He Yixuan, Wang Xiaohong, Ding Ning, Jiang Hai, Lu Wenzhong
School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, China.
Wenzhou Advanced Manufacturing Institute, Huazhong University of Science and Technology, Wenzhou 325035, China.
Materials (Basel). 2024 Jul 10;17(14):3410. doi: 10.3390/ma17143410.
Isobam is widely used for fabricating ceramics through spontaneous gelation and has attracted considerable interest. However, the disadvantage of the Isobam system is the low gelation strength. The effects of suitable additives and the mechanism by which they effectively enhance the green body strength and the rheological behavior of an aluminum nitride (AlN) slurry with 50 vol% solid loading were investigated using polyethyleneimine (PEI), hydantoin epoxy resin, and trimethylolpropane triglycidyl ether (TMPGE). Results showed that the additives acted as both dispersants and cross-linkers in the AlN suspension using the Isobam gelling system. The flexural strength of the AlN green body increased by 42%, 204%, and 268% with the addition of 1 wt% PEI, 1 wt% hydantoin epoxy resin, and 0.5 wt% TMPGE, respectively. After sintering at 1700 °C, the AlN ceramic with 0.5 wt% TMPGE had flexural strength and thermal conductivity of 235 MPa and 166.44 W/(m·K), respectively, showing superior performance to the ceramics without additives.
异丁烯酸钡（Isobam）通过自发凝胶化被广泛用于制造陶瓷，并引起了广泛关注。然而，Isobam体系的缺点是凝胶强度低。使用聚乙烯亚胺（PEI）、乙内酰脲环氧树脂和三羟甲基丙烷三缩水甘油醚（TMPGE）研究了合适添加剂的效果以及它们有效提高50体积%固体含量的氮化铝（AlN）浆料生坯强度和流变行为的机制。结果表明，在使用Isobam凝胶体系的AlN悬浮液中，这些添加剂兼具分散剂和交联剂的作用。添加1 wt%的PEI、1 wt%的乙内酰脲环氧树脂和0.5 wt%的TMPGE后，AlN生坯的抗弯强度分别提高了42%、204%和268%。在1700℃烧结后，含有0.5 wt% TMPGE的AlN陶瓷的抗弯强度和热导率分别为235 MPa和166.44 W/(m·K)，表现出优于无添加剂陶瓷的性能。
