This part of ISO 4491 specifies a method for the determination of the relative loss of mass which a metallic powder undergoes when heated in a stream of pure dry hydrogen under specified conditions.
The purpose of this test is to evaluate a chemical powder characteristic which is of importance to the powder metallurgical industry. The test is not intended as a means for the determination of the content of specific elements. (See annex A and ISO 4491-1.)
The test method is applicable to unalloyed, partially alloyed and completely alloyed powders of the metals listed in table 1 (see 6.1). It is not applicable to lubricated powders or to mix-tures of metal powders.
The results can be influenced by the presence of reducible, oxidizable or volatile metals, metalloids or compounds (see annex A). The results obtained on such powders shall be used with caution and their interpretation shall be subject to agree-ment between supplier and user.
This part of ISO 4491 shall be read in conjunction with ISO 4491-1.
DS/EN 24491-2:1993 history
2012DS/EN 62282-3-200:2012 Fuel cell technologies - Part 3-200: Stationary fuel cell power systems - Performance test methods
2000DS/EN ISO 4491-2:2000 Metallic powders - Determination of oxygen content by reduction methods - Part 2: Loss of mass on hydrogen reduction (hydrogen loss)
1993DS/EN 24491-2:1993 Metallic powders. Determination of oxygen content by reduction methods. Part 2: Loss of mass on hydrogen reduction (hydrogen loss)