Inorganic polymer water-soluble quenching medium and preparation method thereof

Abstract

The invention discloses an inorganic polymer water-soluble quenching medium which has reasonable cooling characteristic distribution and stable performance, is safe and environmentally friendly and has lower cost, and a preparation method thereof. The quenching medium is an aqueous solution formed by mixing polyaluminium chloride, sodium hydroxide, zinc chloride, potassium chloride and water, wherein the concentration of the aqueous solution is 8-35 Baume and the aqueous solution comprises the following raw materials by weight percent: 59-62% of the polyaluminium chloride, 19-21% of the 10% sodium hydroxide, 14-16% of zinc chloride, 11-13% of the potassium chloride and the balance water. The preparation method comprises the following steps in sequence: adding the polyaluminium chloride and water in a container, and stirring until the polyaluminium chloride is fully dissolved; adding the 10% sodium hydroxide solution in the container, and stirring evenly; dissolving the zinc chloride in water, then adding the zinc chloride solution in the container, and stirring evenly; dissolving the potassium chloride in water, then adding the potassium chloride solution in the container, and stirring evenly; and adding water to ensure that the concentration of the solution in the container is 8-35 Baume.

Description

technical field [0001] The invention relates to a quenching medium, especially an inorganic polymer water-soluble quenching medium suitable for quenching bearing steels such as GCr15, GCr15SiMn and 42CrMo, which has reasonable distribution of cooling characteristics, stable performance, safety and environmental protection, and can reduce costs, and a preparation method thereof . Background technique [0002] In the past, in order to improve the surface hardness of the workpiece, the bearing industry mostly used quenching oil with petroleum as the main raw material, and there were the following problems: [0003] 1. The cooling rate in the high temperature zone is slow, and the GCr15 workpieces with a diameter below Φ40mm can still meet the quality requirements. [0004] However, for workpieces with a diameter of Φ40mm or more, there will be a phenomenon that the hardening is not hardened or the hardened layer is shallow; [0005] 2. During use, the oil fume is large and ...

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Problems solved by technology

[0004] However, for workpieces with a diameter of Φ40mm or more, there will be a phenomenon that the hardening is not hardened or the hardened layer is shallow;

[0005] 2. During use, the oil fume is large and the air pollution is serious, which not only directly endangers the physical and mental health of the operator, but also is very prone to fire because the oil fume is a flammable gas;

[0006] 3. The production cost is high and the use consumption is large, especially the workpiece is required to have a high quenching temperature, the heating time of the workpiece is long, and the power consumption is large, which increases the heat treatment cost of the workpiece

[0007] In order to solve the problems of quenching oil, there are currently a few water-based quenching media. Although it is environmentally friendly and eliminates the potential safety hazard of fire, its performance is unstable, the medium’s service temperature range is narrow (20~50°C), and it is easy to deteriorate. , The service life is short, and the quenched workpiece is prone to cracks and other phenomena, making it difficult to popularize and apply it in special industries such as bearings

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