The fluidization characteristic and defluidization behavior of iron powder was investigated at higher temperature in a visual fluidized bed reactor. Influences of fluidizing gas velocity and particle size on defluidization temperature was studied. Results showed that the defluidization temperature increased with increasing fluidizing gas velocity and particle size. The minimum fluidization velocity at different temperatures was measured. Results showed that the minimum fluidization velocity increased with increasing temperature. The thermo-mechanical analysis indicated that the surface viscosity decreased with temperature, suggesting an increase of adhesion force between particles. Based on viscous flow theory, the mechanism of fluidization transition and defluidization was discussed.%利用高温可寸对粘结温度的影率的测定结果表面视流化床研究了金属铁颗粒的响。结果表明，气速越高，粒明，初始流化速粘度降低，颗粒率在高温下随温间粘性力增大高温流化特性和径越大，粘结失粘结失流化行流化越难发生度升高而增大。。结合粘性流理为。探讨了流化。不同温度下颗热机械分析表论，探讨了金属明，随着温度的铁颗粒流化特气速，颗粒尺粒初始流化速升高，颗粒表性转变和粘结失流化的机理。
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