Signature Vacuum furnace for tungsten carbide reclamation installed at Kohsei Co Ltd

February 5, 2013

Signature Vacuum, Meadville, USA, has recently shipped a tungsten carbide reclamation furnace to Kohsei Co., Ltd., in Japan. The furnace utilises the molten zinc reclamation process to produce friable tungsten carbide.

Tungsten_Reclamation_LR

A two zone horizontal vacuum furnace for the

reclamation of tungsten carbide

The reclamation of cobalt cemented carbide with zinc is based on the fact that cobalt is soluble in zinc. At 800°C, cobalt and zinc form a eutectic alloy pulling the cobalt from its cementing position in the carbide mixture.

The unit is a two zone horizontal vacuum furnace designed to operate under vacuum, partial pressure inert atmospheres and up to 5 psig. The furnace is capable of processing 1000 kg per cycle. The control system is designed to allow easy integration into a supervisory control system while still maintaining flexibility in operation. The entire unit is of a modular design to simplify upgrades and repairs.

Signature’s furnace processing concept incorporates two equal sets of crucibles in the vacuum furnace. One is in the heated zone, where the carbide is roasted in the molten zinc, connected by a flow tube to one in the cold zone. At the end of the roasting time, the zinc has evaporated from the heated crucible and condensed in the receiving crucible in the cold zone. The receiver crucible being pre-loaded with tungsten carbide parts is then placed in the heated zone for the next roasting cycle. In this way, the zinc is only handled once on the initial loading.

www.signaturevacuum.com

In the latest issue of PM Review…

Download PDF

Extensive Powder Metallurgy industry news coverage, and the following exclusive deep-dive articles and reports:

  • Burgess-Norton and Amsted Automotive: How a legacy automotive supplier is growing with, not despite, electrification
  • Meeting sustainability demands in PM: High-temperature sintering of nickel- and copper-free powder mixtures for low alloyed PM parts
  • World PM2022: An overview of the status and trends in the global PM industry
  • A novel approach for the production of metal powders with tailored chemical compositions: Amazemet’s rePowder
  • Productivity, flexibility, reliability: SACMI’s new press technologies for the changing PM industry
  • Understanding the thermal properties of metal powders: Characterisation of powders using the Hot Disk technique
  • World PM2022: Views on the potential of Field Assisted Sintering for advanced materials

The latest news from the world of metal powders, delivered to your inbox

Don't miss any new issue of PM Review, and get the latest industry news. Sign up to our weekly newsletter.

Sign up

From the industry…

Discover our magazine archive…

The free-to-access PM Review magazine archive offers unparalleled insight into the world of Powder Metallurgy from a commercial and technological perspective through:

  • Reports on visits to leading PM part manufacturers, metal powder manufacturers and industry suppliers
  • Articles on technology and application trends
  • Information on materials developments
  • Reviews of key technical presentations from the international conference circuit
  • International industry news

All past issues are available to download as free PDFs or view in your browser.

 

Browse the archive

 

Looking for PM production equipment, metal powders, R&D support and more?

Discover suppliers of these and more in our
advertisers’ index and buyer’s guide, available in the back of PM Review magazine.

  • Powders & materials
  • Powder process, classification & analysis
  • PM products
  • Atomisers & powder production technology
  • Compaction presses, tooling & ancillaries
  • Sintering equipment & ancillaries
  • Post-processing
  • Consulting & toll sintering
Download PDF
Share via
Copy link