High intensity abrasion resistant arc spraying filament material for circulating fluidized bed boiler

Abstract

The invention discloses a high intensity abrasion resistant arc spraying filament material for circulating fluidized bed boiler, wherein low-carbon steel or stainless steel band is used as the shell of the material, the core is added by 25-48 wt% of mixture powder of CrB2 and B4C, the content of CrB2 in the mixture is 70-95 wt%. The core comprises 0-5 wt% of powder of any one selected from Ni and / or Al and / or Mo and / or rare-earth element.

Description

technical field [0001] The invention relates to an electric arc spraying wire for a circulating fluidized bed boiler, in particular to a high-strength wear-resistant arc spraying wire for a circulating fluidized bed boiler. Background technique [0002] Circulating fluidized bed boilers are favored because of their three characteristics: cleanliness, high efficiency and wide adaptability to coal combustion. However, due to the medium-temperature cycle combustion and burning of a large amount of inferior coal, the heating surface has extremely serious erosion wear, abrasive wear and eddy current wear, and the wear degree is much more serious than that of ordinary pulverized coal furnaces. The local heating surface of most circulating fluidized bed boilers will wear and burst within 1-3 months of operation. Some circulating fluidized bed boilers have a shorter life of wear and explosion on the heating surface of the circulating fluidized bed boiler and can safely operate for m...

AI Technical Summary

Problems solved by technology

However, the current arc sprayed wire materials on the market are difficult to meet the anti-wear requirements of the heating surface of the circulating fluidized bed boiler, the overall coating is not good, and the service life is extremely short

Some coatings made of wire are hard and brittle, and the hard phase and adhesive phase have poor compatibility, and are easily washed off. Some coatings made of wire have good toughness, but are too soft and not wear-resistant. The wire material is difficult to meet the requirements of the arc spraying process, the melting is not good, the arc is easy to break and the coating is uneven, uneven, etc.