摘要
针对粉末冶金方法制备复杂流道结构喷嘴存在的制造成本高、加工难度大等问题,提出一种基于熔融沉积成型与烧结(FDMS)技术的金属-金刚石复合材料喷嘴成型制造方法,并分析了熔融沉积打印参数与脱脂工艺参数对喷嘴质量的影响。结果表明:在热脱脂过程中,粘结剂的气体扩散通道的数量会显著影响生坯的脱脂效果,适当增加气体扩散的通道并选择陶瓷相材料作为流道成型的打印材料,能够减少生坯脱脂后出现的塌陷、变形等缺陷,并可确保烧结后喷嘴内部通道的完整性;当生坯脱脂后形貌保持较好时,烧结后的喷嘴能够维持良好的端面形态及流道结构,但是相较于生坯流道尺寸,烧结后的喷嘴流道尺寸沿径向收缩了约14%;微观组织分析表明试样内部未出现断裂缺陷,金刚石颗粒均匀分布在金属胎体内,喷嘴的质量初步达到预期效果。
The powder metallurgy method for preparing nozzles with complex runner structures involves high manufacturing costs,processing difficulties and other issues.This paper proposes a nozzle modeling and manufacturing method based on fused deposition modeling and sintering(FDMS)technology,and analyzes the impact of the fused depositon printing parameters and debinding process parameters on nozzle quality.The conclusions can be drawn as follows:during the thermal debinding process,the evaporation pathways of the binder inside green parts significantly influence the debinding efficiency,appropriately increasing the evaporation paths of the binder and choosing the ceramic composites as the main material for the modeling of flow channel,thereby ensuring the integrity of internal channels after post-sintering.when the brown parts can retain a good morphology,the sintered nozzles retain a good end face and flow channel morphology,however,compared to flow channel size of the green parts,the sintered flow channel size shrinks by about 14%in the radial direction.The microstructure analysis indicates that,there is no fracture defect inside the specimen,and the diamond particles are uniformly distributed in the matrix,the quality of the nozzle has preliminarily reached the expected results.
作者
吴冬宇
刘玉杰
张绍和
孔祥旺
何焘
张谦
WU Dongyu;LIU Yujie;ZHANG Shaohe;KONG Xiangwang;HE Tao;ZHANG Qian(Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Central South Unversity,Changsha 410083,China;School of Geosciences and Info-Physics,Central South University,Changsha 410083,China)
出处
《中国材料进展》
2025年第9期828-834,共7页
Materials China
基金
国家自然科学基金面上项目(42372358)
国家重点研发计划项目(2021YFB3701804)
湖南省自然科学基金面上项目(2022JJ30709)。
关键词
熔融沉积成型与烧结
金属-金刚石复合材料
喷嘴
气体扩散通道
脱脂效果
均匀分布
fused deposition modeling and sintering
metal-diamond composite
nozzles
evaporation pathway
debinding efficiency
uniform dispersion
作者简介
第一作者:吴冬宇,男,1989年生,副教授,硕士生导师,Email:wdy6119631@csu.edu.cn。
