Compared with ordinary polygonal tungsten powder, spherical WC powder has more remarkable characteristics, such as more stable chemical composition, more uniform and dense structure, higher hardness, better toughness and wear resistance, etc., so it is more suitable for thermal spraying field middle. In order to further improve the overall quality of the existing spherical WC powder and reduce production costs, a new preparation method will be introduced below, and the specific steps are as follows:
(1) Establish a stable argon plasma torch; (2) Use the carrier gas to inject cast tungsten carbide powder into the high-temperature zone of the core of the argon plasma torch for heating; (3) Cool the tungsten carbide powder particles formed after heating Solidify to form spherical tungsten carbide powder; (4) extract the gas and collect spherical tungsten carbide powder.
The precautions for this production method are:
1) Establish and operate the argon plasma torch, including the establishment of the argon plasma torch. At this time, the pressure of the main working gas argon and the auxiliary working gas hydrogen are both 0.5MPa~0.8MPa, and the power loaded on the induction coil is 20KW~50KW The pressure of the main working gas argon and the auxiliary working gas hydrogen when the argon plasma torch runs stably is 0.5MPa～0.6MPa, and the absolute value of the system negative pressure is 110mm mercury column～230mm mercury column.
2) The average particle size of the cast tungsten carbide powder added is 25um, the pressure of the carrying gas is 0.6MPa~0.8MPa, the flow rate of carrying nitrogen gas is 400L/h~800L/h, and the feed control flow rate of the cast tungsten carbide powder is 35g /min~55g/min.
The method of Baoji Yusheng Metal Technology Co., Ltd. solves the problems of poor fluidity, low bulk density, and poor performance caused by irregular shapes such as flakes, strips, and plates in traditional cast tungsten carbide powder.
