A method for evaluating the toughness of ceramic tiles

Abstract

The present invention discloses a method for evaluating the toughness of ceramic tiles, comprising the following steps: S1. preparing a sample to be tested: preparing the sample to be tested in accordance with the requirements of GB / T3810.5-2016; S2. testing the impact recovery coefficient: using a CHY type recovery coefficient tester to measure the impact recovery coefficient of the sample to be tested; S21. rotating a hand wheel to adjust a support plate to a specified position, placing the sample to be tested into the specified position from the rear of a clamp, and then rotating the hand wheel in the opposite direction to clamp the sample to be tested; S22. turning on the power supply, placing a steel ball into a ball socket of a machine head, and when the suction / drop light is on, an electromagnet sucks the steel ball; S23. pressing the suction / drop button, the steel ball falls, and after it bounces back, the screen displays the impact recovery coefficient and the rebound height, and records the impact recovery coefficient; S24. taking out the sample to be tested and preparing for the next test. After all the tests are completed, turning off the power supply and cleaning the instrument; the evaluation method described in the present invention can effectively evaluate the toughness of the sample to be tested by detecting the impact recovery coefficient obtained.

Description

Technical Field

[0001] The present invention relates to the field of ceramic tile technology applications, and in particular to a method for evaluating ceramic tile toughness. Background Art

[0002] Toughness generally refers to a material's ability to absorb energy during plastic deformation and fracture. The greater the toughness, the less likely it is to undergo brittle fracture. In materials science and metallurgy, toughness refers to a material's resistance to breaking when subjected to stress. It is defined as the ratio of the energy a material can absorb before breaking to its volume.

[0003] The quality inspection items for tiles include: water absorption rate, length and width error, straightness, surface flatness, thermal shock resistance, glaze crack resistance, glossiness, wear resistance, frost resistance, impact resistance, linear expansion coefficient, etc. However, there is no direct inspection method or inspection standard that can be used to evaluate the toughness of tiles.

[0004] Therefore, it is necessary to propose a method to evaluate the toughness of tiles. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the present invention aims to provide a method for evaluating the toughness of ceramic tiles;

[0006] A method for evaluating the toughness of ceramic tiles comprises the following steps:

[0007] S1. Preparation of samples to be tested

[0008] Prepare samples to be tested in accordance with the requirements of GB / T3810.5-2016;

[0009] S2. Impact recovery coefficient test

[0010] Use CHY type recovery coefficient tester to measure the impact recovery coefficient of the sample to be tested;

[0011] S21. Rotate the handwheel to adjust the support plate to the designated position, place the sample to be tested into the designated position from the rear of the fixture, and then rotate the handwheel in the opposite direction to clamp the sample to be tested;

[0012] S22. Turn on the power and put the steel ball into the ball socket of the machine head. When the suction / drop light turns on, the electromagnet sucks the steel ball.

[0013] S23. Press the suction / drop button, and the steel ball will drop. After it bounces back, the screen will display the impact recovery coefficient and rebound height. Record the impact recovery coefficient.

[0014] S24. Take out the sample to be tested and prepare for the next test. After all the tests are completed, turn off the power and clean the instrument.

[0015] The toughness level of the sample to be tested is evaluated by the impact recovery coefficient X obtained by the test;

[0016] Preferably, the toughness grade evaluation method of the sample to be tested is:

[0017] Set the K value and compare the impact recovery coefficient X and K value of the sample to be tested; the K value is 0.55;

[0018] When the impact recovery coefficient X of the sample to be tested is greater than the K value, the toughness grade of the sample to be tested is ≥1;

[0019] When the impact recovery coefficient X of the sample to be tested is less than the K value, the toughness grade of the sample to be tested is 0;

[0020] More preferably, when the impact recovery coefficient of the sample to be tested is 0.55≤X≤0.70, the toughness grade of the sample to be tested is 1;

[0021] When the impact recovery coefficient of the sample to be tested is 0.71≤X≤0.85, the toughness grade of the sample to be tested is 2;

[0022] When the impact recovery coefficient of the sample to be tested is 0.86≤X≤1.0, the toughness grade of the sample to be tested is 3;

[0023] When the impact recovery coefficient of the sample to be tested is 1.01≤X≤1.2, the toughness grade of the sample to be tested is 4;

[0024] When the impact recovery coefficient of the sample to be tested is X>1.2, the toughness grade of the sample to be tested is 5;

[0025] Preferably, the diameter of the steel ball is 19 mm ± 0.05 mm.

[0026] Preferably, the steel ball hits the middle of the sample to be tested.

[0027] Preferably, the height of the designated position includes 1.0 meters, 1.5 meters, 1.8 meters, and 2.0 meters.

[0028] The beneficial effects of the present invention are:

[0029] The evaluation method of the present invention compares the impact resistance test results of the ceramic tiles, the impact recovery coefficient X and the K value, and the K value is selected as 0.55; when the impact recovery coefficient obtained by the test is less than 0.55, it means that the toughness of the ceramic tile is poor and it is easy to break; when the impact recovery coefficient X obtained by the test is ≥0.86, the toughness level of the ceramic tile can be evaluated as ≥3, which shows that it has high toughness and is not easy to break. DETAILED DESCRIPTION

[0030] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the embodiments. The contents mentioned in the embodiments are not intended to limit the present invention.

[0031] Example 1

[0032] Example 1

[0033] A method for evaluating the toughness of ceramic tiles comprises the following steps:

[0034] S1. Preparation of samples to be tested

[0035] Prepare the sample to be tested in accordance with the requirements of GB / T3810.5-2016. The size of the sample to be tested is 0.75*0.75mm;

[0036] S2. Impact recovery coefficient test

[0037] Use CHY type recovery coefficient tester to measure the impact recovery coefficient of the sample to be tested;

[0038] S21. Rotate the handwheel to adjust the support plate to the designated position, place the sample to be tested into the designated position from the rear of the fixture, and then rotate the handwheel in the opposite direction to clamp the sample to be tested;

[0039] S22. Turn on the power and place a steel ball (diameter 19mm±0.05mm) into the ball socket of the machine head. When the suction / drop light comes on, the electromagnet will suck up the steel ball.

[0040] S23. Press the suction / drop button, and the steel ball will drop (hit the middle of the sample to be tested). After it bounces back, the screen will display the impact recovery coefficient and rebound height, and record the impact recovery coefficient;

[0041] S24. Take out the sample to be tested and prepare for the next test. After all the tests are completed, turn off the power and clean the instrument.

[0042] The toughness level of the sample to be tested is evaluated by the impact recovery coefficient obtained by testing;

[0043] The toughness grade evaluation criteria are:

[0044] Set the K value and compare the impact recovery coefficient X and K value of the sample to be tested; the K value is 0.55; when the impact recovery coefficient X of the sample to be tested is greater than the K value, the toughness grade of the sample to be tested is ≥1;

[0045] When the impact recovery coefficient X of the sample to be tested is less than the K value, the toughness grade of the sample to be tested is 0;

[0046] When the impact recovery coefficient of the sample to be tested is 0.55≤X≤0.70, the toughness grade of the sample to be tested is 1;

[0047] When the impact recovery coefficient of the sample to be tested is 0.71≤X≤0.85, the toughness grade of the sample to be tested is 2;

[0048] When the impact recovery coefficient of the sample to be tested is 0.86≤X≤1.0, the toughness grade of the sample to be tested is 3;

[0049] When the impact recovery coefficient of the sample to be tested is 1.01≤X≤1.2, the toughness grade of the sample to be tested is 4;

[0050] When the impact recovery coefficient of the sample to be tested is X>1.2, the toughness grade of the sample to be tested is 5;

[0051] Example 2

[0052] The specific toughness grade evaluation process of the samples to be tested is as follows:

[0053] The results are obtained by performing 100 summary analyses on the same sample to be tested (ceramic tiles of the same model and within the same range of impact recovery coefficient) at a specified height. The specific process is shown in Table 1 below:

[0054] Table 1

[0055]

[0056] According to the above results, the drop resistance requirements corresponding to the toughness evaluation level are:

[0057] When the evaluation level is 0, the fragmentation rate of the steel ball when it falls from a height of 1.0 meter is ≤80%;

[0058] When the evaluation level is level 1, the fragmentation rate of the steel ball when it falls from a height of 1.0 meters is ≤21%, and the fragmentation rate of the steel ball when it falls from a height of 1.5 meters is ≤72%;

[0059] When the evaluation level is 2, the sample to be tested is intact when the steel ball falls from a height of 1.0 meters; the fragmentation rate when the steel ball falls from a height of 1.5 meters is ≤41%;

[0060] When the evaluation level is level 3, the sample to be tested is intact when the steel ball falls from a height of 1.0 meter; the fragmentation rate when the steel ball falls from a height of 1.5 meters is ≤13%; the fragmentation rate when the steel ball falls from a height of 1.8 meters is ≤32%;

[0061] When the evaluation level is 4, the sample to be tested is intact when the steel ball drops from a height of 1.0 meters; the sample to be tested is intact when the steel ball drops from a height of 1.5 meters; the fragmentation rate when the steel ball drops from a height of 1.8 meters is ≤15%; the fragmentation rate when the steel ball drops from a height of 2.0 meters is ≤24%;

[0062] When the evaluation level is 5, the sample to be tested is intact when the steel ball drops from a height of 1.0 meter; the sample to be tested is intact when the steel ball drops from a height of 1.5 meters; the sample to be tested is intact when the steel ball drops from a height of 1.8 meters; and the sample to be tested is intact when the steel ball drops from a height of 2.0 meters.

[0063] Tiles on the market were randomly selected and the impact recovery coefficient X was measured (10 tiles were tested at one height) and the toughness was evaluated according to the evaluation method described in Example 1. The drop test was then analyzed according to the requirements of the drop test in Example 2. The specific results are shown in Table 2 below.

[0064] Table 2

[0065]

[0066] In Table 2, we can see that:

[0067] Test group 1, 0.86<X=0.93<1.0, according to the evaluation method, the toughness grade is level 3, indicating that the sample has high toughness and is not easy to break. At this time, the sample is intact when the steel ball drops from a height of 1.0 meters; the fragmentation rate is 10% when the steel ball drops from a height of 1.5 meters; and the fragmentation rate is 20% when the steel ball drops from a height of 1.8 meters. This meets the drop test fragmentation rate requirements recorded in Table 1 and can be used to evaluate the toughness of the sample.

[0068] Test group 2, 1.2<X=1.3, according to the evaluation method, the toughness level is level 5, indicating that the sample to be tested has very high toughness and is difficult to break. At this time, the sample to be tested is intact when the steel ball drops from a height of 1 meter; the sample to be tested is intact when the steel ball drops from a height of 1.5 meters; the sample to be tested is intact when the steel ball drops from a height of 1.8 meters; and the sample to be tested is intact when the steel ball drops from a height of 2.0 meters. This meets the drop test fragmentation rate requirements recorded in Table 1 and can be used to evaluate the toughness of the sample to be tested.

[0069] Test group 3, 0.55>X=0.4. According to the evaluation method, the toughness grade is 0, indicating that the sample has very low toughness and is very fragile. At this time, the fragmentation rate of the steel ball when dropped from a height of 1 meter is 70%, which meets the drop test fragmentation rate requirements recorded in Table 1 and can be used to evaluate the toughness of the sample.

[0070] Test group 4, 0.55<X=0.6<0.70, according to the evaluation method, the toughness grade is 0, indicating that the sample has low toughness and is easily broken. In this case, the fragmentation rate of the steel ball when it is dropped from a height of 1.0 meters is 0, and the fragmentation rate of the steel ball when it is dropped from a height of 1.5 meters is 50%. This meets the drop test fragmentation rate requirements recorded in Table 1 and can be used to evaluate the toughness of the sample.

[0071] Therefore, it can be seen that the toughness of tiles can be measured by the size of the impact recovery coefficient and the resistance to drop. The larger the impact recovery coefficient and the better the drop resistance, the better the toughness of the tile, otherwise the toughness is poor. If the impact recovery coefficient of the tile is less than 0.55, it indicates that the tile has poor toughness, and the impact recovery coefficient is greater than 0.90, it indicates that the tile has good toughness. At the same time, the above drop resistance results are also within the fragmentation range of the evaluation method, indicating that the toughness evaluation method of the present invention has certain applicability. The measured impact recovery coefficient X can be directly compared with the K value, and then the toughness of the tile can be evaluated according to the toughness grade evaluation method to evaluate the toughness grade of the tile, which is convenient for screening out tile products with high toughness and poor toughness.

[0072] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the scope of protection of the present invention.

Claims

1. A method for evaluating the toughness of ceramic tiles, comprising the following steps: S1. Preparation of samples to be tested Prepare the sample to be tested in accordance with the requirements of GB / T3810.5-2016; the size of the sample to be tested is 0.75*0.75mm; S2. Impact recovery coefficient test Use CHY type recovery coefficient tester to measure the impact recovery coefficient of the sample to be tested; S21. Rotate the handwheel to adjust the pallet to the designated position, place the sample to be tested from the rear of the fixture into the designated position, and then reversely rotate the handwheel to clamp the sample to be tested; the height of the designated position includes 1.0 m, 1.5 m, 1.8 m, and 2.0 m; S22. Turn on the power and place the steel ball into the ball socket of the machine head. When the suction / drop light comes on, the electromagnet picks up the steel ball; the diameter of the steel ball is 19mm ± 0.05mm. The steel ball hits the middle of the sample to be tested. S23. Press the suction / drop button, and the steel ball will drop. After it bounces back, the screen will display the impact recovery coefficient and rebound height. Record the impact recovery coefficient. S24. Remove the sample to be tested and prepare for the next test. After all tests are completed, turn off the power and clean the instrument; The method is characterized in that the toughness grade of the sample to be tested is evaluated by the obtained impact recovery coefficient X, a K value is set, and the impact recovery coefficient X and the K value of the sample to be tested are compared; the K value is 0.55; when the impact recovery coefficient X of the sample to be tested is greater than the K value, the toughness grade of the sample to be tested is ≥1; when the impact recovery coefficient X of the sample to be tested is less than the K value, the toughness grade of the sample to be tested is 0; When the impact recovery coefficient of the sample to be tested is 0.55≤X≤0.70, the toughness grade of the sample to be tested is 1; when the impact recovery coefficient of the sample to be tested is 0.71≤X≤0.85, the toughness grade of the sample to be tested is 2; when the impact recovery coefficient of the sample to be tested is 0.86≤X≤1.0, the toughness grade of the sample to be tested is 3; when the impact recovery coefficient of the sample to be tested is 1.01≤X≤1.2, the toughness grade of the sample to be tested is 4; when the impact recovery coefficient of the sample to be tested is X>1.2, the toughness grade of the sample to be tested is 5.

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