纳米级Al_2O_3/Ni基高温合金复合粉末的制备及激光3D打印研究
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摘要
通过超声分散-高速搅拌两步法,以聚乙二醇为分散剂和粘接剂将纳米级Al_2O_3陶瓷颗粒组装至Ni基高温合金球形颗粒表面,制备了Al_2O_3/Ni基高温合金复合粉末,并进行激光3D打印制备Al_2O_3/Ni基高温合金成型试样。结果表明:采用超声分散-高速搅拌两步法成功制备了可用于激光3D打印技术的复合粉末。在进行激光3D打印后,成型试样的显微组织主要表现为柱状晶和等轴晶组织,均匀细小,排列紧密,纳米级Al_2O_3颗粒均匀分布在基体中。显微硬度(HV)平均可达405.81。
Using polyethylene glycol as dispersants and adhesives,nano-sized Al_2O_3 ceramic particles were assembled to the surface of Ni-based superalloy spherical particle to prepare Al_2O_3/Ni-based superalloy powder by the two steps method of ultrasonic dispersion and high speed stirring.Molding Al_2O_3/Ni-based superalloy composites were prepared by the laser 3 D printing.The results show that the composite powder used for laser 3 D printing technology can be successfully prepared by two steps process of ultrasonic dispersion and high speed stirring.After laser 3 D printing,the microstructure of molding materials is mainly represented by the columnar crystal and isometric crystal structure,uniform and compact,the nano-Al_2O_(3 )granules are uniformly distributed in the matrix.The microhardness(HV) of the composites can reach to 405.81.
Using polyethylene glycol as dispersants and adhesives,nano-sized Al_2O_3 ceramic particles were assembled to the surface of Ni-based superalloy spherical particle to prepare Al_2O_3/Ni-based superalloy powder by the two steps method of ultrasonic dispersion and high speed stirring.Molding Al_2O_3/Ni-based superalloy composites were prepared by the laser 3 D printing.The results show that the composite powder used for laser 3 D printing technology can be successfully prepared by two steps process of ultrasonic dispersion and high speed stirring.After laser 3 D printing,the microstructure of molding materials is mainly represented by the columnar crystal and isometric crystal structure,uniform and compact,the nano-Al_2O_(3 )granules are uniformly distributed in the matrix.The microhardness(HV) of the composites can reach to 405.81.
引文
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[2] 于秀平,沈以赴,顾冬冬.激光烧结法制备原位增强型多孔镍基复合材料[J].稀有金属与硬质合金,2009,37(4):11-14.
[3] COOPER D E,BLUNDELL N,MAGGS S,et al.Additive layer manufacture of Inconel 625 metal matrix composites,reinforcement material evaluation[J].Journal of Materials Processing Technology,2013,213(12):2 191-2 200.
[4] 姜华,汤海波,王华明.激光熔化沉积DZ408镍基高温合金的组织研究[J].稀有金属与硬质合金,2014,42(1):46-51.
[5] WEN Z X,YUE Z F.Fracture behaviour of the compact tension specimens of nickel-based single crystal superalloys at high temperatures[J].Materials Science & Engineering A,2007,456(1-2):189-201.
[6] AND P S G,BENJAMIN J S.Mechanical alloying[J].Annual Review of Materials Research,2003,39(13):279-300.
[7] RONG T,GU D D.Formation of novel graded interface and its function on mechanical properties of WC1-x,reinforced Inconel 718 composites processed by selective laser melting[J].Journal of Alloys & Compounds,2016,680:333-342.
[8] 覃思思,余勇,曾归余,等.3D打印用金属粉末的制备研究[J].粉末冶金工业,2016,26(5):21-24.
[9] MAEDA K,CHILDS T H C.Laser sintering (SLS) of hard metal powders for abrasion resistant coatings[J].Journal of Materials Processing Technology,2004,149(1-3):609-615.
[10] 张升,桂睿智,魏青松,等.选择性激光熔化成形TC4钛合金开裂行为及其机理研究[J].机械工程学报,2013,49(23):21-27.
[11] 闫岸如,杨恬恬,王燕灵,等.选区激光熔化不同层厚镍的热特性与机械性能[J].中国激光,2016(2):68-76.