On the energy of the 8 2 − 1479-keV level in 178Hf

“…As it is shown above, liquid tin at 820 °С spreads on the cobalt surface poorly. Alongside with this, it is known from literature [9,10] that under vacuum at temperatures of over 800 °С tin wets copper and spreads on its surface strongly. As a result of interaction with tin at the sintering temperature, all particles of copper were dissolved in the liquid phase.…”

mentioning

confidence: 93%

“…Due to this, when the liquid and solid phases interact, the intermetallic compounds of cobalt and tin are not formed. It is known that copper has a high chemical affinity to tin but an essentially smaller one to cobalt [7,9]. This is confirmed by copper forming a number of intermetallic compounds with tin while with cobalt it forms a system with limited solubility and peritectic transformation.…”

mentioning

confidence: 99%

Interaction of Components of Co-Sn and Co-Sn-Cu Powder Materials in Liquid Phase Sintering

Sokolov

Ozolin

Svistun

et al. 2019

MSF

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The interaction of components and structure formation were studied in liquid phase sintering of Co-Sn and Co-Sn-Cu powder materials. The powders of commercially pure metals were mixed with an organic binder and applied on the steel substrate. Sintering was performed under vacuum at temperatures of 820 and 1100 °C. The structure of sintered alloys was investigated by X-ray diffractometry and electron probe microanalysis, and microhardness (HV0.01) of the structural components was measured. It has been found that the nature of interaction of the liquid tin with the solid phase at the initial stage of sintering affects the formation of structure and porosity of Co-Sn and Co-Sn-Cu alloys considerably. In Co-Sn alloys, diffusion of tin into cobalt particles leads to the formation of intermetallic compounds, which hinders spreading of the liquid phase. This results in a porous defect structure formed in Co-Sn alloys. In Co-Sn-Cu alloys, at the initial stage of sintering the liquid phase enriched with copper is formed that wets the cobalt particles and contributes to their regrouping. As a result of this, materials with minor porosity are formed.

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