By F. Thummler, R. Oberacker
Booklet through Thummler, F., Oberacker, R
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Extra info for B0490 Introduction to powder metallurgy
Thus, most of the metals can be precipitated from alkaline solutions and only a few such as Cu and Ag from stronger acidic liquids. The precipitation potential of the complex ammine ion of Co and Ni is not very different from that of the simple hydrated ions shown in the figure. Furthermore, there is no large dependence of the potential on the ion concentration, (as shown on the left and right hand sides, respectively, of this figure), which provides the possibility of nearly full deposition of Co and Ni Powder Production Techniques Volts 35 Volts Met~1 potenti~I,25·C Zn·· -0-6 -o-s - -0·4 -0'4 o oE ('I) E I -0·2 ::.
This type of mill is no longer in service. New types of jet-mills of different design are widely used, but mainly outside the field of powder metallurgy. Mechanical Alloying Mechanical alloying is a high-energy ball milling process for producing composites with a controlled, even distribution of a second phase in a metallic matrix. 3), in which strengthening by precipitations and dispersed oxides is combined. The process enables the development of special microstructures essential for achieving good high-temperature mechanical properties in multiphase powder metallurgy materials.
27) along with an increase of specific energy consumption. Clean Cu powder has a strong tendency to oxidize, especially when exposed in air of high humidity. This is a result of a high concentration of lattice and surface defects and is a problem for prolonged storage and during handling, but can be reduced by annealing at a moderate temperature. Some stabilizing treatment is often applied to provide a very thin protective coating, which is not harmful for the subsequent pressing and sintering process.