颗粒级配对重结晶SiC蜂窝陶瓷显微结构与力学性能的影响
Effects of particle gradation on microstructure and mechanical properties of recrystallized SiC honeycomb ceramics
闵昌胜 1董博 1余超 1邓承继 1邢广超 1丁军 1刘浩 1祝洪喜1
作者信息
- 1. 武汉科技大学省部共建耐火材料与冶金国家重点实验室 湖北武汉 430081
- 折叠
摘要
以不同粒径(0.5、25、38和45 μm)α-SiC粉末为原料,采用重结晶烧结工艺制备碳化硅蜂窝陶瓷,探究了颗粒级配对重结晶碳化硅(R-SiC)显微形貌、孔径分布及物理性能的影响.结果表明:1)经2 200℃保温1 h烧成后,与仅添加25、0.5 μm双粒径颗粒级配相比,随着38和45 μm粒径α-SiC的逐步引入,R-SiC蜂窝陶瓷的烧结致密度无明显变化,但R-SiC粗颗粒间的平均烧结颈面积增大,中位孔径提高且孔径分布更为集中.2)当α-SiC原料的颗粒级配为25、0.5、38 μm三种粒径时,R-SiC蜂窝陶瓷力学性能达到最优,其常温抗压强度、体积密度、显气孔率分别为18.0 MPa、1.81 g·cm-3、40.8％.
Abstract
SiC honeycomb ceramics were prepared by recrystallization sintering using α-SiC powders of dif-ferent particle sizes(0.5,25,38,and 45 μm)as raw materials.The effects of the particle gradation on the micro-morphology,pore size distribution,and leading physical properties of the recrystallized silicon car-bide(R-SiC)were investigated.The results show that:(1)after sintering at 2 200 ℃ for 1 h,compared with the honeycomb ceramics with only 25 and 0.5 μm SiC,those with the gradual introduction of 38 and 45 μm SiC have similar sintered density,larger average sintered neck area between R-SiC coarse particles,higher median aperture size,more concentrated pore size distribution,and fist increased and then declined cold compressive strength;(2)the mechanical properties of R-SiC honeycomb ceramics are the optimal when the particle gradation is 25,0.5,and 38 μm,with the cold compressive strength,bulk density,and apparent porosity of 18.0 MPa,1.81 g·cm-3,and 40.8％,respectively.
关键词
重结晶碳化硅/蜂窝陶瓷/烧结颈/气孔特性/力学性能Key words
recrystallized silicon carbide/honeycomb ceramics/sintered necks/pore properties/mechanical properties引用本文复制引用
基金项目
国家自然科学基金联合基金项目(U20A20239)
湖北省重点研发计划(2021BAD002)
湖北省重点研发计划(2022BAA032)
出版年
2024
NETL
NSTL
万方数据