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Al2O3/TiO2复相陶瓷结构直接激光近净成形研究
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大连理工大学,大连理工大学,大连理工大学,大连理工大学,大连理工大学

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中图分类号:

TB332; TH145.9

基金项目:

国家自然科学基金资助(项目号No.51175061;No.51402037);创新研究团体科学基金资助(项目号No.51321004);国家重点基础研究发展计划(NO.2015CB057305)


Direct Laser Engineered Net Shaping of Al2O3/TiO2 Multiphase Ceramic Structures
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Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education,Dalian University of Technology,Dalian,Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education,Dalian University of Technology,Dalian,Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education,Dalian University of Technology,Dalian,Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education,Dalian University of Technology,Dalian,Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education,Dalian University of Technology,Dalian

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    摘要:

    直接激光近净成形陶瓷结构是一种利用高能激光束直接熔化陶瓷粉末,通过逐点沉积凝固成形三维实体陶瓷结构的增材制造技术。该技术无需掺杂粘结剂或助烧剂,将传统的成型与烧结工步合二为一,并省去了配料、干燥及排胶等步骤,能够实现高纯致密、形状复杂陶瓷零件的快速制备。本文利用激光近净成形系统进行了Al2O3/TiO2(13 wt.%)陶瓷结构的直接制备,对Al2O3/TiO2(13 wt.%)陶瓷结构的成形工艺进行了研究。利用XRD、SEM等手段对所制备样件的物相、微观组织及性能进行了分析。结果表明,直接激光近净成形的Al2O3/TiO2陶瓷的物相主要为Al2TiO5及Al2O3,沿沉积高度方向定向生长的Al2O3柱状晶粒分布于连续的Al2TiO5基体中。所制备的Al2O3/TiO2陶瓷由于其沉积过程中化学反应的存在而具有一定量的宏观气孔,但仍然具有21 GPa以上的显微硬度,抗弯强度达到170 MPa。该研究表明激光近净成形技术可以实现陶瓷材料的完全熔化-凝固成形,为直接快速制备高性能陶瓷结构提供了一种全新的选择。

    Abstract:

    The direct laser engineered net shaping ceramic structure is a kind of additive manufacturing technology which uses the high energy laser beam to directly melt ceramic powders and then the melted material deposites to form three dimensional parts. In this technology, doping binder or sintering agent is needless, traditional shaping and sintering steps will be made one. Furthermaore, this technology omits steps, mixing, drying and discharging, and can achieve complex ceramic parts of high-purity compact shape and preparation. In this paper, direct fabrication of Al2O3/TiO2(13 wt.%) ceramic structure is conducted by laser engineered net shaping system and the deposition process is studied. XRD and SEM are used to analyze the phase and microstructure. Results show that the main phases of fabricated specimens are Al2TiO5and Al2O3, and the Al2O3 columnar grains distributed in the Al2TiO5 matrix. Due to the presence of the chemical reaction in the process, the Al2O3/TiO2 ceramic has a certain amount of macro pores, but it still has a micro hardness of more than 21 GPa, and the bending strength is up to 170 MPa. The study shows that laser engineered net shaping technology can realize the complete melting and solidification of ceramic materials, and provides a new choice for direct and rapid fabrication of high performance ceramic structures.

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牛方勇,吴东江,闫帅,马广义,郭东明. Al2O3/TiO2复相陶瓷结构直接激光近净成形研究[J].稀有金属材料与工程,2018,47(S1):388~392.[Niu Fangyong, Wu Dongjiang, Yan Shuai, Ma Guangyi, Guo Dongming. Direct Laser Engineered Net Shaping of Al2O3/TiO2 Multiphase Ceramic Structures[J]. Rare Metal Materials and Engineering,2018,47(S1):388~392.]
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  • 收稿日期:2017-07-11
  • 最后修改日期:2017-07-11
  • 录用日期:2018-01-29
  • 在线发布日期: 2018-10-22
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