.png){kind=icon}
.png){kind=icon}
Return
Preparation of dense B4C ceramics via epoxy system gelcasting and different sintering methods
.png){kind=icon}
PRE
AI
DOI：10.1111/jace.20579.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Gelcasting is proven effective for the mass production of large-sized and complex-shaped B4C ceramics. In this study, the uniform B4C green body with a relative density of 54.17% and compressive strength of 13.37 MPa was prepared by epoxy gelcasting. The nonlinear drying process of the epoxy system was investigated by real-time monitoring, which guided the preparation route to prevent green bodies defects. Two sintering methods, spark plasma sintering (SPS) and pressureless sintering, were employed to densify the B4C green bodies. Due to the high quality of green body obtained by gelcasting, B4C ceramics with a dense and fine-grained microstructure were successfully prepared via SPS at 1700 degrees C. When the B4C ceramics was pressureless sintered alone at 2250 degrees C, their densification were failed and instead caused abnormal grain growth. By incorporating TiB2, the pressureless sintering of B4C at 2100 degrees C basically achieved densification, reaching a relative density of 95.04%. The gelcasting process enabled uniform distribution of TiB2 grains in the B4C matrix, which not only inhibited grains growth, but also promoted the sintering ability of B4C ceramics. These results provide valuable insights into the epoxy gelation of B4C ceramics, showing potential for large-scale production of complex-shaped B4C ceramics at relatively low sintering temperatures.
Keywords:
boron carbide (B4C)
densification
gelcasting
pressureless sintering
spark plasma sintering (SPS)
Journal
IF:
3.8
Papers:
1.7W
Citations:
5.4W