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Sialon ULTRA™ Thermocouple Protection Tubes – Up to 1600 mm Length, 1250°C in Air, 1400°C Controlled Atmosphere, 1-Year Warranty
Sialon ULTRA™ Thermocouple Protection Tubes (sheaths) are premium advanced silicon nitride-based ceramics (Si₃Al₃O₃N₅) designed for reliable, long-life temperature measurement in the non-ferrous industry. They excel in both direct and indirect sensing in molten aluminium and other non-ferrous metals – ideal for furnace walls/roofs, low-pressure die-casting machines (e.g. aluminium wheel production), launders and pouring troughs.
New option: lengths up to 1,600 mm (63 inches). Maximum operating temperature is 1,250 °C in air and up to 1,400 °C in controlled atmosphere. The unique Sialon composition delivers superior thermal shock resistance, high impact toughness, chemical inertness, zero water absorption and excellent non-wetting properties – far outperforming aluminium titanate or standard silicon nitride in aggressive molten-metal environments.
Available in four premium grades (ULTRA-001 to ULTRA-004) with outstanding mechanical and thermal properties:
- 부피 밀도: 3.1–3.3 g/cm³
- 수분 흡수율: 0 %
- 굽힘 강도: 580–1,020 MPa
- 비커스 경도: 12.7–15.0 GPa
- 파괴 인성: 4–7 MPa·m¹/²
- 영률: 270–300 GPa
- Thermal conductivity: 23–54 W/(m·K)
- 열충격 저항: 550–900 °C
- Volume resistivity: >10¹⁴ Ω·cm
Since 1986, Sialon thermocouple sheaths have been the preferred choice for foundries requiring precise temperature control, minimal maintenance and maximum reliability. They integrate perfectly with Sialon immersion heaters, riser tubes and degassing systems. View Sialon Thermocouple Protection Tubes – custom lengths, diameters and mounting options available. Standard 1-year (12-month) warranty against chemical attack in molten aluminium.
| 재료 데이터 시트 | Sialon (Si3Al3O3N5) | ||||
대표적인 Sialon ULTRA™ 등급 |
ULTRA-001 | ULTRA-002 | ULTRA-003 | ULTRA-004 | |
| 부피 밀도 | g/cm3 | 3.2 | 3.1 | 3.3 | 3.2 |
| 수분 흡수율 | % | 0 | 0 | 0 | 0 |
| 굽힘 강도 | MPa | 580 | 900 | 1,020 | 790 |
| 비커스 경도 HV1 | GPa | 13.9 | 12.7 | 15.0 | 13.8 |
| 파괴 인성 (SEPB) | MPam1/2 | 4 ~ 5 | 6 ~ 7 | 7 | 6 ~ 7 |
| 영률 (탄성계수) | GPa | 290 | 270 | 300 | 290 |
| 푸아송 비 | – | 0.28 | 0.28 | 0.28 | 0.28 |
| 선형 열팽창 계수 (40 – 800 °C) 팽창 |
×10-6/℃ | 3.2 | 3.4 | 3.3 | 3.5 |
| 열전도율 (20℃) | W/(m·K) | 25 | 23 | 27 | 54 |
| 비열 | J/(g·K) | 0.64 | 0.66 | 0.65 | 0.66 |
| 내 열 충격성 | ℃ | 550 | 800 | 800 | 900 |
| 체적 저항률 (20℃) | Ω·cm | >1014 | >1014 | >1014 | >1014 |







