Preparation of SiC ceramics by reaction sintering and their performance

doi:10.3969/j.issn.1001-1935.2022.02.011

Abstract

Abstract:

Fine powder silicon carbide ceramics were prepared by reaction sintering using SiC powders(d₅₀=3.6 μm,SiC≥98 mass%) as the main raw material,added with carbon black,graphite,water reducing agent and dispersing medium,well mixed,slip cast,dried at 80 ℃ and reaction sintered at 1 720 ℃.Effects of the stirring time (1-5 h) and the carbon black addition (5.62%-6.93%,by mass) on properties of green bodies were researched,and the microstructure of the green bodies and the fired specimens was researched.The results show that the physical properties of the product added with graphite are improved obviously,the optimal addition of carbon black is 5.94%,the maximum bulk density of the sintered specimen is 3.02 g·cm^-3,and the bending strength can reach 580 MPa.

Key words: silicon carbide ceramics, slipping casting, reaction sintering, microstructure

摘要：

以全细粉碳化硅(d₅₀=3.6 μm、w(SiC)≥98%)为主要原料,加入炭黑、石墨、减水剂和分散介质等混合均匀后注浆成型,80 ℃烘干并于1 720 ℃反应烧结制备全细粉碳化硅陶瓷材料。考察了搅拌时间1~5 h、炭黑加入质量分数5.62%~6.93%对素坯性能的影响,并对素坯及烧后试样微观结构进行表征。结果表明:添加石墨所得试样的物理性能明显改善,炭黑的最佳添加量为5.94%(w),烧后试样的体积密度最大为3.02 g·cm^-3,抗弯强度可达580 MPa。

关键词: 碳化硅陶瓷, 注浆成型, 反应烧结, 微观结构

CLC Number:

TQ174

He Guoxu, Cao Cexiang, Han Yong-jun, Tian Gang, Li Weili, Wu Huatao. Preparation of SiC ceramics by reaction sintering and their performance[J]. Refractories, 2022, 56(2): 146-149.

贺国旭, 曹测祥, 韩永军, 田刚, 李伟利, 吴华涛. 反应烧结制备碳化硅陶瓷及其性能研究[J]. 耐火材料, 2022, 56(2): 146-149.

Figures/Tables 8

Table 1 Formulations

原料	w/%
原料	1^#试样	2^#试样	3^#试样	4^#试样	5^#试样	6^#试样
碳化硅	88.41	88.11	87.80	87.49	87.18	92.78
石墨	5.05	5.03	5.02	5.00	4.98	0
炭黑	5.62	5.94	6.27	6.60	6.93	6.26
K90	0.76	0.76	0.75	0.75	0.75	0.80
K30	0.06	0.06	0.06	0.06	0.06	0.06
CE-64	0.06	0.06	0.06	0.06	0.06	0.06
AO	0.04	0.04	0.04	0.04	0.04	0.04

Fig.1 Relationship between stirring time and viscosity of specimen 2#

Fig.2 Relationship between stirring time and bulk density/porosity of green bodies of specimen 2#

Table 2 Slurry viscosity,bulk density and porosity of green bodies before and after adding graphite

项目	2^#试样	6^#试样
黏度/(mPa·s)	721	993
体积密度/(g·cm^-3)	1.47	1.21
显气孔率/%	32.4	44.4

Fig.3 Bulk density and porosity of different green bodies

Fig.4 XRD patterns of specimen 2# before and after sintering and powder embedding

Fig.5 Fracture morphology of different green bodies

Fig.6 Fracture morphology of sintered specimen 2#

References 14

[1]	ZABELINA A A, SHCHERBAKOVA G I, FAIKOV P P, et al. SiC composites containing carbon nanotubes and oxide additives based on organoelementoxanes.preparation by spark plasma sintering[J]. Ceramics International, 2020, 46(3):2786-2791. DOI URL
[2]	昝文宇, 马北越. 高纯SiC微粉制备进展[J]. 耐火材料, 2021, 55(2):161-168.
[3]	刘元军, 赵晓明, 拓晓. 石墨/碳化硅/铁氧体涂层复合材料性能研究[J]. 材料科学与工艺, 2016, 24(1):90-96.
[4]	艾俊迪, 余超, 董博, 等. 添加Al粉对反应烧结碳化硅性能和结构的影响[J]. 耐火材料, 2021, 55(1):51-55.
[5]	李可琢, 张海军, 苑高千, 等. 聚碳硅烷制备SiC陶瓷研究进展[J]. 耐火材料, 2020, 54(3):260-265.
[6]	李辰冉, 谢志鹏, 赵林. 碳化硅陶瓷材料烧结技术的研究与应用进展[J]. 陶瓷学报, 2020, 41(2):137-149.
[7]	宋索成, 鲍崇高, 陈子晗, 等. 碳纤维改性反应烧结碳化硅陶瓷组织及力学性能[J]. 西安交通大学学报, 2017, 51(4):67-71+108.
[8]	韩永军, 李青彬, 燕青芝, 等. 反应烧结制备碳化硅增强石墨复合材料及其性能[J]. 新型炭材料, 2015, 30(1):92-96.
[9]	陆有军. 碳纳米颗粒改性碳化硅陶瓷基复合材料的制备及其性能研究[D]. 广州: 华南理工大学, 2014.
[10]	胡海龙, 姚冬旭, 夏咏锋, 等. 反应烧结制备Si₃N₄/SiC复相陶瓷及其力学性能研究[J]. 无机材料学报, 2014, 29(6):594-598. DOI
[11]	魏红康, 邓翔宇, 汪长安, 等. 反应热压烧结制备SiC/ZrB₂复相陶瓷及其性能表征[J]. 人工晶体学报, 2014, 43(3):550-554.
[12]	桑可正, 金志浩. 反应烧结碳化硅复合材料的磨损机理研究[J]. 摩擦学学报, 2000, 20(5):352-355.
[13]	胡传奇, 刘海林, 黄小婷, 等. 反应烧结碳化硅的显微结构和力学性能分析[J]. 中国陶瓷工业, 2020, 27(5):7-11.
[14]	郝寅雷, 赵文兴. 反应烧结碳化硅陶瓷的制备及烧结机理[J]. 耐火材料, 2000, 34(6):313-315.

[1]	Yao Luyan, Han Bingqiang, Zhang Jinhua, Ke Changming. Effect of Ti-Si-Fe alloy addition on structure and properties of Si₃N₄ bonded SiC refractories [J]. Refractories, 2024, 58(4): 277-283.
[2]	Li Wenfeng, Shen Tianzi, Guo Huishi, Cao Jinjin, Kang Xiaoxu, Shi Kai, Kang Xiaoyang. Influence of polyhydroxy saccharide binders on properties of Al₂O₃-SiC-C waterless taphole clay [J]. Refractories, 2024, 58(4): 314-318.
[3]	An Jiarui, Zhang Rui, Fan Bingbing, Wang Gang, Du Penghui. Effects of Sm₂O₃ addition and heat treatment temperature on properties of CA₆-MA materials [J]. Refractories, 2024, 58(4): 319-322.
[4]	Gao Yunqin, Guo Kaige, Ma Aiqiong, Niu Xingrong, Yang Guang, Zhang Xudong. Preparation and alkali corrosion resistance of mullite-corundum-magnesium aluminate spinel multiphase materials [J]. Refractories, 2024, 58(4): 334-340.
[5]	Guan Yunhe, Zheng Lijun, Luo Xudong, Niu Shunan. Preparation and properties of porous silicon carbide ceramic materials from iron tailings [J]. Refractories, 2024, 58(3): 246-250.
[6]	Deng Chengji, He Feng, Liang Yiming, Li Ji, Gao Chao, Mu Meng. Influence of TiO₂ addition on phase composition and properties of porous SiC ceramics [J]. Refractories, 2024, 58(2): 93-98.
[7]	Liang Baoqing, Zhang Zhifeng, Wang Quanxi, Shang Junli, Li Hongyu, Zhao Chenrui, Zhao Yue. Effects of SiC polymer precursor and Zn composite powders on properties of Al₂O₃-C unfired slide plate materials [J]. Refractories, 2024, 58(2): 137-142.
[8]	Piao Jiasi, Du Qingyang, Tang Yudong, Bai Jiahai. Effect of light burnt MgO powder on properties of porous MgAl₂O₄ ceramics by gel-casting route [J]. Refractories, 2024, 58(1): 40-43.
[9]	Liu Zhiyun, Jia Shuo, Lu Yiguo. Research of used silica bricks for coke oven carbonization chambers [J]. Refractories, 2024, 58(1): 57-62.
[10]	Su Yuzhu, Luo Huaming, Wang Hanyu, Fan Mingming, Jin Yi, Zhan Huasheng. Performance analysis of bauxite-based mullite [J]. Refractories, 2024, 58(1): 76-79.
[11]	Piao Jiasi, Du Qing-yang, Bai Jiahai. Preparation of porous MgAl₂O₄ ceramics by dry pressing-solid phase reaction route [J]. Refractories, 2023, 57(6): 500-503.
[12]	Sun Honggang, Li Hongxia, Si Yaochen, Du Yihao, Zhao Shixian, Shang Xinlian, Xia Miao. Effect of heat treatment temperature on properties of SiC-MgAl₂O₄-Al composites [J]. Refractories, 2023, 57(5): 390-396.
[13]	Chang Cheng, Lyu Chunjiang, Gong Jianfeng, Huang Yifei, Ma Zhaoyang, Liu Zhen. Effect of industrial carbon black addition on properties of multiphase bonded silicon carbide refractories [J]. Refractories, 2023, 57(5): 412-416.
[14]	Cao Huiyan, Wan Longgang, Wang Jianbo, Liu Yun, Zheng Han, Zhang Xinhua, Feng Yanbin, Wu Jiguang. Oxidation of recrystallized SiC in 1 000 ℃ saturated steam [J]. Refractories, 2023, 57(5): 423-426.
[15]	Guo Huishi, Yang Jialin, Li Wenfeng, Gui Yanghai, Zhao Zhiqiang, Liu Yingfan. Effects of Al₂O₃-SiO₂ raw material types on properties of anorthite based insulation refractories [J]. Refractories, 2023, 57(4): 286-290.