Effect of Addition of Small Amount of Zn on Properties of SnSb8Cu4 Babbitt Alloys
The effect of 0.83wt%Zn on microstructure,hardness and high temperature creep resistance of SnSb8Cu4 Babbitt alloys is studied.The results show that after addition of Zn,a large number of fine dispersed SnSb particles are precipitated in SnSb8Cu4 matrix and tend to precipitate along grain boundaries in Sn matrix,the total volume fraction of intermetallic compound Cu6Sn5 and SnSb particles increases from 14.9%to 21.2%;the increase of Brinell hardness at room temperature is not obvious,but the creep resistance at 100℃is significantly improved.The addition of Zn reduces the solid solubility of Sb in Sn matrix,causing more SnSb particles to precipitate along grain boundaries and providing a pinning effect on grain boundary sliding during creep deformation,thereby improving creep resistance.During steady-state creep stage,the indentation creep rate has an exponential relationship with indentation stress.Based on measured data,the indentation stress exponents of SnSb8Cu4 and SnSb8Cu4Zn are derived to be 2.95 and 2.73,respectively.
plain bearingtin based Babbitt alloymicrostructurehardnesscreep test
NETL
NSTL
万方数据
