Sintering of the Cu-Sn-P-MoS2 Powder Composite at 780 °C

 
O.Fushchich,
   

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2013, #11/12
http://www.materials.kiev.ua/article/957

Abstract

The influence of the initial porosity of samples compacted from Cu + 9Sn + 1.5P + (5, 10, 15%) MoS2 powder compositions and the amount of molybdenum disulfide MoS2 on their growth during sintering in hydrogen at 780 °С is studied. It is established that their growth decreases with increase in the initial porosity of samples of the same sizes with equal MoS2 contents and that their growth increases with a higher amount of MoS2 in samples of the same sizes compacted to equal porosities. Water vapor that evolves during reduction of oxides present on the surface of the initial tin powder and copper–phosphorous alloy powder by hydrogen causes the swelling of samples. Moreover, phase transformations in the material during sintering can lead to an increase in the volume of samples as new phases are formed (copper sulfide Cu2S) with a larger crystal lattice that that of the matrix and molybdenum disulfide.


DECOMPOSITION, GROWTH, OXIDE, POROSITY, POWDER COMPOSITION, SINTERING, TEMPERATURE