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2025
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Refractory industry breathable bricks: core materials to resist high-temperature
Source： Innovation Materials
Release time：2025-03-17 11:01
Permeable bricks are indispensable refractory materials in high-temperature industries (such as iron and steel metallurgy, non-ferrous metal smelting). Their performance is directly related to equipment lifespan, production efficiency, and product quality. This article systematically analyzes the core knowledge of this subfield from aspects such as the definition, production process, performance characteristics, application fields, and industry development trends of permeable bricks.
I. Definition and Function of Porous Bricks
1. Definition
Porous bricks are refractory materials with high permeability. They are usually made from materials such as corundum, spinel, and alumina. They have a microporous or directional pore structure that allows gases to pass through but prevents liquid metal penetration.
2. Core Functions
Gas Transfer: In equipment such as steel ladles and electric furnaces, inert gases (such as argon) are blown in from the bottom to homogenize the steel composition and temperature, and remove inclusions.
High Temperature and Corrosion Resistance: Resistance to chemical corrosion and mechanical erosion from molten steel and slag at temperatures above 1600℃.
Thermal Shock Stability: Withstand rapid heating and cooling changes to prevent cracking and failure.
II. Production Process of Porous Bricks
The manufacturing of porous bricks requires a balance of permeability, strength, and corrosion resistance. The main process flow includes:
Raw Material Selection and Processing
Main Raw Materials: Electrofused corundum, sintered corundum, spinel, etc.
Additives: Binders (pure calcium aluminate cement), water reducers, etc.
Particle Size Distribution: Optimization of coarse, medium, and fine particle grading to ensure uniform structure.
Molding Process
Vibration molding.
High-Temperature Firing
Firing in a tunnel kiln or shuttle kiln at 1600-1800℃ to form a ceramic bond.
Key Point: Control the heating curve to avoid cracks and deformation.
Post-Processing
Permeability Test: Verify pore connectivity through gas flow testing.
Source: Luoyang Kechuang New Materials Co., Ltd.: https://www.kcnh.com/
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