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蒙乃尔合金凭借其优良的耐高温、抗腐蚀和良好的抗高温冲击,在化工、核工业、石化等诸多领域得到广泛应用。结合流化床布气元件的使用工况和对多孔性能要求,选用蒙乃尔合金粉末制备多孔气体布气板。通过对粉末性能、成形压力和烧结温度等影响最大孔径、透气度主要因素的分析,认为,球形蒙乃尔粉末有利于开孔的形成,能有效增大多孔气体分布板的透过性。结果表明,粉末粒度大、粒度范围窄、压制压力越低,所对应的最大孔径和透气度相对较大;反之,最大孔径和透气度相对较小。烧结工艺是影响蒙乃尔多孔布气元件性能的主要因素,利用球形蒙乃尔粉末制备多孔板时,需要进行慢速升温和梯度保温工艺实现烧结。根据布气元件的工况要求,烧结温度选在1 150℃~1 300℃之间较为理想。
Monel alloy by virtue of its excellent high temperature, corrosion resistance and good high temperature impact, in the chemical industry, nuclear industry, petrochemical and many other fields are widely used. Combined with the use of fluidized bed cloth gas components and the porous performance requirements, the choice of Monel alloy powder prepared porous gas distribution board. According to the analysis of the main factors influencing the maximum pore diameter and air permeability, such as powder properties, forming pressure and sintering temperature, it is considered that the spherical Monel powder is conducive to the formation of open pores and can effectively increase the permeability of the porous gas distribution plate. The results show that the larger particle size, narrower particle size range and lower pressing pressure correspond to the larger maximum pore size and air permeability; on the contrary, the maximum pore size and air permeability are relatively small. Sintering process is the main factor affecting the performance of Monel’s porous gas components. When using spherical Monel powder to prepare porous plates, it is necessary to carry out slow temperature rise and gradient heat preservation process to achieve sintering. According to the working conditions of gas distribution components, the sintering temperature is selected between 1 150 ℃ ~ 1 300 ℃ is ideal.