【摘要】 本文由粘性流体动力学方程组导出溶潭内涡旋、速度及温度的分布。求得合金Fe₄₀Ni₄₀P₁₄B₆的热边界层厚度ΔR_T及粘性切变层厚度ΔR_v分别是140μm及11μm。在非晶带-溶潭的交界面处淬火速率是4.6—2.3×10⁶℃/s,而固化时间则是0.8—1.6×10^-4s。非晶宽带的厚度h与宽度b的经验公式在3—5%范围内与实验数据一致。h及b与线速度v_r之间的关系式可用近于理想冷却模型加以描述。Prandtl准数Pr=7.8×10^-2说明热边界层厚度比粘性切变层厚度大13倍,而Nusselt准数Nu=1—2表明非晶带-铜辊的交界面处于居间冷却状态。更多还原

【Abstract】 The distribution of vorticity, velocity and temperature of the melt puddle were obtained by the viscous hydrodynamic equations. It is found that the thickness of thermal gradient layer, ΔR_T, and viscous shear layer, ΔR_v, of the alloy Fe₄₀Ni₄₀P₁₄B₆ are 140 and 11μm respectively. The quench rate on the ribbon at the ribbon-melt interface is （4.6—2.3）×10⁶℃/s, and the solidification time is （0.8—1.6）×10^-4s. The empirical equations of thickness, h, and width, b, of the amorphous wide ribbons are in accord with the experimental data in the range of 3—5%. The observed relations among h, b and wheel velocity, ν_r, are well described by the model of nearly ideal cooling. The Prandtl number, Pr=7.8×10^-2 indicating the thermal gradient layer was 13 times thicker than the viscous shear layer, and the Nusselt number, Nu=1—2 indicated intermediate cooling condition at the ribbon-wheel interface.更多还原