Production technology of iron base powder metallurgical fire cover

Abstract

The invention relates to a production process of an iron-based powder metallurgy fire cap, comprising the following steps: using <100 mesh atomized Fe powder and a composite lubricant to mix into a powder metallurgy raw material in a carbon source-free environment, wherein the <100 mesh The mass percentages of atomized Fe powder and composite lubricant are: <100 mesh atomized Fe powder 99.5%, composite lubricant 0.5%; the composite lubricant is compounded by lithium stearate, stearic acid and calcium oxalate The mass percentage of the three is: lithium stearate 50%, stearic acid 42%, calcium oxalate 8%; the powder metallurgy raw materials prepared in step 1 are mixed in a clean double-cone mixer at 19-21r / min Mix at a speed of 60 minutes to make a powder metallurgy mixture; press the powder metallurgy mixture obtained in step 2 into a fire cap compact; sinter the compact obtained in step 3 at 1120°C for 4 hours to obtain a powder metallurgy sintered compact; The powder metallurgy sintered compact obtained in step 4 is enamelled to obtain an iron-based powder metallurgy fire cap. The invention can successfully utilize the advantages of powder metallurgy to produce the fire blocking cover, and the comprehensive cost can be reduced by 40%.

Description

technical field [0001] The invention relates to a production process of a powder metallurgy fire lid. It belongs to the technical field of powder metallurgy new materials. Background technique [0002] With the continuous development of the economy and the continuous improvement of people's living standards, the consumption of coal stoves that use coal as direct fuel and cause serious pollution and low thermal efficiency is reduced, while the demand for gas stoves is increasing, and the annual demand exceeds 200,000,000 pieces. The fire blocking cover on the gas stove plays the role of separating the flame, concentrating heating to improve thermal efficiency, and reducing the temperature rise of the furnace. Aluminum casting + enamel or stamped iron plate + enamel process has been used in the past. However, because the aluminum casting process does not meet the national standard because its temperature resistance is lower than 700 ° C, it has not been used in the domestic ...

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Problems solved by technology

However, because the aluminum casting process does not meet the national standard because its temperature resistance is lower than 700 ° C, it has not been used in the domestic market, and the stamping iron plate process is limited to flat products, which cannot manufacture fire covers that require complex positioning, and the enamel adhesion is low

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