A kind of forming agent for cemented carbide production

Abstract

The invention discloses a new forming agent for producing hard alloy. The forming agent is composed of, by weight, 30%-70% of stearic acid and 70%-30% of polyurethane resin; the forming agent, according to a certain ratio, is subjected to ball milling and mixing with hard alloy powder raw materials and an alcohol wet grinding medium so as to obtain uniform hard alloy mixture slurry; then hard alloy mixture containing the forming agent and with good fluidity is obtained through a spraying drying process; and then pressing and molding and sintering are carried out on the mixture to obtain a hard alloy product. The forming agent is simple in component and good in forming performance, can be completely dissolved in alcohol, is suitable for the spraying drying process, low in residual carbon content, safe and environment-friendly, and is a novel forming agent suitable for large-scale production of the hard alloy.

Description

technical field [0001] The invention relates to a molding agent for powder metallurgy production, especially a molding agent suitable for hard alloy production. Background technique [0002] In the cemented carbide production process, in order to make the powder pressed into products of various shapes, a certain amount of forming agent must be added to the cemented carbide mixture to improve the compression forming performance of the mixture and increase the hardness of the cemented carbide green body. strength. At present, the forming agents used in the cemented carbide industry are mainly divided into three categories. The first type is polyethylene glycol (PEG) type, the second type is paraffin type, and the third type is rubber type, such as butadiene rubber, butadiene rubber and styrene-butadiene rubber. These three types of molding agents have their own characteristics. The advantage of PEG is that it has low residual carbon content and is miscible with alcohol. It i...

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Problems solved by technology

For example, "a cemented carbide molding wax" (notification number CN103897408B) uses paraffin wax, stearyl alcohol and beeswax as raw materials. Compared with paraffin wax, its molding performance is improved, but it is still not suitable for spray drying process, and its composition is complex

For example, "a cemented carbide forming agent and its production and preparation method" (notification number CN102925726B) uses solvent oil, ethyl acetate, thermoplastic elastomer, rosin, dibutyl phthalate and naphthenic extender oil as raw materials, There are as many as 6 kinds of ingredients, and ethyl acetate and gasoline have safety and environmental protection risks, so they are not suitable for spray drying process

Another example is "Cemented Carbide Composite Molding Agent and Its Production Method and Its Application Method" (Notice No. CN101108954B), which uses paraffin, SBS solution and gasoline as raw materials. Gasoline has potential safety hazards and is also not suitable for spray drying process.

There is also "a molding agent for cemented carbide production" (notification number CN101372557B) which uses polyoxyethylene stearate, dioctyl phthalate and hydrogenated rosin as molding agent raw materials, which is not easy to control, and Polyoxyethylene stearate is harmful to the environment

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