Preparation method of Fe2B intermetallic compound wear-resistant coating

Abstract

The invention discloses a preparation method of a Fe2B intermetallic compound wear-resistant coating. The preparation method of the Fe2B intermetallic compound wear-resistant coating comprises the steps of preparing Fe-B alloy and Fe mixed powder or Fe2B and B mixed powder as a raw material, wherein the raw material is prepared from the elements including, by mass,9 percent to 15 percent of B, andthe balance Fe; and adopting synchronous powder feeding laser cladding for preparing the coating. During the cladding process, a gradual layer-by-layer laser power decreasing process is adopted for avoiding energy accumulation caused by layer-by-layer cladding, so that the laser cladding coating structure is controlled to be Fe2B and Fe. According to the coating provided by the invention, the substrate surface friction and wear properties are improved, and the coating and a substrate have favorable metallurgical bonding; and meanwhile, a cladding material only contains Fe and B which are twoelements wide in source and low in price so as to have the potential in technological and economic benefits.

Description

Technical field [0001] The invention relates to a surface coating and a preparation method thereof, more specifically, to a Fe 2 B. Intermetallic compound wear-resistant coating and its preparation method. Background technique [0002] The high wear resistance of Fe-B alloy coating is mainly due to the boride (Fe 2 B+FeB) exists. With Fe 2 Compared with B phase, FeB phase has higher hardness, 2 Phase B is more brittle. Therefore, Fe 2 B is a more ideal reinforcing phase in Fe-B alloys. Fe 2 B is a typical intermetallic compound, which has the advantages of high hardness, good thermal stability, strong wear and corrosion resistance and relatively small brittleness. It only contains Fe and B, which are widely sourced and cheap elements, but With high chromium carbide Cr 7 C 3 Equivalent hardness, showing high cost performance, is a low-cost, high-performance wear-resistant material with great development potential. [0003] Boronizing is the most widely used technique for preparin...

AI Technical Summary

Problems solved by technology

In addition, due to the limitations of the boronizing process itself, at present, boronizing has encountered many unavoidable problems in actual production: (1) The high temperature of boronizing damages the properties of the substrate, which is easy to cause grain growth and workpiece deformation; ( 2) High energy consumption, a lot of waste, difficult to handle, pollute the environment, and cumbersome process; (3) Not suitable for effective boronizing treatment of large-sized workpieces or parts of workpieces; (4) Generally coarse tissue, preferred orientation , no equiaxed crystals; (6) The workpiece needs to be reheated after boronizing

Because these technologies all have the characteristics of powder presetting, they all have the following problems: (1) It is difficult to prepare coatings on parts with highly complex structures and their local areas, and it is not easy to realize automatic production; (2) It is difficult to ensure coating Uniform composition; (3) easy to form teardrop-shaped surface features; (4) obvious thermal effect on the base material, large dilution rate

However, in the multi-layer cladding process, if the laser cladding process is not properly controlled, as the number of layers increases, along with energy accumulation, the physical and chemical reactions of each layer of cladding process are different, and the coating structure is difficult to control , leading to significant differences in material properties

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