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Comparison of hot zone concepts: for demanding thermal processes there exist different concepts for vacuum furnaces, which compete against each other.(Heat Treatment)

Publication: Furnaces International
Publication Date: 01-JAN-04
Format: Online - approximately 1243 words
Delivery: Immediate Online Access

Article Excerpt
With respect to material selection, basically three different types of hot zones are used in high temperature vacuum furnaces: all metal hot zones; insulated hot zones (ceramic, graphite, board insulation); and the hybrid hot zones (using aspects of the all-metal and insulated type). Inside 1...

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...each of these basic groups several variations have been developed. Table compares some hot zone types with respect to their operation characteristics and process suitability.

In the past all metal hot zones have been said to have some major weaknesses like higher energy consumption, shorter lifetime, higher capital cost and higher maintenance costs compared to insulated type hot zones. During the last decade however, Plansee has focused on the development of all metal hot zones with the goal to minimise these weaknesses. Special effort has been put into the introduction of High-Performance Materials (HPM) like Plansee ML molybdenum, fundamental design development and fabrication progress. The result of these activities is a family of all metal and hybrid hot zones providing excellent performance, superior quality and economy.

Energy consumption

All metal hot zones have proven the...

NOTE: All illustrations and photos have been removed from this article.



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