Composite processing technology for nanometer coating of hot work mold

Abstract

The invention discloses a composite processing technology for a nanometer coating of a hot work mold. The composite processing technology comprises the following steps of (1) ultrasonically cleaning the surface of the mold by using acetone, and washing the surface of the mold with deionized water after finishing; (2) soaking the surface of the mold with an acetic acid solution, and washing with deionized water after the surface of the mold is completely soaked; (3) uniformly spraying a silane coupling agent on the surface of the mold, standing for a certain time, repeatedly washing with deionized water, placing into a drying box for heat preservation for a certain time, wherein the temperature of the drying box is 110-130 DEG C to obtain a mold subjected to silane treatment; and (4) immersing the silane-treated mold in the graphene suspension to keep a certain temperature, the heating time is 1-5 hours, washing with deionized water after taking out, blow-drying by using nitrogen, and forming a graphene film on the surface of the mold. According to the composite processing technology, the size of the graphene composed of the thin film is in the nano-order size, graphene has the characteristics of being high in strength, good in heat conduction performance, high in stability, excellent in friction reduction and wear resistance and the like.

Description

technical field [0001] The invention relates to the technical field of mold surface treatment, in particular to a nano-coating composite processing technology for hot-working molds. Background technique [0002] At present, molds mainly include: cold working molds, plastic molds and hot working molds. In contrast, the working conditions of hot working dies are harsher, because they need to be in direct contact with liquid metal or heated blanks, and are constantly heated and cooled, while also bearing impact loads. Therefore, hot working dies The performance requirements for hot work die steel are higher. However, in the repeated cold and heat fatigue and high temperature wear of hot work die steel, the hot work die steel will collapse due to insufficient strength in some areas of the hot work die steel. This is also a technical problem that has been difficult to solve for many years. It is a way out to develop a new type of hot work die steel material. The performance of...

AI Technical Summary

Problems solved by technology

However, with the advancement of science and technology and the improvement of people's awareness of environmental protection, nitriding technology has exposed more and more disadvantages: first, nitriding treatment needs to heat the mold to 470-550 ° C, however, above 550 ° C to promote The phase transformation of die steel will cause quenching phenomenon, which will change the mechanical properties of the steel body, thereby reducing the service life of the die; secondly, the nitriding technology has restrictions on the technical level of the operator; thirdly, the nitriding process has a long treatment cycle and usually requires 18 to 22 hours; fourth, nitriding technology can only meet the wear resistance and fatigue resistance requirements of light and medium loads; fifth, nitriding treatment causes serious environmental pollution, and the working environment is poor, which is harmful to the health of the staff Big