Preparing method of composite tungsten cobalt oxide powder

Abstract

The invention discloses a preparing method of composite tungsten cobalt oxide powder. Ammonium meta-tungstate, cobalt salt and EDTA powder are added according to a certain proportion to be evenly mixed, and then, the mixed powder is added into ionized water to have a react, so that a composite tungsten cobalt solution with the tungsten cobalt ratio meeting the technology is obtained; then, mist spraying, drying, granulating, drying and forging are carried out, and the composite tungsten cobalt oxide powder with the uniform component, the freely-adjusted cobalt content and accurate control can be obtained; and the method is simple in technology, short in technological process, small in energy consumption, high in production efficiency, free of ammonia-nitrogen wastewater pollution, precise in control, capable of meeting the higher industrial production requirement, and capable of being widely applied to production of various kinds of hard alloys.

Description

technical field [0001] The invention relates to the preparation of cemented carbide powder in the field of metal materials, in particular to the preparation of powder of composite tungsten-cobalt oxide. Background technique [0002] Cemented carbide is mainly made of rare metals such as tungsten, cobalt, and titanium. It has special properties such as high hardness, high density, and wear resistance. It is widely used in many fields such as machinery manufacturing, oil exploration, military industry, and aerospace. Traditional cemented carbide preparation methods mainly use fixed bed, rotary furnace, hydrogen plasma and other methods to reduce tungsten oxide to tungsten powder by hydrogen, mix tungsten (W) powder and carbon (C) powder by ball milling, and undergo high temperature carbonization. Tungsten carbide (WC), and then mixed with prefabricated cobalt powder by ball milling to obtain tungsten carbide-cobalt (WC-Co) cemented carbide mixed powder, and then prepared cemen...

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Problems solved by technology

Since metatungstic acid is a very unstable medium-strong acid, it is easy to precipitate yellow insoluble matter (a hydrate of tungsten trioxide) at room temperature, so the storage and transportation of metatungstic acid is very inconvenient. It is used to prepare tungsten Cobalt composite oxide and metatungstic acid solution will precipitate, which will inevitably affect the actual yield of the production process and the accuracy of cobalt matching; secondly, the EDTA powder and CoCO 3 The powder is added to the tungsten-cobalt composite solution. EDTA (ethylenediaminetetraacetic acid) is a strong complexing agent, which can be well complexed with Co in a liquid environment. Co 2 The formation of EDTA complex can ensure the uniform distribution of metal ions in the solution, so that the tungsten-cobalt ratio can be controlled in a narrow range, and the obtained composite tungsten-cobalt oxide powder has better uniformity, cobalt content higher than 7% and It can be adjusted arbitrarily within a certain range, and the control is relatively accurate, but the volume error and measurement analysis error of the tungsten-cobalt composite solution make it difficult for us to accurately analyze the tungsten content and cobalt content of the composite solution

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