Preparation method for cemented carbide mixture

Abstract

A preparation method for producing cemented carbide mixture is disclosed, the raw materials of which comprises WC powder, WC-TiC solid solution and Co powder; adopting paraffin as forming agent, absolute alcohol as the medium of rubbing and adding oleic acid and stearic acid into the rubbing medium as dispersing agent. The technical process comprises the following steps: accurate batching, loading the heated molten and filtered paraffin into a ball mill for pre-rubbing; wet milling, putting the prepared material into the ball mill, adding right amount alcohol as the ball milling medium, simultaneously, adding dispersing agent, and then turning on the machine for wet milling; slurries filterring, unloading the slurries and filtering for 200-320 meshes; spray drying and pelletizing, spray drying and pelletizing the slurries by using spray drying equipment; and sieving, producing mixture material grain suitable for various kinds of pressing requirements. The method has the advantages of short production process flow, reliable and stable product quality and high production efficiency, which is suitable for large scale production operation and can be widely used for preparing cemented carbide mixture.

Description

technical field [0001] The invention relates to a method for preparing a cemented carbide mixture, in particular to a method for preparing a cemented carbide mixture using alcohol paraffin. Background technique [0002] Cemented carbide is widely used due to its high strength and high hardness characteristics. The key to the preparation of cemented carbide is the preparation of the mixture. [0003] Now the preparation method of the mixture mainly adopts rubber technology, alcohol PEG technology, hexane paraffin technology and so on. Since paraffin wax is the most pure molding agent substance, it will not "age", has a low evaporation temperature, is easily excluded in the low-temperature sintering stage, has no ash, and will not bring impurities into the alloy. Therefore, it is used for the molding of cemented carbide agents have been widely recognized. [0004] In the prior art, paraffin wax is often used as a molding agent, and alcohol is also used as a wet grinding med...

AI Technical Summary

Problems solved by technology

The disadvantages of this process method are: the process is long, the process is many and complicated, especially, the product quality is greatly affected by the individual factors of the operator, and it is difficult to ensure the stability of product quality

[0005] Although some manufacturers use paraffin as a molding agent and use spray drying equipment to prepare the mixture, which greatly shortens the process of preparation of the mixture and improves the stability of the product quality of the mixture, but due to the use of wet grinding The medium is hexane, and the flash point of hexane is very low, only -47.8°C, which brings serious problems to production safety.