Method for preparing nanometer WC-Co composite powder through high-temperature spray drying short process

Abstract

The invention discloses a method for preparing nanometer WC-Co composite powder through high-temperature spray drying short process. The method comprises the steps that water-soluble ammonium metatungstate, water-soluble cobalt salt and a water-soluble carbon source serve as a raw material; the raw material is added to a heated and stirred container containing pure water to be prepared into slurry; the slurry is delivered to a closed type centrifugal high-temperature spray drying tower of which nitrogen is introduced through a feed pump to be dried; the spray dried precursor material is crushed and screened and then is subjected to reduction and carbonization; the reduced and carbonized material is crushed and screened through air flow and finally is blended to obtain the WC-Co composite powder. The nanometer WC-Co composite powder prepared through the method is stable in property, single in phase, uniform in ingredient, narrow grain size distribution and fine in grain, powder ingredients are controlled easily, and the method belongs to the process through which industrialized and mass production can be achieved.

Description

technical field [0001] The invention belongs to a method for preparing raw material powder used in ultrafine cemented carbide production, which is a method for preparing nanometer WC-Co composite powder by adopting water-soluble method, high-temperature spray drying, carbothermal in-situ reduction reaction and short process. The nano-WC-Co composite powder prepared by this method can be used to prepare ultra-fine cemented carbide, which can be applied to dot matrix printer drills, integrated circuit board micro-drills, high-precision CNC machining drills and milling cutters, medical dental drills, and cutting tools for difficult-to-machine materials. Background technique [0002] In order to meet the requirements of highly integrated, light and thin, miniaturized, crash-resistant, electromagnetic shielding, heat dissipation and other requirements of 3C products, at the same time, the number of layers of the main board (PCB) of 3C products is increasing, and the diameter of PC...

AI Technical Summary

Problems solved by technology

The method of open spray drying-calcination preparation has the following problems: the precursor powder is easy to absorb moisture and gelatinize; the material is easy to stick to the material box during the calcination process; the precursor powder is easy to form a foamy structure oxide during the calcination process; the precursor calcination process The volatiles in the medium will corrode the equipment to a certain extent and reduce the service life of the equipment

[0005] At present, there is no method of using high-temperature spray drying, closed centrifugal spray drying tower, and nitrogen gas to prepare precursor powder, and there is no method to control the quality in the production process of WC-Co composite powder, especially the grain size and particle size distribution. , water content, oxygen content and sintered bowls and boats, etc.

Images