First, detection related
Foam ceramics are porous ceramic products with porosity of up to 70%~90% and volume density of 0.30-0.6g/cm³. They have a three-dimensional network framework and interpenetrating pore structure.
In addition to the properties of general ceramics such as high temperature resistance and corrosion resistance, foam ceramics are also characterized by low density, elevated porosity, large specific surface area and strong self-interference to fluids.
Foam ceramics can usually be divided into open (mesh) ceramic materials and closed ceramic materials, depending on whether there is a solid wall in each hole.
If the solid forming the foam body is contained only in the pore edges, it is called an open-hole ceramic material, and the holes are connected to each other.
If a solid wall is present, the foam is called a closed-cell ceramic material, in which the holes are separated by a continuous ceramic matrix.
The application fields of foam ceramics are involved from metal to chemical industry, environmental protection, energy saving and so on, and technologically, from metal molten filter aluminum alloy to elevated temperature molten steel refining filter.
However, due to the restriction of economic and technical conditions, the application of ceramic foam filter in the metallurgical casting industry has only begun. With the improvement of the requirements for the purity and performance of metal products, the foam ceramic filtration technology and its product quality are becoming more and more significant. This requires us to examine it to understand the specific performance.
Two, casting with ceramic foam filter detection
Casting with ceramic foam filter detection, we can according to the national recommended standard GB/T 25139-2010 "casting with ceramic foam filter".
GB/T 25139-2010 will be used for casting foam ceramic filter according to the temperature tolerance is divided into G, T, L three types, the tolerance temperature is ≤1700℃, ≤1500℃, ≤900℃.
In addition, according to the hole density is divided into 06PPI, 10PPI, 15PPI, 20PPI four categories.
In terms of testing items, the physical properties are the key evaluation items for casting foam ceramic filter. Physical properties of the main detection volume density, porosity, compressive strength at room temperature, thermal shock resistance, elevated temperature Kang bending strength.
Three, exterior wall insulation foam ceramic detection
The test standard for exterior wall insulation foam ceramics is: GB/T 33500-2017 Exterior Wall Insulation Foam Ceramics.
Exterior wall insulation foam ceramic is classified according to dry density, mainly S type, M type, L type.
Physical performance test items mainly include dry density, bulk water absorption, compressive strength, flexural strength, freezing resistance, radioactivity, combustion performance, thermal conductivity, etc.
Four, ceramic foam filter detection
Foam ceramic filter detection according to the standard: JC/T 895-2001 "foam ceramic filter".
Ceramic foam filters are classified based on hole density. Code for 10P, 20P, 30P, 40P four categories.
In terms of physical and chemical properties, the foam ceramic filter is mainly used to detect pore density, porosity, bending strength and compression strength at room temperature.
The above are the most common three kinds of foam ceramic products: casting foam ceramic filter, exterior wall insulation foam ceramic, foam ceramic filter testing standards and testing items related to knowledge.
In the actual inspection, we need to issue a qualified ceramic inspection report, normally to entrust a third party inspection institution to determine the performance of the product. And not only physical properties, product appearance quality, size and allowable deviation are within the scope of foam ceramic detection.
Of course, the supply and demand can also reach a negotiation, specify the test items to test.