The service life of ceramic fiber shaped components generally ranges from 1 to 10 years. The actual lifespan depends on operating temperature, working cycle frequency, maintenance practice and material quality. A detailed analysis is as follows:

1. Key Influencing Factors

Operating Temperature

• Medium & low temperature (≤1000°C)Standard alumina ceramic fiber shapes can last 3–5 years. If daily operation lasts no more than 4 hours and rapid heating/cooling shocks are avoided, the service life can be extended to 5–6 years.
  
• Medium & high temperature (1000–1400°C)High-alumina ceramic fiber shapes have a service life of 1.5–3 years. Continuous operation at 1300–1400°C accelerates aging and shortens lifespan to 1–2 years.
  
• High temperature (1400–1600°C)Mullite ceramic fiber shapes serve 1–2 years. Under frequent start-stop cycles or near-limit temperature close to 1600°C, the service life may drop to 8–12 months.
  
• Temperature load noteContinuous operation near the maximum rated temperature can reduce service life by 30%–50%. It is recommended that the normal working temperature stays 50–100°C below the fiber’s temperature rating.
  

Working Cycle Frequency

• Intermittent operation: For batch furnaces such as heat treatment furnaces, thermal stress fluctuation is mild, which helps extend the service life of ceramic fiber shapes.
  
• Continuous operation: Continuously running reactors in petrochemical plants keep fibers exposed to persistent high heat, resulting in a relatively shorter lifespan.
  

Maintenance Methods

• Regular cleaning: Remove dust inside the furnace monthly to prevent fiber erosion and accelerated aging caused by corrosive contaminants.
  
• Timely repair: Apply high-temperature binder promptly upon slight powdering to stop damage from spreading.
  
• Standard operation: Allow the furnace to cool naturally below 200°C before opening the door after use. This prevents sharp hot air loss that causes fiber shrinkage and cracking.
  

Material Quality

• Premium raw materials: Shapes made from high-purity ceramic fiber bulk (such as zirconia-containing grades) feature superior resistance to corrosion and gas erosion for longer service life.
  
• Surface treatment: Shapes coated with surface hardener or refractory mortar gain better corrosion and scour resistance, extending their usable life.
  

2. Typical Application Scenarios & Lifespan Reference

Sight Holes and Burner Blocks for Industrial Kilns

Service life: 3–5 years (medium-low temperature) down to 1–2 years (high temperature). Reason: Sight holes and burner blocks are in direct contact with flame under sustained high heat. Lifespan can be improved by adopting zirconia-containing ceramic fiber shapes together with regular maintenance.

Collection Troughs and Launders for Aluminum Industry

Service life: 2–4 years. Reason: Troughs and launders withstand molten aluminum at around 700°C plus corrosive surroundings. High-grade ceramic fiber shapes are suitable for these conditions.

FCC Units in Petrochemical Industry

Service life: 1–3 years. Reason: FCC units run above 900°C with corrosive gas, which demands excellent erosion resistance of fiber materials.

Civil & Industrial Heating Devices

Service life: 5–10 years (low-temperature conditions). Reason: Heating devices operate below 600°C with low usage frequency, so fiber aging proceeds slowly.