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Mosten Alloy Co., Ltd.

Development of tungsten

  • Mosten
  • 19 Mar

The preparation method of the compact W is mainly divided into the melting method and the powder metallurgy method, which is limited by the melting point of W to 3 410 DEG C, and the method for preparing the W is mainly the powder metallurgy method. The smelting process is generally used for the preparation of WC and W slag purification. With the development of science and technology, in addition to the traditional liquid-phase sintering process, the process of low-temperature sintering, instantaneous liquid-phase sintering and microwave sintering has been developed to obtain the fine-grained microstructure. The conventional powder metallurgy method for preparing low-grade W and W alloy is prepared by the following steps of: preparing a mixture of W powder or W powder and other non-metal powder as raw materials, and forming and sintering to obtain various types of products. Cordero et al.[19] The ultra-fine-grained tungsten alloy with a grain size of 130 nm was prepared by a rapid discharge plasma sintering method after ball milling, and the hardness can reach 12 GPa and the dynamic impact strength is 4.14 GPa. the high-density and high-performance W product is prepared by preparing the nano powder of the target product and then sintering to obtain the 90W7Ni3Fe nano composite powder by mechanical alloying, Then the tungsten alloy with the grain size of 3-5 & mu; m can be obtained after the low-temperature sintering at the temperature of about 1 400 DEG C, and the tensile strength of the tungsten alloy reaches 1,130 MPa. As an important part of the joint, W is an important part of the joint, and it canundefinedt ignore the influence of it on the forming of the welding joint, the formation of the brittle phase and the mechanical properties of the welded joint.

Tags :
W tungsten