Silica Bricks For Glass Furnace Crown And Breast Walls

Key Features of Silica Bricks for Glass Furnaces:

1. High-Temperature Volume Stability:
   Silica bricks maintain structural stability at high temperatures, with minimal deformation even under fluctuating thermal conditions. Their high refractoriness under load (RUL) and low creep rate ensure that glass furnaces remain stable at 1600°C without structural distortion.

2. Non-Contaminating to Molten Glass:
   The primary composition of silica bricks is SiO₂. Even if small fragments or molten droplets form on the surface during use, they do not affect the quality of the molten glass.

3. Chemical Corrosion Resistance:
   Silica bricks used in the upper structure of glass furnaces are exposed to R₂O-containing vapors from the raw materials. These bricks develop a smooth alteration layer on their surface, reducing the rate of corrosion and offering protective benefits.

4. Lightweight with Low Bulk Density:
   Silica bricks consist of 45% cristobalite, 50% tridymite, 1–2% glass phase, and less than 0.5% residual quartz. They have a low fusion index (<0.5%, 2R₂O + Al₂O₃). These properties not only reduce the overall furnace weight but also contribute to a furnace crown lifespan exceeding 10 years.

Minimizing Mortar Joints:
Silica bricks’ durability can be compromised by erosion along mortar joints rather than by the bricks themselves. To mitigate this, mortar joint width should not exceed 1.5 mm, and dimensional tolerances should remain within 0.5 mm.

Preventing "Mouse Holes":
Mouse holes, a common issue in silica brick applications, form due to:

• Furnace gas leakage.
• Deposition of Na₂O in brick joints.
• Erosion of silica bricks by Na₂O.
• Flow of corrosion by-products, leading to expanded cavities and crown damage.

To counter this, sealing and insulation layers can be applied behind the silica bricks. This adjustment ensures the condensation temperature range of alkali vapor (954–788°C) falls within the sealing material, preventing condensation in the brick joints. This method effectively avoids mouse holes, significantly extending the crown's service life.

Why Choose Silica Bricks for Glass Furnace Crowns and Breast Walls?
Silica bricks offer outstanding resistance to alkali vapors, high refractoriness under load, excellent creep resistance, and durability against erosion and thermal damage.

How Much Do Silica Bricks for Glass Furnaces Cost?
As a leading refractory materials manufacturer, Zhengzhou Rongsheng produces a wide range of silica bricks. These products are trusted by many glass furnace operators for their crowns and breast walls, offering long service life and high cost-effectiveness.

For pricing and inquiries, feel free to contact us at https://www.bricksrefractory.com