Nano silicon carbide whisker reinforced temperature-resistant and wear-resistant nozzle and manufacturing method thereof

Abstract

The invention discloses a manufacturing method of a nano silicon carbide whisker reinforced temperature-resistant and wear-resistant nozzle. The method comprises the following steps: premixing matrix powder: putting nano SiCw whisker, tabular corundum fine powder, active alpha-Al2O3 micro powder, SiO2 micro powder, aluminate cement and an additive into a stirrer according to a set proportion, mixing, and sealing and storing the mixed matrix material for later use; mixing the SiC particles which are weighed according to the proportion with the pre-mixed matrix powder, dispersing and adding a proper amount of HCA high-temperature-resistant fibers, continuously stirring, finally adding water accounting for 5-8% of the total weight of the materials, mixing and stirring, injecting into a clean mold sprayed with silicone oil to form a film after stirring completely, fully and uniformly, carrying out vibration molding, standing for more than 48 hours after the surface is subjected to slurry flooding, demolding, drying in a heat treatment furnace with a temperature of 110 DEG C, baking for not less than 127 hours in the furnace according to a heating and heat preservation curve until the temperature is increased to a preset temperature, and then, slowly cooling to room temperature. According to the invention, the toughness and thermal shock resistance of the nozzle are effectively improved.

Description

technical field [0001] The invention relates to the technical field of combustion systems for coal-fired power generation, in particular to a method for manufacturing a nano-silicon carbide whisker-enhanced temperature-resistant and wear-resistant nozzle. Background technique [0002] The function of the boiler burner in the combustion system of coal-fired power generation is to send the fuel (powdered coal) and the air required for combustion into the furnace through the nozzle according to a certain ratio, speed and mixing method, so as to ensure rapid and sufficient combustion and good energy efficiency. To adapt to load changes and coal types during operation, reduce NOx generation, and meet the environmental protection requirements of ultra-low emissions; therefore, how to better achieve uniform mixing of fuel and air, complete combustion, and prevent fuel waste is very important. [0003] The traditional burner nozzle is made of heat-resistant cast steel, which is easy...

AI Technical Summary

Problems solved by technology

[0003] The traditional burner nozzle is made of heat-resistant cast steel, which is easy to wear and has low temperature resistance (below 1000°C), and it is easy to oxidize and corrode, deform and warp at high temperature, causing the nozzle size to deviate from the original design size, resulting in The flame range is shortened, the temperature rise is too high, slagging is easy to occur, and the burning loss of the nozzle is accelerated, resulting in a decrease in the working efficiency of the nozzle, affecting the normal operation of the equipment and shortening the service life

[0004] In view of the defects of the above-mentioned nozzles, the present invention overcomes the defects of ordinary silicon carbide, such as brittleness, easy fracture, high temperature and easy oxidation, through measures such as nano-silicon carbide whisker enhancement, and adopts the self-sintering energy-saving process in the furnace during use to prepare a nano-carbide Silicon whisker reinforced temperature-resistant and anti-wear nozzle, which has the characteristics of high temperature resistance, erosion resistance, high structural strength, good integrity, good thermal shock stability, long service life, and convenient molding, making it unique in this field. value

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