Method for preparing titanium diboride and titanium carbide enhanced iron-based wear resistant composite paint

Abstract

The invention relates to a method for preparing a titanium diboride and titanium carbide enhanced iron-based wear resistant composite paint. The method comprises the following steps: selecting a plurality of materials from iron powder, titanium powder, ferrotitanium powder, boron carbide powder, ferroboron powder and graphite powder to mix and form mixed powder containing the four elements of iron, titanium, boron and carbon, adding or not adding one or more of Ni, Cr, Si and Y2O3, placing the obtained powder in a ball mill or mixer to mix evenly; then using the mixed metal powder to form paste, coating the paste on the surface of carbon steel to form a layer of preset powder; and then adopting laser heating to irradiate the preset powder and ensure that the preset powder and partial carbon steel base material are molten to form a molten bath and perform metallurgical reaction. The preparation method is simple and the prepared composite paint has high hardness and excellent wear resistance.

Description

technical field [0001] The invention relates to a preparation method of a coating material. Background technique [0002] Titanium diboride and titanium carbide ceramics have high strength, high hardness, high elastic modulus (titanium diboride 29.4GPa, titanium carbide 28GPa), and good chemical stability, and are often used as reinforcements in wear-resistant composite materials Mutually. The preparation of titanium diboride and titanium carbide reinforced iron-based composite coatings can not only give full play to the characteristics of high wear resistance of the reinforcing phase, but also have high toughness and good crack resistance. At the same time, the composition of the iron-based alloy is close to that of the repaired steel-based component, the interface is firmly bonded, and the cost is low. [0003] The usual methods of preparing titanium diboride and titanium carbide reinforced coatings are thermal spraying, induction cladding, surface melting and casting, e...

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Problems solved by technology

[0003] The usual methods of preparing titanium diboride and titanium carbide reinforced coatings are thermal spraying, induction cladding, surface melting and casting, etc., but these methods often have the disadvantages of low coating bonding strength, non-dense coating, and difficult control of thickness.

For example, Shipway et al. prepared TiB by supersonic flame spraying. 2 , TiC joint strengthening coating, but the coating thickness is thin and the density is low

[0004] Patent CN101037771A discloses "a preparation of TiC-TiB 2 Nano-micro composite ceramic coating method", which prepared TiC-TiB by laser cladding ceramic powder precursor 2 Ceramic coating, but this preparation method requires plasma granulation and densification of the precursor powder, and needs to spray a Ni-based alloy primer, so the process is more complicated

Patent CN1962942A discloses "a method for in-situ generation of TiC / metal composite cladding layer controlled by plasma", which uses plasma arc cladding of ferrotitanium and graphite powder to prepare a TiC reinforced metal coating, but due to the large heating area of ​​the plasma arc, The processing accuracy of the coating is not easy to control, and when the content of TiC in the coating is high, it is easy to cause the accumulation and growth of single-phase ceramics, which reduces the plasticity and toughness of the coating