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Effect of heating rate on the synthesis of nickel aluminides by reactive sintering.

100%

Gialanella S. , Pieczonka T. , Molinari A. , Kazior J.

tom R. XIX, nr 4

909-912

Dimensional changes occuring during reactive sintering of three different elemental nickel - aluminium powder mixtures were investigated. Sintering process of powder compacts was curried out under vacuum in a horizontal dilatometer at a various heating rates. The synthesis reaction proceeded with a sudden release of heat and sudden dimensional changes, corresponding to the appearance of liquid phase in the system. Heating rate is a crucial parameter affecting the dominant sintering mechanisms: both extensive shrinkage as well as extensive swelling were observed for each investigated mixture composition depending on the actual heating rate. At slower heating rate the synthesis reactions were initiated and developed between solid powders of nickel and aluminium. In these cases, owing to the limited amount of liquid phase which developed, a swelling of compacts was observed. However, at the higher heating rate solid state reactions were limited and after transient swelling also shrinkage was observed.

Influence of the production parameters on the properties of the sinters made from displaced copper powders.

100%

Leżański J. , Gacek S. , Radoń A. , Olszewska I.

tom R. XIX, nr 4

1203-1205

In this paper the production parameters influence on the properties of sinters made from copper powder which are obtained on the first stage of hydrometallurgical processing by displacing from copper fire scale, are presented. Pressed powder compacts density and sinters density were investigated. Also sinters bending strength, hardness, electric resistance were measured and sinters structure was observed and analysed. In described experiment sinters with very high properties were obtained and this indicate high suitability of the use of hydrometallurgical copper powders for application in powder metallurgy technology.

Crystallite orientation distribution analysis of the cold rolled textures of powder iron strip.

88%

Pańta A. , Szczepanik S. , Chruściel K.

tom R. XIX, nr 4

1219-1222

In this work the results of the texture investigations in cold deformed sintered powder iron strips made from powder WPL-200 type are presented. Textures of starting materials with different densities were measured. These materials were deformed by rolling in deformation range from 0 to 40%. Weak textures were found in powder iron strips no mater what was their starting density.