Superfine emulsified wax molding agent suitable for cemented carbide water-based mixture and preparation method

Abstract

The invention discloses a superfine emulsifying wax forming agent suitable for a hard alloy water-based mixture and a preparing method of the superfine emulsifying wax forming agent. The superfine emulsifying wax forming agent comprises, by weight, 45-55% of deionized water, 36-48% of paraffin, 6.5-8.5% of emulgator and 0.1-1% of emulsion stabilizer. The preparing method for the superfine emulsifying wax forming agent comprises the steps that the weighed paraffin, emulgator and emulsion stabilizer are placed in a beaker to be heated till the weighed paraffin, emulgator and emulsion stabilizer are melted into liquid, the paraffin mixing liquid is stirred, in the stirring process, the heated deionized water is slowly poured into the paraffin mixing liquid, and the superfine emulsifying wax forming agent is obtained after emulsification. The average particle size of the superfine emulsifying wax forming agent is smaller than one micron, the particle size distribution is concentrated, the superfine emulsifying wax forming agent can be directly added, stirred and mixed after slurry ball grinding is finished, and the defects that due to long-time ball grinding of emulsifying wax, emulsion breaking happens, thick and high scale paraffin is precipitated, and a large alloy hole is formed after sintering are overcome.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to an ultrafine emulsified wax forming agent suitable for cemented carbide water-based mixture and a preparation method thereof. Background technique [0002] At present, the production of traditional cemented carbide mixtures at home and abroad uses organic solvents such as alcohol, cyclohexane, and acetone as the wet grinding medium, and paraffin wax as the forming agent. This system has the disadvantages of environmental protection, safety, and high cost; When water is used as the wet grinding medium, the paraffin wax forming agent cannot be dispersed in water. This problem can be solved after emulsification of the paraffin wax. However, the existing emulsified wax formula and particle size are not suitable for the cemented carbide industry. The main reasons are: (1 ) The emulsifier in the emulsified wax formula contains elements that cannot be removed (such as Na, Cl, ...

AI Technical Summary

Problems solved by technology

[0002] At present, the production of traditional cemented carbide mixtures at home and abroad uses organic solvents such as alcohol, cyclohexane, and acetone as the wet grinding medium, and paraffin wax as the forming agent. This system has the disadvantages of environmental protection, safety, and high cost; When water is used as the wet grinding medium, the paraffin wax forming agent cannot be dispersed in water. This problem can be solved after emulsification of the paraffin wax. However, the existing emulsified wax formula and particle size are not suitable for the cemented carbide industry. The main reasons are: (1 ) The emulsifier in the emulsified wax formula contains elements that cannot be removed (such as Na, Cl, etc.), which will easily affect the properties of the alloy after sintering; (2) The emulsified wax contains acidic surfactants, and the acidic aqueous solution will make the mixture The oxidation of Co powder is aggravated during the ball milling process; (3) The emulsifier in the emulsified wax accounts for a relatively high proportion of paraffin wax, adding too much emulsifier affects the compacting performance and increases the difficulty of completely removing the molding agent; (4) the current The particle size distribution of the emulsified wax is wide and the average particle size is large. If there are particles larger than 10um in the emulsified wax, it is easy to form large alloy holes after sintering, which will affect the properties of the alloy.

[0003] The particle size of the emulsified wax used to prepare the water-based cemented carbide mixture is relatively coarse, and it needs to be added during the ball milling process. Although ball milling for a long time can further refine the particle size of the emulsified wax, it is easy to cause the emulsified wax to break. Alloy pores are likely to be caused by the emulsified wax particle being too coarse

Images