Method for detecting thermal shock resistance of porous ceramic

Abstract

The invention relates to a method for detecting thermal shock resistance of a porous ceramic. The method comprises the following steps: cutting and processing a porous ceramic to obtain a sample, wherein the sample has a width of 8+ / -0.2mm, a thickness of 6+ / -0.2mm, a length of more than or equal to 70mm, and the parallelism of an upper surface and a lower surface of less than 0.02mm, the size ofthe sample has universal applicability to materials with different structures, and the problem that the existing sample size has large deviation of test values for materials with different structurescan be solved; clamping the sample on a clamp of a testing machine; detecting the thermal shock resistance of the sample by a four-point bending method to obtain test data of the thermal shock resistance of the sample; repeating the steps and gradually increasing the thermal shock temperature until the bending strength in the measured test data falls beyond product requirements or is damaged to such an extent that a bending test is difficult to perform; and obtaining thermal shock resistance data of the porous ceramic according to the test data and the thermal shock temperature. The method isscientific, reasonable, simple, feasible, fast and effective, and low in cost.

Description

technical field [0001] The invention relates to the technical field of ceramic mechanics detection, in particular to a detection method for thermal shock resistance of porous ceramics. Background technique [0002] Porous ceramic material is a kind of porous ceramic material with open pore size and high open porosity, which is made of corundum sand, silicon carbide, cordierite and other high-quality raw materials as main materials, and is prepared by molding and high-temperature sintering process. , high pressure, anti-acid, alkali and organic medium corrosion, good biological inertness, controllable pore structure and high opening porosity, long service life, good product regeneration performance, etc., can be applied to precision filtration and filtration of various media Separation, high-pressure gas exhaust silencer, gas distribution and electrolytic diaphragm, etc. [0003] First of all, due to the different preparation process, the pore structure is also different, th...

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Problems solved by technology

During the bending strength test, it was found that due to the inappropriate sample preparation specifications and the influence of sample processing accuracy and other factors on materials of different structures, the bending strength test results obtained from the detection had large deviations; secondly, the currently widely used porous The thickness of ceramic filter tubes, filter plates and other products is mostly about 10mm, and it is difficult to prepare large-sized test samples (sample) because of the radian, so only the cross-sectional size below 10mm can be used; third, the size is in the bending strength test. In any cross-section of the sample, there are both shear force and normal stress at the same time, and they are respectively related to the magnitude of the bending moment. As the ratio of span and thickness increases, the shear force of the sample will decrease. An important factor affecting the bending strength is the span-thickness ratio. The current bending strength test size widely used in ceramic industry standards is 3×4×40mm (GB / T 6569), 20×20×130 (HG / T 3210), 1:1×120mm (GB / T 4741), 10×20×120mm (GB / T 1964), most of them are too large in size and difficult to prepare. If a small size is used, such as 3×4×40mm, the The pore structure has a great influence on the laboratory data, and the obtained data is more discrete, which cannot better reflect the actual situation of the bending strength of porous ceramic materials

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