Manufacturing method for functionally gradient material capable of reinforcing tuyere

Abstract

The invention relates to a manufacturing method for a functionally gradient material capable of reinforcing a tuyere. The manufacturing method comprises the following steps: firstly, cleaning oil stain and dust on the inner wall and the small end of the copper matrix tuyere, and pre-heating to about 500 DEG C; overlaying a Ni202 transition layer on the copper matrix tuyere; overlaying a CoGrW reinforcing layer on the transition layer; performing sandblast texturing treatment on the reinforcing layer for enabling the surface to be flat, wherein the whole overlaying layer is 3 mm in thickness; plasma-spraying a ZrO2 thermal barrier coating with the thickness of 0.5 mm after the CoGrW reinforcing layer is preheated, in order to prevent the phenomenon that cracks exist in the CoGrW reinforcing layer during the use due to the different heat conductivity coefficient. According to the invention, the transition layer and the reinforcing layer are overlaid, the thermal barrier coating is plasma-sprayed, and the overlaying layer can reach the thickness and metallurgical bonding strength required for use, so that falling can be prevented during the use, the copper matrix tuyere can be protected by the thermal barrier coating during use, the cracking or falling of the reinforcing layer caused by thermal stress is reduced, the hardness is high, the abrasion resistance is excellent, the cost is low, the production efficiency is high, and the service life can reach 10 months.

Description

technical field [0001] The invention relates to the technical field of low-alloy high-strength steel plate production, and mainly relates to a method for manufacturing a novel functionally graded material for blast furnace tuyere strengthening. Background technique [0002] The tuyere is a key spare part in the blast furnace smelting pig iron production. The working environment of the blast furnace tuyere is severe. It is located in the high-temperature furnace hearth above 2000 °C and bears the radiation and convective heat shock in the high temperature area. The front end of the tuyere is subjected to liquid slag iron and Scoured by hot materials in high-speed circulation, hot air at 900°C-1300°C passes through the tuyere, and at the same time, it is subjected to strong oxidation and infiltration of trace elements in the tuyere in the combustion cycle area. The high-speed wear of the powder, these unfavorable factors have aggravated the damage of the tuyere. [0003] The ...

AI Technical Summary

Problems solved by technology

However, due to the large input heat of fusion welding, the accumulation of heat during multi-layer surfacing makes the tuyere easy to deform, and the size of the tuyere is small, which makes it inconvenient to form, and the thermal conductivity of the surfacing layer is not good, and it is easy to crack and peel off. bad, low lifespan

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