Joining of SiC ceramics by combining NITE-SiC interlayer and its thickness control
Joining of SiC ceramics by combining NITE-SiC interlayer and its thickness control
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DOI：
10.1016/j.jeurceramsoc.2023.01.024
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发表时间：
2023-01
影响因子：
5.7
通讯作者：
Chuang-Tian Zhan;Sheng-Jin He;Wei‐Ming Guo;Yuanzi Chen;Shikuan Sun;Hua-Tay Lin
中科院分区：
文献类型：
--
作者：
Chuang-Tian Zhan;Sheng-Jin He;Wei‐Ming Guo;Yuanzi Chen;Shikuan Sun;Hua-Tay Lin
采用添加Al 2 O3-Y2 O3-MgO-CaO添加剂的纳米SiC粉体（NITE-SiC）作为连接材料，结合中间层厚度控制（≤ 10 μm和≤ 60 μm），实现了SiC陶瓷的低温连接。在1650 ℃下连接后，在厚度为160 μm的中间层中观察到一些残余孔隙，SiC接头的剪切强度为39.3 ± 5.5 MPa。观察表明，接头断裂发生在夹层处。当中间层的厚度减小到10 μm时，在1650 ℃下连接后，在界面区域没有观察到裂纹或孔隙。SiC接头的剪切强度提高到69.5 ± 8.9MPa，断裂起源于基体。结果表明，采用添加Al 2 O3-Y2 O3-MgO-CaO的NITE-SiC作为连接层，减小中间层的厚度，可以降低连接温度，显著提高接头的机械强度。
Combined with the thickness control of interlayers (∼10 µm and ∼60 µm), SiC nano-powders with Al2O3-Y2O3-MgO-CaO additive (NITE-SiC) were used as the joining materials to achieve the low-temperature joining of SiC ceramics. Some residual pores were observed in the interlayer with a thickness of ∼60 µm after joining at 1650 ℃, and the shear strength of SiC joints measured was 39.3 ± 5.5 MPa. Observations showed the fracture of joints occurred at the interlayer. When the thickness of the interlayer decreased to ∼10 µm, no cracks or porosity were observed at the interface region after joining at 1650 ℃. The shear strength of SiC joints increased to 69.5 ± 8.9 MPa, and the fracture originated from the matrix. The results demonstrated using NITE-SiC with Al2O3-Y2O3-MgO-CaO additive as the joining layer and reducing the thickness of the interlayer could lower the joining temperature and significantly improve the mechanical strength of joints.