A nondestructive detection method for cracks and chipping of ceramic nozzles

Abstract

The present application belongs to the application field of nondestructive testing technology for ceramic parts, and particularly relates to a nondestructive testing method for cracks and chipping of ceramic nozzles, comprising: cleaning grease, paint, and coating on the surface of the ceramic parts, and drying; completely immersing the ceramic parts in fluorescent penetrant liquid for a certain time; taking the ceramic parts out of the fluorescent penetrant liquid and dripping them for a certain time; removing the fluorescent penetrant liquid on the surface of the ceramic parts by a water spray method, and drying; placing the ceramic parts in a dark room and irradiating them with a black light lamp, and observing the surface of the ceramic parts under irradiation; when there are luminous lines on the surface of the ceramic parts, the ceramic parts have cracks, and when there are block-shaped spots on the surface of the ceramic parts, the ceramic parts have chipping. The crack detection of ceramic products in the present application adopts a low-sensitivity fluorescent penetrant detection method, which effectively solves the problem of identifying defective products such as chipping and cracks in ceramic products, and at the same time provides a reference basis for quality control of other types of ceramic products.

Description

Technical Field

[0001] The present application belongs to the application field of non-destructive testing technology for ceramic parts, and in particular, relates to a non-destructive testing method for cracks and chipping of ceramic nozzles. Background Art

[0002] The non-destructive testing methods currently carried out by our factory mainly include X-ray testing, ultrasonic testing, fluorescent penetration testing, color testing, and fluorescent magnetic particle testing.

[0003] Among them, X-ray testing is suitable for the detection of various materials. It has no special requirements for the surface and structure of the inspected workpiece, and can detect defects of a certain size in the direction of ray propagation. Ultrasonic testing is difficult to detect certain defects on the surface and very near the surface due to the blind spots of the longitudinal wave pulse reflection method and the influence of defect orientation on detection sensitivity. The complexity of the shape of the test piece, such as small size, irregularity, rough surface, and small radius of curvature, has a great impact on the implementation of ultrasonic testing. Fluorescent penetrant testing and color testing are suitable for surface opening defects of non-porous metals and non-metallic materials. They are not limited by the material structure and chemical composition and have higher detection sensitivity. The sensitivity of fluorescent penetrant testing is higher than that of color testing, and color testing is not suitable for aviation parts. Fluorescent magnetic particle testing can only be used for surface and near-surface detection of ferromagnetic materials and is not suitable for ceramic parts.

[0004] Due to the shape and material of ceramic parts, ultrasonic testing and fluorescent magnetic particle testing are not suitable. However, the penetrant dyes used in color testing and highly sensitive fluorescent penetrant testing are not easy to clean when they penetrate into the components, which will affect the service life of the subsequent products. Summary of the invention

[0005] In order to solve the above problems, the present application provides a non-destructive detection method for cracks and chipping of ceramic nozzles, which cleans the grease, paint, and coating on the surface of the ceramic parts and dries them;

[0006] Completely immerse the ceramic piece in the fluorescent penetrant for a certain period of time;

[0007] Take the ceramic piece out of the fluorescent penetrant and let it drip for a certain period of time;

[0008] Use water spraying to remove the fluorescent penetrant on the surface of the ceramic parts and dry them;

[0009] Place the ceramic piece in a dark room and irradiate it with a black light, and observe the surface of the ceramic piece under irradiation;

[0010] When there are luminous lines on the surface of a ceramic part, the ceramic part has cracks; when there are block-shaped spots on the surface of a ceramic part, the ceramic part has fallen pieces.

[0011] 2. The nondestructive detection method for cracks and chipping of ceramic nozzles as described in claim 1 is characterized in that the fluorescent penetrant is a 0.5-level sensitivity fluorescent penetrant, and its model is ARDROX 920A.

[0012] 3. The nondestructive detection method for cracks and chipping of ceramic nozzles as described in claim 1 is characterized in that the water spray method for removing the fluorescent penetrant on the surface of the ceramic part specifically includes: using a water jet with an angle of 30° to the inspected surface for flushing, the water jet is a conical or fan-shaped water flow, the water temperature is 10°C-40°C, and the water pressure is 0.2Mpa.

[0013] 4. The nondestructive detection method for cracks and chipping of ceramic nozzles as claimed in claim 3 is characterized in that during flushing, the cleaning effect is monitored under the irradiation of a black light.

[0014] 5. The nondestructive detection method for cracks and chipping of ceramic nozzles as claimed in claim 1, characterized in that the certain penetration time is 5 minutes.

[0015] 6. The nondestructive detection method for cracks and chipping of ceramic nozzles as claimed in claim 1, characterized in that the dripping time is 5 minutes to 10 minutes.

[0016] 7. The nondestructive detection method for cracks and chipping of ceramic nozzles as described in claim 1 is characterized in that when the ceramic part is placed in a dark room and irradiated by a black light lamp, the black light irradiance on the part surface 380 mm away from the black light filter is greater than 1200 uw / cm2, the white light in the dark room environment is no more than 20 lux, and the observer has 3 minutes of dark adaptation time after entering the dark area.

[0017] 8. The nondestructive detection method for cracks and chipping of ceramic nozzles as described in claim 1 is characterized in that the drying is carried out in a hot air circulation drying device, the temperature of the surface to be tested shall not be greater than 50°C, and the drying time is 5 minutes to 10 minutes.

[0018] The crack detection of ceramic products in the present application adopts a low-sensitivity fluorescent penetrant detection method, which effectively solves the problem of identifying defective products such as falling pieces and cracks in ceramic products. At the same time, it provides a reference basis for the quality control of other types of ceramic products, effectively ensuring the quality and delivery of ceramic products. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a flow chart of a nondestructive detection method for cracks and chipping of ceramic nozzles according to a preferred embodiment of the present application.

[0020] Figure 2 This is a diagram showing the effect of level 3 sensitivity defect detection in a preferred embodiment of the present application;

[0021] Figure 3This is a 0.5-level sensitivity defect detection effect diagram (5 minutes dripping) of a preferred embodiment of the present application;

[0022] Figure 4 This is a 0.5-level sensitivity defect detection effect diagram (10 minutes of dripping) of a preferred embodiment of the present application;

[0023] Figure 5 This is the effect diagram of X-ray detection film. DETAILED DESCRIPTION

[0024] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be further described in detail in detail and in detail in conjunction with the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0025] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installed", "connected", "connected" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0026] like Figure 1 As shown, ARDROX 920A model and 0.5-level sensitivity water-washing penetrant were used to test and verify the suitability of the material in accordance with GJB 2367A-2005. X-ray inspection was performed on defective ceramic parts with cracks and falling pieces in accordance with the requirements of GJB 1187A-2019. The specific process is as follows:

[0027] 1. Penetrant testing and radiographic testing equipment and consumables;

[0028] 1.1 Equipment selection: FPI-Ⅲ fluorescent penetrant testing production line, HS-XY-32 X-ray flaw detector, PROCE 810 automatic film developer.

[0029] 1.2 Material selection: ARDROX 920A 0.5 level sensitivity water-washable penetrant, ARDROX 9705 3 level sensitivity water-washable penetrant, MX125 film, developer, and fixer.

[0030] 2. Penetrant testing and radiographic testing verification;

[0031] 2.1 The ceramic parts with defects were tested with penetrants of level 3 and 0.5 sensitivity respectively. The specific test parameters are shown in Table 1 and Table 2, and the test effect diagram is shown in Figure 1 , Figure 2 , Figure 3 .

[0032] Table 1 Level 3 sensitivity fluorescent penetrant testing operation steps and process parameters

[0033]

[0034]

[0035] Table 2 0.5 level sensitivity fluorescent penetrant testing operation steps and process parameters

[0036]

[0037] 2.2 X-ray inspection is performed on ceramic parts with defects using the inspection parameters in Table 3. Figure 4 , see the negative effect diagram Figure 5 .

[0038] Table 3 X-ray detection operation steps and process parameters

[0039]

[0040]

[0041] 3. Summary of test data analysis

[0042] Fluorescence penetration testing was performed on the ceramic parts with defects according to the operation steps and main process parameters in Table 1 and Table 2. Figure 2-Figure 5 The comparison shows that:

[0043] Fluorescence Penetrant Detection Level 3 Sensitivity Fluorescence shows a heavy background, such as Figure 2 As shown, it causes trouble for the defect assessment personnel. The defects are concealed by the thick fluorescent background, making it difficult to distinguish the defects. Moreover, when the defects are wiped with alcohol or acetone and then imaged for judgment, it is difficult to wipe them off. The defect effect image of the fluorescent penetrant detection with a sensitivity of 0.5 is clearer and cleaner than that of the 3-level sensitivity. The judgment of defects is more intuitive and there is no excessive interference background. Figure 3-Figure 4 As shown, the dripping time is 5min. Figure 3 , than 10min, such as Figure 4 , the imaging background is clearer and defects are easier to judge.

[0044] X-ray inspection is performed on ceramic parts with defects according to the operating steps and main process parameters in Table 3. Figure 5 It turns out that:

[0045] The ceramic part is cylindrical in shape with metal tungsten blocking the middle. During X-ray projection, not only do the edges of the ceramic have poor film imaging due to the edge erosion effect, but the middle part blocked by metal lead cannot be detected. In addition, because the cracks in the ceramic part are subtle defects, there are certain requirements for the direction of the X-ray beam. Therefore, when selecting defective ceramic parts for X-ray inspection, no cracks or chipping defects were found in the film.

[0046] Through comparative tests, it was concluded that the operating steps and main process parameters in Table 2 were solidified into a process card to standardize and guide fluorescent penetration testing of ceramic parts.

[0047] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A nondestructive detection method for cracks and chipping of ceramic nozzles, characterized by: Clean the grease, paint and coating on the surface of ceramic parts and dry them; Completely immerse the ceramic piece in the fluorescent penetrant for a certain period of time; Take the ceramic piece out of the fluorescent penetrant and let it drip for a certain period of time; Use water spraying to remove the fluorescent penetrant on the surface of the ceramic parts and dry them; Place the ceramic piece in a dark room and irradiate it with a black light, and observe the surface of the ceramic piece under irradiation; When there are luminous lines on the surface of a ceramic part, the ceramic part has cracks; when there are block-shaped spots on the surface of a ceramic part, the ceramic part has fallen pieces.

2. The nondestructive detection method for cracks and chipping of ceramic nozzles according to claim 1, characterized in that: The fluorescent penetrant is a 0.5-level sensitivity fluorescent penetrant, and its model is ARDROX 920A.

3. The nondestructive detection method for cracks and chipping of ceramic nozzles according to claim 1, characterized in that: The water spray method for removing fluorescent penetrant from the surface of ceramic parts specifically includes: using a water jet with an angle of 30° to the inspected surface for rinsing, the water jet is a conical or fan-shaped water flow, the water temperature is 10°C-40°C, and the water pressure is 0.2Mpa.

4. The nondestructive detection method for cracks and chipping of ceramic nozzles according to claim 3, characterized in that: While rinsing, monitor cleaning results under a black light.

5. The nondestructive detection method for cracks and chipping of ceramic nozzles according to claim 1, characterized in that: The penetration time is 5 minutes.

6. The nondestructive detection method for cracks and chipping of ceramic nozzles according to claim 1, characterized in that: The dripping time is 5 min to 10 min.

7. The nondestructive detection method for cracks and chipping of ceramic nozzles according to claim 1, characterized in that: When the ceramic parts are placed in a dark room and irradiated by a black light, the black light irradiance on the surface of the parts 380mm away from the black light filter is greater than 1200uw / cm2, the white light in the dark room environment is no more than 20lux, and the observer has 3min of dark adaptation time after entering the dark area.

8. The nondestructive detection method for cracks and chipping of ceramic nozzles according to claim 1, characterized in that: When drying, it should be carried out in a hot air circulation drying device. The temperature of the surface being tested shall not be greater than 50°C, and the drying time shall be 5 minutes to 10 minutes.

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