Alumina ceramic slurry, alumina green tape and preparation method: Fid-Bau Portal

Alumina ceramic slurry, alumina green tape and preparation method

LUO GUICHENG / ZHAO HAILONG / WANG GANG / SHANG HUA

The invention belongs to the technical field of aluminum oxide ceramics, and particularly relates to aluminum oxide ceramic slurry, an aluminum oxide green tape and a preparation method. The invention aims to overcome the defects of powder agglomeration and non-uniform slurry dispersion in the existing water system tape casting process; in order to solve the technical problems that in the prior art, the alumina ceramic slurry, the alumina raw belt and the preparation method are provided, and the blank piece is high in brittleness and easy to crack during drying. According to the preparation method, the high-purity Al2O3 powder is firstly modified, and then the composite dispersing agent is adopted to achieve the maximum steric hindrance stability; then compounding a latex binder and a water-soluble binder to fully ensure the dispersion stability of the slurry; adjusting the pH value of the slurry to obtain the ceramic slurry with the maximum absolute value of the primary particle surface potential and the maximum electrostatic stability; and finally, an aqueous tape casting technology is adopted to prepare the aluminum oxide wide-width tape casting green tape with good flexibility, high mechanical strength and high green body density, so that the aluminum oxide wide-width tape casting green tape can be widely applied to the fields of microwave communication, microwave frequency bands and the like.

本发明属于氧化铝陶瓷技术领域，具体涉及氧化铝陶瓷浆料、氧化铝生带及制备方法。为了克服现有水系流延工艺中粉体多团聚，浆料分散不均；且坯片脆性大，干燥时容易开裂等技术问题，本发明提供一种氧化铝陶瓷浆料、氧化铝生带及制备方法。本发明先对高纯Al2O3粉体进行改性处理，再采用复合分散剂以达到最大的空间位阻稳定；然后采用乳胶粘结剂与水溶性粘结剂复合，充分保证浆料的分散稳定性能；再调节浆料pH值，以获得一次颗粒表面电位的绝对值最大，达到最大的静电稳定的陶瓷浆料；最后采用水系流延技术，制备出柔韧性好、机械强度高、生坯密度高的氧化铝宽幅流延生带，从而能广泛应用于微波通信及微波频段等领域。

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