《Table 3 Proportion of non-adherent particles under different outgrowth values and atomizing gas pre

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《双喷嘴气雾化技术制备球形AlSi10Mg粉末及其表征（英文）》

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The influence of atomizing gas pressure on particle size and shape distribution has been studied at five levels（2.0，2.5，3.0，3.5 and 4.0 MPa）with a constant superheat of 250 K and a melt delivery tube diameter of 4.2 mm.The cumulative distribution and median diameter trends are shown in Fig.7.As expected，the cumulative distribution curves move to left with increasing atomization pressure which means a reduction of powder size（Fig.7 （a）） ，median particle diameter D50 decreases with increasing gas to melt ratio（GMR）while fine powder yield rate is just on the opposite，as seen in Fig.7（b）.Previous research reported by TING et al[26]also showed that high GMR results in a reduction in medianparticlediameterD50.ACHELISand UHLENWINKEL[3]indicate that a gas mass flow between 100 and 300 kg/h leads to a higher product yield by using a pressure-gas-atomizer.Since the conditions of superheat were identical（250 K）in this part，according to Eqs.（1）-（2），the median particle diameter D50 only relates to gas to metal ratio（GMR）.As seen in prior research，an increase in atomization gas supply pressure caused a steady increasing trend in gas mass flow.Meanwhile，the gas velocity would not be increased with pressureincrease[2，27].Data listed in Table 1 show the similar trend.The melt flow rate increases with the rise of gas pressure，which means that the bottom of the melt delivery tube is always in negative pressure state.