本文对等离子喷焊用高铬铸铁粉末的合金成分和水雾化制粉工艺进行探讨。结果表明一般的高铬铸铁粉末中加入硼和硅,可提高自熔性,降低粉末的含氧量和使粉末的形状趋于球形:同时硼还显著地提高喷焊层的耐磨性。水雾化制粉工艺中采用大直径的金属液流嘴和低的雾化水压,可获得性能较好的等离子喷焊用粉末。研制的4C-25Cr-1B-1Si粉末已在煤炭、农机、交通等部门的耐磨件上应用。 In this paper, plasma spray welding of high-chromium cast iron powder alloy composition and water atomization milling process are discussed. The results show that the addition of boron and silicon to typical high chromium cast iron powders increases self-flux, decreases the oxygen content of the powder, and tends to make the shape of the powder more spherical: while boron also significantly increases the wear resistance of the spray coating. Water atomization milling process using large diameter metal nozzle and low atomization water pressure, get better performance of plasma spray powder. Developed 4C-25Cr-1B-1Si powder has been in the coal, agricultural machinery, transportation and other departments wear parts on the application.