High-temperature-resistant abrasion-resistant remelting nickel-based composite coating for fire grate segment of garbage incinerator and preparation of high-temperature-resistant abrasion-resistant remelting nickel-based composite coating

Abstract

The invention relates to a high-temperature-resistant abrasion-resistant remelting nickel-based composite coating for a fire grate segment of a garbage incinerator. The high-temperature-resistant abrasion-resistant remelting nickel-based composite coating is a remelting nickel-based self-fluxing alloy-based aluminum oxide particle reinforced composite coating. The coating is cladded on the surfaceof the fire grate segment and is metallurgically bonded with the surface of a fire grate segment base body. The invention also relates to the preparation method of the coating. The method comprises the following steps: firstly, pressing and coating high-heat-release nano thermite on the surface of the fire grate segment, then spraying a nickel-based self-fluxing alloy material, preparing the nickel-based self-fluxing alloy-based composite coating on the surface of the fire grate segment through a self-propagating reaction caused by spraying, enabling a spraying coating to be in metallurgicalbonding with a thermite reaction product and the base body, finally, remelting a self-fluxing alloy layer sprayed on the surface through an induction coil or oxyacetylene flames, and obtaining the compact abrasion-resistant coating. The coating prepared through the method is compact in structure, smooth in surface, high in interface bonding strength with the base body, good in high-temperature abrasion resistance, suitable for curved surface automatic surfacing and capable of achieving industrial batch production.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, and relates to a high-temperature-resistant and anti-abrasion remelted nickel-based composite material coating for grate plates of garbage incinerators and a preparation method thereof. Background technique [0002] The grate of the waste incineration power plant transports burning waste under the conditions of high temperature, corrosive gas and friction and wear in the incinerator, and the surface in contact with the waste is severely abrasive. The domestic waste incinerator grate has a short service life (7-10 months), which affects the long-term stable use of the incinerator. It is urgent to improve the manufacturing process and extend the service period. [0003] In the prior art, the corrosion-resistant coating with excellent surface quality can be obtained by thermal spraying nickel-based alloy and then remelting process, but the coating and the substrate are only micro-metallu...

AI Technical Summary

Problems solved by technology

The service life of the domestic waste incinerator grate is short (7-10 months), which affects the long-term stable use of the incinerator. It is urgent to improve the manufacturing process and extend the service period

[0003] In the prior art, the corrosion-resistant coating with excellent surface quality can be obtained by thermal spraying nickel-based alloy and then remelting process, but the coating and the substrate are only micro-metallurgically bonded, not complete metallurgically bonded, and the bonding strength is not high. When the coating is easy to fall off, it is urgent to develop a preparation technology for the high-temperature-resistant and anti-abrasion coating that has high bonding strength and is not easy to fall off.