Additive Manufacturing /
Retort furnaces for catalytic debinding

Retort Furnaces for Catalytic Debinding also as Combi Furnaces for Catalytic or Thermal Debinding

Retort furnace NRA 40/02 with cupboard for the acid pump

Acid pump for nitric acid

Retort with internal heating

The retort furnaces NRA 40/02 CDB and NRA 150/02 CDB are specially developed for catalytic debinding of ceramics and metallic powder injection molded parts. They are equipped with a gastight retort with inside heating and gas circulation. During catalytic debinding, the polyacetal-containing (POM) binder chemically decomposes in the oven under nitric acid and is carried out of the oven by a nitrogen carrier gas and burned in an exhaust gas torch. Both retort furnaces have a comprehensive safety package to protect the operator and the surrounding. Exectuted as combi furnace series CTDB these retort furnace can be used for either catalytic or thermal debinding incl. presintering if necessary and possible. The presintered parts can be easliy transferred into the sintering furnace. The sintering furnace remains clean as no residual binder can exhaust anymore.

  • Retort made of acid-resistant stainless steel 1.4571 with large swiveling door
  • Four-side heating inside the retort through chromium steel tube heating elements for good temperature uniformity
  • Horizontal gas circulation for uniform distribution of the process atmosphere
  • Acid pump and acid vessel (to be provided by the customer) accommodated in the furnace frame
  • Gas-fired exhaust gas torch with flame monitoring
  • Extensive safety package with redundantly operating safety PLC for safe operation with nitric acid
  • Large, graphic process control H3700 for entering data and for process visualization
  • Emergency tank for flushing in case of a failure
  • Defined application within the constraints of the operating instructions

Version NRA .. CDB

  • Tmax 200  °C
  • Automatic gas supply system for nitrogen with mass flow controller
  • Adjustable acid volume and correspondingly adjusted gas spply volumes

Version NRA .. CTDB

  • Availabel for 600 °C and 900 °C with atmosphere circulation

Additional equipment

  • Scale for the nitric acid vessel, connected to the PLC monitors the acid consumption and visualizes the fill level of the acid vessel (NRA 150/02 CDB)
  • Lift truck for easy loading of the furnace
  • Cupboard for acid pump
  • Process control and documentation via Nabertherm Control Center (NCC) for monitoring, documentation and control
ModelTmaxInner dimensions in mmVolumeOuter dimensions3 in mmHeating power inElectricalWeightAcidic quantityNitrogen
 °Cwdhin lWDHkW2connection*in kg(HNO3)(N2)
NRA 40/02 CDB2003004503004014001600240023-phase1800max. 70 ml/h1000 l/h
NRA 150/02 CDB200450700450150165019602850203-phase11650 max. 180 ml/hmax. 4000 l/h
1Heating only between two phases *Please see page 73 for more information about supply voltage
2Depending on furnace design connected load might be higher3External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.