In high-temperature industrial sectors such as steel smelting, aerospace and semiconductor manufacturing, the temperature resistance of materials has always been a key bottleneck constraining technological breakthroughs. Traditional refractory materials are prone to thermal shock cracking and strength degradation at temperatures above 1,200°C, whereas new ceramic fibre boards, with their ability to withstand sustained temperatures of 1,400°C and excellent thermal shock resistance, are redefining the technological boundaries of high-temperature industries in what amounts to a ‘materials revolution’. Today, Mu Yi will analyse how this innovative material is rewriting industrial standards from three perspectives: technical principles, application scenarios and industry impact.
I. Technological Breakthrough: A Paradigm Shift from ‘Passive Temperature Resistance’ to ‘Active Temperature Control’
Traditional refractory materials (such as clay bricks and high-alumina bricks) rely on chemical bonds to directly withstand high temperatures; however, when temperatures exceed 1,200°C, accelerated grain boundary slippage and microcrack propagation lead to rapid material failure. In contrast, the new ceramic fibre board achieves a qualitative leap in heat resistance through three core technologies:
1. Nanocrystalline whisker-reinforced structure: creating a ‘high-temperature buffer layer’
Based on a ternary aluminium oxide–silicon dioxide–zirconium oxide system, ceramic whiskers with diameters of 50–200 nm are synthesised using the sol–gel method. These whiskers form a three-dimensional network structure within the matrix; when subjected to thermal shock, the nanoscale voids at the grain boundaries can absorb more than 30 per cent of the thermal stress, increasing the material’s thermal shock resistance from 10–15 cycles in conventional materials to over 50 cycles (as tested in rapid cooling from 1,000 °C to room temperature).
2. Low thermal conductivity design: breaking the ‘heat conduction chain’
By controlling the fibre diameter (3–5 μm) and porosity (85–90%), the material’s thermal conductivity is maintained at 0.12–0.18 W/(m·K), which is just one-tenth that of conventional refractory bricks. In an application involving the hot blast duct of a blast furnace at a steelworks, this material reduced the outer wall temperature from 320 °C to 85 °C, achieving a 38 per cent improvement in energy efficiency whilst extending the service life of the equipment.
3. Phase-change energy storage coating: Achieving ‘intelligent temperature control’
A layer of lanthanum zirconate (La₂Zr₂O₇) phase-change material, with a melting point of 2,450 °C, is deposited onto the surface of the fibreboard. This material undergoes a solid–liquid phase transition at 1,400 °C, absorbing a large amount of latent heat (approximately 220 kJ/kg). Test data show that the coating reduces surface temperature fluctuations by 60 per cent, effectively preventing structural failure caused by localised overheating.
II. Application Scenarios: Comprehensive Coverage from High-Temperature Environments to Precision Manufacturing
1. Metallurgical Industry: The Key to Extending the Service Life of Blast Furnaces
During the refurbishment of a hot blast duct at a Baowu Group blast furnace, the replacement of traditional aluminium silicate fibre felt with new ceramic fibre boards achieved the following breakthroughs:
Increased temperature resistance: Raised from 1,250°C to 1,420°C, meeting the requirements of the oxygen-enriched blast process;
Extended service life: from 18 months to 5 years, reducing the frequency of furnace shutdowns for maintenance;
Optimised energy efficiency: hot blast temperature increased by 50 °C, reducing energy consumption per metric tonne of pig iron by 15 kgce.
2. Aerospace: The ‘Thermal Shield’ for Rocket Engines
In applications within the thermal insulation layers of the combustion chambers of the Long March series of rockets, this material addresses the challenges of high-temperature environments through the following properties:
Abrasion resistance: Following 3,000-second plasma wind tunnel testing, the linear ablation rate was only 0.02 mm/s (compared to 0.08 mm/s for traditional carbon-carbon composites);
Low-density advantage: With a density of 1.2 g/cm³, which is only one-sixteenth that of tungsten-based materials, it reduces the structural weight of the engine;
Radiation resistance: Reflectivity of radiation in the 200–2,000 nm wavelength range exceeds 95 per cent, effectively reducing the thermal load.
3. Semiconductor Manufacturing: The ‘Cornerstone of Temperature Control’ for Wafer Growth
In 12-inch monocrystalline silicon growth furnaces, ceramic fibre boards serve as core components of the thermal field, delivering three major technological upgrades:
Temperature uniformity: Radial temperature difference < 2 °C, representing a 50 per cent improvement over graphite materials;
Purity control: Metal impurity content < 0.1 ppm, meeting the requirements of advanced manufacturing processes;
Lifespan breakthrough: 2,000 hours of continuous operation without performance degradation, three times that of traditional materials.
III. Impact on the Industry: Driving the Transition of High-Temperature Industries towards ‘Green and Smart’ Operations
1. The Energy Efficiency Revolution: An ‘Invisible Lever’ for Reducing Global Industrial Energy Consumption
According to calculations by the International Energy Agency (IEA), if this material were to be adopted across the board in global high-temperature industries, the following annual reductions could be achieved:
Standard coal consumption: approximately 120 million tonnes (equivalent to a reduction of 310 million tonnes of CO₂ emissions);
Water consumption: savings of approximately 8.5 billion cubic metres due to reduced cooling requirements;
Metal and mineral extraction: a reduction of approximately 240 million tonnes in iron ore mining due to extended equipment service life.
2. Upgrading Manufacturing Models: The Leap from ‘Experience-Driven’ to ‘Data-Driven’
The new ceramic fibre boards are equipped with built-in temperature sensors and RFID chips, enabling real-time monitoring of:
Surface temperature distribution (accuracy ±1 °C);
thermal stress conditions (via acoustic emission technology);
remaining life prediction (based on machine learning algorithms).
Following implementation at a certain automotive engine plant, the accuracy of equipment failure prediction rose to 92 per cent, whilst unplanned downtime was reduced by 75 per cent.
3. Reconstruction of the Standards Framework: Defining the Benchmark for Next-Generation High-Temperature Materials
This breakthrough has driven revisions to several international standards:
ISO 13506-2023: Increased the thermal shock resistance requirement for refractory materials from 15 cycles to 50 cycles;
ASTM C1136-24: Added a new temperature resistance classification for temperatures above 1,400 °C;
GB/T 3003-2025: Introduction of performance testing methods for phase-change energy storage coatings.
IV. Technical Challenges and Future Directions
Although the new ceramic fibre board has been commercialised, two major bottlenecks remain to be overcome:
Cost of large-scale production: The current whisker synthesis process is energy-intensive, resulting in a unit price that is 3–5 times that of traditional products;
Environmental adaptability: Long-term stability in environments subject to intense radiation (e.g. the nuclear industry) or severe corrosion (e.g. waste incineration) requires further validation.
Future research and development will focus on:
Biotemplating method: Utilising biomaterials such as silk protein to induce oriented whisker growth, thereby reducing energy consumption;
Gradient functional design: Achieving precise control over composition, structure and performance through 3D printing;
Self-repair technology: Introducing microencapsulated repair agents to enable autonomous crack healing.
Conclusion: Material innovation drives the leap forward in industrial civilisation
From the Bronze Age to the Silicon Age, humanity’s ability to control high temperatures has always been a hallmark of civilisational progress. The breakthrough in new ceramic fibre boards not only resolves the ‘bottleneck’ challenges facing high-temperature industries but also ushers in a new era of ‘environmental intelligence’. When 1,400°C is no longer the upper limit of a material’s temperature resistance, and when every blast furnace and every engine can achieve ‘precise temperature control’, we are witnessing the dawn of a more efficient, cleaner and smarter industrial era. For enterprises, embracing this materials revolution means embracing the core competitiveness of the next decade.
