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predicted by the phase diagram, by simply considering the composition of the material. Among them, liquid phase may The microstructural evolution during sintering of form which in uences the sintering mechanisms and the 10% bronzes obtained by mixing elemental powders dimensional behaviour. 4 ± 6 Therefore, the study of the copperwas studied, in order to investigate the mechanisms tin interaction does not have a simple microstructural responsible for microstructural homogenisation, coninterest only, but has a noticeable impact on the process solidation of the green compacts, and dimensional design and control and on the technological properties of variation. The eVect of the copper powder was also the components. studied using an electrolytic and an atomised com-The present study investigates the transformations which mercial powder. As a consequence of the diVerent occur during sintering of 10% Sn bronzes obtained by mixes surface area and surface chemistry, and of the presence of elemental copper and tin powders and the in uence of of internal pores and microcavities in the atomised the copper powder. In fact, two diVerent copper powders copper powder, the two mixes display signi cantly were used, one electrolytic and the other water atomised, diVerent dimensional behaviour but, under speci c time the latter having been speci cally developed as an alternative and temperature conditions, they give rise to the same to the former for the production of bearings. Dilatometry dimensional variation and the same microstructural was used as the experimental technique to sinter green parts characteristics.P M /0962 because of its sensitivity to phase transformations involving speci c volume changes, such as the formation of the liquid Dr M enapace, D r Zadra, and Professor M olinari phases. 7, 8 A detailed microstructural characterisation was

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