コンファインド型アトマイズノズルを用いて生成した合金粉末の粒度

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The influences of the gas jet spouted from the atomizing nozzles, gas and metal flow rate ratio and gas pressure on the median diameter and particle size distribution were investigated. The median diameter of atomized powder varies in proportion to the square root of M_l/M_g value when the atomized powder was formed at various melt or gas flow rate under the same other conditions. The median diameter varies inversely proportional to the mean gas velocity when the powder was atomized using various atomizing nozzles which have different dimension i.e. the apex angle and gas jet nozzle configuration. Approximately the same median diameter powder was obtained at the same gas flow rate regardless of the gas jet pressure. An experimental formula was obtained as follows ; d^<50>_p/D_1=63.6√<(M_l/M_g)・(σ_l/(D_l・ρ_l・V^2_g))・(ν_l/ν_g)> where, d^<50>_p : Median diameter of atomized powder (m), D_l : Diameter of melt delivery tube (m), M_l : Mass flow rate of molten metal (kg/s), M_g : Mass flow rate of atomizing gas (kg/s), σ_l : Surface tension of molten metal (N/m), ρ_l : Density of molten metal (kg/m^3), V_g : Gas velocity (m/s), ν_l : Kinematic viscosity of molten metal (m^2/s), ν_g : Kinematic viscosity of atomizing gas (m^2/s). The fraction of coarse powder increased when the atomization was performed with a concave gas velocity distribution compared to a convex one which is the ordinary case. The calculated particle size distribution coincides roughly with the experimental results. It was shown that the particle size distribution depends on the gas velocity distribution.
社団法人日本鉄鋼協会の論文

コンファインド型アトマイズノズルを用いて生成した合金粉末の粒度

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