Mechanical properties of Si3N4–Al2O3 FGM joints with 15 layers for high-temperature applications
Mechanical properties of Si3N4–Al2O3 FGM joints with 15 layers for high-temperature applications
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DOI：
10.1016/j.jeurceramsoc.2010.01.012
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发表时间：
2010-05
影响因子：
5.7
通讯作者：
C. Lee;J. Lemberg;D. Cho;J. Roh;R. Ritchie
中科院分区：
文献类型：
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作者：
C. Lee;J. Lemberg;D. Cho;J. Roh;R. Ritchie
“无裂纹”氧化铝-氮化硅接头由 15 层逐渐不同成分的 Al2O3/Si3N4 组成，使用赛隆多型体作为高温应用的功能梯度材料 (FGM) 粘合层来制造。通过在室温和高温下进行的弯曲强度测试，发现室温下的平均断裂强度为437MPa；值得注意的是，该值在高达 1000°C 的温度下没有变化。断口的扫描电子显微镜（SEM）观察表明三相点处不存在任何玻璃相。这一结果与之前报道的 20 层 Al2O3/Si3N4FGM 样品完全相反，其中三点弯曲测试显示高温下强度严重下降。因此，我们相信使用多型功能梯度将氧化铝连接到氮化硅可以显着提高这些接头在高温应用中的适用性。
“Crack-free” alumina-silicon nitride joints, comprised of 15 layers of gradually differing compositions of Al2O3/Si3N4, have been fabricated using sialon polytypoids as functionally graded materials (FGM) bonding layers for high-temperature applications. Using flexural strength tests conducted both at room and at elevated temperatures, the average fracture strength at room temperature was found to be 437MPa; significantly, this value was unchanged at temperatures up to 1000°C. Scanning electron microscopy (SEM) observations of fracture surfaces indicated the absence of any glassy phase at the triple points. This result was quite contrary to the previously reported 20-layer Al2O3/Si3N4FGM samples where three-point bend testing revealed a severe strength degradation at high temperatures. Consequently, we believe that the joining of alumina to silicon nitride using polytypoidally functional gradients can markedly improve the suitability of these joints for high-temperature applications.