JPH03161084A - Supersonic wave vibration transmitting horn - Google Patents

Abstract

PURPOSE:To prevent erosion by bonding a ceramic plate at the end of a super sonic wave vibration transmitting horn. CONSTITUTION:A high tough zirconia ceramic plate 2 is heat treated at approxi mately 950 deg.C in the argon atmosphere at the end of a supersonic wave transmit ting horn 1 by means of a titanium based brazing material to bond the horn 1 with the ceramic plate 2. Said horn is mounted on an oscillating section for use. The ceramic plate is not peeled off by said arrangement to prevent erosion.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field in Icheon) The present invention relates to a transsonant vibration transmission horn for an ultrasonic generator such as an ultrasonic homogenizer assembly used for liquid dispersion, etc. [Prior art and its problems] SUS and titanium alloys have conventionally been commonly used as ultrasonic vibration transmission horns (hereinafter referred to as horns) of ultrasonic homogenizer devices. However, these metals
8! Cavitation and chemical erosion phenomena associated with the generation of sound waves erode the tip of the horn, causing worn metal pine dust to disperse and mix into the sample, resulting in contamination of the sample. The reality is that there are. For example, when a horn made of SUS is used to disperse ceramic powder, the dispersed powder may be colored, giving a bad image to the product.

In addition, when the dispersion liquid is corrosive such as acid, the film is easily peeled off due to cavitation, so the corrosion progresses rapidly, and the horn itself has to be repaired in a complicated manner. It also has some problems. In order to solve these problems, prototype horns made of alumina are also being sold, but in the case of ceramic horns, sintering is required to create a horn that is tuned to ultrasonic oscillations. Since the shape of the body and the sintering density are required to be as precise as metals, it is necessary to control the shape as well as the sintering conditions very strictly. It is quite difficult. Therefore, the present invention seeks to provide a simple and effective means for solving this problem. [Means for Solving the Problem] , a ceramic plate is glued to the tip of the horn, and with this structure, it is intended to have the same effect as, for example, the horn itself made of ceramic. In other words, by attaching a ceramic plate that is resistant to erosion and wear to the tip of the horn, or a ceramic plate that does not cause problems even if it gets mixed in with the processed material, the number of contaminants can be minimized, or even if they do get mixed in, the processed material can be minimized. As a result, a product with no problems can be obtained.The thickness of the ceramic plate bonded to the tip of the horn is 0.05 mm.
~Three temples are good.

When the ceramic plate becomes thicker, a large stress is generated between the metal part and the ceramic plate when ultrasonic waves are oscillated, and as the thickness of the ceramic plate itself increases and the weight increases, this stress increases at an accelerated rate. As a result, the ceramic plate will peel off. On the other hand, if the ceramic plate is made thin, even if it is a wear-resistant ceramic plate, it will corrode little by little, making it necessary to repeatedly replace it.
Also, depending on the time of adhesion and subsequent handling, problems such as easy breakage may occur. Therefore, the ceramic plate to be bonded should be 0.05~3rIm1
Preferably, at about 0.3 to 1.5 W, the best horn can be obtained in terms of adhesive durability and other aspects. The material for the ceramic plate is not particularly limited, but an alumina ceramic plate that has good strength, corrosion resistance, wear resistance, etc., and is the most unicarbon ceramic material is usually sufficient. In addition to alumina, other wear-resistant and corrosion-resistant Ceraξ/Nox materials include silicon nitride,
Glass plates such as silicon carbide, Silphere, and even silica glass are also ceramic materials in a broad sense, and any of these can be used. In addition, there are no particular limitations on the adhesive or bonding method for bonding the ceramic plate to the tip of the horn.
The adhesive may be bonded using a brazing method using a commercially available aluminous adhesive or a metal brazing agent. There is just 'at'
Needless to say, when using an adhesive of No. n, it is preferable to use an adhesive that is water and chemical resistant. [Example] Figure 1 shows a side view of a horn l made of SUS304 with a tip portion of 16a*φ in an ultrasonic homogenizer used for dispersing zirconia ceramic powder.
1. At the tip of the horn, a high-toughness zirconia ceramic 4ffl2 of 1.2wLX18■φ is placed by Sumitomo Special Metal Industries, Ltd.
At 950℃ in an argon atmosphere using titanium brazing material made by
The horn 1 and the ceramic plate 2 were bonded together by heat treatment for 10 minutes at the same time. Using this horn, we attached it to the oscillating part of an ultrasonic oscillator with an output of 1.1 W, and conducted a 5-hour dispersion test on an ethanol suspension of zirconia ceramic'a powder.
As a result, no abnormality was observed in the oscillation dispersion performance.
The ceramic plate did not peel, there was almost no erosion, and the dispersibility of the ceramic particles was good. When the separated powder was press-molded and fired, a good sintered body with a density of nearly 100% was obtained. Regarding the zirconia ceramic powder similar to Example 1,
Dispersion treatment was carried out in the same manner as in Example 1 using a conventional SUS horn as is. In this case, although the tip of the SUS horn was not so corroded, when the dispersed powder was press-formed and fired to produce a sintered body in the same manner as in Example 1, the sintered body was thin. It was colored brown. That is, in this case, the tip of the SUS horn was eroded, causing problems such as discoloration even if the erosion was slight.

To further test the durability of the joint part, we tested it for about 30 minutes intermittently under the same conditions as those shown in Example 1.
A 00 hour ultrasonic oscillation test was conducted. As a result, no abnormality was observed in the joint between the ceramic plate and the metal, and there was only slight surface erosion of the ceramic plate, confirming that it had sufficient durability.

An alumina ceramic plate of 1.2w x 5mφ was bonded to the tip of a titanium horn using the same brazing material as in Example 1 and using the same method. Next, a durability test was conducted on this horn in the same manner as in Example 1, but as in Example 2, there was only slight corrosion on the surface of the cera ξ, and no abnormalities were observed in the joints. The durability of this horn was found to be good. Using a phenolic organic adhesive manufactured by Cemedai-In Co., Ltd., the tip of the horn made of Mihara Egami titanium is 50° + φ, and
．． A product with alumina ceramic plates glued together was fabricated. This horn was also subjected to the same durability test as in Example 2, and it was found that the ceramic plate did not peel off, and even organic adhesives with good adhesive properties could withstand use. Ta. At the tip of a titanium horn in the same manner as in Example 4,
A 5.0 sa L x 50 mφ alumina ceramic ξ plate was bonded to produce a material. Example 2 for this horn
A similar durability test was conducted. However, in the case of this comparative example, the ceramic plate peeled off approximately 24 hours after the start of the durability test. As mentioned above, this is thought to be because the bonded Ceramic plates were too +yl-, and a large stress was applied to the bonded area due to ultrasonic oscillation. If the ceramic plate is made thicker in this way, a large force will be applied to the part where it is bonded to the metal due to vibrations, so from the viewpoint of the durability of the bond, the thickness of the ceramic plate to be bonded should be as thin as possible. It turns out that things are preferable. However, if it is too thin, the usable time will be shortened to avoid breakage or erosion during adhesion, so normally 0.3 to 1.5 ms+ is preferable, especially when using organic adhesive. has poor water resistance and solvent resistance compared to metal, and easily deteriorates, so in order to avoid peeling, it is better to use a thin material with a thickness of about 0.3 to 0.8 m, which has better durability against peeling. You get something. [Effects of the Invention] By bonding a ceramic plate such as alumina or zirconia to the horn 9t of the ultrasonic homogenizer according to the present invention, contamination of the dispersed material due to horn erosion is reduced and durability is improved. This makes it possible.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of the present invention. 1 ·Horn 2 ・Cera ξ Tux board

Claims (2)

[Claims] (1) Ultrasonic vibration transmission horn characterized by having a ceramic plate bonded to the tip of the ultrasonic vibration transmission horn (2) As a ceramic board for adhesion, the thickness is 0.05~
The ultrasonic vibration transmission horn according to claim 1, characterized in that a 3 mm horn is used.