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烧结温度对物理气相传输制备定向多孔SiC陶瓷组织和性能的影响

发表时间:2014-05-15  浏览量:1675  下载量:514
全部作者: 刘波波,杨建锋
作者单位: 西安交通大学金属材料强度国家重点实验室
摘 要: 针对SiC高温再结晶工艺获得的定向多孔SiC陶瓷,研究烧结温度对材料组织结构和性能的影响。结果表明:在烧结温度低于2 050℃时,获得的多孔陶瓷为近似各向同性的均匀多孔结构。当烧结温度超过2 150℃时,定向多孔SiC陶瓷开始形成,随着温度的增加烧失率增加,轴向弯曲强度大于径向弯曲强度,径向强度值先稍微增加后下降。在0.3×105~0.5×105 Pa的Ar气氛、烧结温度2 300℃和时间2 h的条件下,对自由堆积松散成型的SiC样品进行烧结,可获得气孔形态和晶粒取向沿轴向定向排列的多孔SiC陶瓷,其气孔率高达63.2%,轴向与径向的强度比为5.34~5.69.
关 键 词: 无机非金属材料;多孔陶瓷;SiC;高温再结晶
Title: Effects of sintering temperature on microstructures and properties of directional porous silicon carbide ceramic prepared via physical vapor transport
Author: LIU Bobo, YANG Jianfeng
Organization: State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University
Abstract: For the directional porous SiC ceramics obtained by the high-temperature recrystallization process, effects of sintering temperature on the microstructure and mechanical properties were investigated. The results showed that the porous SiC ceramics obtained was the approximate isotropic homogeneous porous structure when the sintering temperature was below 2 050℃. When the temperature exceeded 2 150℃, the formation of orientation of porous silicon carbide began, and as the temperature increased, the weight loss increased, and the axial bending strength became higher than the radial value, which was slightly increased followed by decrease. With condition of an Ar atmosphere of 0.3×105-0.5×105 Pa, the sintering temperature of 2 300℃ and soaking time of 2 h, the loosely packed SiC samples were sintered and oriented porous SiC ceramics with axially aligned pore and grain were obtained. The porosity reached to 63.2%, and the ratio of axial and radial strength was 5.34-5.69.
Key words: inorganic nonmetallic material; porous ceramics; SiC; high temperature recrystallization
发表期数: 2014年5月第9期
引用格式: 刘波波,杨建锋. 烧结温度对物理气相传输制备定向多孔SiC陶瓷组织和性能的影响[J]. 中国科技论文在线精品论文,2014,7(9):835-839.
 
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