Aluminum nitride (AlN) ceramic substrates have been fabricated using non-aqueous tape casting and pressureless densification under flowing N 2 atmosphere. Considering the economic and environmental impact, a new strategy of solvent and dispersant system was adopted to prepare AlN slurries with high solid loading. According to the viscosity characteristics of AlN slurries, dispersant content was adjusted to be 0.5 wt% of AlN powder in order to optimize the rheological behavior of AlN slurries. The addition contents of binder and plasticizer were both optimized as 5 wt% of AlN powders by combining the viscosity of slurries and tensile strength of green tapes. Green AlN tapes were fabricated with an optimized tape casting process such as dry temperature. The exclusion process of organic additives was investigated by employing thermogravimetric analysis. Flat and dense AlN ceramic substrates with a relative bulk density over 99.75 % were achieved after being sintered under 1800°C for 6 hours, which had a maximum size of 110 × 110 mm. The thermal conductivity of the AlN substrate could reach 145 Wm −1 K −1. K E Y W O R D S aluminum nitride, tape casting, thermal conductivity, viscosity How to cite this article: Ding M, Shi Y, Xie J, et al. Optimization of non-aqueous tape casting of high solid loading slurry for aluminum nitride ceramic substrates.

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Aluminum oxynitride (γ-AlON) powders were synchronously synthesized by carbothermal reduction-nitridation (CRN) and high-temperature solid state reaction (SSR) methods. Twin structures existing in γ-AlON powders and transparent AlON ceramics were investigated by systematically employing electron backscattered

Abstract. In the present study, silk was dissolved in CaCl 2 -formic acid and CaCl 2 -C 2 H 5 OH-H 2 O to obtain silk fibroin solution. The dissolve process, morphology, structure and mechanical properties of nanofibers prepared by electrospinning were studied. It showed that nanofibril structures were exhibited in the silk fibroin solution in CaCl 2 -formic acid compared with traditional method dissolving in CaCl 2 -C 2 H 5 OH-H 2 O solution, and the viscosity of the solution was much higher. The average diameter of nanofibers prepared by CaCl 2 -formic acid dissolution method was 375±26nm, and it showed well drawability, after stretching to 1 times, its breaking strength and elongation at break reaching 18.6±3.8MPa and 14.0±2.5%, respectively, was improved obviously relative to nanofibers prepared by CaCl 2 -C 2 H 5 OH-H 2 O dissolution method. It demonstrated that the good mechanical property of fibers was contributed to the fibrillar structures in the solution.