Literature Powder production Fundamentals Copper Iron and Steel
Ceramic materials Hard materials and toot steels Tungsten-coppera[toys Titanium materials Refractory metals High-performance PM materials General topics Sintering
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Powder production Jet break-up of liquid metal in twin-jet atomisation S.Markus et al. (University of Bremen, Bremen, Germany.) Mater. Science/Engineering A, Vo1326, No l, 2002, 122-133.
Mechanisms of disintegration of the metal streanr during twin fluid atomisation with inert gas, are discussed and it is noted that several stages are involved which influence spray characteristics. Effects of material properties on the primary break-up of the metal stream were investigated experimentally and analytically. Results of a linear instability analysis are discussed and compared with evaluations of highspeed video images. Periodicity and the main mechanisms in the initialisation process are examined.
Fundamentals Rapid prototyping and manufacture P.F.Jacobs. (Laser Fare - Advanced Technol<)gy, Warwick RI, USA.) PM Science and Technology Briefs, Vo 3 No 2, 2001, 5-8.
Development of rapid prototyping and manufacture is reviewed with particular reference to
MPR November 2002
Literature u s e of PM methods and technology. Initially the production of any artefact was slow and laborious, but the advent of the computer and application to design and manufacture greatly accelerated the process. In the case of metal powders the use of a computer allows an artefact to be built up layer-by-layer until completed.
Effect of size distribution on tapping
properties of fine powders M.Suzulci et al. (Himeji Inst. of Technology, Himeji, Japan.) Powder Technol. , Vol 1 i8, No I/2, 2001,53-57.
It was noted that there is little published data concerning effect of size on packing of powders smaller that 50ram. Tapping properties were investigated for powders with a log-uniform size distribution, it was found that the void fraction of the tapped powders was dependent on particle size distribution and that the void fraction decreased with decreasing slope in the size distribution graph. Minimum void content was found at a Fuller constant of 0.7 to 0.9. Experimental results were compared with a model.
Linear packing density model for
powder particles W.Haibing et al. (State Key Laboratory of PM, Changsha, Chi~uT.) PM Technology, Vol 19, No 4, 2001, 208-211. In Chinese.
A linear packing density model is discussed. The model was modified to give improved agreement with experimental data. A new model is described and is compared with the linear packing density model. Other packing density models are reviewed.
Effect of corrosion on magnetic and mechanical properties of ferritic stainless steels K.Kusaka et al. (Daido Inst. of Technology, Nagoya, Japan.) J.Japan Soc. Powder~PowderMetalI., Vo148, No 2,200i, 191-195. In Japanese.
Samples of sintered and HIP 434L stainless steel, with 1 or 2wt%Si, were subjected to corrosion in boiling 5% sulphuric acid. Magnetic and cold radial crushing tests were carried before and after corrosion. It is reported that weight loss in corrosion decreased with increase in density. Magnetic properties declined with increase in weight loss. Strength was degraded by corrosion due to surface condition.
Ceramic materials Development of ceramic materials for electronic components T.Nomura. (TDK Corporation, Narita, Japan.) J.Japan Soc. Powder/Powder Metall., Vol 48, No 3, 2001,222232. In Japanese.
Ceramic materials, including ferrites, multilayer ferrite chips and capacitors for use in electronic devices were reviewed with reference to the need for reliability and low loss characteristics. New production techniques are shown with regard to microstructures and the importance of control of composition, additives, O content and process conditions.
Mechanical properties of multi-layer ceramic capacitors T.Nomura et al. (TDK Corporation, Narita, Japan.) J.Japan Soc. Powder~Powder Metall., Vol 48, No 3, 2001,233-236. In Japanese.
Copper Copper-base shape memory alloys Y.Suzuki et al. (Hokkaido National Industrial Research Inst., Sapporo, Japan.) J.Japan Soc. Powder~Powder Metall., Vo148, No 3, 2001, 209-213. In Japanese.
Studies to improve shape memory properties of Cu shape memory alloys at low temperatures were described. Additional elements were added to the base Cu-AI-Ni composition. Samples were made by exothermic reaction. It is reported that by addition of B or B and C to Cu-AI-Ni-Ti reversible shape memory behaviour was improved below 0°C.
Iron and steel
The effects of process conditions on the mechanical properties of multilayer ceramic capacitors was investigated. It is shown that barrel finishing caused a degradation of properties that could be recovered by heat treatment. The deterioration is attributed to internal s t r e s s e s .
Low-temperature sintering of
magnesium-copper-zinc ferrites I.Nakahata et al. (TDK Corporation, Narita, Japan.) J.Japan Soc. Powder~Powder Metall., Vol 48, No 2, 2001, I26-130 and 131-135. In Japanese.
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