are due to in the low carbon WC-Ni alloy, Ni-W alloy binder phase Curie point (354 ℃) were lower than the Curie point of WC-Fe alloy (1120 ℃ ), WC-Co alloy Curie point (770 ℃) , and the tungsten in the binder phase of nickel reduction in solubility with increasing carbon content, when the tungsten content of the nickel is greater than 17%, the Curie point of the WC-Ni alloy will be reduced to the Curie room temperature or less, when the chromium alloy elements more than 7.5% ,Mo is more than 8% , nickel is more than 12%, tantalum is more than 22%, respectively, by which they are composed of a binary alloy of nickel point fell to below room temperature, the preparation of high-strength non-magnetic WC-Ni alloy, need to reduce the carbon content to free carbon does not appear, then the strength of the alloy reaches the maximum.

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