High-vacuum sintering is a sintering technology that sinters ceramic bodies in a high-vacuum state. Vacuum sintering has attracted many scholars' attention in the preparation of low-porosity, small-sized ceramics due to its advantages such as reducing the heating rate, inhibiting abnormal growth of the product, and reducing the irregular porosity.
High-vacuum sintering can not only enhance some of the properties of high-purity alumina ceramics, but also reduce impurities at the grain boundaries and pores in the structure. In the process of preparing high-purity alumina ceramics by vacuum sintering, the oxygen ions in the alumina lattice are easily lost. A large number of oxygen ion vacancies are formed, and the aluminum ion concentration is relatively increased. This leads to the diffusion process of aluminum ions, which is beneficial to the progress of sintering.
Brief introduction of alumina ceramic high vacuum sintering process