纯铜钎料用于透氧膜陶瓷与不锈钢支撑体之间的封接

Pure Cu braze for sealing oxygen-permeable membrane ceramics and stainless steel support

采用纯铜钎料用于透氧膜与不锈钢支撑体之间的封接,测试了纯铜钎料、透氧膜与不锈钢支撑体三者的热膨胀系数,研究了透氧膜与纯铜钎料在空气中钎焊后封接界面的形貌,以及钎焊接头在氧化/还原双重气氛下的密封性和稳定性。结果显示,在30～1000℃范围内,三者的热膨胀系数比较接近。封接后纯铜钎料与透氧膜连接界面无裂纹等缺陷,在透氧膜一侧生成一层由Cu扩散所致的厚度约为350μm的反应层。875℃透氧10h封接部位没有泄漏发生,透氧膜一侧的反应层厚度基本不变。

Pure Cu braze was used to seal oxygen-permeable membrane ceramics and stainless steel support.The thermal expansion coefficients of Cu braze,oxygen-permeable membrane and stainless steel were tested.The interfacial morphology of oxygen-permeable membrane and Cu braze after brazing in air was observed.The hermeticity and stability of joint were investigated during oxygen permeating.The results show that their thermal expansion coefficients are similar.No cracks have been found at the interface of Cu braze and oxygen-permeable membrane after brazing.A reaction layer due to Cu diffusion on the membrane side has been observed and the thickness of this reaction layer is about 350 μm.The jointing interface is gas-tight after oxygen permeating for 10h and the thickness of reaction layer on the BCFNO side keeps invariable.