摘要
以Ti和C的片状材料为原料,利用放电等离子烧结(SPS)技术烧结制备了具有层状结构特征的Ti/C叠层复合材料,研究了不同烧结温度下的叠层材料的组织形貌和室温力学性能。研究结果表明:随烧结温度的升高,反应层的厚度增大,烧结温度达到1500℃时,反应层的厚度可达到32.6μm,进一步提高烧结温度,将会使Ti发生熔化现象,无法得到Ti/C叠层复合材料。当烧结温度达到1500℃和1510℃,层状复合材料的抗弯强度和断裂功分别达到最大值1571.51MPa和215.09×103 J/m2。Ti/C叠层复合材料的裂纹扩展路径主要有裂纹偏转、裂纹并行扩展和裂纹尖端的分叉钝化,这些扩展路径是叠层材料增韧的主要机制。
The laminated structure of the Ti/C composite materials with the sheet of Ti and C as raw materials was prepared by spark plasma sintering （SPS） technology. Microstructure and room temperature mechanical properties of laminated material were studied at different sintering temperatures. The results show that the layer thickness increases with the sintering temperature. When the sintering temperature reaches 1500 ℃, the layer thickness is up to 32.6 μm. Ti will be partially melted when the sintering temperature is higher than 1500 ℃ and the Ti/C laminated composite material can＇t be obtained. When the sintering temperature reaches 1500 ℃and 1510 ℃, the laminated composite bending strength and fracture power reach the maximum value of 1571.51 MPa and 215.09 × 103 J/m^2, respectively. The crack propagation of Ti/C laminated material includes the crack deflection, crack parallel expansion and bifurcation of the crack tip passive, and these expansion pathes are the main toughening mechanism.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2012年第6期90-96,共7页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(51271091)
关键词
放电等离子烧结
叠层材料
抗弯强度
断裂功
增韧机制
spark plasma sintering
laminated material
bending strength
fracture power
toughening mechanism
