What is ZTA?
ZTA is a composite with alumina matrix reinforced with 10–20% dispersed zirconia particles. The zirconia particles undergo stress-induced phase transformation at crack tips, dramatically improving fracture toughness while preserving alumina's high hardness.
ZTA vs Pure Materials
| Property | ZTA | Pure Al₂O₃ | Pure ZrO₂ |
|---|---|---|---|
| Toughness (MPa·m¹/²) | 5–7 | 3–4 | 10–15 |
| Hardness (GPa) | 15–17 | 15–17 | 12–13 |
| Max Service Temp | 1,500°C+ | 1,700°C | 1,000°C |
| Cost | $$ | $ | $$$ |
Choose ZTA when: Alumina parts are failing from impact/chipping but zirconia is over-specified. Ideal for valve components, plungers, and nozzles in moderate-impact service.
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