低黏结剂含量SiC素坯的选区激光烧结

doi:10.15541/jim20210699

无机材料学报 ›› 2022, Vol. 37 ›› Issue (3): 347-352.DOI: 10.15541/jim20210699

低黏结剂含量SiC素坯的选区激光烧结

黄龙之¹^,²(), 殷杰¹^,²(), 陈晓¹^,², 王新广³, 刘学建¹(), 黄政仁¹^,⁴

1.中国科学院上海硅酸盐研究所, 上海 200050
2.中国科学院大学材料科学与光电技术学院, 北京 100864
3.中国科学院金属研究所, 沈阳 110016
4.中国科学院宁波材料技术与工程研究所, 宁波 315201

收稿日期:2021-11-11 修回日期:2021-12-27 出版日期:2022-03-20 网络出版日期:2022-03-07
通讯作者: 殷杰, 副研究员. E-mail: jieyin@mail.sic.ac.cn; 刘学建, 研究员. E-mail: xjliu@mail.sic.ac.cn
作者简介:黄龙之(1996-), 男, 硕士研究生. E-mail: sichlz@163.com

Selective Laser Sintering of SiC Green Body with Low Binder Content

HUANG Longzhi¹^,²(), YIN Jie¹^,²(), CHEN Xiao¹^,², WANG Xinguang³, LIU Xuejian¹(), HUANG Zhengren¹^,⁴

1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
2. College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100864, China
3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
4. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

Received:2021-11-11 Revised:2021-12-27 Published:2022-03-20 Online:2022-03-07
Contact: YIN Jie, associate professor. E-mail: jieyin@mail.sic.ac.cn; LIU Xuejian, professor. E-mail: xjliu@mail.sic.ac.cn
About author:HUANG Longzhi (1996-), male, Master candidate. E-mail: sichlz@163.com
Supported by:
National Natural Science Foundation of China(52073299);National Natural Science Foundation of China(52172077);National Natural Science Foundation of China(51602325);National Natural Science Foundation of China(91960102);Youth Innovation Promotion Association, Chinese Academy of Sciences(2018289)

摘要/Abstract

摘要：

Al/SiC是SiC基复合材料, 具有优异的力学性能和热学性能, 在大功率电子器件、5G基站关键冷却组件、电动汽车、高速刹车片、空间探测器操作装置等相关领域具有不可替代的作用。传统制备工艺的局限性使得近净成形的无压浸渗法成为制备Al/SiC复合材料的一种较好的方法。得到高质量的碳化硅(SiC)陶瓷素坯是熔渗技术的先决条件, 选区激光烧结技术是获得高质量陶瓷素坯的一种新方法。该方法具有快速、高效的优点, 无需模具即可成型制备大规模、复杂形状部件。本研究以热塑性酚醛树脂为黏结剂, 利用机械混合与喷雾造粒的方法制备了复合粉体, 采用选区激光烧结技术制备SiC素坯, 制备了黏结剂体积分数低至15%的样品, 并对其力学性能和微观结构进行表征。当树脂含量增大到体积分数25%时, SiC坯体的强度增量为702.1%。对于喷雾造粒粉体制备的样品而言, 喷雾干粉的多孔结构使得SiC生坯的孔隙率较高(71.18%), 导致生坯强度下降。

关键词: Al/SiC, 选区激光烧结, 素坯, 微结构

Abstract:

Belonging to the family of SiC-based composites, Al/SiC has excellent mechanical and thermal properties, making it irreplaceable in high-power electronic devices, key cooling components of 5G base station, electric vehicles, high-speed brake pads, space probe operation devices, and other related fields featured by high technologies. The melt infiltration method, which can achieve near-net forming, has been recognized to be a favorable method for preparing Al/SiC composites to overcome the disadvantages of traditional processing. How to obtain a high-quality silicon carbide (SiC) ceramic green body is a key for the perfect melt infiltration method. Selective laser sintering (SLS) technology provides a new opportunity for a top grade ceramic forming process, which is rapid and efficient in realizing large-scale and complicated-shape without cast molding. Here, the SiC green body was obtained by SLS technique with thermoplastic phenolic resin as binder and its content lower than 15% (in volume) for the subsequent procedure to fabricate composite materials. However, low binder content results in low flexural strength. As the resin content increases to 25% (in volume), the strength of the SiC green body reaches 3.77 MPa with a strength increment of 702.1% for the SLS SiC green body. Spray drying was applied to form more spherical powder. Nevertheless, the porosity of the SiC green body is still high (71.18%), due to porous microstructure remaining in spray-dried powder, which leads to deteriorated strength of the green body.

Key words: Al/SiC, selective laser sintering, green body, microstructure

中图分类号:

TQ174

黄龙之, 殷杰, 陈晓, 王新广, 刘学建, 黄政仁. 低黏结剂含量SiC素坯的选区激光烧结[J]. 无机材料学报, 2022, 37(3): 347-352.

HUANG Longzhi, YIN Jie, CHEN Xiao, WANG Xinguang, LIU Xuejian, HUANG Zhengren. Selective Laser Sintering of SiC Green Body with Low Binder Content[J]. Journal of Inorganic Materials, 2022, 37(3): 347-352.

图/表 5

Fig. 1 SEM images and particle size distributions of powder and particles (a) SEM image of raw SiC particles; (b) SEM image of raw phenolic resin particles; (c) SEM image of a single granulated ball; (d) SEM image of GP; (e) Particle size distributions of raw SiC powder and granulated powder

Fig. 2 Thermal analyses of resin and GP (a) TG-DTA curves of granulated powder; (b) TG-DTA curves of phenolic resin

Fig. 3 Photos of RP25 samples prepared by SLS, the bulk density and open porosity of different SiC green bodies, and the pore size distribution of GP and RP25 green body with the same binder content (a) Digital images of RP25 samples prepared by SLS, print part (left), green body (right); (b) Influence of different samples on the bulk density and open porosity; (c) Pore size distribution of the green body formed by RP25 and GP

Fig. 4 SEM images of fracture surfaces and bending strength of different samples (a) RP15; (b) RP20; (c) RP25; (d, e) GP; (f) Bending strength of different green body

Fig. 5 Bonding principle of SiC particles and residual C Blue irregular block: SiC particles; Yellow block: C

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低黏结剂含量SiC素坯的选区激光烧结

Selective Laser Sintering of SiC Green Body with Low Binder Content

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