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Production process of high-hardness aluminum oxide ceramic
The invention discloses a production process of high-hardness alumina ceramics, yttrium oxide modified polyvinyl alcohol is used as an alumina ceramic binder, the binding property is greatly improved compared with that of polyvinyl alcohol, and the use amount of the binder can be reduced when the yttrium oxide modified polyvinyl alcohol is used as the binder to be added into a system; furthermore, holes and cracks formed in the glue discharging process are reduced, and improvement of density in the sintering process is facilitated; on the other hand, the regularity of a polyvinyl alcohol molecular chain can be reduced through modification treatment, and the adverse effect on the compactness of the aluminum oxide ceramic due to easy crystallization of polyvinyl alcohol is avoided; in addition, after the polyvinyl alcohol is removed, the yttrium oxide modified polyvinyl alcohol can generate yttrium oxide in situ to fill holes and cracks formed by precipitation of the polyvinyl alcohol in situ, so that the compactness of the aluminum oxide ceramic is further improved, and the aluminum oxide ceramic with high compactness and excellent mechanical properties can be obtained by adopting the forming process disclosed by the invention.
本发明公开了一种高硬度氧化铝陶瓷的生产工艺，通过采用氧化钇改性的聚乙烯醇作为氧化铝陶瓷粘结剂，相比于聚乙烯醇其粘结性能得到大幅度的提高，将其作为粘结剂添加入体系中能够降低粘结剂的用量，进而减少排胶过程中形成的孔洞和裂纹，有助于烧结过程中致密度的提高；另一方面，改性处理能够降低聚乙烯醇分子链的规整性，避免了聚乙烯醇容易结晶对氧化铝陶瓷致密性的不利影响；此外氧化钇改性聚乙烯醇在聚乙烯醇脱出后，能够原位产生氧化钇，原位填充由于聚乙烯醇析出形成的孔洞和裂纹，进一步提高氧化铝陶瓷的致密性，采用本发明所述成型工艺能够获得一种致密度高、力学性能优异的氧化铝陶瓷。
Production process of high-hardness aluminum oxide ceramic
The invention discloses a production process of high-hardness alumina ceramics, yttrium oxide modified polyvinyl alcohol is used as an alumina ceramic binder, the binding property is greatly improved compared with that of polyvinyl alcohol, and the use amount of the binder can be reduced when the yttrium oxide modified polyvinyl alcohol is used as the binder to be added into a system; furthermore, holes and cracks formed in the glue discharging process are reduced, and improvement of density in the sintering process is facilitated; on the other hand, the regularity of a polyvinyl alcohol molecular chain can be reduced through modification treatment, and the adverse effect on the compactness of the aluminum oxide ceramic due to easy crystallization of polyvinyl alcohol is avoided; in addition, after the polyvinyl alcohol is removed, the yttrium oxide modified polyvinyl alcohol can generate yttrium oxide in situ to fill holes and cracks formed by precipitation of the polyvinyl alcohol in situ, so that the compactness of the aluminum oxide ceramic is further improved, and the aluminum oxide ceramic with high compactness and excellent mechanical properties can be obtained by adopting the forming process disclosed by the invention.
本发明公开了一种高硬度氧化铝陶瓷的生产工艺，通过采用氧化钇改性的聚乙烯醇作为氧化铝陶瓷粘结剂，相比于聚乙烯醇其粘结性能得到大幅度的提高，将其作为粘结剂添加入体系中能够降低粘结剂的用量，进而减少排胶过程中形成的孔洞和裂纹，有助于烧结过程中致密度的提高；另一方面，改性处理能够降低聚乙烯醇分子链的规整性，避免了聚乙烯醇容易结晶对氧化铝陶瓷致密性的不利影响；此外氧化钇改性聚乙烯醇在聚乙烯醇脱出后，能够原位产生氧化钇，原位填充由于聚乙烯醇析出形成的孔洞和裂纹，进一步提高氧化铝陶瓷的致密性，采用本发明所述成型工艺能够获得一种致密度高、力学性能优异的氧化铝陶瓷。
Production process of high-hardness aluminum oxide ceramic
一种高硬度氧化铝陶瓷的生产工艺
HUANG CHAO (author) / ZHENG HONGZHONG (author) / ZHANG SHASHA (author)
2024-04-26
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
Preparation method of high-hardness aluminum oxide composite ceramic
| European Patent Office | 2024