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Different two-step sintering programs performed in this study. The initial heating rate to TEMP 1 was 5 °C min−1. TD is the theoretical density.
| Program | TEMP 1 | Time 1 | TEMP 2 | Time 2 | Density | % of TD |
|---|---|---|---|---|---|---|
| (°C) | (min) | (°C) | (h) | (g cm−3) | ||
| 1 | 1300 | 1 | 1100 | 15 | 5.84 | 96.4 |
| 2 | 1300 | 1 | 1200 | 15 | 6.05 | 99.9 |
| 3 | 1200 | 1 | 1100 | 15 | 4.94 | 81.6 |
| 4 | 1400 | 1 | 1150 | 15 | 5.69 | 93.9 |
| 5 | 1400 | 1 | 1200 | 15 | 5.88 | 97.1 |
