The preparation and mechanical properties of carbon–carbon/lithium–aluminum–silicate composite joints
The preparation and mechanical properties of carbon–carbon/lithium–aluminum–silicate composite joints
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DOI：
10.1016/j.matdes.2012.07.060
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发表时间：
2013-02
影响因子：
8.4
通讯作者：
Kezhi Li;Jie Wang;Xiao-bin Ren;Hejun Li;Wei Li;Zhao-qian Li
中科院分区：
文献类型：
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作者：
Kezhi Li;Jie Wang;Xiao-bin Ren;Hejun Li;Wei Li;Zhao-qian Li
以硅酸镁铝（MAS）微晶玻璃为中间层，采用真空热压技术成功地将碳化硅改性碳布层压C-C复合材料与锂铝硅酸盐（LAS）微晶玻璃连接。研究了C-C/LAS复合材料接头的显微组织、力学性能和断裂机制。SiC涂层改善了C-C复合材料与LAS微晶玻璃之间的润湿性。通过元素的相互扩散和化学反应，形成了三个连续、均匀的界面（C-C/SiC、SiC/MAS和MAS/LAS），使C-C复合材料向LAS微晶玻璃的过渡过程更加平滑。C-C/LAS节点具有上级抗弯性能，并具有准延性性能。C-C/LAS接头在25°C和800°C下的平均弯曲强度分别可达140.26MPa和160.02MPa。C-C/LAS接头的平均剪切强度达到21.01 MPa，接头易沿着SiC/MAS界面断裂。在800°C下保持较高的机械性能，使接头有可能在较宽的温度范围内用作结构部件。
Silica carbide modified carbon cloth laminated C–C composites have been successfully joined to lithium–aluminum–silicate (LAS) glass–ceramics using magnesium–aluminum–silicate (MAS) glass–ceramics as interlayer by vacuum hot-press technique. The microstructure, mechanical properties and fracture mechanism of C–C/LAS composite joints were investigated. SiC coating modified the wettability between C–C composites and LAS glass–ceramics. Three continuous and homogenous interfaces (i.e. C–C/SiC, SiC/MAS and MAS/LAS) were formed by element interdiffusions and chemical reactions, which lead to a smooth transition from C–C composites to LAS glass–ceramics. The C–C/LAS joints have superior flexural property with a quasi-ductile behavior. The average flexural strength of C–C/LAS joints can be up to 140.26MPa and 160.02MPa at 25°C and 800°C, respectively. The average shear strength of C–C/LAS joints achieves 21.01MPa and the joints are apt to fracture along the SiC/MAS interface. The high retention of mechanical properties at 800°C makes the joints to be potentially used in a broad temperature range as structural components.