Delubrication of PM Components Based on Cr-Prealloyed Steel Powder – Chances and Risks
Paper in proceedings, 2011

Utilization of prealloyed powder grades for production of high-performance PM structural parts require reconsidering of specific stages of sintering process like debinding. Modern lubricants are complex organic compounds, decompositions of which leads to production of a number of species – from complex hydrocarbons to carbon oxides. Composition and amount of decomposition products are strongly determined by the temperature profile and processing atmosphere composition/purity. Uncontrolled delubrication process, especially in the case of the PM components containing elements with high-sensitivity to oxygen, can lead to considerable oxidation. Therefore, in-situ monitoring of the processing parameters during delubrication is presented utilizing commonly used in industry sensors (dew-point, CO2 and O2). Delubrication was monitored in a number of inert and reducing gases of the different purity. Based on the specimens analysis and gas monitoring profiles it is recommended to perform delubrication at the temperatures below 500°C in dry inert atmospheres in the case of ethylenbisstearamide-based lubricants.

processing atmosphere control

delubrication

sintering atmosphere

alloyed sintered steels

Author

Eduard Hryha

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Seshendra Karamchedu

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Lars Nyborg

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Proc. of EURO PM2011 Congress & Exhibition, 9-12 October 2011, Barcelona, Spain

Vol. 3 105-110

Driving Forces

Sustainable development

Subject Categories

Manufacturing, Surface and Joining Technology

Other Materials Engineering

Areas of Advance

Materials Science

ISBN

978-1-899072-23-1