Oxidation resistant coating for hot stamping parts of ultrahigh strength sheet steel at high-temperature

Abstract

The invention relates to an oxidation resistant coating for hot stamping parts of ultrahigh strength sheet steel at high-temperature, comprising the following main components: boron modified organic silicon resin, polymethylsiloxane resin, tetraborate nitride powder, ionic liquid, aluminum powder, and polydimethylsiloxane. The coating has the advantages that the ionic liquid is used as organic solvent, therefore, the volatility is low and the thermal stability is high, in addition, solid lubricant is added, which can effectively prevent sheet materials from being oxidized, improves the frictional behaviour and the shaping property of the sheet materials; the thermal conduction of the coating is improved by adding metal particles, thus being beneficial to quenching. The coating can be directly applied to direct hot stamping forming process and indirect hot stamping forming process.

Description

Technical field: [0001] The invention relates to a high-temperature anti-oxidation coating for hot stamping parts of ultra-high-strength steel plates, which belongs to the technical field of coatings and the technical field of hot stamping forming. Background technique: [0002] Due to the great advantages of the high-strength steel parts it produces in improving automobile safety performance and energy saving and emission reduction, hot stamping technology is currently receiving extensive attention in the automobile industry. The main process principle is to heat the boron alloy steel plate to 880°C-950°C in a heating furnace with a gas protection atmosphere, so that the plate is completely austenitized, and then quickly transfer it to the hot stamping mold by a robot. The medium plate is rapidly formed, and at the same time rapidly cooled and quenched to obtain parts with a high-strength martensitic structure. [0003] Oxidation of high-temperature plates is a problem tha...

AI Technical Summary

Problems solved by technology

At present, several high-temperature oxidation-resistant coatings have been developed in China, but due to their own characteristics, they are not suitable for hot stamping forming process

In Chinese patent (03137948) a high temperature resistant anti-wear lubricating coating is disclosed, but its upper temperature limit cannot reach the 880-950 °C required by hot stamping forming. Another Chinese patent (200710023510) proposes a high temperature resistant steel surface Oxidized scale coating, the working temperature can reach 800°C-1800°C, but this kind of coating uses isopropanol as organic solvent and fatty alcohol sulfonate as additive, the friction performance is not good, and it cannot meet the requirements of sheet formability