颗粒级配对固相烧结碳化硅陶瓷的影响

doi:10.15541/jim20180072

无机材料学报 ›› 2018, Vol. 33 ›› Issue (11): 1167-1172.DOI: 10.15541/jim20180072 CSTR: 32189.14.10.15541/jim20180072

颗粒级配对固相烧结碳化硅陶瓷的影响

邢媛媛^1,2, 吴海波², 刘学建², 黄政仁²

1. 中国科学院大学, 北京100049;
2. 中国科学院上海硅酸盐研究所, 高性能陶瓷和超微结构国家重点实验室, 上海200050

收稿日期:2018-02-08 修回日期:2018-06-12 出版日期:2018-11-16 网络出版日期:2018-10-20
作者简介:刑媛媛(1991-), 女, 硕士研究生. E-mail: xingyuanyuan@student.sic.ac.cn
基金资助:
国家重点研发计划(2017YFB0306400);上海市青年科技英才扬帆计划(17YF1421600);太仓市大院大所创新引领专项计划(TC2017DYDS24);中国科学院上海硅酸盐研究所所创新重点项目(Y62ZC2120G)

Grain Composition on Solid-state-sintered SiC Ceramics

XING Yuan-Yuan^1,2, WU Hai-Bo², LIU Xue-Jian², HUANG Zheng-Ren²

1. University of Chinese Academy of Sciences, Beijing 100049, China;
2. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Received:2018-02-08 Revised:2018-06-12 Published:2018-11-16 Online:2018-10-20
About author:XING Yuan-Yuan. E-mail: xingyuanyuan@student.sic.ac.cn

摘要/Abstract

摘要：

通过粗细碳化硅粉体的颗粒级配实现了致密固相烧结碳化硅(S-SiC)陶瓷的增强增韧, 系统研究了粗粉(~4.6 µm)加入量对烧结试样的致密化、微结构与力学特性的影响。结果表明: 当粗粉加入量不超过75wt%时, 可制备出相对密度≥98.3%的致密S-SiC陶瓷, 烧结收缩率低至14.5%;引入的粗粉颗粒产生钉扎作用, 显著抑制了S-SiC陶瓷中异常晶粒生长, 形成细小的等轴晶粒, 进而提高了S-SiC陶瓷的抗弯强度。同时, 粗粉颗粒的引入导致S-SiC陶瓷的断裂方式由穿晶断裂转变为穿晶-沿晶复合断裂, 使得S-SiC陶瓷的断裂韧性增强。对于粗粉引入量为65wt%的S-SiC陶瓷, 抗弯强度与断裂韧性分别为(440±35) MPa与(4.92±0.24) MPa•m^1/2, 相比于未添加粗粉的S-SiC陶瓷, 分别提升了14.0%与17.1%。

关键词: 固相烧结碳化硅, 颗粒级配, 微结构, 抗弯强度, 断裂韧性

Abstract:

Strengthening and toughening of dense solid-state-sintered SiC (S-SiC) ceramics was achieved by grain composition of coarse and fine SiC powder, whose median particle sizes were ~4.6 μm and ~0.5 μm, respectively. The fraction effects of coarse SiC powder on densification, microstructures, and mechanical properties of S-SiC ceramics were systematically investigated. High relative densities (higher than 98.3%) were successfully acquired for the S-SiC samples with the fraction of coarse powder less than 75wt%. The linear sintering shrinkage of SiC samples sharply decreased with increasing fraction of coarse powder, with the minimum fraction as low as 14.5%. Moreover, the coarse SiC powder significantly suppressed abnormal grain growth in S-SiC ceramics by Zener pining of grain boundaries. As a result, SiC grains became smaller and equiaxial, which was beneficial for obtaining high flexural strength for S-SiC ceramic. Meanwhile, the introduction of coarse SiC powder induced fracture mode transfer S-SiC ceramic from transgranular type to transgranular-intergranular mixture type, resulting in improved fracture toughness. The S-SiC ceramic added with 65wt% coarse powder achieved an increase of 14.0% in flexural strength ((440±35) MPa) and 17.1% in fracture toughness ((4.92±0.24) MPa·m^1/2).

Key words: S-SiC, grain composition, microstructure, flexural strength, fracture toughness

中图分类号:

TQ174

邢媛媛, 吴海波, 刘学建, 黄政仁. 颗粒级配对固相烧结碳化硅陶瓷的影响[J]. 无机材料学报, 2018, 33(11): 1167-1172.

XING Yuan-Yuan, WU Hai-Bo, LIU Xue-Jian, HUANG Zheng-Ren. Grain Composition on Solid-state-sintered SiC Ceramics[J]. Journal of Inorganic Materials, 2018, 33(11): 1167-1172.

图/表 9

图1 两种不同SiC粉体的粒度分布曲线(a), D50=~0.5 µm (b)和D50=~4.6 µm (c)的SEM照片

Fig. 1 Size distribution curve (a) and morphology pictures of SiC powders with different sizes D50=~0.5 µm (b) and D50= ~4.6 µm (c)

表1 配方编号及粗细粉体比例

Table 1 Formula and the corresponding ratio of fine and coarse SiC powders

Formula	Ratio of coarse SiC powders/wt%	Ratio of fine SiC powders/wt%
C0	0	100
C55	55	45
C60	60	40
C65	65	35
C70	70	30
C75	75	25
C80	80	20

图2 颗粒级配对烧结收缩率(Rs)、密度(D)和相对密度(RD)的影响

Fig. 2 Effects of grain composition on linear shrinkage(Rs), density(D) and relative density(RD)

图3 颗粒级配对S-SiC陶瓷晶粒形貌的影响

Fig. 3 Effect of grain composition on the microstructures of S-SiC ceramics(a, b) C0; (c, d) C65

图4 颗粒级配对S-SiC陶瓷晶界的影响

Fig. 4 Effect of grain composition on the grain boundaries of S-SiC ceramics (a) C0; (b) C65

图5 颗粒级配对S-SiC陶瓷抗弯强度(σf)的影响

Fig. 5 Effect of grain composition on the flexure strength (σf) of S-SiC ceramics

图6 颗粒级配对S-SiC陶瓷维氏硬度(HV)的影响

Fig. 6 Effect of grain composition on the Vickers hardness (HV) of S-SiC ceramics

图7 颗粒级配对S-SiC陶瓷断裂韧性(KIC)的影响

Fig. 7 Effect of grain composition on the fracture toughness (KIC) of S-SiC ceramics

图8 颗粒级配对S-SiC陶瓷断面形貌的影响

Fig. 8 Effect of grain composition on the fracture surfaces of S-SiC ceramics(a) C0; (b) C65

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颗粒级配对固相烧结碳化硅陶瓷的影响

Grain Composition on Solid-state-sintered SiC Ceramics

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