Tracer diffusion of silver and tin in a dental alloy (Ag3Sn).
Tracer diffusion of silver and tin in a dental alloy (Ag3Sn).
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银和锡在牙科合金 (Ag3Sn) 中的示踪扩散。
DOI：
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发表时间：
1974
期刊：
影响因子：
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通讯作者：
M. McLain
中科院分区：
文献类型：
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作者：
T. Okabe;R. Hochman;M. McLain
用Gruzin法测定了Ag3Sn块体中Ag110m和Sn113的扩散系数。在200 ~ 400°C的温度范围内测定了体积扩散系数，其温度依赖性为D = 1.03 × 10−3 exp （- 22400 /RT）和D = 4.01 × 10−4 exp (- 22800 /RT) cm2/sec。银是体积Ag3Sn中移动速度最快的物质，这一事实对汞化过程很重要。另一方面，发现锡示踪原子沿晶界的扩散速度比银原子快。然而，锡更快的晶界扩散可能不是实际汞齐化过程中的决定性因素，因为汞的渗透超过了锡原子沿晶界的迁移。
The diffusivities of Ag110m and Sn113 in bulk Ag3Sn were measured using the method of Gruzin. The volume diffusion coefficients were determined over the temperature range 200 to 400°C, with temperature dependence given by D 1.03 × 10−3 exp (−22,400/RT) and D = 4.01 × 10−4 exp (−22,800/RT) cm2/sec. The fact that silver is the faster moving species in bulk Ag3Sn is important to the amalgamation process. On the other hand, it was found that along grain boundaries, tin tracer atoms diffused faster than did silver atoms. Faster grain boundary diffusion of tin, however, may not be a decisive factor in the actual amalgamation process, since mercury penetration exceeds the migration of tin atoms along grain boundaries.