Green gelcasting of aluminum nitride using environmental sustainable ovalbumin natural binder
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Ceramic powder casting technique using ovalbumin, i.e., egg protein, as natural amino-based binder. The study has shown successful gelcasting of high-performance 3D thermal conductivity aluminum nitride (AlN) for application in the 3D integrated circuits (3D-IC). The green body has a good flexural strength of 3 MPa, which is sufficiently be trimmed with computerized numerical controlled (CNC) machining prior to the pyrolysis manufacturing processes, i.e., sintering technologies. Different particle sizes of AlN powder was being investigated and the results indicated bimodal particle size ratio of 1.5 to 2 attributed the most favorable combination in this study. Doped of rare earth element, yttrium oxide (Y2O3) nano particle size, has shown an improvement in overall thermal conductivity of 3D sintered objects. SEM images also well demonstrated higher thermal conductivity value are linked with a compact structure of higher density of 3D ceramic objects.
KeywordsAlN Aluminum nitride Ovalbumin Gelcasting Green casting
The authors are very grateful to Prof. Y.H. Wang and PhD Candidate Mr. Yong Wen from the Department of Civil and Environmental Engineering, the Hong Kong Polytechnic University, that supported the rheology measurement; Prof. Thomas M.H. Lee and PhD Candidate Ms. Qijin He from the Department of Biomedical Engineering, the Hong Kong Polytechnic University, that supported the particle size measurement used in this research study.
The author would like to thank the Hong Kong Polytechnic University (student account code RUV-3), the Hong Kong Research Grant Council (Hong Kong PhD Fellowship Scheme, Ref No. PF14-11496), the PolyU Micro Fund, and the Electro Precision Technology Sdn Bhd for providing financial support that allows for the related research work in this paper.
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