The purpose of tapping refractory bricks with a small hammer is mainly to check their quality and durability. By tapping, different sounds can be heard to determine whether there are cracks or voids in the bricks. Generally speaking, bricks with crisp tapping sounds are of good quality, while those with dull sounds may have quality problems.
In addition, tapping can also be used to evaluate the density and uniformity of bricks, as well as whether the surface is hard. This helps ensure that refractory firebricks can withstand high temperatures and chemical erosion during use and maintain their stability and durability.
The quality inspection of refractory firebricks usually involves multiple aspects, including physical properties, chemical composition, microstructure, and refractory properties. The following are some common methods for testing the quality of refractory bricks:
Appearance inspection: Check whether the surface of the refractory brick is flat, with or without cracks, flaws or other damage.
Dimension measurement: Measure the dimensional parameters of the refractory firebricks, such as length, width, thickness, and diameter, to ensure that they meet the specified standards.
Density determination: The density of refractory fire bricks is calculated by measuring the mass and volume of the refractories bricks. Commonly used methods include water immersion and gas displacement.
Compressive strength test: The compressive strength of refractories bricks is tested by applying a certain pressure on them. Common methods include pressure testing machines and compression tests.
Water absorption rate determination: The amount of water absorbed by refractories bricks in a certain period of time is measured to evaluate their pore structure and water absorption performance.
Refractoriness test: Expose refractory fire bricks to high temperatures to observe whether they have ablation, deformation or cracks, and evaluate their refractory properties.
Chemical composition analysis: The content of the main components in fire bricks, such as alumina, aluminum silicate, etc., is detected through chemical analysis methods.
Microstructure observation: Use a microscope to observe the microstructure of refractory bricks and evaluate their grain size, crystal morphology, pore structure and other characteristics.
