2.24 Compressive strength testing The testing instrument is CMT series computer-controlled electronic universal material testing machine.
The sample size is a cylinder with a diameter of 20±0.5mm and a height of 20±1mm. Five samples per group. The test specimens are produced by the same process as the product production. The pressing surface of the sample is ground flat, and the two pressing surfaces are kept parallel to each other.
(1) Measure the diameter of the upper and lower pressure surfaces of the sample, accurate to 0.01cm.
(2) Place the sample in the center of the lower platen of the testing machine, and apply pressure evenly at a speed of 20 ± 5 kg/cm2 per second, until the pressure gauge pointer is reversed and the test is stopped immediately.
2 where: Rc—the compressive strength of the Compression test of cff filter, the compression area of the sample (mm2) d2, the diameter of the upper and lower compression surfaces of the sample (mm) P—the pressure at which the sample breaks (N)
22.5 Testing of Flexural Strength
The testing instrument is CMT series microcomputer-controlled electronic universal material testing machine. Specimen specifications are 10±1mm high, 20±1mm wide and 120±2mm long. 5 samples per group. Manufactured using the same process as the production of the finished product. The surface of the sample is ground flat.
(1) Before the test, remove the impurity particles on the surface of the sample
(2) Put the sample in an oven, dry it at 110±5℃ for 2 hours, and then put it in a desiccator to cool it to room temperature.
(3) Adjust the distance between the supports to 50mm, put the sample on the support, apply a load at a speed of 2±0.5N/S until the sample is damaged, and read the load number at the time of failure
(4) Measure the thickness and width of the broken part of the sample, accurate to 0.01mm, and the calculation formula is as follows
Rr—Bending strength of porous ceramic filter (MPa) P—Break load of the test specimen (N) L—The distance between the supporting edges (mm) b—The width at the fracture of the sample (mm) h—The fracture of the sample Thickness(mm)