Full
Outline
In order to improve the fracture toughness of Y₂O₃ ceramics and realize the preparation of complex structures， Al₂O₃ whiskers （Al2O3w） are introduced to toughen Y₂O₃ ceramics， and Al2O3w/Y₂O₃ complex ceramic parts are successfully prepared by binder jetting method. The effects of Al2O3w content （1%， 3%， 5%，mass fraction，the same below） on the properties of green body forming， sintering densification， and mechanical properties are systematically investigated. The results show that the addition of Al2O3w has a little effect on the porosity of the green body， but significantly optimizes the sintering process. When the content of Al2O3w is 3%， the porosity of the sintered ceramics is as low as 57.47%， the flexural strength is enhanced to 6.54 MPa. The fracture toughness reaches 2.31 MPa·m1/2， which is 2.9 times higher than that of pure Y₂O₃. Excessive addition （5%） results in a rise in porosity to 59.47% and a decrease in fracture toughness to 1.54 MPa·m1/2. Microanalysis shows that Al2O3w inhibits crack propagation through the whisker-bridging and crack-deflection mechanism， with an optimal doping amount of 3%.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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