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IF Furnace for Sintering Molybdenum

Molybdenum and molybdenum alloy products have been popular in electronics, vacuum, coating, aerospace, oil, chemicals, high temperature furnace parts, and heating elements. Powder metallurgy is the method for producing molybdenum and its alloys. Sintering is one of the manufacturing processes, which is mostly used intermediate frequency furnace (IF furnace). The size of furnace is also being larger for meeting the requirement of large size molybdenum rod and bar sintering, such as type 650 and type 850 can sinter Ø90mm rod with net weight of 50kgs. However, even though these two types can both be sintering furnace for Ø90mm rod, the quality produced by different furnace will be different.

Smaller IF (Intermediate Frequency) furnace, stable quality of molybdenum and its alloys. On the contrast, Large IF furnace will lead to fluctuate in quality for moly parts. In order to get good qualified moly parts, the choosing of suitable sintering furnace is significant.

During sintering in large size IF furnace, oxygen content is much difficult to be controlled. Hydrogen is the main factor to control the oxygen content. Inserting amount of hydrogen has been not so easy controllable in large furnace.

Moly parts are also different from lanthanum moly. In large IF furnace, the section of sintering lanthanum moly parts is easier to get a uneven crystal structure. In order to improve the quality, there are three methods - decrease the temperature increasing speed, longer keeping temperature time, and increase hydrogen flowing amount.

Therefore, based on the above methods, choosing suitable furnace is the first step to assure the sintering quality of moly rod and its alloys, including lanthanum moly, which is designed for high temperature parts. Meanwhile, the flowing rate and amount of hydrogen can help improve sintering molybdenum quality, which can protect sintering molybdenum and reduce the oxidized surface of moly parts.

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