Carbolite - Industrial Rotary hearth furnaces

Industrial rotary hearth furnaces

For compact sintering facilities using patented powder metal technology for the production of gold, silver and platinum wedding rings
Powders are produced directly from the molten state and formed into rectangular sections known as compacts which require sintering
The ring compacts are sintered in trays holding several hundred at a time
Loading into the furnace is through the entry aperture
The hearth pauses every 10° to allow another tray to be loaded, with the length of the pause adjustable to determine the length of the sintering cycle
The rings are processed at 750°C to 800°C within a 95% nitrogen & 5% hydrogen atmosphere
The furnace has been designed to allow for a sintering process lasting up to 24 hours
Heated by 27 wire spiral resistance elements supported on ceramic tubes mounted horizontally above the furnace hearth
The atmosphere is sealed in the furnace by two oil-filled troughs below the furnace hearth and curtains at the loading and unloading positions

For heat treating titanium parts
Charge 120kg/hour
Chamber dimensions: hearth – 1200mm OD refractory disc
Hearth constructed from hardwearing ceramic which is rotated through a sand seal via a variable speed motor
Free radiating Kanthal “AF” elements mounted horizontally above the hearth in three zones
Nitrogen is introduced into the chamber via the element terminal box. Maximum flow is approximately 200 l/min
An oxygen probe monitors the atmosphere in the working chamber at a temperature above 750ºC
Working temperature up to 1150°C
Uniformity : ± 8°C for 180°C of hearth rotation directly opposite the door
Three zones controlled by Eurotherm 2216 three term digital instruments
located in a free standing control module
Power rating : 80kW
Power supply : 3 phase 415/240V 50Hz