| Effect of sintering additives of carbon black, SiC, Al2O3, and Al2O3 + Y2O3 on microstructure and mechanical properties of B4C ceramics |
Wei Zhang1
, Jie Zhang1,2 |
1Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, Liaoning, China
2School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, Liaoning, China |
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Received: May 10, 2024; Revised: June 21, 2024 Accepted: July 5, 2024. Published online: July 16, 2024. |
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| ABSTRACT |
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B4C ceramics are widely used as structural materials in the field of engineering. B4C ceramics are difficult to sinter; therefore, various sintering additives are added to B4C ceramics. The mechanisms of different sintering additives that promote the sintering of B4C ceramics are different. In this study, the effect of 3 wt % sintering additives of carbon black (CB), SiC, Al2O3, Al2O3 + Y2O3 on the phase compositions, microstructure, and mechanical properties of the hot-press sintered B4C ceramics with a certain degree of porosity are studied. When CB is selected as the sintering additive, there is no free carbon in the final B4C ceramics, which is attributed to its complete consumption with oxide film impurities existing on the B4C starting powders. The sintering additives of SiC and Al2O3 exist in the form of crystals, while Y3Al5O12 generated from the sintering additive of Al2O3 + Y2O3 exists in amorphous form in the final B4C ceramics. In the case of the same low additive amount, the sintering additives of Al2O3 and Y3Al5O12 are more conducive to promoting the sintering of B4C ceramics than the sintering additives of CB and SiC. The difference in the average gain sizes of the B4C ceramics with different types of sintering additives is not obvious. Different types of sintering additives determine the mechanical properties of the hot-press sintered B4C ceramics by affecting their porosity, grain size, and grain boundary characteristics. |
| Key words:
B4C ceramics · Sintering additive · Mechanical properties · Porosity · Grain size · Grain boundary |
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