Yttria-Stabilized Zirconia (YSZ) Powder: 3Y-TZP & 8Y-CSZ Grades — Tosoh TZ-Series Equivalents
Yttria-stabilized zirconia powders engineered to match Tosoh TZ-3Y and TZ-8Y specifications — spray-dried and attrition-milled grades for structural ceramics, dental prosthetics, SOFC electrolytes, and thermal barrier coatings.
Contents
| 2 | Tosoh TZ-equiv. | 30–50% |
|---|---|---|
| YSZ Grades | Performance Benchmark | Cost Advantage |
YSZ Powder Technology: Stabilization Mechanisms & Phase Control
Adding yttria suppresses zirconia's destructive monoclinic-to-tetragonal phase transformation at ~1170°C. At 3 mol% Y₂O₃, the metastable tetragonal phase enables transformation toughening (8–12 MPa·m^0.5). At 8 mol% Y₂O₃, the cubic fluorite phase maximizes oxygen-ion conductivity (0.10–0.13 S/cm at 1000°C). SEMITECH's co-precipitation route ensures atomic-level Y₂O₃ mixing for uniform phase distribution.
3Y-TZP — Tetragonal Zirconia for Mechanical Applications
| Parameter | Value | Test Method |
|---|---|---|
| ZrO₂ + HfO₂ | ≥94.5 wt% | XRF |
| Y₂O₃ | 5.15 ± 0.20 wt% | XRF |
| Al₂O₃ | 0.25 ± 0.10 wt% | XRF |
| SiO₂ | ≤0.02 wt% | ICP-OES |
| Fe₂O₃ | ≤0.01 wt% | ICP-OES |
| Na₂O | ≤0.04 wt% | ICP-OES |
| d50 (spray-dried granule) | 30–80 μm | Laser diffraction |
| d50 (attrition-milled) | 0.3–0.6 μm | Laser diffraction |
| BET surface area | 7–15 m²/g | N₂ adsorption (ISO 9277) |
| Sintered density | ≥6.05 g/cm³ | Archimedes method |
| Flexural strength (sintered) | ≥1000 MPa | 3-point bend (ISO 6872) |
| Fracture toughness | 8–12 MPa·m^0.5 | SEVNB / IF method |
Applications: dental crowns/bridges, structural ceramic components for semiconductor equipment, optical fiber ferrules, and precision valve/pump components. The 0.25 wt% Al₂O₃ reduces sintering temperature to ~1450°C while maintaining grain size <0.5 μm.
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8Y-CSZ — Cubic Zirconia for Ionic Conduction
| Parameter | Value | Test Method |
|---|---|---|
| ZrO₂ + HfO₂ | ≥86.0 wt% | XRF |
| Y₂O₃ | 13.6 ± 0.30 wt% | XRF |
| Al₂O₃ | ≤0.10 wt% | XRF |
| SiO₂ | ≤0.02 wt% | ICP-OES |
| d50 (spray-dried) | 30–80 μm | Laser diffraction |
| d50 (attrition-milled) | 0.3–0.5 μm | Laser diffraction |
| BET surface area | 6–12 m²/g | N₂ adsorption (ISO 9277) |
| Sintered density | ≥5.90 g/cm³ | Archimedes method |
| Ionic conductivity (1000°C) | 0.10–0.13 S/cm | EIS (4-point) |
Applications: SOFC electrolyte membranes, thermal barrier coatings (EB-PVD and APS), lambda oxygen sensors, and electrochemical oxygen pumps. Must sinter to >99% density for gas-tight electrolyte membranes.
Grade Comparison — Buyer Specification Reference
| Parameter | SEMITECH 3Y-TZP | Tosoh TZ-3YS-E | SEMITECH 8Y-CSZ | Tosoh TZ-8YS |
|---|---|---|---|---|
| Y₂O₃ (wt%) | 5.15 ± 0.20 | 5.15 ± 0.20 | 13.6 ± 0.30 | 13.3 ± 0.50 |
| Al₂O₃ (wt%) | 0.25 ± 0.10 | 0.25 ± 0.10 | ≤0.10 | ≤0.05 |
| d50 (μm) | 0.3–0.6 | 0.4–0.6 | 0.3–0.5 | 0.4–0.5 |
| BET (m²/g) | 7–15 | 7–10 | 6–12 | 6–8 |
| Sintered density (g/cm³) | ≥6.05 | ≥6.05 | ≥5.90 | ≥5.90 |
| Price index | 100 | 150–180 | 100 | 160–200 |
Supply Chain: Tosoh Alternative Sourcing
Tosoh capacity constraints have extended lead times to 16–24 weeks since 2024. SEMITECH maintains relationships with three Chinese YSZ producers at >5,000 MT/year combined capacity, with annual audits covering raw material traceability, process control, and QC capability. Free 1 kg evaluation samples with full analytical package available — contact info@semitechnm.com.
FAQ
+What is the difference between 3Y-TZP and 8Y-CSZ?
3Y-TZP (3 mol% yttria) retains the tetragonal phase for maximum strength (≥1000 MPa, 8–12 MPa·m^0.5) — used for structural and dental ceramics. 8Y-CSZ (8 mol% yttria) stabilizes the cubic phase for maximum ionic conductivity (0.10–0.13 S/cm at 1000°C) — used for SOFCs and sensors. Not interchangeable.
+Can SEMITECH YSZ directly replace Tosoh TZ-3Y?
In most cases, yes. Minor powder morphology differences may require sintering profile adjustment of ±10–20°C. SEMITECH provides optimization guidance and test-sintering data.
+What powder form should I specify?
Spray-dried (d50 30–80 μm) for dry pressing and CIP. Attrition-milled (d50 0.3–0.6 μm) for slip casting, tape casting, and ceramic injection molding.
+What are typical lead times and MOQ?
Stock: 7–14 days, MOQ 25 kg. Custom specs: 4–6 weeks, MOQ 100 kg. Annual supply agreements available above 1 MT/year.