Failure analysis of the adhesive joint of microwave ferrite phase shifter |
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| Affiliation: | 1. University Vale do Acaraú, Center of Exact and Technological Sciences, Av. Dr. Guarani, 317, CIDAO Campus, Sobral-CE 62.040-370, Brazil;2. Center of Exact and Technological Sciences, State University Vale do Acaraú, Av. Dr. Guarani, 317, CIDAO Campus, Sobral-CE 62.040-370, Brazil;3. Department of Metallurgical and Materials Engineering, Federal University of Ceará, Campus Pici, Block 729 – Pici, Fortaleza – CE 60020-181, Brazil;1. School of Physics, D. A. University, Khandwa Road Campus, Indore 452001, India;2. UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India;3. INRIM, Electromagnetism Division, Strada Delle Cacce 91, I-10135 Torino, Italy;4. Università degli Studi di Torino, via P. Giuria 7, 10125 Torino, Italy;1. Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, PR China;2. Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou 730000, PR China;1. IDMEC, IST, University of Lisbon, Av. Rovisco Pais n°1, 1049 Lisbon, Portugal;2. WavEC – Offshore Renewables, Rua Jerónimo Osório n°11, 1400 Lisbon, Portugal |
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| Abstract: | Failure investigation is carried out on the adhesive joint of microwave ferrite phase shifter. Though, practically, the failure mode of microwave ferrite phase shifter can be described as the fracture of adhesive joint between ferrite and microwave dielectric ceramic, the failures of adhesive layer could be found in various ways and at various stages of manufacture, assembly and service. They may be due to the strength degradation caused by moisture environment, or the voids defects originated from dehydration effect of the adhesive as well as the contamination during manufacturing. With the help of SEM, FTIR and TGA, both the normal and failed samples of microwave ferrite phase shifter were selected, compared and analyzed. Recommendations for the structural design and the adhesive process are presented, and the responsibility of the failures was charged to the negligence of the manufacturer of the microwave ferrite phase shifters. |
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| Keywords: | Microwave ferrite phase shifter Epoxy resin adhesive Fracture Degradation of strength Defect |
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