Tuyeres of blast furnace surface recombination coating and method for preparing the same

Abstract

The invention provides a composite surface coating for blast furnace tuyere and a preparation method thereof. The composite surface coating for blast furnace tuyere is composed of a bottom layer, a transition layer and a surface layer; wherein the bottom layer is made by Ni-based alloy material by plasma surfacing technique; the transition layer is made by NiCrAl alloy material by supersonic speed flame plating technique; the surface layer is made by mixture of ZrO2Y2O3 and Al2O3 by plasma spraying technique. As the composite surface coating is adopted for surface treatment of the blast furnace tuyere, the gradient change of linear expansibility between the coating and copper parent metal is realized; and the wearing resistance and thermal shock resistance of the blast furnace tuyere are ensured; pitting resistance is improved, the service life of the blast furnace tuyere is prolonged, the requirement of optimizing maintaining model of the blast furnace is met, stable and smooth production of the blast furnace is ensured, and equipment maintenance cost is greatly reduced.

Description

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AI Technical Summary

Benefits of technology

This patented technology helps prevent cracks on turbine components caused by high temperatures during operation or damage from heat generated when they operate under these extreme environments for longer periods of time without losing their effectiveness over an extended period of use.

Problems solved by technology

Technological Problem addressed in this patents relates to improving the durable performance (wear resistant) and corrosiveness properties of tantalum carbide/nickel based composites applied onto blasts during manufacture without causing damage or cracks over their own surfaces. Current solutions involve adding various layers of refractory oxides like chromium nitride, silicon dioxynitrides, zirconia, etc., but they may also lead to reduced toughness and increased brittleness compared to traditional techniques involving fusion casting. Additionally, there was no solution proposed previously where an intermediate barrier layer called ZrBaCuAl20 could prevent diffusion of molten iron salt particles towards underlying steel components when applying these types of plasma processes.

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