Effect of intergranular phase chemistry on the sliding-wear resistance of pressureless liquid-phase-sintered α-SiC
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| Title: | Effect of intergranular phase chemistry on the sliding-wear resistance of pressureless liquid-phase-sintered α-SiC |
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| Authors: | Ciudad, E.1, Borrero-López, O.1, Rodríguez-Rojas, F.1, Ortiz, A.L. alortiz@unex.es, Guiberteau, F.1 |
| Source: | Journal of the European Ceramic Society. Feb2012, Vol. 32 Issue 2, p511-516. 6p. |
| Subjects: | Sintering, Silicon carbide, Polycrystals, Ceramics, Isostatic pressing, Sliding friction |
| Abstract: | Abstract: The effect was investigated of the intergranular phase chemistry on the sliding-wear resistance of pressureless liquid-phase-sintered (PLPS) α-SiC densified with 10vol.% 5Al2O3 +3RE2O3 (RE=La, Nd, or Yb) additives. It was found that the sliding-wear behaviour of these ceramics is similar to what is observed in other polycrystalline ceramics: initial mild, plasticity-controlled wear followed by severe, fracture-controlled wear, with a well-defined wear transition. Most importantly, the sliding-wear resistance of PLPS SiC is found to increase with decreasing size of the RE3+ cation in the rare-earth oxide additive, with a lower susceptibility to mild and severe wear and a delayed transition to severe wear. Underlying this effect is likely the hardening of the intergranular phase resulting from the increase in the field strength of the RE3+–O2− bonds as the size of the RE3+ cation decreases. Tailoring the intergranular phase chemistry via the selection of RE2O3 sintering additives with cations as small as possible thus emerges as a potentially interesting approach to improving the sliding-wear resistance of PLPS SiC ceramics. [Copyright &y& Elsevier] |
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| Database: | Engineering Source |
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