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Sialon Heater Tubes for Aluminium Foundries – 20+ Grades, Up to 3 Years Service Life, Non-Wetting Protection for Immersion Heaters.
Sialon ULTRA™ Heater Tubes are the industry-leading immersion heater protection tubes for aluminium and non-ferrous foundries. Manufactured from advanced silicon nitride-based Sialon ceramics (Si₃Al₃O₃N₅), they offer exceptional thermal shock resistance (550–900 °C), non-wetting surfaces, low thermal conductivity and outstanding corrosion/erosion protection – outperforming cast iron, silicon carbide and aluminium titanate by up to 30 % longer life.
Customers routinely achieve 2–3 years of continuous operation with minimal cleaning. Perfect for protecting immersion heaters in ALPUR® TS15/TS35/TS55/TS75/TS90, SNIF®, Hertwich, G3 cc Line in-line degassers and Striko Westofen dosing systems. The unique Sialon composition (partial substitution of silicon by aluminium and nitrogen by oxygen) delivers superior properties compared to pure Si₃N₄, ensuring clean, closed dosing systems that prevent contamination and maintain highest metal purity.
Full technical specifications (ULTRA™ grades 001–004):
- 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
- 선형 열팽창 계수 (40–800 °C): 3.2–3.5 ×10⁻⁶/°C
- 열전도율 (20 °C): 23–54 W/(m·K)
- 열충격 저항: 550–900 °C
- 체적 저항률 (20 °C): >10¹⁴ Ω·cm
Since 1986, these heater tubes have been the preferred choice for foundries seeking maximum reliability, lowest maintenance and best price/performance ratio. They integrate perfectly with Sialon immersion heaters, riser tubes and degassing systems. View Sialon Heater Tubes – 20+ grades, custom lengths, diameters, flanges and mounting options available. Standard 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 |






