Molten Salt Assisted Synthesis of Dy3Si2C2 Coated SiC Powders and Sintering Behavior of SiC Ceramics

doi:10.15541/jim20200068

Abstract

Abstract:

Silicon carbide is widely used because of its excellent physical and chemical properties. The chemical bonding characteristics of SiC make it difficult to be sintered. Therefore, preparation of high-quality SiC ceramics is one of the challenges in SiC research field. In this study, the ternary rare-earth carbide Dy₃Si₂C₂ was proposed as a new sintering additive for SiC ceramics, through the phase transition of Dy-Si-C system at high temperatures to promote the densification of SiC. The Dy₃Si₂C₂ coated SiC powders were synthesized via an in-situ reaction between metal Dy and SiC in high temperature molten salts. The Dy₃Si₂C₂ coated SiC powder was sintered by spark plasma sintering (SPS), at 1800 ℃, 45 MPa. As the result, high-purity SiC ceramic with the density of 99% and thermal conductivity of 162.8 W·m ^-1·K ^-1was obtained to form the SiC-Dy₃Si₂C₂raw material with n(Dy) : n(SiC)=1 : 4. Further study shows that Dy₃Si₂C₂ and SiC undergo a eutectic reaction at high temperatures, which generates liquid phase at the grain boundaries and promotes the densification of SiC ceramics. This study shows that the ternary rare-earth carbides Re₃Si₂C₂ (Re=La, Ce…) has great potential to be used as the sintering additive for SiC.

Key words: SiC, Dy₃Si₂C₂, spark plasma sintering, molten salt

CLC Number:

TQ174

WAN Peng, LI Mian, HUANG Qing. Molten Salt Assisted Synthesis of Dy₃Si₂C₂ Coated SiC Powders and Sintering Behavior of SiC Ceramics[J]. Journal of Inorganic Materials, 2021, 36(1): 49-54.

Figures/Tables 5

Fig. 1 (a) XRD patterns of the SiC and SiC-Dy3Si2C2 raw materials prepared with different molar ratios, SEM images of (b) SiC and (c) SiC-Dy3Si2C2

Fig. 2 (a) XRD and (b-f) SEM images of sintered pure SiC ceramics and SiC ceramics sintered from SiC-Dy3Si2C2 raw materials with different molar ratios (b) SiC; (c) n(Dy) : n(SiC) =1 : 8, 1800 ℃; (d) n(Dy) : n(SiC) =1 : 6, 1800℃; (e) n(Dy) : n(SiC)=1 : 4, 1800 ℃; (f) n(Dy) : n(SiC)=1 : 4, 1700 ℃

Fig. 3 (a) TEM image and (b) EDS analysis of SiC ceramics sintered from raw materials with ratio of n(Dy) : n(SiC)=1 : 4; (c) HR-TEM of the marked area 1 in (a); (d) HR-TEM image of the marked area 2 in (a)

Fig. 4 Displacement curves of piston on the SiC ceramic during the SPS sintering

Table 1 Parameters of density and thermal properties of sintered SiC ceramics

Specimen	Density /(g·cm^-3)	Heat capacity /(J·g^-1·K^-1)	Thermal diffusion /(mm²·s^-1)	Phonon mean free path/nm	Thermal conductivity /(W·m^-1·K^-1)
n(Dy) : n(SiC)=1 : 8(1800 ℃)	3.321	0.649	54.3	13.8	117.1
n(Dy) : n(SiC)=1 : 6(1800 ℃)	3.589	0.533	52.1	13.2	99.8
n(Dy) : n(SiC)=1 : 4(1800 ℃)	3.228	0.683	73.8	18.7	162.8
n(Dy) : n(SiC)=1 : 4(1700 ℃)	3.306	0.648	58.0	16.5	124.3

References 17

[1]	EOM J H, SEO Y K, KIM Y W . Mechanical and thermal properties of pressureless sintered silicon carbide ceramics with alumina-yttria-calcia. Journal of the American Ceramic Society, 2016,99(5):1735-1741.
[2]	YUAN R, KRUZIC J J, ZHANG X F , et al. Ambient to high-temperature fracture toughness and cyclic fatigue. Acta Materialia, 2003,51(20):6477-6491.
[3]	ZHAN G D, MITOMO M, XIE R J , et al. Thermal and electrical properties in plasma-activation-sintered silicon carbide with rare-earth-oxide additives. Journal of the American Ceramic Society, 2001,84(10):2448-2450.
[4]	RODRíGUEZ R F, ORTIZ A, GUIBERTEAU F , et al. Anomalous oxidation behaviour of pressureless liquid-phase-sintered SiC. Journal of the European Ceramic Society, 2011,31(13):2393-2400.
[5]	LI M, ZHOU X B, YANG H , et al. The critical issues of SiC materials for future nuclear systems. Scripta Materialia, 2018,143:149-153.
[6]	SCITI D, BELLOS A . Effects of additives on densification, microstructure and properties of liquid-phase sintered silicon carbide. Journal of Materials Science, 2000,35:3849-3855.
[7]	王静, 张玉军, 龚红宇 . 无压烧结碳化硅研究进展. 陶瓷, 2008(4):17-19.
[8]	LIN B W, IMAI M, YANO T , et al. Hot-pressing of β-SiC powder with Al-B-C additives. Journal of the American Ceramic Society, 1986, 69(4): C-67-C-68.
[9]	MAGNANI G, BELTRAMI G, MINOCCARI G L , et al. Pressureless sintering and properties of α-SiC-B₄C composite. Journal of the European Ceramic Society, 2001,21(5):633-638.
[10]	ZHOU Y, HIRAO K, YAMAUCHI Y , et al. Effects of rare-earth oxide and alumina additives on thermal conductivity of liquid-phase-sintered silicon carbide. Journal of Materials Research, 2003,18(8):1854-1862.
[11]	CHO T Y, KIM Y W . Effect of grain growth on the thermal conductivity of liquid-phase sintered silicon carbide ceramics. Journal of the European Ceramic Society, 2017,37(11):3475-3481.
[12]	SHAO J Q, LI M, CHANG K K , et al. Fabrication and characterization of SPS sintered SiC-based ceramic from Y₃Si₂C₂-coated SiC powders. Journal of the European Ceramic Society, 2018,38(15):4833-4841.
[13]	WAN P, LI M, XU K , et al. Seamless joining of silicon carbide ceramics through an sacrificial interlayer of Dy₃Si₂C₂. Journal of the European Ceramic Society, 2019,39(16):5457-5462.
[14]	LI M, CHEN F Y, SI X Y , et al. Copper-SiC whiskers composites with interface optimized by Ti₃SiC₂. Journal of Materials Science, 2018,53(13):9809-9815.
[15]	YE J K, ZHANG S W, LEE W E . Novel low temperature synthesis and characterisation of hollow silicon carbide spheres. Microporous and Mesoporous Materials, 2012,152:25-30.
[16]	YE J K, ZHANG S W, LEE W E . Molten salt synthesis and characterization of SiC coated carbon black particles for refractory castable applications. Journal of the European Ceramic Society, 2013,33(10):2023-2029.
[17]	SNEAD L L, NOZAWA T, KATOH Y , et al. Handbook of SiC properties for fuel performance modeling. Journal of Nuclear Materials, 2007,371(1/2/3):329-377.

Molten Salt Assisted Synthesis of Dy₃Si₂C₂ Coated SiC Powders and Sintering Behavior of SiC Ceramics

RichHTML

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

Figures/Tables 5

References 17

Related Articles 15

Recommended Articles

Metrics

Comments

[1]	WU Shuang, GOU Yanzi, WANG Yongshou, SONG Quzhi, ZHANG Qingyu, WANG Yingde. Effect of Heat Treatment on Composition, Microstructure and Mechanical Property of Domestic KD-SA SiC Fibers [J]. Journal of Inorganic Materials, 2023, 38(5): 569-576.
[2]	ZHANG Shuo, FU Qiangang, ZHANG Pei, FEI Jie, LI Wei. Influence of High Temperature Treatment of C/C Porous Preform on Friction and Wear Behavior of C/C-SiC Composites [J]. Journal of Inorganic Materials, 2023, 38(5): 561-568.
[3]	JING Kaikai, GUAN Haoyang, ZHU Siyu, ZHANG Chao, LIU Yongsheng, WANG Bo, WANG Jing, LI Mei, ZHANG Chengyu. Tensile Creep Behavior of Cansas-II SiC_f/SiC Composites at High Temperatures [J]. Journal of Inorganic Materials, 2023, 38(2): 177-183.
[4]	SHENG Lili, CHANG Jiang. Photo/Magnetic Thermal Fe₂SiO₄/Fe₃O₄ Biphasic Bioceramic and Its Composite Electrospun Membrane: Preparation and Antibacterial [J]. Journal of Inorganic Materials, 2022, 37(9): 983-990.
[5]	HU Jiajun, WANG Kai, HOU Xinguang, YANG Ting, XIA Hongyan. Boron Phosphide with High Thermal Conductivity: Synthesis by Molten Salt Method and Thermal Management Performance [J]. Journal of Inorganic Materials, 2022, 37(9): 933-940.
[6]	XU Puhao, ZHANG Xiangzhao, LIU Guiwu, ZHANG Mingfen, GUI Xinyi, QIAO Guanjun. Microstructure and Mechanical Properties of SiC Joint Brazed by Al-Ti Alloys as Filler Metal [J]. Journal of Inorganic Materials, 2022, 37(6): 683-690.
[7]	ZHANG Ye, YAO Dongxu, ZUO Kaihui, XIA Yongfeng, YIN Jinwei, ZENG Yuping. Combustion Synthesis of Si₃N₄-BN-SiC Composites by in-situ Introduction of BN and SiC [J]. Journal of Inorganic Materials, 2022, 37(5): 574-578.
[8]	RUAN Jing, YANG Jinshan, YAN Jingyi, YOU Xiao, WANG Mengmeng, HU Jianbao, ZHANG Xiangyu, DING Yusheng, DONG Shaoming. Electromagnetic Interference Shielding Properties of SiC Ceramic Matrix Composite Reinforced by Three-dimensional Silicon Carbide Nanowire Network [J]. Journal of Inorganic Materials, 2022, 37(5): 579-584.
[9]	WANG Hongda, FENG Qian, YOU Xiao, ZHOU Haijun, HU Jianbao, KAN Yanmei, CHEN Xiaowu, DONG Shaoming. Microstructure and Corrosion Behavior of Brazed Joints of SiC/SiC Composites and Hastelloy N Alloy Using Cu-Ni Alloy [J]. Journal of Inorganic Materials, 2022, 37(4): 452-458.
[10]	RUAN Jing, YANG Jinshan, YAN Jingyi, YOU Xiao, WANG Mengmeng, HU Jianbao, ZHANG Xiangyu, DING Yusheng, DONG Shaoming. Porous SiC Ceramic Matrix Composite Reinforced by SiC Nanowires with High Strength and Low Thermal Conductivity [J]. Journal of Inorganic Materials, 2022, 37(4): 459-466.
[11]	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.
[12]	WU Xishi, ZHU Yunzhou, HUANG Qing, HUANG Zhengren. Effect of Pore Structure of Organic Resin-based Porous Carbon on Joining Properties of C_f/SiC Composites [J]. Journal of Inorganic Materials, 2022, 37(12): 1275-1280.
[13]	LIU Pingping, ZHONG Xin, ZHANG Le, LI Hong, NIU Yaran, ZHANG Xiangyu, LI Qilian, ZHENG Xuebin. Molten Salt Corrosion Behaviors and Mechanisms of Ytterbium Silicate Environmental Barrier Coating [J]. Journal of Inorganic Materials, 2022, 37(12): 1267-1274.
[14]	SHU Chaoqin, ZHU Min, ZHU Yufang. Cobalt-incorporated Chlorapatite: Preparation by Molten Salt Method, Anti-oxidation and Cytocompatibility [J]. Journal of Inorganic Materials, 2022, 37(11): 1225-1235.
[15]	WU Aijun, ZHU Min, ZHU Yufang. Copper-incorporated Calcium Silicate Nanorods Composite Hydrogels for Tumor Therapy and Skin Wound Healing [J]. Journal of Inorganic Materials, 2022, 37(11): 1203-1216.