Self Propagating High Temperature Synthesis Method

The process of preparing tungsten powder by SHS is carried out in a home-made reactor and argon atmosphere, and tungsten filament parallel to the surface of the sample is used as the ignition source. After combustion, the product was soaked in 10% HCl (excess 30%) solution for a certain period of time and then washed to neutral by deionized water, At the same time, no Ca²⁺ and Mg²⁺ were identified in the filtrate, and then dried to remove MgO and CaO. The resulting Surface Milling Inserts filter residue was leached with 5% NaOH and then filtered, washed with water to neutral and rinsed with 10% HCl. After repeated drying, the tungsten powder was obtained. The XRD, SEM and particle size distributions of the products after combustion and after leaching showed that: By means of self propagating reduction method, the average particle size was 0.87 um and the specific surface area was 1.09m2/g, the purity bigger or equal to 99.0% tungsten powder.