Production of carbon nanotube reinforced Fe-based amorphous alloy thermal spray coating and method

Abstract

The invention provides the production of a carbon nanotube reinforced high tenacity Fe-based amorphous alloy thermal spray coating and a method. A mechanical ball-milling method or a spray granulation method is utilized to reconstruct Fe-based amorphous powder and a carbon nanotube to form Fe-based amorphous-carbon nanotube composite powder; a spraying material surface is pretreated; and the thermal spraying process is carried out, a plasma spraying technology is adopted to spray the Fe-based amorphous-carbon nanotube composite powder, so the high strength and tenacity Fe-based amorphous coating is produced. The Fe-based amorphous alloy powder comprises components of C, B, Ni, Si, Mo, Cr, W and Fe; and the granularity is 1-100mum. The carbon nanotube is a multi-wall carbon nanotube which has the purity larger than 95%, the external diameter of 8-70nm and the length of 100nm-20mum. The carbon nanotube and the Fe-based amorphous are well combined in the coating, so the reinforcing effect is obvious; and the coating fracture surface presents an appearance of total brittle fracture and local ductile fracture, both the tenacity and strength of the Fe-based amorphous are improved, so a practicable and feasible method for applying the Fe-based amorphous coating in a project is provided.

Description

technical field [0001] The invention provides a carbon nanotube-reinforced high-toughness iron-based amorphous alloy thermal spray coating and a method thereof, which are suitable for various materials whose surfaces require high strength and high toughness. Background technique [0002] In 1991, Sumio Iijima of Japan observed for the first time hollow carbon fibers with an electron microscope. The diameter is generally between a few nanometers and tens of nanometers, and the length is several micrometers or even millimeters. They are called "carbon nanotubes". Carbon nanotubes have extremely high strength and excellent toughness. Its strength is about 100 times that of steel, but its density is only 1 / 6 that of steel. Theoretical and experimental research results show that the Young's modulus of single-walled carbon nanotubes can reach 1TPa, which is comparable to that of diamond. [0003] Due to the excellent mechanical properties of carbon nanotubes, as an ideal fiber r...

AI Technical Summary

Problems solved by technology

However, like other amorphous alloys, in traditional macroscopic mechanical property tests, iron-based amorphous alloys tend to undergo non-uniform deformation, and the plastic deformation is concentrated in a small number of shear bands, showing macroscopic brittleness.

This feature of iron-based amorphous alloys largely limits its application in the field of engineering

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