Pakalipano, pali magulu angapo akuluakulu a njira zowonongeka kwa tungsten carbide.Imodzi ndiyo njira yotchedwa kutentha kwapamwamba kwambiri, yomwe imaphatikizapo: njira yosungunuka ya saltpeter, njira yopangira mpweya wa okosijeni, njira ya oxygen calcination, etc.;ina ndi njira yophwanyira makina, momwe ...
Werengani zambiri