CN110736825A - Method for detecting shrinkage glaze defect of sanitary ceramic product glaze surfaces - Google Patents
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- 239000000919 ceramic Substances 0.000 title claims abstract description 46
- 230000007547 defect Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims description 42
- 238000005245 sintering Methods 0.000 claims abstract description 42
- 230000008859 change Effects 0.000 claims abstract description 15
- 230000008602 contraction Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 abstract description 22
- 238000010304 firing Methods 0.000 description 23
- 230000008569 process Effects 0.000 description 22
- 238000004519 manufacturing process Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000011449 brick Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000006479 redox reaction Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
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- 239000000428 dust Substances 0.000 description 1
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- 230000007717 exclusion Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
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- 239000005416 organic matter Substances 0.000 description 1
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- 238000003908 quality control method Methods 0.000 description 1
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Abstract
glaze shrinkage defect detection method of sanitary ceramic products is disclosed, the glaze shrinkage defect detection method of sanitary ceramic products evaluates the influence of glazing on the sintering shrinkage of the blank by comparing the change of the distance value of two ends of a glazed fan-shaped ring blank before and after sintering with the change of the distance value of two ends of a non-glazed fan-shaped ring blank before and after sintering.
Description
Technical Field
The invention relates to the technical field of detection of glaze shrinkage defects of ceramic sintering glaze surfaces, in particular to a detection method of the glaze shrinkage defects of sanitary ceramic products.
Background
The sanitary ceramic industry develops for forty years in China, domestic ceramic production quality control means are gradually improved, various finished product defect prevention and control measures are continuously developed, at present, an independent single detection method is not available for evaluating defects of glaze shrinkage (namely the phenomenon that partial glaze layers on the surfaces of ceramic glazes are irregularly stripped and the surfaces of ceramic blanks are exposed) in the industry, the current common detection mode is a right-angle sample brick which is used for detecting bubbles of pores of the glazes and is used for observing whether the corners of the ceramic glazes are subjected to the existing glaze shrinkage or not and is used as a reference for providing whether the glazes are qualified or not, but the detection mode has the problems that the thickness of the right-angle sample brick is large and the shape is three-dimensional, so that the shape change of the right-angle sample brick in the sintering process is small, the glaze peeling phenomenon occurs at the corners only when the internal stress exceeds the drying strength of the glazes, the glaze peeling phenomenon occurs at the corners cannot be used for showing the condition that the glaze layers generate the glaze shrinkage defects on the surfaces of the blanks, in addition, the glaze peeling phenomenon cannot be used for controlling the glaze material shrinkage, and the glaze directional adjustment of glaze materials, and the glaze material selection and the glaze material adjustment, and the directional adjustment and the glaze material and the detection method can not be used for providing the improvement on the directional detection risk factor for improving the glaze.
In order to solve the problems, in methods for rapidly detecting the bonding effect of the blank glaze are provided in a Chinese patent with the patent number of CN107966404A published in 2018, 4, 27, the change value of the linear distance between two points on a sintering ring is used for representing the difference of the sintering shrinkage rate between a green body and the blank glaze so as to judge the bonding effect of the blank glaze, but the method is not suitable for measuring the shrinkage defect in the production process of a ceramic product.
Disclosure of Invention
The invention aims to overcome the defects or problems in the background technology, and provides a method for detecting the glaze shrinkage defect of sanitary ceramic products, which can solve the problem of evaluating the influence of glazing on the sintering shrinkage of a blank in the production process of a ceramic blank.
In order to achieve the purpose, the invention adopts the following technical scheme:
method for detecting glaze shrinkage defect of sanitary ceramic product, which evaluates the influence of glazing on the sintering shrinkage of the blank by comparing the change of the distance value of the two ends of the glazed fan-shaped ring blank before and after sintering with the change of the distance value of the two ends of the unglazed fan-shaped ring blank before and after sintering.
And , the two ends of the sector ring blank are the two ends of the inner side of the sector ring blank facing the circle center.
And , setting the absolute value of the difference between the distance values of the two ends of the glazed fan-shaped ring blank before and after sintering as a difference, setting the absolute value of the difference between the distance values of the two ends of the unglazed fan-shaped ring blank before and after sintering as a second difference, setting the ratio of the difference to the second difference as a fan-shaped ring contrast value, and when the fan-shaped ring contrast value is 7-12%, the blank glaze is qualified in firing matching.
, the fan-shaped ring blank is a semi-circular ring blank.
, the thickness of the sector ring blank is less than or equal to 5 mm.
, the thickness of the sector ring blank is 3-5 mm.
, the thickness of the surface glaze layer on the outer surface of the sector ring blank is 0.5-1 mm.
As can be seen from the above description of the present invention, the present invention has the following advantages over the prior art:
1. the method aims to solve the problems that the detection glaze determines the influence of the glaze on the sintering shrinkage of a green body in the actual firing process and adjusts the glaze performance to avoid the glaze shrinkage risk in the actual application in the design stage, the matching performance of the glaze and the green body in the firing temperature rise stage needs to be truly embodied, the technical task needs to be completed, the method comprises , which is used for evaluating the thickness of a green body sample of the sintering matching performance of the glaze and the green body is not too thick to avoid the situation that the shrinkage defect cannot be normally reflected due to the absorption of the glaze layer stress by the strength of the green body, the shape of the sample meets the requirement that the dimensional deformation process of the green body and the glaze layer in the firing process can be well simulated due to the stress change so as to achieve the purpose of the influence of the glaze on the sintering shrinkage of the ceramic product during the fitting actual production, and the judgment of the stress difference between the green body and the glaze layer is compared according to the dimensional change data before and after the green body sintering, and the dimensional change data before and after the sintering of the glaze is adopted in the ceramic product, the technical scheme, the detection of the difference between the green body and the glaze shrinkage of the detection glaze and the glaze ring, the detection of the detection glaze and the detection of the stress of the detection glaze, the detection glaze and the detection of the stress difference between the green body, the detection of the detection glaze and the detection glaze shrinkage of the detection of the blank body, the blank after the blank body, the blank after the blank and the blank, the blank body, the blank and the blank body, the blank body before and the blank body are improved, the blank body can be compared to the blank body, the blank body can be compared to the blank body, the blank body can be compared to the blank body, the blank is more well, the blank body can be compared to the blank body, the blank body can be compared to the blank body, the blank is more well, the blank shrinkage stress deformation of the blank shrinkage deformation of the.
2. The two ends of the fan-shaped annular blank body with the measured size change condition are the two ends facing the center of the circle in the fan-shaped annular blank body, and the influence of the glaze layer on the sintering shrinkage of the blank body in the sintering process can be faithfully embodied.
3. The sector ring blank in the technical scheme can be realized by adopting a semicircular ring blank.
4. The thickness of the sector ring blank is 3-5mm, so that the blank is not easy to damage in the manufacturing process and the material waste is reduced under the condition that the stress action condition in the sintering process of the blank and the glaze layer can be reflected truly.
5. The thickness of the glaze layer applied on the outer surface of the sector ring blank is 0.5-1mm, which not only simulates the common glaze application thickness on the surface of the ceramic blank in actual production, but also can not reflect the shrinkage or expansion stress generated in the glaze firing process because the shrinkage or expansion stress is not counteracted by the blank stress.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a half-ring blank glazed in an embodiment of the present invention before and after firing;
fig. 2 is a schematic diagram of directions of deformation forces generated by a glaze layer and a blank in each temperature region during the firing process of the glazed semicircular ring blank and the unglazed semicircular ring blank in the embodiment of the invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are presently preferred embodiments of the invention and are not to be taken as an exclusion of other embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the claims, the specification and the drawings of the present invention, unless otherwise specifically limited, the terms "", "second" or "third", etc. are used for distinguishing between different items and not for describing a particular order.
In the claims, the specification and the drawings of the present invention, unless otherwise expressly limited, all directional or positional relationships indicated by the terms "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," "counterclockwise," and the like are based on the directional or positional relationships indicated in the drawings and are used for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element so indicated must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of the present invention.
In the claims, the specification and the drawings of the present application, unless otherwise expressly limited, the term "fixedly" or "fixedly connected" is used to mean , which means that there is no connection in a relative rotational or non-displaceable relationship between the two, that is, non-detachably fixed, connected, and fixedly connected by other means or elements.
In the claims, the specification and the drawings of the present invention, the terms "including", "having" and their variants, if used, are intended to be inclusive and not limiting.
Referring to fig. 1, fig. 1 shows a schematic structural diagram of the glazed semicircular ring blank before and after firing in the present embodiment. Specifically, the method for detecting the glaze shrinkage defect of the glaze surface of the sanitary ceramic product provided by the embodiment adopts a sector ring blank, and evaluates the influence of glazing on the sintering shrinkage of the blank by comparing the change of the distance value of the two ends of the glazed sector ring blank before and after sintering with the change of the distance value of the two ends of the glazed sector ring blank before and after sintering; wherein, the two ends of the sector ring blank body specifically refer to the two ends of the inner side of the sector ring blank body facing the center of a circle, so as to faithfully embody the acting force condition of the glaze layer on the sintering shrinkage of the blank body in the sintering process.
In the embodiment, the absolute value of the difference between the distance values of the two ends of the glazed fan-shaped ring blank before and after sintering is set as the th difference, the absolute value of the difference between the distance values of the two ends of the unglazed fan-shaped ring blank before and after sintering is set as the second difference, the ratio of the th difference to the second difference is the fan-shaped ring contrast value, and when the fan-shaped ring contrast value is 7-12%, the blank glaze sintering matching is qualified.
Preferably, the sector ring blank adopted in the embodiment is a semicircular ring blank, the thickness of the sector ring blank is less than or equal to 5mm, and the thickness of the glaze layer applied on the surface of the sector ring blank is 0.5-1mm, so that the glazing thickness commonly used on the surface of the ceramic blank in actual production is simulated, and the contraction or expansion stress generated in the glaze firing process cannot be counteracted by the blank stress and cannot be reflected. Preferably, the thickness of the sector ring blank in this embodiment is 3-5mm, so that the blank is not easily damaged in the manufacturing process and the waste of materials is reduced under the condition that the stress action condition in the sintering process of the blank and the glaze layer can be reflected truly.
Referring to fig. 2, fig. 2 is a schematic diagram showing the directions of the glaze layer and the deformation force generated by the blank in each temperature region during the firing process of the glazed semi-circular ring-shaped blank and the unglazed semi-circular ring-shaped blank of the present embodiment. Specifically, the ceramic body loses attached moisture from 100 ℃, an organic matter is burnt out at 300 ℃, crystal form transformation is started at 587 ℃, and sintering is started at about 900 ℃; the glaze usually loses crystal water at 500 ℃ and starts redox reaction at about 680-900 ℃, and actually, deformation difference between the semicircular ring blank and the glaze mainly occurs in a temperature range from about 900 ℃ of the blank starting to be sintered to the melting point of the glaze, and the sintering in the temperature range has the largest influence on the deformation of the blank glaze; specifically, in the temperature range, the blank body begins to react and discharge structural water, gas is released after redox reaction, the porosity is reduced, the blank body is rapidly contracted, the glaze material begins to melt, the porosity is increased and expanded, the semicircular ring blank is deformed inwards in the process of continuous expansion of the glaze material, and the semicircular ring is opened, so that the two ends of the semicircular ring blank are deformed more than the semicircular ring blank in the process of continuous expansion of the glaze layer acting on the semicircular ring blank, and the deformation is faithfully realized on the size change of the two ends.
The specific operation method of the method for detecting the glaze shrinkage defect of the sanitary ceramic product glaze surface of the embodiment is as follows:
manufacturing a semi-circular ring blank: adopting a semicircular ring gypsum mould to manufacture a formed semicircular ring ceramic blank by a slurry grouting forming method, wherein the thickness of the manufactured semicircular ring blank is 4 +/-1 mm; the diameter is 100 plus or minus 1.5 mm; the width is 22 +/-1 mm, and the surface of the material is smooth and has no phenomena of burrs, cracks, floating dust and the like.
Marking samples, namely selecting two qualified groups of samples, wherein each sample comprises a sample needing glazing and a sample not needing glazing, the sample to be glazed in the group is marked as S-1, the sample not needing glazing is marked as W-1, the sample to be glazed in the second group is marked as S-2, the sample not needing glazing is marked as W-2, the sample to be glazed in the third group is marked as S-3, and the sample not needing glazing is marked as W-3, and … ….
Glazing, namely, evenly applying layers of glaze on the outer surface of each sample to be glazed, wherein the thickness of the glaze is 0.65 +/-0.05 mm (the thickness can be calculated by adopting a weighing method), and scraping the edge of the glaze layer to form a 45-degree inclination angle so as to prevent the glaze layer from sticking to a kiln in the firing process.
And (3) size determination: respectively measuring the sizes of the two ends of the inner side of each sample facing the center of the circle by using a vernier caliper, and respectively recording the sizes of the samples S-1, S-2 and S-3 … … as A1(S-1)、A1(S-2)、A1(S-3) … …, recording the size B of samples W-1, W-2, W-3 … …, respectively1(W-1)、B1(W-2)、B1(W-3)……。
Firing: all the samples, glazed and unglazed, were placed on a flat kiln furniture coated with an alumina barrier layer and fired according to a practically specific firing process until firing was complete.
And (3) size determination: respectively measuring the sizes of the two ends of the inner side of each sample facing the center of the circle by using a vernier caliper, and recording the sizes A of the samples S-1, S-2 and S-3 … …2(S-1)、A2(S-2)、A2(S-3) … …, recording the size B of samples W-1, W-2, W-3 … …, respectively2(W-1)、B2(W-2)、B2(W-3)……。
And calculating the semi-circle contrast value, namely calculating the semi-circle contrast value of each groups of samples by adopting the following calculation formula:
semi-circle contrast value ═ (| distance between two ends before sintering of glazed sample-distance between two ends after sintering of glazed sample |)/(| distance between two ends before sintering of unglazed sample-distance between two ends after sintering of unglazed sample |)
And (3) calculating an average value and comparing: the average value of the semicircular ring contrast values of the samples of each group is obtained, and whether the comparative value falls in the range of 7-12% is judged.
The is characterized in that the thickness of the sector ring blank is less than or equal to 5mm, so that the absorption of stress generated by a glaze layer in the firing process is small, the result of the interaction between the blank and the glaze layer in the firing temperature-rise stage is greatly reflected, the deformation results of the glaze layer and the blank due to the stress variation difference after firing can be recorded in a field manner, two ends of the sector ring blank are open, the stress variation in the glaze firing process is not influenced by the shape, the dimensional deformation condition of the blank due to the stress variation can be simulated well, in addition, in the sector ring structure, the deformation stress generated in the firing process of the blank and the glaze layer is larger, the stress generated at two ends is the largest, and in the actual production process, the corner of the ceramic product is in the deformation condition formed in the firing process, so that the deformation stress generated in the blank and the glaze layer is matched with the corner of the ceramic product is better, the deformation condition of the ceramic product is matched with the deformation of the ceramic blank in the firing reaction glaze ring blank, and the corner of the ceramic product is matched with the reaction glaze shrinkage stress generated in the firing process, so that the ceramic product is matched with the blank shrinkage stress of the blank, the reaction glaze ring blank, the reaction glaze shrinkage stress generated in the firing process, the corner of the ceramic product, the ceramic product is better, the ceramic product, the reaction stress of the ceramic product is matched with the glaze shrinkage stress of the glaze, the glaze product, the glaze shrinkage of the ceramic product, the glaze is matched with the glaze, the glaze shrinkage of the glaze, the glaze in the glaze, the reaction glaze ring blank, the shrinkage of the glaze and the ceramic product, the glaze shrinkage of the glaze ring blank, the glaze shrinkage of the ceramic product, the shrinkage of the glaze, the shrinkage of the glaze, the ceramic product, the glaze, the shrinkage of the ceramic product, the ceramic.
The description of the above specification and examples is intended to be illustrative of the scope of the present invention and is not intended to be limiting.
Claims (7)
- The method for detecting glaze shrinkage defects of glaze surfaces of sanitary ceramic products is characterized in that the influence of glazing on the sintering shrinkage of a blank body is evaluated by comparing the change of the distance value of the two ends of a glazed fan-shaped ring blank body before and after sintering with the change of the distance value of the two ends of the unglazed fan-shaped ring blank body before and after sintering.
- 2. The method for detecting the glaze contraction defect of the kinds of sanitary ceramic products as claimed in claim 1, wherein the two ends of the sector ring blank are the two ends of the inner side of the sector ring blank which face the center of the circle.
- 3. The method for detecting the glaze contraction defect of the kinds of sanitary ceramic products, as claimed in claim 1, wherein the absolute value of the difference between the distance values of the two ends of the glazed fan-shaped ring blank before and after sintering is set to be , the absolute value of the difference between the distance values of the two ends of the unglazed fan-shaped ring blank before and after sintering is set to be the second difference, the ratio of the th difference to the second difference is the fan-shaped ring contrast, and when the fan-shaped ring contrast is 7-12%, the matching of the glaze sintering is qualified.
- 4. The method for detecting the glaze shrinkage defect of the kinds of sanitary ceramic products according to claim 1, wherein the fan-shaped ring blank is a semi-circular ring blank.
- 5. The method for detecting the glaze shrinkage defect of the glaze surface of kinds of sanitary ceramic products, as claimed in claim 1, wherein the thickness of the fan-shaped ring blank is less than or equal to 5 mm.
- 6. The method for detecting the glaze contraction defect of the kinds of sanitary ceramic products as claimed in claim 5, wherein the thickness of the sector ring blank is 3-5 mm.
- 7. The method for detecting the glaze contraction defect of the kinds of sanitary ceramic products as claimed in claim 1, wherein the thickness of the glaze layer on the outer surface of the sector ring blank is 0.5-1 mm.
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Cited By (2)
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| CN113554240A (en) * | 2021-08-20 | 2021-10-26 | 林周县众陶联供应链服务有限公司 | Data analysis and prediction method and system for architectural ceramic tile surface decoration glazing |
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