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用水雾化制取以铜为基体的合金粉末时,因为被高压水流击碎的液态微粒在表面张力作用下,球化所需要的时间远小于凝固时间,故不容易得到形态复杂,松装密度较小的粉末。如果将氧气与空气混合后引入雾化区间,造成雾化在氧化性气氛中进行,使刚被高压水流击碎的微小金属液滴的表面被立即局部氧化而失去表面张力的作用,经冷却凝固后粉末为不规则形状。用这种方法制取的锡青铜粉和黄铜粉其松装密度与采用空气雾化时的松装密度接近。其粉末颜色均匀,压缩性能、烧结性能都很理想,含氧量较空气雾化粉末低。
When water is used to atomize the copper-based alloy powder, the time required for spheroidization under the surface tension is far less than the solidification time due to the liquid particles crushed by the high-pressure water stream. Therefore, it is not easy to obtain the complicated morphology and bulk density Smaller powder. If oxygen is mixed with air and then introduced into the atomization zone, the atomization is caused to proceed in an oxidizing atmosphere, so that the surface of the minute metal droplets immediately crushed by the high-pressure water stream is immediately oxidized to lose the surface tension. After cooling and solidifying After the powder is irregular shape. The tin-bronze powder and brass powder obtained by this method have a looseness close to the looseness when air-atomized. Its powder color uniformity, compression performance, sintering performance are ideal, oxygen content than the air atomized powder low.