Chu Z.-Q.,Central South University |
Chu Z.-Q.,Hunan Research Institute of Metallurgy and Materials |
Guo X.-Y.,Central South University |
Zhang L.,The State Key Laboratory of Powder Metallurgy |
Liu D.-H.,Hunan Research Institute of Metallurgy and Materials
Fenmo Yejin Cailiao Kexue yu Gongcheng/Materials Science and Engineering of Powder Metallurgy | Year: 2015
The prealloy powders used in diamond matrix were produced by super high pressure water atomization technology. The diameter and micrograph of prealloy powders were measured by laser scattering particle analyzer and scanning electron microscope. The effects of atomizing pressure, alloy melt superheat and diameter of delivery on the average diameter and micrograph of prealloy powders were studied. The results show that, with increasing atomization pressure, alloy melt superheat and decreasing diameter of delivery, the average diameter of the powder decreases, and the micrograph of prealloy powders changes from spherical to similar spherical and then to irregular shape. When the atomization water pressure is over 60 MPa and the alloy melt superheat is above 250 ℃, increasing water pressure and alloy melt superheat has no obvious effect on the powders diameter. The delivery will be frequently stopped when the diameter of delivery is less than 2.0 mm. © 2015, Central South University. All right reserved.