Vacuum Brazing Furnaces

These are electrically heated batch furnaces for standard and high-temperature brazing processes. The typical design temperature is 1,300 °C, but can reach 1,700 °C in some cases. For vacuum brazing applications, PVA offers two different product series that differ primarily in terms of the design of the heating element and the vacuum pump. PVA brazing furnaces for industrial production processes generally have active gas cooling units for rapidly cooling brazing batches to room temperature and therefore help to make processes extremely efficient.

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Vacuum - Heat Treatment and Sintering Furnaces COV

This type of furnace is used primarily for robust high-volume applications with steel or copper materials. The product series is characterized by a sturdy heating element consisting of graphite heating conductors and soft graphite felt insulation. The heating element boasts an impressive service life even when employed in tough process conditions. When more is required of the brazing process atmosphere, such as in the brazing of superalloys, special purified graphite materials are used for the heating element. COV brazing furnaces are generally offered in the form of fine-vacuum or high-vacuum furnaces.

With the high-vacuum design, this furnace type is usually fitted with an oil diffusion pump. For brazing processes that involve large quantities of brazing paste, PVA offers a patented active debinding furnace that enables even large amounts of binder to be removed from the furnace efficiently and without leaving any residue. The chief benefits of this debinding system are short debinding times coupled with the avoidance of extensive furnace contamination as a result of binder components condensing. Consequently, the debinding system offers customers better system availability owing to the fact that the furnace requires much less cleaning and maintenance than is the case with conventional machines.

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High Vacuum Brazing Furnaces - MOV

These are high-vacuum brazing systems with metal heating elements. This type of system is notable for its very high-quality hydrocarbon-free brazing process atmosphere and is therefore used primarily in special applications involving the use of reactive materials such as titanium, niobium or tantalum. MOV brazing systems usually take the form of high-vacuum systems and typically feature turbomolecular or cryogenic pumps. All-metal heating elements made of refractory metals are characteristic of brazing systems in the MOV series. Molybdenum or tungsten alloys are used as materials for the heating element depending on the design temperature of the system in question. In special cases, tantalum can also be used.

MOV brazing systems reach a final vacuum of up to 10-8 mbar and thereby satisfy even the most demanding requirements regarding brazing atmosphere quality, such as those applicable to the manufacture of vacuum interrupters. There is a range of rapid cooling designs available for MOV systems and these can be adapted to suit the relevant requirements concerning brazing process quality. For UHV-type MOV systems, there is special external rapid cooling system that can be disconnected entirely from the process chamber during the brazing process using high-vacuum valves. Rapid cooling designs of this type are used particularly in brazing for vacuum interrupters, as the final vacuum in this process is subject to very demanding requirements.

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