High temperature salt bath eutecticum and boronizing treatment method capable of increasing surface lifetime of mould

Abstract

The invention discloses a high temperature salt bath eutecticum and boronizing treatment method capable of increasing the surface lifetime of a mould. The treatment method comprises the following steps of: degreasing and derusting the surface of a mould base material, polishing and cleaning, drying for later use; mixing B4C in sodium silicate evenly, coating the mixture on the surface of the mould base material to form a B4C permeating agent layer, and drying the coated mould base material for later use; then mixing Al2O3 in sodium silicate, coating the mixture on the permeating agent layer of the mould base material to form an Al2O3 protective layer, and drying; and heating a salt bath container to the eutecticum temperature (1150-1250 DEG C), keeping the temperature for 10-30 minutes, discharging to perform air cooling or water quenching and obtaining a boronizing layer structure with the thickness of 800mu m. Therefore, the wear resistance of the mould material can be increased. The technical method has following advantages that: the surface heating (salt bath heating) uniformity of the mould material is good, the boronizing time is greatly shortened, the thickness of the boronizing layer is large, the surface quality is high, the brittleness of the boronizing layer is improved on the premise of ensuring the hardness and the wear resistance, etc.

Description

technical field [0001] The invention belongs to the technical field of surface heat treatment of metal materials, and in particular relates to a high-temperature salt bath eutectic boronizing treatment method for improving the surface life of a mold. Background technique [0002] The rapid development of the construction industry has put forward higher requirements for brick machine moulds, especially the brick making process of industrial waste mainly made of hard particles, and the service conditions of brick machine molds are extremely harsh. Under the working condition of the brick machine mold, the stones and sand grains used as raw materials for production are strongly scraped, and the working surface is subjected to the repeated action of periodic pressure and friction of the blank, and some are also eroded by the blank, so wear and tear will occur. Surface damage such as fatigue and corrosion, therefore, the surface of the metal material used for the mold must have g...

AI Technical Summary

Problems solved by technology

[0004] The traditional boronizing process forms a hard and brittle FeB and Fe layer on the steel surface. 2 B. The crystal structure, specific volume and thermal expansion coefficient between the intermetallic compound and the matrix are all different, so that there is a huge internal stress in the boronizing layer, and peeling occurs during quenching and use.

In addition, traditional boronizing and carburizing-borizing takes a long time, requiring 7h to 20h, and the obtained boronizing layer is thin in thickness, ranging from 50μm to 200μm, with low wear resistance, which seriously affects the service life and infiltration of workpieces such as brick machine molds. Application of boron technology

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