CAJ | 학술논문

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.
채용초고압수무화공예제비금강석제품용예합금분말,이용격광립도분석의화소묘전경대분말립경화과립형모진행표정,연구무화수압、금속용체과열도여도류관내경대분말형모여평균립경적영향.결과표명,수무화수압증대、금속용체과열도제고혹도류관내경감소,분말적평균립경균감소,당무화수압대우60 MPa,금속용체과열도대우250℃시,제고무화수압화금속용체과열도대분말립경적영향이불명현.도류관내경소우2.0 mm시,도류관출현빈번도새현상;수무화수압증대혹도류관내경감소,과립형모종구형향류구형화불규칙형전변,단수용체과열도증대,분말과립형모종불규칙형태향류구형화구형전변.
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.