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Zirconia & High-Alumina Fiber Insulation Materials

-- Steady & Reliable Manufacturer --

Introduction

Zirconia and high-alumina fibers occupy the pinnacle of the refractory fiber performance pyramid. Zirconia fibers (ZrO₂ content typically ≥ 67%, often stabilized with Y₂O₃ or CaO) can withstand continuous operating temperatures up to 1800 °C and resist chemical environments — strong acids, molten metals, and reducing atmospheres — that would degrade both alumina-silica and even pure alumina fibers. High-alumina fibers in the 67–80% Al₂O₃ range fill the performance gap between standard aluminum silicate and pure polycrystalline alumina fibers.

These materials are not general-purpose bulk insulation. They are specified when a standard ceramic fiber solution has already been tried and found inadequate, or when the process chemistry dictates a material with no silica content at all. Typical buyers are research institutions, aerospace contractors, specialty metallurgy operations, and advanced ceramics producers working at the limits of current thermal process technology.

Nengcheng supplies zirconia-enhanced fiber in blanket, board, and vacuum-formed shape configurations, as well as high-alumina fiber (67–80% Al₂O₃) as a cost-performance step between standard aluminum silicate and full polycrystalline alumina. Both product lines are sourced from batch-tested raw materials with XRF certification of chemistry.

Specification

Parameter Value
Zirconia Fiber — ZrO₂ Content ≥ 67% (standard zirconia grade); ≥ 95% (high-purity grade)
Zirconia Fiber — Stabilizer Y₂O₃ or CaO (grade-dependent)
Zirconia Fiber — Service Temp Up to 1800 °C continuous
Zirconia Fiber — Bulk Density (blanket) 96–160 kg/m³
High-Alumina Fiber — Al₂O₃ Content 62–80%
High-Alumina Fiber — Service Temp 1430 °C – 1500 °C
High-Alumina Fiber — Bulk Density (blanket) 96–192 kg/m³
Thermal Conductivity @ 1000 °C (zirconia blanket) ≤ 0.22 W/(m·K)
Chemical Resistance (zirconia) Strong acids, alkali metals, reducing atmospheres
Available Forms Blanket, board, vacuum-formed shapes, paper

Application

  • Zirconia fiber — ultra-high-temperature furnaces: hot-face lining in furnaces operating above 1600 °C, including sintering furnaces for advanced ceramics, SiC, and silicon nitride
  • Zirconia fiber — corrosive atmosphere processes: insulation in furnaces processing reactive metals (titanium, hafnium, niobium) where silica fiber contamination would compromise product purity
  • Zirconia fiber — molten glass contact: fiber board used as parting material in contact with molten optical glass where silica dissolution must be avoided
  • High-alumina fiber — step-up from standard Al-Si fiber: used when 1260–1430 °C temperature ratings prove insufficient but the full cost of polycrystalline alumina is not justified
  • High-alumina fiber — atmosphere furnaces: enhanced resistance to reducing and inert atmospheres compared to standard Al-Si fiber grades
  • Research & defense: thermal protection systems, rocket motor test cell insulation, and reentry vehicle TPS (thermal protection system) simulation rigs

Advantage

  • 1800 °C continuous service (zirconia): the highest continuous-use temperature of any commercially available fibrous insulation — enables processes simply not possible with other fiber types
  • Silica-free chemistry: zirconia fiber contains no SiO₂, eliminating silica vapor contamination of sensitive high-temperature processes
  • Exceptional chemical resistance: zirconia is stable in environments that attack both silicate and alumina fibers, including strong acids and molten metal splashes
  • Y₂O₃ stabilization prevents phase transformation: yttria-stabilized zirconia fibers do not undergo the monoclinic-to-tetragonal phase transition that would otherwise cause cracking on thermal cycling
  • High-alumina grade bridges cost-performance gap: 67–80% Al₂O₃ fiber offers significantly better high-temperature performance than standard Al-Si fiber at a fraction of the cost of full polycrystalline alumina
  • Batch chemistry certification: every batch XRF-tested and certified — critical for aerospace and research applications with traceability requirements

Core Features

  • ZrO₂ ≥ 67% (standard) or ≥ 95% (high-purity) verified by XRF on every production batch
  • Y₂O₃ or CaO stabilization system prevents destructive monoclinic phase transformation
  • High-alumina fiber (62–80% Al₂O₃) available as blanket, board, and loose wool
  • Zirconia-enhanced board suitable for direct hot-face use in furnaces to 1800 °C
  • All products supplied with batch chemistry certificate and physical property test data
  • Low shot content (< 5%) for zirconia grades — reduces risk of hard particle contamination
  • When should I choose zirconia fiber over polycrystalline alumina fiber?
  • Choose zirconia fiber when your process temperature exceeds 1700 °C, when you need silica-free insulation for purity reasons, or when the process involves strong acids or chemically reactive environments that attack alumina. For most industrial applications between 1600–1700 °C, polycrystalline alumina fiber is more cost-effective. Zirconia fiber is the right answer for the narrow set of processes at the absolute temperature and chemistry limits.
  • Does zirconia fiber crack on thermal cycling?
  • Pure zirconia (unstabilized) undergoes a monoclinic-to-tetragonal phase transformation at around 1100 °C that causes a volume change and cracking on repeated cycling. This is precisely why yttria or calcia stabilizers are added — they suppress the transformation, allowing the fiber to thermal cycle without structural damage. Always specify stabilized zirconia fiber for applications involving thermal cycling.
  • What is the difference between zirconia-enhanced ceramic fiber board and full-zirconia board?
  • Zirconia-enhanced boards contain alumina-silica fiber with ZrO₂ additions (typically 15–17% ZrO₂ by fiber chemistry), giving a service temperature of 1500–1600 °C. Full-zirconia boards are made from ≥ 67% ZrO₂ fiber and rated to 1800 °C. The zirconia-enhanced variant is significantly less expensive and suitable for the 1500–1600 °C range; full-zirconia is reserved for 1700–1800 °C applications.
  • Can high-alumina fiber be used in vacuum furnaces at 1500 °C?
  • Yes. High-alumina fiber (67–80% Al₂O₃) performs well in vacuum service up to its rated temperature. The reduced silica content compared to standard Al-Si fiber means less silica vapor at high temperature, which is beneficial for vacuum furnaces processing reactive materials. For temperatures above 1550 °C in vacuum, polycrystalline alumina or zirconia fiber is the appropriate choice.
  • Do you provide minimum order quantities for specialty zirconia fiber products?
  • Given the higher material cost and lower production volume of zirconia fiber products, minimum order quantities apply — typically 20 kg for loose wool, 5 m² for blanket, and 10 pcs for board. Contact our sales team for specific MOQ and lead time for your required grade and form. Samples (approx. 0.5 kg or 0.2 m²) are available for qualification testing.
Zhejiang Nengcheng Crystal Fiber Co., Ltd.
Zhejiang Nengcheng Crystal Fiber Co., Ltd.
Zhejiang Nengcheng Crystal Fiber Co., Ltd. was established in 2015. It is a professional enterprise that develops and produces ultra lightweight energy-saving high-temperature materials, and sells experimental electric furnaces, industrial electric furnaces, and non-standard customized electric furnaces. China Zirconia & High-Alumina Fiber Insulation Materials Manufacturers. The company adheres to the principle of "survival through quality, development through reputation" and upholds the business philosophy of "practicality, integrity, and efficiency". We are committed to providing comprehensive and high-quality equipment solutions for customers in industries such as ceramics, metallurgy, electronics, glass, and chemical engineering. We also provide services such as powder roasting, ceramic sintering, and high-temperature experiments to universities, research institutes, and industrial and mining enterprises. wholesale Zirconia & High-Alumina Fiber Insulation Materials Suppliers. At the same time, we are also striving to promote the strategic development of Nengcheng's lightweight, energy-saving, and environmentally friendly high-temperature alumina fiber in the field of new furnaces, and strive to become an internationally leading advanced high-temperature equipment industry service provider.

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