Abstract
Volume changes occur during sintering and chemical-thermal treatments of metal powder samples. The results of the investigation of the volume change of pressed and boroned samples from an iron powder, depending on the mixture composition used for the boroning process, are presented in this paper. The basic mixture, used for boroning of the investigated samples from iron powder, is modified by the addition of activators with different chemical compositions and in different concentrations, of up to 4 wt %. Mixtures with ammonium bifluoride, ammonium chloride and boron potassium fluoride were investigated. The research results and the mathematical modelling enable the choice of mixture compositions for boroning based on the volume change given in advance.
Highlights
The chemical-thermal treatment of products obtained by powder metallurgy processes is quite a new method and only few papers deal with boroning of iron powder compacts [1,2,3, 11, 12]
The research results and the mathematical modelling enable the choice of mixture compositions for boroning based on the volume change given in advance
Investigation of the linear shrinkage gives some information about the major direction of matter flow during sintering, and offers better understanding of the mechanisms which lead to shrinkage [4, 5]
Summary
The chemical-thermal treatment of products obtained by powder metallurgy processes is quite a new method and only few papers deal with boroning of iron powder compacts [1,2,3, 11, 12]. The results of the investigation of the volume change of pressed and boroned samples from an iron powder, depending on the mixture composition used for the boroning process, are presented in this paper. The basic mixture, used for boroning of the investigated samples from iron powder, is modified by the addition of activators with different chemical compositions and in different concentrations, of up to 4 wt %.
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