Y2O3 SINT-99.9
Grade · default condition
SINT-99.9 = pressed and sintered dense Y2O3, 99.9 % purity
Standard opaque structural/crucible grade: dense sintered yttria for molten-metal crucibles, furnace parts and plasma-chamber components.
Values for the SINT-99.9 condition
Other Y2O3 tempers and conditions
Y2O3 is listed in 2 conditions; see the grade overview at Y2O3.
- SINT-99.9
- HIP-TRANS
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SINT-99.9DefaultThis page Pressed and sintered dense Y2O3, 99.9 % purity | Standard opaque structural/crucible grade: dense sintered yttria for molten-metal crucibles, furnace parts and plasma-chamber components. | — | — | — | 700 HV | 13 W/m·K |
vacuum-sintered/HIPed transparent polycrystalline Y2O3 | Choose for IR windows/domes and laser hosts: pore-free HIPed body transparent from ~0.3 to 8 µm. | — | — | — | 740 HV | 14 W/m·K |
What is Y2O3 SINT-99.9?
Y2O3 SINT-99.9 is Y2O3 in the SINT-99.9 grade — standard opaque structural/crucible grade: dense sintered yttria for molten-metal crucibles, furnace parts and plasma-chamber components. The elastic modulus is 165 GPa (23.9 Msi). Y2O3 SINT-99.9 has a density of 5.01 g/cm³ (0.181 lb/in³), heavier than 51% of ceramic grades. It melts at 2,425°C (4,397 °F).
Advantages
- High service temperature — 2,000°C (3,632 °F), better than 94% of ceramic grades
- Good corrosion resistance — 92/100, better than 88% of ceramic grades
Y2O3 SINT-99.9 properties
Typical room-temperature values for Y2O3 SINT-99.9; 10 are specific to this condition. Other listed values are Y2O3 reference data and may not represent this condition. Bars are the position among ceramic grades.
Physical5
Y2O3 SINT-99.9 has a density of 5.01 g/cm³ (0.181 lb/in³), heavier than 51% of ceramic grades. It melts at 2,425°C (4,397 °F).
Mechanical10
The elastic modulus is 165 GPa (23.9 Msi).
Thermal5
Y2O3 SINT-99.9 is rated for continuous service to 2,000°C (3,632 °F). It conducts heat at 13 W/m·K (7.51 BTU/hr·ft·°F), worse than 58% of ceramic grades. Thermal expansion is 7.6 µm/m·K (4.22 µin/in·°F).
Electrical5
Y2O3 SINT-99.9 is an electrical insulator with a dielectric strength of 12 kV/mm (304.8 V/mil) and a resistivity of 1×10¹² Ω·m.
Chemical & Environmental2
Corrosion resistance is excellent (92/100), better than 88% of ceramic grades.
Sustainability4
Producing a kilogram of Y2O3 SINT-99.9 takes about 280 MJ of energy and emits 22 kg of CO₂ — more than 71% of ceramic grades. Typical recycled content is 5%.
Manufacturability3
Y2O3 SINT-99.9's machinability is not recommended (6/100, better than 61% of ceramic grades).
Common Calculations2
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Y2O3 SINT-99.9
Is Y2O3 easy to machine?
Green/bisque machining is the economical route; fired parts require diamond grinding, lapping and ultrasonic/laser drilling — low toughness makes edge chipping the main risk.
Can Y2O3 be welded?
Not weldable; join by active-metal brazing (Ti/Ag-Cu), glass sealing or mechanical clamping with compliant gaskets.
Can Y2O3 be formed, bent or molded?
Formed by uniaxial/CIP pressing, slip or tape casting and injection moulding of 99.9 % powder, then sintering at 1600–1800 °C; HIP or vacuum sintering with ZrO2/La2O3 aids gives transparency.
What surface finishes work on Y2O3?
Diamond lapping and CMP give optical polish (Ra < 5 nm); plasma-sprayed or aerosol-deposited Y2O3 layers are the standard finish on semiconductor chamber hardware.
Y2O3 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Ostoichiometric oxygen | 21.1 – 21.4 | 21.26 |
| other rare earths (Ho, Er, Dy, Tb)typical 99.9–99.99 % purity residuals | ≤ 0.05 | 0.01 |
| SiO2+Fe2O3+CaOnon-RE impurities | ≤ 0.05 | 0.02 |
| Yas Y2O3, cubic bixbyite structure | ≥ 78.4 (balance) | — |
Y2O3 SINT-99.9 — frequently asked
What is Y2O3 SINT-99.9 used for?
Y2O3 SINT-99.9 is typically used for zirconia stabilizer dopant, IR-transparent optical windows, laser gain-media hosts and plasma-resistant chamber coatings. In short: halogen-plasma resistant oxide; stabiliser for tetragonal zirconia; refractory to 2000 °C.
Is Y2O3 SINT-99.9 easy to machine?
Not especially — machinability is rated not recommended (6/100, better than 61% of ceramic grades). Green/bisque machining is the economical route; fired parts require diamond grinding, lapping and ultrasonic/laser drilling — low toughness makes edge chipping the main risk.
Can Y2O3 SINT-99.9 be welded?
Not weldable; join by active-metal brazing (Ti/Ag-Cu), glass sealing or mechanical clamping with compliant gaskets.
What surface finishes work on Y2O3 SINT-99.9?
Diamond lapping and CMP give optical polish (Ra < 5 nm); plasma-sprayed or aerosol-deposited Y2O3 layers are the standard finish on semiconductor chamber hardware.
Can Y2O3 SINT-99.9 be formed, bent or molded?
Formed by uniaxial/CIP pressing, slip or tape casting and injection moulding of 99.9 % powder, then sintering at 1600–1800 °C; HIP or vacuum sintering with ZrO2/La2O3 aids gives transparency.
What is the maximum service temperature of Y2O3 SINT-99.9?
Y2O3 SINT-99.9 is rated for continuous use to about 2,000°C (3,632 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- Engineered Materials Handbook Vol. 4: Ceramics and Glasses — ASM International (1991)
- CRC Handbook of Chemistry and Physics (properties of Y2O3) — CRC Press (2020)
- Yttria (Y2O3) technical ceramic and crucible data — CoorsTek / Kyocera / Ferrotec (2023)
- Transparent polycrystalline yttria optical ceramic property data — Konoshima / Optical ceramics literature (2020)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.