Overview
Cenosphere refractory materials are derived from fly ash cenospheres, hollow ceramic microspheres produced during coal combustion. These materials are prized in industrial applications for their unique combination of low density and high thermal resistance. Composed primarily of silica (SiO₂) and alumina (Al₂O₃), cenosphere refractories exhibit exceptional stability in temperatures up to 1,600°C. Their spherical structure and hollow interior contribute to superior insulation properties while maintaining mechanical strength.
Physical and Chemical Properties
The material's density ranges from 0.4 to 0.8 g/cm³, significantly lower than traditional refractory materials. This lightweight characteristic reduces structural load in high-temperature installations. Chemically inert, cenospheres resist corrosion from acids, alkalis, and molten metals. Their thermal conductivity typically measures 0.1–0.2 W/(m·K), making them among the most efficient insulating materials for extreme heat applications.
Main Applications
In steel manufacturing, cenosphere refractories line ladles and tundishes, protecting equipment from molten metal. The petrochemical industry uses them in cracking furnaces and reformer linings where temperatures exceed 1,000°C. Construction applications include fireproof boards and high-temperature pipe insulation. When mixed with binders, they form lightweight castables that maintain structural integrity under thermal cycling.
Safety and Storage
While non-toxic, the fine powder requires handling with dust masks and proper ventilation to prevent respiratory irritation. Storage should be in moisture-proof packaging to maintain flowability. Fire safety is excellent as the material is inherently non-combustible. However, thermal shock resistance varies by formulation—sudden temperature changes above 800°C may cause micro-fractures in some grades.
B2B Procurement Guide
Key specifications to evaluate include Al₂O₃ content (30–70% for most industrial grades), particle size distribution (typically 10–300 microns), and crush strength (≥5 MPa for structural applications). Bulk purchasing (20+ tons) often reduces costs by 15–20%. Verify supplier certifications for consistent quality, particularly for critical applications like aerospace or nuclear insulation where trace element content matters.
Related Manufacturers
- 主营：海泡石、矿物纤维、绿沸石、漂珠、滑石粉、蛭石、金刚砂、膨润土、硅灰、核桃壳粒、石英粉、小石子、云母粉、云母片、增碳剂、珍珠岩、玻璃纤维、木粉、石棉绒、绿沸石粉、绿沸石颗粒、木质纤维、膨胀珍珠岩颗粒、云母矿、石英砂
- 主营：高铝砖、粘土砖、耐火球、浇注料、耐火泥、轻质保温砖、莫来石刚玉砖、氧化铝空心球砖、耐火砖
- 主营：玻璃鳞片、高岭土、玻璃粉、膨润土、滑石粉、铝矾土、硅灰、萤石粉、沉淀硫酸钡、重钙、轻钙、硅藻土、珍珠岩、玻璃微珠、重晶石粉、S95矿粉、透明粉、煅烧高岭土、玻璃砂、云母粉、木炭、硅酸铝粉、长石粉、火山石、贝壳粉
- 主营：漂珠、膨润土
- 主营：杨木粉、云母粉、蛭石粉、空心漂珠、膨润土、电气石、莫来砂、硅藻土、碳酸钙、石英砂、有机覆盖物、80目锯末、云母20目、碳粉200目、防火材料、高岭土、叶腊石粉、沸石、海泡石粉、橡胶涂料、膨胀蛭石、油田堵漏剂、火山石粉、重晶石粉、珍珠岩粉
- 主营：水晶盐、草坪沙、氛围灯、漂珠、杨木粉、摩擦片、炭黑粉、金刚砂、乳胶漆、玻璃砂、发光石、白砂子、贝壳沙、网红沙、小石子、灰钙粉、蛭石粉、石棉绒、核桃壳、透明粉、夜光石、金刚沙、喷砂机、硅微粉、火山石、云母粉
- 主营：石英砂、金刚砂、金刚砂地坪材料、漂珠、白云石、蛭石、云母、轻钙粉、重钙粉、重晶石粉、质感砂、鹅卵石、白沙子、火山石、方解石、高岭土、球场砂、草坪砂、石英砂滤料、滑石粉、膨润土、凹凸棒土、橡胶粉、陶土粉、麦饭石粉、石英粉
- 主营：珍珠岩、夜光石、海泡石、漂珠、火山石、云母粉、生石灰、彩砂、萤石粉、硅藻土、铁粉、石英砂、蛭石、石棉绒、麦饭石球、复合岩片、生物质颗粒、配重铁砂、麦饭石、萤石矿、白沙子、发光石、夜光粉、重晶石粉
- 主营：云母、蛭石、铁粉、漂珠、果壳、钙粉、炭黑、滑石粉、高岭土、膨润土、麦饭石、木粉、珊瑚石、火山石、硅藻土
- 主营：硅藻土、电气石/粉、氧化铁颜料、漂珠、远红外粉、火山石粉、橡胶颗粒、硅灰石粉、陶粒、颜料、沸石、彩砂、膨润土、海泡石/纤维、火山石、金刚砂、岩片、滑石粉、黏土、白炭黑
- 主营：氧化铝、海泡石、刹车片、漂珠、矿物纤维、重晶石粉、冶金铸造、防火涂料、材料冶金、蛭石颗粒
- 主营：胶粘石、夜光粉、透水地坪、漂珠、夜光石头、夜光鹅卵石、造景夜光灯石、彩色石子、金刚砂、石英砂、彩砂、夜光漆、陶瓷颗粒、玻璃砂、玻璃微珠、蛭石、碎石、卵石、重钙粉、轻钙粉、玉石、烧结彩砂、彩色金刚砂、珍珠岩板、卵石切片、轻质彩砂
- 主营：硅藻土粉、白云石粉、贝壳粉、耐火材料、高岭土、滑石粉、石英砂、金刚砂、碳酸钙、玻璃微珠、石墨粉、远红外粉、石英粉、麦饭石粉、沸石粉、重钙粉、轻钙粉、高纯负离子液、膨润土、赤石脂粉、鹅卵石雨花石、彩色石子、活性白土、膨胀石墨、硅酸锆
- 主营：磁粉、碳酸钙、沸石粉、漂珠、介质粉、凹凸棒土、硅藻土、红土黄土、膨润土、粉煤灰、石英砂、膨润土猫砂、矿渣粉、硅灰硅微粉、活性白土、萤石粉、高岭土、珍珠岩粉、陶土、铁砂、贝壳粉、远红外粉、煤粉、花生饼、木粉、钛白粉
- 主营：电气石、高岭土、滑石粉、粉煤灰漂珠、火山石、氧化铁颜料