Comparison of several film measurement methods The hardness of the coating is measured by a microhardness tester, which is a very effective means. However, in the case of frontal measurement, a thinner coating is often encountered, and it is difficult to eliminate the influence of the deformation of the substrate during the measurement. When a small load is pressed in, the diagonal is difficult to measure accurately, which makes it difficult to measure the hardness. When measuring the side, although the agitator can avoid the influence of the deformation of the substrate, it is not applicable when the coating is thin. ABS Toilet Flush Panel features: ABS Toilet Flush Panel, Plastic Flush Plate, Dual Flush Panel, Toilet Flush Cover Plate Guangdong Fabia Intelligent Technology Co., Ltd , https://www.fabiaintelligent.com
The nanoindenter measures the microhardness, avoiding the measurement of the indentation length of the tinplate angle under an optical microscope, and the computer automatically records the indentation displacement, avoiding human error. For a few micron thick film coatings, its intrinsic hardness can be obtained. Moreover, studies by foreign scientists have shown that [5], when the centrifuge uses a nanoindenter to measure the hardness of a high-hardness film, if the ratio of the indentation depth to the film thickness is controlled within a certain range, the pressure can be better eliminated. Trace size effect (ISE). However, due to its strict requirements on the test environment and its high price, it has limited its popularity in the field of microhardness testing.
The JH method better separates the intrinsic hardness of the coating from the composite hardness of the coating and the matrix, and takes into account the effect of the indentation size disperser effect. Therefore, the obtained hardness value is closer to the true value of the film coating hardness. However, the JH formula is based on a model of coating cracking. In actual tests, the film does not necessarily produce the kind of cracking that the model assumes, so there is still a difference between the model and the actual one. The extrapolation method is based on the assumption that the hardness at the film thickness of 1/10 from the surface is the hardness of the film, which itself has a large error, the extrapolation is relatively random, and the indentation size effect is not considered (ISE )Impact. From the Meyer diagram, Hf is obtained by the formula of H=1 854adn-2. As long as the Meyer diagram is made accurately, this method is more reliable and simpler than the JH formula.
In short, the indirect method measurement is more troublesome than the direct method of measuring the bar coater. If the intrinsic hardness of the coating is not required, but only the hardness value of the film is compared, the hardness of the film may be separated by using an equal load or a comparison of the film thicknesses.
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