Refractory Cordierite Mullite Ceramic Push Setter Plate for Kiln Furnace

Max continuous working temperature: 1550–1600℃; melting point of mullite crystal: 1800℃ Ultra-low thermal expansion coefficient: 2.4–3.5×10⁻⁶/℃ (25–1000℃), close to silicon wafer, greatly reducing thermal stress cracking risk.Excellent thermal shock resistance: Survives rapid cooling-heating cycles from 1300℃ to room temperature without crack propagation; needle-shaped interlocking mullite crystals block crack extension efficientlyLow thermal conductivity: 0.28–0.40 W/(m·K) at 800℃, energy-saving thermal insulation performance.

2.2Chemical & Electrical Features

High chemical inertness: Resists erosion from molten glass, glaze liquid, weak acid & alkaline atmosphere, oxidation atmosphere

Excellent electrical insulation, low dielectric constant, suitable for high-temperature insulating substrates.Non-sticky with ceramic glaze, metal oxide powder, easy to clean after firing cycles. After high-temperature sintering at 1600–1700°C and precise grain boundary regulation, a tightly interlocked microscopic structure of corundum and mullite grains is formed. Fine post-processing such as cutting and polishing is then carried out to ensure accurate dimensional tolerance and flatness, meeting the assembly and use standards of precision high-temperature equipment.

3.Main Product Types & Specifications

3.1 Thin Precision Mullite Sheet

Thickness: 2–10 mm; customized length & width from 50×50 mm to 400×400 mm

Application: Electronic ceramic substrate, lab high-temperature test carrier, small precision sintering fixture

3.2 Hollow Perforated Mullite Slab

Evenly arranged through holes on the side wall, lighter weight, faster heat circulation, lower kiln energy consumption

Max service temp: 1380–1450℃; mainstream sizes 600×400×20 mm, 800×500×25 mm

3.3 Storage & Usage Notes

Store in dry ventilated warehouse to prevent long-term damp absorption; wet sheets need full pre-drying before kiln loading

Avoid violent impact during transportation and installation; edge chamfer design is recommended for heavy-load frequent cycle scenarios

Slow heating-up rate suggested for first-time use (≤100℃/h below 800℃) to eliminate internal moisture and micro stress

Do not contact strong hydrofluoric acid or molten alkali salt for long-term continuous operation, which will corrode mullite crystal structure.

4.Production Advantages of Mullite Sheet

4.1 Longer service life vs cordierite plates:

Higher refractoriness, less deformation under long high-temperature load, reduces kiln furniture replacement frequency. Uniform heating effect: Stable heat conduction, avoids uneven firing color difference of workpieces. Cost efficiency: Raw material cost lower than pure alumina or zirconia refractory, balanced performance-price ratio.It also features good electrical insulation at high temperatures, meeting the special functional requirements of electronic and electrical high-temperature equipment. All these properties ensure its long service life and stable operation in complex industrial environments.

4.2 Customizable lightweight hollow design:

Reduces kiln overall load, shortens heating-up time, cuts power/gas consumption.Low impurity precipitation: Will not pollute sintered products, meets strict quality standards for electronics and high-end precision ceramics. In the electronic ceramic and new material industry, they act as sintering trays and substrate supports for magnetic materials, fluorescent materials and precision electronic ceramics. Moreover, they are also ideal insulating and wear-resistant components for high-temperature power equipment.

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