| Autor: |
Behler, K. D., LaSalvia, J. C., Shanholtz, E. R., Golt, M. C., Walck, Scott, Kuwelkar, K. A. |
| Předmět: |
|
| Zdroj: |
Ceramic Engineering & Science Proceedings; 2016, Vol. 37 Issue 4, p21-30, 10p |
| Abstrakt: |
The effect of 5 vol.% Al2O3 additive on the densification behavior and resulting microstructures of a hot-pressed commercial B4C powder has been investigated. A maximum density of 95% TD was achieved for the as-received B4C powder by hot-pressing at 2000°C and 17.5 MPa. With Al2O3, densities > 99% TD were obtained between 1900°C - 2000°C. Densities increased linearly with temperature between 1700°C - 1900°C and 1800°C - 2000°C for B4C powders with and without Al2O3, respectively. Densification behavior was monitored during hotpressing by measuring the hot-press ram displacement using an LVDT. During the temperature ramp, Al2O3 had a negligible effect on the densification onset temperature, but increased the average densification rate by 83% in the rapid densification regime. Only B4C and Al2O3 phases were detected in the densified samples. Al2O3 was observed as a distinct secondary grains or as smaller particles located at triple junctions and grain boundaries. B4C grain morphology and size remained essentially constant over the range of hot-pressing temperatures for both the as-received and Al2O3 containing powders. Experimental procedures and results are presented. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Plný text