The invention belongs to the production method of tungsten carbide based spherical thermal spraying powder in the production of hard alloy. Including WC as the substrate, Co or Co and Cr as the bonding phase, hexane as the ball grinding medium, paraffin as the pellet binder; And through: wet grinding preparation slurry, spray drying granulation, screening dry granule, sintering under the protection of hydrogen, finally sintered powder according to the requirements of classification, so as to obtain the object of spherical thermal spraying powder. The invention has the advantages of short process flow, regular powder morphology and good spherification, and the productivity can be increased by more than 20 times than the background technology, while the equipment investment is only one fourth of the background technology of the same scale. The production cost is low and can carry on the large-scale industrialization production and so on characteristic. It overcomes the disadvantages of large investment of background technology equipment, extremely low productivity, high production cost and can not be used in the production of cemented carbide spherical thermal spraying powder.

Compared with conventional materials, nanomaterials have unique properties in hardness, strength and toughness. The brittleness of nanostructured ceramics is reduced and the toughness is improved. Conventional nanocrystalline powder cannot be directly used for plasma spraying due to its low density, poor fluidity and small mass of individual particles, so it must be reprocessed. This article adopts the ball mill, pulp, spray drying and heat treatment method of Cr2O3 original nano powder together into suitable for thermal spraying with big particle spherical powder, different binder concentrations was studied, powder solids, spray drying conditions and the influence of heat treatment temperature on the physical properties of aggregate powder, measuring the apparent density of aggregate powder, tap density and liquidity, established under the condition of different dry air heating aggregate powder particle morphology of geometric model, discusses the morphology change process during the high temperature heat treatment, The ceramic powder was sprayed on the stainless steel substrate by dc plasma spraying method to prepare Cr2O3 wear-resistant coating. The powder and coating were detected and analyzed by metallographic microscope, scanning electron microscope and X-ray diffraction. The results showed that the size of aggregate powder particles after spray drying.

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