超高压水雾化工艺参数对金刚石胎体用预合金粉末粒度与形貌的影响  

Effect of super high pressure water atomization parameters on diameter and micrograph of diamond matrix prealloy powders

作　　者：储志强[1,2] 郭学益[1] 张立[3] 刘东华 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083 [2]湖南省冶金材料研究院,长沙410129 [3]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2015年第5期808-814,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家科技部创新基金资助项目(10C26214302569);湖南省科技计划重点项目(2010SK3172)

摘　　要：采用超高压水雾化工艺制备金刚石制品用预合金粉末,利用激光粒度分析仪和扫描电镜对粉末粒径和颗粒形貌进行表征,研究雾化水压、金属熔体过热度与导流管内径对粉末形貌与平均粒径的影响。结果表明,随雾化水压增大、金属熔体过热度提高或导流管内径减小,粉末的平均粒径均减小,当雾化水压大于60 MPa,金属熔体过热度大于250℃时,提高雾化水压和金属熔体过热度对粉末粒径的影响已不明显。导流管内径小于2.0 mm时,导流管出现频繁堵塞现象;随雾化水压增大或导流管内径减小,颗粒形貌从球形向类球形和不规则形转变,但随熔体过热度增大,粉末颗粒形貌从不规则形态向类球形和球形转变。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.

关 键 词：超高压水雾化 胎体预合金粉末 雾化工艺参数 粉末性能 

分 类 号：TF123.2[冶金工程—粉末冶金]