Cold-Wall Retort Furnaces for Residual Debinding and Sintering

Cold-Wall Retort Furnaces for Residual Debinding and Sintering

Category: Metal Injection Molding (MM) Available
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Description

The cold wall retort furnaces of the VHT series are designed as high-temperature furnaces, including graphite or molybdenum/tungsten heating. The vacuum-tight retort allows heat treatment processes either under flammable or non-flammable process gases or in a vacuum.

Two variants, tailored to different sintering processes, are available for debinding and sintering MIM components.

Cold-Wall Retort Furnaces for Sintering in Hydrogen 

The VHT ../15-MO MIM design is based on the product line with molybdenum/tungsten heating unit and insulation and a hydrogen safety package. The core of this design is a tried and tested safety package that enables safe operation at all times and initiates an appropriate emergency program in the event of a malfunction. 

This design is the best choice for sintering stainless steel.

Cold-Wall Retort Furnaces for Sintering in Inert Gas 

Furnaces in the VHT ../15-GR MIM range are equipped with graphite heating and insulation as well as a safety package for residual debinding and sintering with non-flammable process gases. 

This design is a very good choice for sintering low-alloyed steel.

Inner Process Box for Residual Debinding 

Due to the release of residual binders before the sintering process, the furnace chamber is equipped with an additional inner process box through which the exhaust gas is directly vented to the exhaust stack. This system significantly reduces contamination of the furnace chamber by gases generated during the debinding step. In addition to optimizing temperature uniformity, the process inner box ensures excellent gas flow across the components due to the gas distribution plate on the rear wall. For a graphite furnace, the inner box is made of graphite, while for a metallic-heated furnace, a box made of molybdenum (potentially tungsten-reinforced) is used.

The standard equipment for sintering furnaces includes a complete set of carrier shelves, as listed in the table. Adjustments to the usable space and the inner process box when using carrier shelves with different dimensions are optionally possible.

Heated Gas Outlet 

To minimize binder condensation in the exhaust gas line as much as possible, the area of the gas outlet between the outlet from the inner process box and the torch is heated with heating tapes and, if necessary, is also insulated.  

For optimum temperature management of the exhaust gas to the torch, depending on the size of the furnace, the exhaust gas line is divided into different zones. In these zones, the temperatures of the heating tapes can be controlled differently depending on their position.

Additional Equipment

 
Model1 Volume Work space in mm Quantity Number of shelves 170 x 250 mm Shelves
Work space
Outer dimensions in mm Weight
GR/MO
  in l w d h levels total (level) in m² W D H2 in kg
VHT 40/15 .. MIM 40 340 500 240 6 24 (2x2) 1 1900 3300 2850 2700/3500
VHT 80/15 .. MIM 80 340 750 320 8 48 (2x3) 2 2000 3500 3000 3000/4000
VHT 160/15 .. MIM 160 500 680 480 12 96 (2x4) 4 2300 4100 3400 7500/8500
VHT 320/15 .. MIM 320 680 750 640 16 192 (4x3) 8 2500 4300 3500 900/10000
1MO: Molybdenum, GR: Graphite
2Including exhaust gas torch

More detail about Obsnap Instruments Sdn. Bhd.
Obsnap Instruments Sdn. Bhd.
Obsnap Instruments Sdn. Bhd. Climatic Test Chamber Manufacturer Malaysia, Test & Measuring Instruments Supplier Selangor, KL ~ MERIDIAN
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