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颗粒级配对选区激光打印结合常压烧结制备碳化硅陶瓷性能的影响

王康龙1,2, 殷杰1, 陈晓1, 王力1, 刘学建1, 黄政仁1,3   

  1. 1.中国科学院 上海硅酸盐研究所, 上海 200050;
    2.湖南大学 材料科学与工程学院, 长沙 410000;
    3.中国科学院 宁波材料技术与工程研究所, 宁波 315201
  • 收稿日期:2023-12-18 修回日期:2024-02-17 接受日期:2024-02-17 出版日期:2024-02-22 网络出版日期:2024-02-22
  • 作者简介:王康龙(1999-), 男, 硕士研究生. E-mail: wangkanglong@hnu.edu.cn.
  • 基金资助:
    国家重点研发计划(2022YFB3706300),国家自然科学基金(U22A20129, 52073299,52172077)

Effect of Particle Grading on Properties of Silicon Carbide Ceramics by Selective Laser Printing Combined with Solid Phase Sintering at Atmospheric Pressure

WANG Kanglong1,2, YIN Jie1, CHEN Xiao1, Wang Li1, LIU Xuejian1, HUANG Zhengren1,3   

  1. 1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 2. College of Materials Science and Engineering, Hunan University, Changsha, 410082, China; 3 Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
  • Received:2023-12-18 Revised:2024-02-17 Accepted:2024-02-17 Published:2024-02-22 Online:2024-02-22
  • About author:WANG Kanglong (1999-), male, master candidate. E-mail: wangkanglong@hnu.edu.cn
  • Supported by:
    National Key R&D Program of China (2022YFB3706300); National Natural Science Foundation of China (U22A20129, 52073299, 52172077)

摘要: SiC陶瓷因其独特的热学、电学性能及优异的力学性能,被广泛应用于航空航天、核能、化工、半导体等国防与工业重大领域, 但是传统的成型方法无法满足大尺寸复杂构件的制备需求。选区激光3D打印(SLS)具有无需支撑、材料利用率高、加工效率高等优势,能高效成型复杂陶瓷结构零部件。本研究采用颗粒级配SiC的方法,系统研究了冷等静压(CIP)、前驱体浸渍热解(PIP)、CIP结合PIP后常压固相烧结等工艺对级配和中位径82 μm未级配体系SiC陶瓷的影响。研究发现,级配粉末成型坯体的体积密度和抗弯强度比未级配坯体均提升了20%以上,级配体系CIP后常压固相烧结体的相对致密度达到了90%以上,实现了致密化烧结,而未级配体系烧结体的相对致密度仅为89%,这是由于颗粒级配后坯体的堆积密度提升所致,且级配烧结体的抗弯强度(136.8 MPa)比未级配(99.4 MPa)提升了37%以上。采用多次重复PIP结合常压固相烧结的方法制备高致密的SiC陶瓷,发现SLS成型的坯体PIP四次后致密度可达到CIP堆积致密的效果,但PIP四次后常压固相烧结体的密度仅为2.29 g/cm3,抗弯强度59.6MPa。

关键词: 碳化硅陶瓷, 颗粒级配, 选区激光打印, 常压固相烧结

Abstract: Silicon Carbide(SiC) ceramics are widely utilized in critical industries such as aerospace, nuclear energy, chemical processing, semiconductor manufacturing due to their unique thermal and electrical properties coupled with excellent mechanical properties. Nevertheless, conventional forming methods often fall short when it comes to producing large-sized and complex components. Selective laser printing (SLS) has the advantages of no support, high material utilization, high processing efficiency, etc., making it suitable for the precise fabrication of shape complex ceramic structural components. In this study, the particle grading approach was employed to systematically investigate the impacts of processes such as cold isostatic pressing (CIP), precursor impregnation pyrolysis (PIP), and the combination of CIP with PIP followed by pressureless solid-phase sintering. The results revealed that the use of graded powders significantly enhanced both the bulk density and the flexural strength of the formed bodies by over 20% compared to non-graded systems. The relative density of the graded system after CIP and subsequent pressureless solid-phase sintering is over 90%, confirming successful densification during sintering. In contrast,the non-graded sintered bodies only achieved a density of 89%. The implementation of particle grading led to an increase in bulk density, which was beneficial for achieving higher densification during sintering. Consequently, the flexural strength of the graded sintered body was significantly improved, reaching 136.8 MPa—a gain of over 37% compared to the non-graded counterpart, which had a strength of 99.4 MPa. High-density SiC ceramics were achieved by repeating PIP combined with solid-phase sintering. It was observed that after four PIP cycles, the density of PIP bodies was comparable to that of CIP compacts. However, the density of solid-phase sintered bodies after four PIP cycles were only 2.29 g/cm3, which was accompanied by a flexural strength of 59.6 MPa.

Key words: SiC ceramics, particle grading, selective laser printing, solid-phase sintering

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