Experience, innovation and customer focus are the basic components of this article on vacuum furnace diffusion bonding. Intuitive studying, based on physical concepts and technical testing, has led to an innovative solution for vacuum furnace equipment. This story has started more than 20 years ago...

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When the importance of producing a perfect brazed joint is uppermost, vacuum brazing is a highly effective method of joining two parts. Due to the nature of the vacuum, heat is evenly distributed and part production is consistent. Brazing requires three components: two parent metal pieces and a filler to join them. In the furnace, the components are arranged so that the filler will melt and flow on the base pieces, and join them solidly when cooled. Vacuum brazing provides strength, durability, and reliability unmatched by other metal joining methods. It also requires no secondary fabrication or finishing.

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Keeping furnace downtime to an absolute minimum also means to be able to make the right choice of hot zone. In fact, the hot zone contributes to the performance of the whole system. It has an impact on the process quality, the temperature uniformity, the heating and cooling rates and the furnace's energy consumption. Therefore, which is the hot zone most economical and best performing based on losses and overall power costs? Graphite-based or all-metal design?

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Molybdenum and graphite are the most popular choices as hearth materials in vacuum furnaces. Throughout the last 40 years, the heat treating industry has experienced a significant shift in the type of hot zone most commonly used in furnaces. In the 1970s, most of the heat zones installed were all-metal hot zones. Today, however, the vast majority are graphite-based hot zones. But, what is the most efficient design in order to minimize hot zone losses and reduce power consumption?

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Today there is a great deal of talk about safety PLCs. This, obviously, creates questions such as: why a safety PLC should be installed on my vacuum furnace? Are safety PLCs really useful? What are the advantages compared to traditional safety relays? Therefore, I want to give you 5 good reasons to install a safety PLC to maintain an efficient internal control system.

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