CN101693234A - Micropore ultrasonic plugging method - Google Patents

Abstract

The invention relates to a micropore ultrasonic plugging method which comprises the steps of cleaning the surface of a material to be processed by hole plugging, drying after removing impurities; placing the cleaned material to be processed by the hole plugging into a container filled with hole sealing liquid, immersing the material into the liquid, wherein the temperature of the hole sealing liquid is 25-60 DEG C; applying an ultrasonic field to the surface of the material to carry out the hole plugging, wherein the frequency F is more than or equal to 19KHz, and the power density P is more than or equal to 0.10w/cm2; and taking the material out, and solidifying the hole sealing liquid on the surface of the material. The invention has good sealing effect, and effectively improves the leakage prevention and the corrosion resistance of parts.

Description

Micropore Ultrasonic Plugging Method

technical field

The invention relates to the field of application of ultrasonic technology, in particular to applying ultrasonic to the micropore sealing treatment of parts to improve the performance of parts.

Background technique

A large number of parts are not dense, and there are micropores, such as micropores in coatings, sintered ceramics and powder metallurgy parts, and microshrinkage in castings. These micropores cause parts to leak or reduce the corrosion resistance of parts. Therefore, these parts with specific performance requirements must be sealed during the production process or before use, that is, gelatinous materials or polymer materials are used as sealing materials to seal the open micropores. However, under the action of surface tension, it is difficult for the sealing liquid to enter the deep micropores and some tiny holes, which makes the sealing effect unsatisfactory.

Ultrasound has the following characteristics:

1) Ultrasonic waves can be effectively transmitted in media such as gas, liquid, solid, and solid solution.

2) Ultrasound can transmit strong energy.

3) Ultrasonic waves will produce reflection, interference, superposition and resonance phenomena.

4) When the ultrasonic wave propagates in the liquid medium, it can produce strong impact and cavitation on the interface. Ultrasonic effects have been widely used in practice, mainly in the following aspects:

①Ultrasonic inspection. Ultrasound has a shorter wavelength than ordinary sound waves, has better directionality, and can penetrate opaque substances. This feature has been widely used in ultrasonic flaw detection, thickness measurement, distance measurement, remote control and ultrasonic imaging technology.

②Ultrasonic treatment. Utilizing the mechanical effect, cavitation effect, thermal effect and chemical effect of ultrasound, ultrasonic welding, drilling, solid crushing, emulsification, degassing, dust removal, pot scale removal, cleaning, sterilization, promotion of chemical reactions and biological Research, etc., have been widely used in various sectors such as industry, mining, agriculture, and medical care.

③Basic research. After the ultrasonic wave acts on the medium, an acoustic relaxation process is generated in the medium. The acoustic relaxation process is accompanied by the energy transport process between the respective electric degrees of the molecules, and shows the absorption of sound waves on a macroscopic level. The characteristics and structure of substances can be explored through the absorption of ultrasound by substances.

Contents of the invention

Technical problem: Aiming at the shortcomings of the existing micropore sealing technology of parts, the invention provides a method for sealing micropores of parts, which has good sealing effect and effectively improves the leakage prevention and corrosion resistance of parts.

Technical solution: A method for micropore ultrasonic sealing, the process steps are: cleaning the surface of the material to be sealed, removing debris and then drying; placing the cleaned material to be sealed in a container filled with sealing liquid In the container, and immersed in the liquid, the temperature of the sealing liquid is 25 ℃ ~ 60 ℃; apply an ultrasonic field to the surface of the material to be sealed, frequency: F ≥ 19KHz; power density: P ≥ 0.10w/cm ² ; take out For parts, the sealing fluid on the surface of the material is cured. The application of the ultrasonic field is continuous or intermittent, and the continuous action time should not be too long, lest the temperature of the sealing solution exceed 60°C. The sealing fluid is silicone resin.

Beneficial effects: the present invention applies an ultrasonic field during the hole sealing operation of the parts, so that the parts are sealed in an ultrasonic environment. The specific implementation method is to place the part to be sealed in a container filled with liquid sealing material and immerse it in the sealing material, apply an ultrasonic field to the surface of the part, and the ultrasonic wave will pass through the sealing liquid to the hole to be sealed. The liquid-solid interface of the parts, the ultrasonic effect promotes the sealing material to enter the depth of the micropores and some microscopic pores that are difficult to enter, improving the sealing effect of the micropores. The invention has simple operation, strong practicability, and is relatively easy to realize industrialization; the invention has obvious effect and has good application prospect.

(1) Under the action of ultrasonic field, liquid sealing materials such as silicone resin or epoxy resin can effectively seal the microscopic shrinkage of metal materials.

(2) Under the action of ultrasonic field, the micropores of ceramic materials can be effectively blocked by sealing materials such as silicone resin or epoxy resin. The Al ₂ O ₃ -13%TiO ₂ coating and the Cr ₂ O ₃ -8%TiO ₂ coating were sealed with the organosilicon resin shown in Table 1 under the action of an ultrasonic field. The electrochemical corrosion current of Al ₂ O ₃ -13%TiO ₂ coating decreased from 2.09×10 ^-7 A·cm ^-2 before treatment to 1×10 ^-10 ～10 ^-8 A·cm ^-2 after treatment; The electrochemical corrosion current of Cr ₂ O ₃ -8%TiO ₂ coating decreased from 3.52×10 ^-7 A·cm ^-2 to 1×10 ^-10 ~ 10 ^-8 A·cm ^-2 .

Table 1. Technical indicators of silicone resin

(3) The plasma sprayed Cr ₂ O ₃ -8%TiO ₂ coating is sealed with the organic silicon resin shown in Table 1 under the action of an ultrasonic field, and its 5% NaCl salt spray corrosion resistance life is ≥ 1500h.

Description of drawings

Fig.1 Electrochemical corrosion polarization curves of conventional sealed Al ₂ O ₃ -13%TiO ₂ coatings

Fig.2 Electrochemical corrosion polarization curves of conventional sealed Cr ₂ O ₃ -8%TiO ₂ coatings

Fig.3 Electrochemical corrosion polarization curve of ultrasonically sealed Al ₂ O ₃ -13%TiO ₂ coating

Fig.4 Electrochemical corrosion polarization curve of ultrasonically sealed Cr ₂ O ₃ -8%TiO ₂ coating

Detailed ways

Parts with microscopic pores such as ceramic materials, metallic materials, coatings and platings.

The sealing material is silicone resin, and its technical specifications are shown in Table 1.

Example 1

The micropores of the Al ₂ O ₃ -13%TiO ₂ coating were blocked by ultrasonic technology. The specific process flow is as follows.

①Remove Al ₂ O ₃ -13%TiO ₂ coating dust, sundries, etc.

②Put a certain amount of silicone resin in the container, and completely immerse the parts in the silicone resin at 35°C to 45°C.

③ Turn on the ultrasonic generator with a frequency of 40KHz and a power density of 0.25w/cm ² , and apply an ultrasonic field to the surface of the sealed part in an intermittent manner. The ultrasonic wave acts for 5 minutes, stops for 5 minutes, and acts for another 5 minutes, and so on. The cumulative action time of ultrasound is 30 minutes.

④ Take out the parts from the sealing fluid.

⑤Place the parts in an oven at 115°C for 15 minutes.

⑥Take out the air and cool to room temperature, and the operation is complete.

Example 2

The micropores of the Cr ₂ O ₃ -g%TiO ₂ coating were blocked by ultrasonic technology. The specific process flow is as follows.

①Remove Cr ₂ O ₃ -8%TiO ₂ coating dust, sundries, etc.

②Put a certain amount of silicone resin in the container, and completely immerse the parts in the silicone resin at 35°C to 45°C.

③ Turn on the ultrasonic generator with a frequency of 20KHz and a power density of 0.25w/cm ² , apply an ultrasonic field to the surface of the sealed part in a continuous manner, and act on the ultrasonic for 30 minutes.

④ Take out the parts from the sealing fluid.

⑤Place the parts in an oven at 115°C for 15 minutes.

⑥Take out the air and cool to room temperature, and the operation is complete.

Example 3

Ultrasonic technology is used to seal the shrinkage pores of metal parts. The specific process flow is as follows.

①Remove the surface pollution and sundries of the parts.

②Put a certain amount of silicone resin in the container, and completely immerse the parts in the silicone resin at 30°C to 40°C.

③ Turn on the ultrasonic generator with a frequency of 60KHz and a power density of 0.25w/cm ² , and apply an ultrasonic field to the surface of the sealed part in an intermittent manner. The ultrasonic wave acts for 5 minutes, stops for 5 minutes, and acts for another 5 minutes, and so on. The cumulative action time of ultrasound is 30 minutes.

④ Take out the parts from the sealing fluid.

⑤Place the parts in an oven at 115°C for 15 minutes.

⑥Take it out and cool it to room temperature, and the operation is complete.

Claims (3)

1. A method for micropore ultrasonic plugging, characterized in that the process steps are: a. Clean the surface of the material to be sealed, remove the sundries and dry it; b. Place the cleaned material to be sealed in a container filled with sealing liquid and immerse it in the liquid. The temperature of the sealing liquid is 25°C to 60°C; c. Apply an ultrasonic field to the surface of the material to be sealed, frequency: F≥19KHz; power density: P≥0.10w/cm ² ; d. Take out the parts and cure the sealing fluid on the surface of the material. 2. The method for micropore ultrasonic sealing according to claim 1, characterized in that the applied ultrasonic field is continuous or intermittent, and the continuous action time should not be too long, so as to avoid the temperature of the sealing liquid exceeding 60 ℃. 3. The method for micropore ultrasonic sealing according to claim 1, characterized in that the sealing liquid is a silicone resin.

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