The sinterability of chromium powder
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Chromium compacts with a porosity suitable for filtering applications can be obtained by pressing the starting powder with an addition of 4% paraffin wax.
Firm packing of specimens in a fine alumina filling material protects the chromium against oxidation during sintering in moderately dried hydrogen.
During the sintering of chromium with a paraffin-wax addition to the charge, the rate of heating to the isothermal holding temperature may exert a substantial influence on the shrinkage of compacts.
During the sintering of chromium with a paraffin wax addition to the charge, the sintering process may become activated as a result of the reduction of oxides by the carbon black formed, leading to increased shrinkage compared with pure chromium.
Both pure chromium and chromium with a paraffin wax addition to the charge exhibit good sinterability at temperatures of 1373–1473°K.
KeywordsOxidation Alumina Porosity Chromium Shrinkage
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