Nanometer W and WC powders prepared from raw materials with different morphologies and structures all present different degrees of genetic characteristics of morphology and structure. The fine yellow tungsten particles obtained by high-power ball grinding grading treatment are small and loose in morphology and structure, making it easier to prepare nanometer W and WC powders with relatively loose structure and good dispersion.

Ultrafine tungsten carbide powderpellet characteristics and its influence on the abnormal growth of cemented carbide grain. The other batch of powder size distribution is uniform, with few aggregates. Two batches of tungsten powder were carbonized under the same conditions to prepare ultrafine tungsten carbide, and ultrafine cemented carbides of the same brand were prepared separately. The results show that tungsten carbide pellets inherit the basic characteristics of tungsten powder pellets, and the carbonization process will densify the pellets. Wet-grinding process can completely break and disperse the pellets of tungsten carbide, but a large number of nanoparticles with high activity, incomplete crystallization and serious defects will be generated, reducing the uniformity of the powder. The abnormal growth of superfine cemented carbide grain is directly related to the grain size of tungsten carbide.

Casting tungsten carbide powders with different preparation methods and particle sizes were added to fe-base alloy powder. The microstructure, phase composition and microhardness of alloyed layer were analyzed by metallographic microscope, SEM, XRD and durometer. The wear - resistant performance at room temperature was tested by wheel wear tester and compared. The results show that the cladding layer is mainly composed of leytenite, and the preparation method and particle size difference of tungsten carbide powder have important influence on the wear resistance of the composite. Tungsten carbide powder prepared by plasma rotating electrode atomization has the best wear-enhancing effect.

Related link

http://www.wococarbide.com/Library/libraryinfo/id/1159

Posted by: hannahgwendolyn at 09:49 AM | No Comments | Add Comment
Post contains 302 words, total size 2 kb.