Preparation method of hot die-casting die surface coating

Abstract

The invention relates to a preparation method of a hot die-casting die surface coating. The preparation method of the hot die-casting die surface coating comprises the following steps: blasting sand on the surface of a hot die-casting die, washing the surface of the hot die-casting die, then putting the hot die-casting die into an electric arc ion plating device, taking a rectangular Ti target as a Ti source of a bottom layer, mounting the rectangular Ti target on the left inner wall of a furnace body, controlling the evaporation rate of the rectangular Ti target through current of a rectangular Ti target electric arc power supply and preparing a Ti bottom layer on the surface of the hot die-casting die; then taking a circular CrAl target as Cr and Al element sources for preparing a CrAlN coating, wherein the atomic component ratio of the Cr to Al is expressed as Cr/Al and is 70 to 30, and controlling the evaporation rate of the CrAl target through current of a circular CrAl target electric arc power supply; taking high-purity N2 as reaction gas, ionizing the N2 and combining N2 with Cr and Al elements, and depositing N2 and the Cr and Al elements on the Ti bottom layer to form the CrAlN coating. The oxidation resistance temperature of the prepared CrAlN coating reaches 1100 DEG C; the hardness of the CrAlN coating reaches Hv3000; the requirements of abrasion resistance, fatigue resistance and oxidation resistance of the hot die-casting die can be well met; the CrAlN coating is suitable for strengthening the surface of the hot die-casting die under severe service conditions such as high temperature, high speed and heavy load and the like.

Description

technical field [0001] The invention belongs to the technical field of preparing hard coatings by vacuum vapor deposition, and in particular relates to a method for preparing surface coatings of hot die casting molds. Background technique [0002] Hot die casting technology refers to the casting method of filling the mold cavity with molten alloy under high pressure and high speed conditions, and cooling and forming under high pressure. It is one of the most widely used and fastest developing metal thermal forming process methods in casting technology . As an advanced non-ferrous alloy precision parts forming technology, hot die casting adapts to the requirements of product complexity, precision, light weight, energy saving and greening in modern manufacturing industry, and its application fields are constantly expanding. With the continuous improvement of die-casting equipment and process technology, the application range of die-casting products will continue to expand on ...

AI Technical Summary

Problems solved by technology

However, the application of hard coatings in the field of molds is still in its infancy, especially for the high-performance coating strengthening technology on the surface of hot die casting molds.

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