Preparation method for alumina ceramic: Fid-Bau Portal

Preparation method for alumina ceramic

ZHAO JINCHENG

The invention discloses a preparation method for aluminum oxide ceramic, belonging to the technical field of ceramic preparation. According to the invention, when carbon dioxide is used for carbonation decomposition to prepare aluminum hydroxide, the causticity ratio of a solution is reduced; aluminum hydroxide seed crystal decomposition is inhibited; the particle size of aluminum hydroxide formedaround is reduced; aluminum oxide particles in ceramic are changed into nanometer aluminum oxide with high density; ceramic particles in a formed ceramic blank have high bonding strength; the toughness and bending strength of the aluminum oxide ceramic are improved; nitrogen in ammonia gas is fixed into fermentation filter residues through the micro-corrosion effect of microorganisms in fruit peels; toughened modified powder is subjected to hot pressed sintering to form a hexagonal boron nitride crystal; the wear resistance of the aluminum oxide ceramic is improved; the toughness and the bending strength of the aluminum oxide ceramic are improved; meanwhile, diamond is an atomic crystal; atoms are bonded through sp3 hybrid orbits; the interface energy of the diamond is high; the interfacebonding capacity of diamond particles and the ceramic is reinforced; the density of the aluminum oxide ceramic is increased while curing shrinkage is achieved; and the bending strength is improved.

本发明公开了一种氧化铝陶瓷的制备方法，属于陶瓷制备技术领域。本发明以二氧化碳进行碳酸化分解制备氢氧化铝时，溶液的苛性比降低，氢氧化铝晶种分解受到抑制，周围形成的氢氧化铝粒度变细，使陶瓷中氧化铝颗粒变为致密度较高的纳米氧化铝，形成的陶瓷坯体中陶瓷颗粒间具有高结合强度，从而提高了氧化铝陶瓷的韧性和弯曲强度；通过果皮中微生物微腐作用将氨气中氮固定到发酵滤渣中，增韧改性粉热压烧结会形成六方氮化硼晶体，提高氧化铝陶瓷的耐磨性能，提升韧性和弯曲强度，同时金刚石为原子晶体，原子间以sp3杂化轨道成键，晶体界面能高，使金刚石颗粒与陶瓷的界面结合能力得到增强，固化收缩同时也增加了氧化铝陶瓷的致密度，提高了抗曲强度。

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