Water-soluble phosphate lubricating glass and preparation method thereof

Abstract

The invention relates to water-soluble phosphate lubricating glass and a preparation method thereof. The glass comprises the following raw materials in percentage by mole: 50 to 75 percent of P2O5, 5 to 30 percent of K2O, 5 to 30 percent of Na2O, 0.1 to 10 percent of B2O3, 0.1 to 5 percent of ZnO and 0.1 to 5 percent of Al2O3. The preparation method comprises the steps of weighing, mixing, smelting, casting, ball milling and packing. The preparation method has the advantages of reducing an extrusion force, prolonging the service life of a die, improving the quality of a product and improving the workshop environment; and the product has surface finish, is smooth, has no scratch and has the characteristics of good stability.

Description

【Technical field】 [0001] The invention relates to the field of glass material, in particular to a water-soluble phosphate lubricating glass and a preparation method thereof. 【Background technique】 [0002] A glass that acts as a lubricant and also prevents oxidation of the metal when heated, and whose chemical composition is such that it is inert when in contact with the hot metal. A sufficiently strong plastic glass film can be formed on the metal surface at a given temperature and use time. Therefore, the basis for selecting the composition of the glass lubricant is: (1) The viscosity of the glass melt should change slightly with temperature, which can expand the temperature range of the extrusion operation and help improve the lubrication performance; (2) Good chemical stability , does not react chemically with metals such as steel to prevent the reduction of lubricating performance and metal strength, and can prevent decomposition and deterioration during storage and us...

AI Technical Summary

Problems solved by technology

[0005] The water-soluble lubricating glass used in the past has the disadvantage of poor stability. After the water-soluble glass is dissolved in water, it will crystallize and turn into salt after a few hours or a few days. Inconvenient to apply

[0006] Special Publication No. 7-112935 proposes an improved phosphate system glass lubricant, the mass percentage of which is composed of P 2 o 5 20-70%, B 2 o 3 0~60%, R 2 O is 8-50%, ammonia or amine > 0.5%, which is characterized by first melting ammonia-free phosphate glass according to conventional methods, and then dissolving it in an aqueous solution containing ammonia or amine. The amine used includes primary Amines, secondary and tertiary amines, but the chemical stability of this glass lubricant is insufficient

[0007] Japanese Institute of Industrial Technology No. 58-49504 proposes water-soluble phosphate lubricated glass for forging brass workpieces. The glass is dissolved in water to make a 20% mass percent aqueous solution, which is applied to the mold at 700-800 °C. Evaporation, the glass forms a film, the viscosity is about tens of Pa.s to hundreds of Pa.s, and it acts as a lubricant and a release agent at the same time. It can be used for rough processing and finishing. This type of glass is also suitable for extrusion Lubricating the extrusion chamber and extrusion die during the process, but its lack of chemical stability affects its application

[0008] Japan's cooperative oil (strain) special fair 7-41781 proposes a kind of lubricating grease containing phosphate glass powder, and the composition range molecular percentage of its glass is P 2 o 5 45-75%, M 2 O is 10-35% (M is alkali metal), B 2 o 3 It is 0~45%. It is characterized by white or off-white appearance, no pollution to the working environment, and low price. Compared with the existing lubricating grease, it has excellent load resistance, but its lack of chemical stability affects other greases. application

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