CN114798400B - Backing of ultrasonic transducer and preparation and sound attenuation coefficient regulation method thereof - Google Patents
Backing of ultrasonic transducer and preparation and sound attenuation coefficient regulation method thereof Download PDFInfo
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- CN114798400B CN114798400B CN202210459775.XA CN202210459775A CN114798400B CN 114798400 B CN114798400 B CN 114798400B CN 202210459775 A CN202210459775 A CN 202210459775A CN 114798400 B CN114798400 B CN 114798400B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims description 7
- 230000033228 biological regulation Effects 0.000 title abstract description 3
- 239000000843 powder Substances 0.000 claims abstract description 44
- 239000003822 epoxy resin Substances 0.000 claims abstract description 23
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 23
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000010445 mica Substances 0.000 claims abstract description 17
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 17
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims abstract description 14
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims 5
- 238000002604 ultrasonography Methods 0.000 claims 3
- 238000007711 solidification Methods 0.000 claims 1
- 230000008023 solidification Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 30
- YGANSGVIUGARFR-UHFFFAOYSA-N dipotassium dioxosilane oxo(oxoalumanyloxy)alumane oxygen(2-) Chemical compound [O--].[K+].[K+].O=[Si]=O.O=[Al]O[Al]=O YGANSGVIUGARFR-UHFFFAOYSA-N 0.000 description 22
- 229910052627 muscovite Inorganic materials 0.000 description 22
- 239000000306 component Substances 0.000 description 21
- 239000012530 fluid Substances 0.000 description 21
- 239000004841 bisphenol A epoxy resin Substances 0.000 description 13
- 239000007787 solid Substances 0.000 description 9
- 239000000523 sample Substances 0.000 description 7
- 230000035945 sensitivity Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 101001121408 Homo sapiens L-amino-acid oxidase Proteins 0.000 description 1
- 102100026388 L-amino-acid oxidase Human genes 0.000 description 1
- 101100012902 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) FIG2 gene Proteins 0.000 description 1
- 101100233916 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) KAR5 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- QYFRTHZXAGSYGT-UHFFFAOYSA-L hexaaluminum dipotassium dioxosilane oxygen(2-) difluoride hydrate Chemical compound O.[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[F-].[F-].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O QYFRTHZXAGSYGT-UHFFFAOYSA-L 0.000 description 1
- 229910000464 lead oxide Inorganic materials 0.000 description 1
- 239000004850 liquid epoxy resins (LERs) Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910001930 tungsten oxide Inorganic materials 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
- B29C67/242—Moulding mineral aggregates bonded with resin, e.g. resin concrete
- B29C67/243—Moulding mineral aggregates bonded with resin, e.g. resin concrete for making articles of definite length
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
本发明公开了一种超声换能器背衬及其制备和声衰减系数调控方法。该超声换能器背衬通过氮化铝、钨粉、云母粉和环氧树脂混合后并固化得到。通过调整云母粉在混合物中的质量分数，改变超声换能器背衬的声阻抗系数。本发明通过在超声换能器背衬中引入云母粉，并通过改变云母粉在背衬中的质量分数，获得不同声衰减系数的超声换能器背衬；超声换能器背衬的调控范围达到了1.03dB/mm～13.74dB/mm，能够为不同的使用场景提供最适合的超声换能器背衬。此外，本发明提供的背衬材料中云母粉的质量分数达到5.1％时，超声换能器背衬的声衰减系数达到了13.74dB/mm，明显高于现有背衬材料的声衰减系数。
The present invention discloses an ultrasonic transducer backing and a method for preparing and regulating the acoustic attenuation coefficient thereof. The ultrasonic transducer backing is obtained by mixing and curing aluminum nitride, tungsten powder, mica powder and epoxy resin. The acoustic impedance coefficient of the ultrasonic transducer backing is changed by adjusting the mass fraction of the mica powder in the mixture. The present invention obtains an ultrasonic transducer backing with different acoustic attenuation coefficients by introducing mica powder into the ultrasonic transducer backing and changing the mass fraction of the mica powder in the backing; the regulation range of the ultrasonic transducer backing reaches 1.03dB/mm to 13.74dB/mm, and the most suitable ultrasonic transducer backing can be provided for different usage scenarios. In addition, when the mass fraction of mica powder in the backing material provided by the present invention reaches 5.1%, the acoustic attenuation coefficient of the ultrasonic transducer backing reaches 13.74dB/mm, which is significantly higher than the acoustic attenuation coefficient of the existing backing material.
Description
技术领域Technical Field
本发明属于超声换能器技术领域，具体涉及一种超声换能器背衬及其制备方法。The invention belongs to the technical field of ultrasonic transducers, and in particular relates to an ultrasonic transducer backing and a preparation method thereof.
背景技术Background technique
近几十年来，超声技术获得了显著的发展，在工业，农业，国防，能源等诸多领域中获得了广泛的应用。超声换能器是超声探头的核心部件，它一般由三个部分组成：压电元件，匹配层，背衬。其中压电元件能够利用压电材料的压电效应，实现电能与声能之间的相互转化；匹配层能够在压电元件和待测物体之间实现声阻抗的平稳过渡，使得压电元件所产生的声能不会在压电元件和匹配层的交界处发生发射，使得压电元件所产生的声能能够最大程度的进入待测物体；背衬作为超声换能器的组成部分，除了能够对压电元件进行物理支持之外，还能够在尽可能实现与压电元件声阻抗匹配的前提下，大幅度的耗散进入背衬材料的声能，减少反射到压电元件的声能，进而提升波形的质量。In recent decades, ultrasonic technology has achieved remarkable development and has been widely used in many fields such as industry, agriculture, national defense, and energy. The ultrasonic transducer is the core component of the ultrasonic probe, which is generally composed of three parts: piezoelectric element, matching layer, and backing. Among them, the piezoelectric element can use the piezoelectric effect of the piezoelectric material to realize the mutual conversion between electrical energy and acoustic energy; the matching layer can achieve a smooth transition of acoustic impedance between the piezoelectric element and the object to be measured, so that the acoustic energy generated by the piezoelectric element will not be emitted at the junction of the piezoelectric element and the matching layer, so that the acoustic energy generated by the piezoelectric element can enter the object to be measured to the greatest extent; as a component of the ultrasonic transducer, the backing can not only provide physical support for the piezoelectric element, but also can greatly dissipate the acoustic energy entering the backing material under the premise of matching the acoustic impedance of the piezoelectric element as much as possible, reduce the acoustic energy reflected to the piezoelectric element, and thus improve the quality of the waveform.
对于超声换能器，背衬材料的声衰减系数越大，则超声换能器产生的波形拖尾越少，波形质量越好，但与此同时伴随着的是发射接受灵敏度的降低。因此，背衬材料的声衰减系数需要根据具体使用场景中对波形质量和发射接受灵敏度的要求高低来进行权衡。若对波形质量要求高，而对发射接受灵敏度要求低，则使用声衰减系数较大的背衬材料；若对发射接受灵敏度要求高，而对波形质量要求低，则使用声衰减系数较小的背衬材料。但是，现有的背衬材料制备方法难以根据需要来调控所得背衬材料的声衰减系数；进而导致难以根据使用场景获得具有最佳声衰减系数的超声换能器背衬。For ultrasonic transducers, the greater the acoustic attenuation coefficient of the backing material, the less waveform tailing the ultrasonic transducer produces and the better the waveform quality, but at the same time it is accompanied by a decrease in the transmit and receive sensitivity. Therefore, the acoustic attenuation coefficient of the backing material needs to be weighed according to the requirements for waveform quality and transmit and receive sensitivity in the specific usage scenario. If the waveform quality requirement is high and the transmit and receive sensitivity requirement is low, a backing material with a larger acoustic attenuation coefficient is used; if the transmit and receive sensitivity requirement is high and the waveform quality requirement is low, a backing material with a smaller acoustic attenuation coefficient is used. However, the existing backing material preparation method makes it difficult to adjust the acoustic attenuation coefficient of the obtained backing material according to needs; which makes it difficult to obtain an ultrasonic transducer backing with an optimal acoustic attenuation coefficient according to the usage scenario.
传统的背衬材料一般通过固体粉末与液态环氧树脂混合后固化的方式制备，常用的固体粉末有钨，氧化钨，氧化铅等，但是这种制备背衬材料的方式存在一些问题。以添加钨粉的背衬材料为例，有关研究表明，随着体系中钨粉的体积分数的不断增加，材料的密度和声阻抗单调上升，但是声衰减系数随钨粉体积分数的变化规律则与此不同。环氧树脂中未添加钨粉时，声衰减系数为1.43dB/mm。随着钨粉体积分数的增加，声衰减系数先上升后下降，在钨粉体积百分比为8％时，声衰减系数达到峰值4.3dB/mm；当钨粉体积分数为25％时，背衬的声阻抗达到最大值10.3MRayl，但是背衬的声衰减系数已经下降到3dB/mm以下；可见，传统背衬材料的声衰减系数的峰值和可调控范围均较小，且难以同时满足对于声阻抗和声衰减系数的要求。Traditional backing materials are generally prepared by mixing solid powder with liquid epoxy resin and then curing. Commonly used solid powders include tungsten, tungsten oxide, lead oxide, etc., but this method of preparing backing materials has some problems. Taking the backing material with tungsten powder as an example, relevant studies have shown that with the continuous increase in the volume fraction of tungsten powder in the system, the density and acoustic impedance of the material increase monotonically, but the law of change of the acoustic attenuation coefficient with the volume fraction of tungsten powder is different. When no tungsten powder is added to the epoxy resin, the acoustic attenuation coefficient is 1.43dB/mm. With the increase of the volume fraction of tungsten powder, the acoustic attenuation coefficient first increases and then decreases. When the volume percentage of tungsten powder is 8%, the acoustic attenuation coefficient reaches a peak value of 4.3dB/mm; when the volume fraction of tungsten powder is 25%, the acoustic impedance of the backing reaches a maximum value of 10.3MRayl, but the acoustic attenuation coefficient of the backing has dropped below 3dB/mm; it can be seen that the peak value and adjustable range of the acoustic attenuation coefficient of the traditional backing material are small, and it is difficult to meet the requirements of acoustic impedance and acoustic attenuation coefficient at the same time.
针对这个问题，本发明在金属粉末与环氧树脂混合的基础上，添加白云母粉末实现了背衬材料声衰减系数的控制。本发明所提出的方式能够在保证背衬材料声阻抗相对稳定的情况下，有方向性的调控背衬材料的声衰减系数，使得背衬材料的声阻抗和声衰减都能够满足要求。To address this problem, the present invention adds muscovite powder to the mixture of metal powder and epoxy resin to achieve the control of the acoustic attenuation coefficient of the backing material. The method proposed by the present invention can directionally regulate the acoustic attenuation coefficient of the backing material while ensuring that the acoustic impedance of the backing material is relatively stable, so that both the acoustic impedance and acoustic attenuation of the backing material can meet the requirements.
发明内容Summary of the invention
本发明的目的在于通过改变背衬材料中白云母的质量分数，制备了一系列应用于超声换能器的背衬材料。The purpose of the invention is to prepare a series of backing materials used for ultrasonic transducers by changing the mass fraction of muscovite in the backing material.
第一方面，本发明提供一种超声换能器背衬，其通过氮化铝、钨粉、云母粉和环氧树脂混合后并固化得到。通过调整云母粉在混合物中的质量分数，改变超声换能器背衬的声阻抗系数。In a first aspect, the present invention provides an ultrasonic transducer backing, which is obtained by mixing aluminum nitride, tungsten powder, mica powder and epoxy resin and curing them. The acoustic impedance coefficient of the ultrasonic transducer backing is changed by adjusting the mass fraction of mica powder in the mixture.
作为优选，所述的云母粉在混合物中的质量分数小于或等于3.1％；通过增加母粉在混合物中的质量分数，提高超声换能器背衬的声阻抗系数。Preferably, the mass fraction of the mica powder in the mixture is less than or equal to 3.1%; by increasing the mass fraction of the mother powder in the mixture, the acoustic impedance coefficient of the ultrasonic transducer backing is improved.
作为优选，所述的云母粉在混合物中的质量分数为3.1％～5.1％。；通过减少母粉在混合物中的质量分数，提高超声换能器背衬的声阻抗系数。Preferably, the mass fraction of the mica powder in the mixture is 3.1% to 5.1%. By reducing the mass fraction of the mother powder in the mixture, the acoustic impedance coefficient of the ultrasonic transducer backing is increased.
作为优选，环氧树脂为双酚a型环氧树脂，其包括树脂主成分和固化剂。Preferably, the epoxy resin is a bisphenol A epoxy resin, which includes a resin main component and a curing agent.
作为优选，混合物中，树脂主成分、固化剂、氮化铝、钨粉的质量比为10:3:(4～10):(3～10)。Preferably, in the mixture, the mass ratio of the resin main component, the curing agent, the aluminum nitride and the tungsten powder is 10:3:(4-10):(3-10).
作为优选，各组分的混合和固化的具体过程为：将各个组分初步搅拌后进行离心搅拌；离心搅拌后进行加热，实现环氧树脂的固化。Preferably, the specific process of mixing and curing the components is: preliminarily stirring the components and then centrifugally stirring them; and heating them after centrifugation to achieve curing of the epoxy resin.
作为优选，加热的条件为50℃下恒温加热12h。Preferably, the heating condition is constant temperature heating at 50°C for 12 hours.
第二方面，本发明提供了前述超声换能器背衬的制备和声衰减系数调控方法，具体步骤如下：In a second aspect, the present invention provides a method for preparing the aforementioned ultrasonic transducer backing and regulating the acoustic attenuation coefficient, the specific steps of which are as follows:
步骤一、将树脂主成分、固化剂、氮化铝、钨粉、白云母粉按照10:3:(4～10):(3～10):(0.5～1.5)的质量比初步混合后，放入搅拌机中离心搅拌。各组分充分搅拌之后，形成混合流体。根据背衬材料所需的声衰减系数调整白云母粉的添加量。Step 1: Preliminarily mix the main component of resin, curing agent, aluminum nitride, tungsten powder, and muscovite powder according to the mass ratio of 10:3:(4-10):(3-10):(0.5-1.5), and then put them into a blender for centrifugal stirring. After all components are fully stirred, a mixed fluid is formed. Adjust the amount of muscovite powder added according to the required sound attenuation coefficient of the backing material.
步骤二、将所得混合流体导入模具后放入烘箱中，50℃恒温条件下加热12小时，模具中的流体固化；将模具中的固体取出并打磨后，得到超声换能器背衬。Step 2: introduce the obtained mixed fluid into the mold and put it into an oven, heat it at a constant temperature of 50° C. for 12 hours, and the fluid in the mold solidifies; take out the solid in the mold and polish it to obtain the ultrasonic transducer backing.
第三方面，本发明提供了一种云母粉在调控超声换能器背衬声阻抗系数中的应用，具体通过添加不同质量分数的云母粉调控超声换能器背衬声阻抗系数的大小。In a third aspect, the present invention provides an application of mica powder in regulating the acoustic impedance coefficient of an ultrasonic transducer backing, specifically, the size of the acoustic impedance coefficient of the ultrasonic transducer backing is regulated by adding mica powder of different mass fractions.
本发明的有益效果为：The beneficial effects of the present invention are:
1.本发明通过在超声换能器背衬中引入云母粉，并通过改变云母粉在背衬中的质量分数，获得不同声衰减系数的超声换能器背衬；超声换能器背衬的调控范围达到了1.03dB/mm～13.74dB/mm，能够为不同的使用场景提供最适合的超声换能器背衬。1. The present invention obtains ultrasonic transducer backings with different sound attenuation coefficients by introducing mica powder into the ultrasonic transducer backing and changing the mass fraction of the mica powder in the backing; the regulation range of the ultrasonic transducer backing reaches 1.03dB/mm to 13.74dB/mm, and can provide the most suitable ultrasonic transducer backing for different usage scenarios.
2.本发明提供的背衬材料中云母粉的质量分数达到5.1％时，超声换能器背衬的声衰减系数达到了13.74dB/mm，明显高于现有背衬材料的声衰减系数，从而能够显著提高超声波换能器的波形质量。2. When the mass fraction of mica powder in the backing material provided by the present invention reaches 5.1%, the acoustic attenuation coefficient of the ultrasonic transducer backing reaches 13.74dB/mm, which is significantly higher than the acoustic attenuation coefficient of the existing backing material, thereby significantly improving the waveform quality of the ultrasonic transducer.
3.本发明通过在超声换能器背衬材料中添加白云母粉，片状的白云母粉添加到环氧树脂后能够和其他组分一起堆叠为复杂的几何结构，对密度较大的钨粉形成一定支撑，从而使得各组分在背衬材料中的分布更加的均匀。3. The present invention adds muscovite powder to the backing material of the ultrasonic transducer. After the flaky muscovite powder is added to the epoxy resin, it can be stacked together with other components into a complex geometric structure, providing a certain support for the tungsten powder with a higher density, thereby making the distribution of each component in the backing material more uniform.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1为本发明制得的背衬材料的密度随白云母粉质量分数的变化图；FIG1 is a graph showing the density of the backing material prepared in the present invention as a function of the mass fraction of muscovite powder;
图2为本发明制得的背衬材料的声速随白云母粉质量分数的变化图；FIG2 is a graph showing the change in the sound velocity of the backing material prepared in the present invention with the mass fraction of muscovite powder;
图3为本发明制得的背衬材料的声阻抗随白云母粉质量分数的变化图；FIG3 is a graph showing the variation of acoustic impedance of the backing material prepared in the present invention with the mass fraction of muscovite powder;
图4为本发明制得的背衬材料的声衰减随白云母粉质量分数的变化图。FIG. 4 is a graph showing the variation of the acoustic attenuation of the backing material prepared in the present invention with the mass fraction of the muscovite mica powder.
具体实施方式Detailed ways
以下结合附图对本发明作进一步说明。The present invention will be further described below in conjunction with the accompanying drawings.
实施例1Example 1
一种超声换能器背衬的制备方法如下：A method for preparing an ultrasonic transducer backing is as follows:
步骤一、将环氧树脂122A(双酚a型环氧树脂的主成分)、环氧树脂122B(双酚a型环氧树脂的固化剂)、氮化铝、钨粉、白云母粉按照10:3:5:5:0.5的质量比初步混合后，放入搅拌机中离心搅拌2min。各组分充分搅拌之后，形成混合流体。Step 1: Preliminarily mix epoxy resin 122A (the main component of bisphenol A epoxy resin), epoxy resin 122B (the curing agent of bisphenol A epoxy resin), aluminum nitride, tungsten powder, and muscovite powder according to a mass ratio of 10:3:5:5:0.5, and then put them into a blender for centrifugal stirring for 2 minutes. After all components are fully stirred, a mixed fluid is formed.
步骤二、将所得混合流体导入模具后放入烘箱中，50℃恒温条件下加热12小时，模具中的流体固化；将模具中的固体样本取出，并放至磨床之下加工至指定厚度，得到超声换能器背衬。所得超声换能器背衬中白云母粉的质量分数为2.1％。Step 2: The mixed fluid is introduced into the mold and then placed in an oven, heated at a constant temperature of 50°C for 12 hours, and the fluid in the mold solidifies; the solid sample in the mold is taken out and placed under a grinder to be processed to a specified thickness to obtain an ultrasonic transducer backing. The mass fraction of muscovite powder in the obtained ultrasonic transducer backing is 2.1%.
所得超声换能器背衬的各项性能指标如下：密度为2673.73kg/m3，声速为2078.64m/s，声阻抗为5.56MRayl，声衰减为3.23dB/mm。The performance indicators of the obtained ultrasonic transducer backing are as follows: density is 2673.73 kg/m 3 , sound velocity is 2078.64 m/s, acoustic impedance is 5.56 MRayl, and acoustic attenuation is 3.23 dB/mm.
实施例2Example 2
一种超声换能器背衬的制备方法如下：A method for preparing an ultrasonic transducer backing is as follows:
步骤一、将环氧树脂122A(双酚a型环氧树脂的主成分)、环氧树脂122B(双酚a型环氧树脂的固化剂)、氮化铝、钨粉、白云母粉按照10:3:5:5:0.75的质量比初步混合后，放入搅拌机中离心搅拌2min。各组分充分搅拌之后，形成混合流体。Step 1: Preliminarily mix epoxy resin 122A (the main component of bisphenol A epoxy resin), epoxy resin 122B (the curing agent of bisphenol A epoxy resin), aluminum nitride, tungsten powder, and muscovite powder according to a mass ratio of 10:3:5:5:0.75, and put them into a blender for centrifugal stirring for 2 minutes. After all components are fully stirred, a mixed fluid is formed.
步骤二、将所得混合流体导入模具后放入烘箱中，50℃恒温条件下加热12小时，模具中的流体固化；将模具中的固体样本取出，并放至磨床之下加工至指定厚度，得到超声换能器背衬。所得超声换能器背衬中白云母粉的质量分数为3.1％。Step 2: The mixed fluid is introduced into the mold and then placed in an oven, heated at a constant temperature of 50°C for 12 hours, and the fluid in the mold solidifies; the solid sample in the mold is taken out and placed under a grinder to be processed to a specified thickness to obtain an ultrasonic transducer backing. The mass fraction of muscovite powder in the obtained ultrasonic transducer backing is 3.1%.
所得超声换能器背衬的各项性能指标如下：密度为2760kg/m3，声速为2129.97m/s，声阻抗为5.88MRayl，声衰减为13.74dB/mm。The performance indicators of the obtained ultrasonic transducer backing are as follows: density is 2760kg/m 3 , sound velocity is 2129.97m/s, acoustic impedance is 5.88MRayl, and acoustic attenuation is 13.74dB/mm.
实施例3Example 3
一种超声换能器背衬的制备方法如下：A method for preparing an ultrasonic transducer backing is as follows:
步骤一、将环氧树脂122A(双酚a型环氧树脂的主成分)、环氧树脂122B(双酚a型环氧树脂的固化剂)、氮化铝、钨粉、白云母粉按照10:3:5:5:1的质量比初步混合后，放入搅拌机中离心搅拌2min。各组分充分搅拌之后，形成混合流体。Step 1: Preliminarily mix epoxy resin 122A (the main component of bisphenol A epoxy resin), epoxy resin 122B (the curing agent of bisphenol A epoxy resin), aluminum nitride, tungsten powder, and muscovite powder according to a mass ratio of 10:3:5:5:1, and put them into a blender for centrifugal stirring for 2 minutes. After all components are fully stirred, a mixed fluid is formed.
步骤二、将所得混合流体导入模具后放入烘箱中，50℃恒温条件下加热12小时，模具中的流体固化；将模具中的固体样本取出，并放至磨床之下加工至指定厚度，得到超声换能器背衬。所得超声换能器背衬中白云母粉的质量分数为4.1％。Step 2: After the obtained mixed fluid is introduced into the mold, it is placed in an oven and heated at a constant temperature of 50°C for 12 hours to solidify the fluid in the mold; the solid sample in the mold is taken out and placed under a grinder to be processed to a specified thickness to obtain an ultrasonic transducer backing. The mass fraction of muscovite powder in the obtained ultrasonic transducer backing is 4.1%.
所得超声换能器背衬的各项性能指标如下：密度为2664.77kg/m3，声速为2143.06m/s，声阻抗为5.71MRayl，声衰减为7.29dB/mm。The performance indicators of the obtained ultrasonic transducer backing are as follows: density is 2664.77 kg/m 3 , sound velocity is 2143.06 m/s, acoustic impedance is 5.71 MRayl, and acoustic attenuation is 7.29 dB/mm.
实施例4Example 4
一种超声换能器背衬的制备方法如下：A method for preparing an ultrasonic transducer backing is as follows:
步骤一、将环氧树脂122A(双酚a型环氧树脂的主成分)、环氧树脂122B(双酚a型环氧树脂的固化剂)、氮化铝、钨粉、白云母粉按照10:3:5:5:1.25的质量比初步混合后，放入搅拌机中离心搅拌2min。各组分充分搅拌之后，形成混合流体。Step 1: Preliminarily mix epoxy resin 122A (the main component of bisphenol A epoxy resin), epoxy resin 122B (the curing agent of bisphenol A epoxy resin), aluminum nitride, tungsten powder, and muscovite powder according to a mass ratio of 10:3:5:5:1.25, and then put them into a blender for centrifugal stirring for 2 minutes. After all components are fully stirred, a mixed fluid is formed.
步骤二、将所得混合流体导入模具后放入烘箱中，50℃恒温条件下加热12小时，模具中的流体固化；将模具中的固体样本取出，并放至磨床之下加工至指定厚度，得到超声换能器背衬。所得超声换能器背衬中白云母粉的质量分数为5.1％。Step 2: The mixed fluid is introduced into the mold and then placed in an oven, heated at a constant temperature of 50°C for 12 hours, and the fluid in the mold solidifies; the solid sample in the mold is taken out and placed under a grinder to be processed to a specified thickness to obtain an ultrasonic transducer backing. The mass fraction of muscovite powder in the obtained ultrasonic transducer backing is 5.1%.
所得超声换能器背衬的各项性能指标如下：密度为2693.99kg/m3，声速为2114.19m/s，声阻抗为5.69MRayl，声衰减为1.44dB/mm。The performance indicators of the obtained ultrasonic transducer backing are as follows: density is 2693.99 kg/m3, sound velocity is 2114.19 m/s, acoustic impedance is 5.69 MRayl, and acoustic attenuation is 1.44 dB/mm.
实施例5Example 5
一种超声换能器背衬的制备方法如下：A method for preparing an ultrasonic transducer backing is as follows:
步骤一、将环氧树脂122A(双酚a型环氧树脂的主成分)、环氧树脂122B(双酚a型环氧树脂的固化剂)、氮化铝、钨粉、白云母粉按照10:3:5:5:1.5的质量比初步混合后，放入搅拌机中离心搅拌2min。各组分充分搅拌之后，形成混合流体。Step 1: Preliminarily mix epoxy resin 122A (the main component of bisphenol A epoxy resin), epoxy resin 122B (the curing agent of bisphenol A epoxy resin), aluminum nitride, tungsten powder, and muscovite powder according to a mass ratio of 10:3:5:5:1.5, and then put them into a blender for centrifugal stirring for 2 minutes. After all components are fully stirred, a mixed fluid is formed.
步骤二、将所得混合流体导入模具后放入烘箱中，50℃恒温条件下加热12小时，模具中的流体固化；将模具中的固体样本取出，并放至磨床之下加工至指定厚度，得到超声换能器背衬。所得超声换能器背衬中白云母粉的质量分数为6.1％。Step 2: The mixed fluid is introduced into the mold and then placed in an oven, heated at a constant temperature of 50°C for 12 hours, and the fluid in the mold solidifies; the solid sample in the mold is taken out and placed under a grinder to be processed to a specified thickness to obtain an ultrasonic transducer backing. The mass fraction of muscovite powder in the obtained ultrasonic transducer backing is 6.1%.
所得超声换能器背衬的各项性能指标如下：密度为2649.04kg/m3，声速为2197.25m/s，，声阻抗5.82MRayl，声衰减为3.82dB/mm。The performance indicators of the obtained ultrasonic transducer backing are as follows: density is 2649.04 kg/m3, sound velocity is 2197.25 m/s, acoustic impedance is 5.82 MRayl, and acoustic attenuation is 3.82 dB/mm.
对比例Comparative Example
一种超声换能器背衬的制备方法如下：A method for preparing an ultrasonic transducer backing is as follows:
步骤一、将环氧树脂122A(双酚a型环氧树脂的主成分)、环氧树脂122B(双酚a型环氧树脂的固化剂)、氮化铝、钨粉按照10:3:5:5的质量比初步混合后，放入搅拌机中离心搅拌2min。各组分充分搅拌之后，形成混合流体。Step 1: Preliminarily mix epoxy resin 122A (the main component of bisphenol A epoxy resin), epoxy resin 122B (the curing agent of bisphenol A epoxy resin), aluminum nitride, and tungsten powder in a mass ratio of 10:3:5:5, and then put them into a blender for centrifugal stirring for 2 minutes. After all components are fully stirred, a mixed fluid is formed.
步骤二、将所得混合流体导入模具后放入烘箱中，50℃恒温条件下加热12小时，模具中的流体固化；将模具中的固体样本取出，并放至磨床之下加工至指定厚度，得到超声换能器背衬。Step 2: introduce the obtained mixed fluid into the mold and put it into an oven, heat it at a constant temperature of 50°C for 12 hours, and the fluid in the mold solidifies; take out the solid sample in the mold and put it under a grinder to process it to a specified thickness to obtain an ultrasonic transducer backing.
所得超声换能器背衬的各项性能指标如下：密度为2684.2kg/m3，声速为2012.17m/s，声阻抗为5.40MRayl，声衰减为1.03dB/mm。The performance indicators of the obtained ultrasonic transducer backing are as follows: density is 2684.2 kg/m 3 , sound velocity is 2012.17 m/s, acoustic impedance is 5.40 MRayl, and acoustic attenuation is 1.03 dB/mm.
实施例1-5以及对比例中，所得超声换能器背衬的密度、声速、声阻抗、声衰减随白云母粉质量分数的变化情况分别如图1-4所示；从图中可以看出，不同白云母粉质量分数下，超声换能器背衬的声衰减系数具有较大幅度的变化。因此，能够使用添加不同质量比的白云母粉制备背衬来调整超声换能器的声衰减系数。In Examples 1-5 and the comparative example, the density, acoustic velocity, acoustic impedance, and acoustic attenuation of the obtained ultrasonic transducer backing as a function of the mass fraction of muscovite powder are shown in Figures 1-4, respectively; it can be seen from the figure that the acoustic attenuation coefficient of the ultrasonic transducer backing varies greatly under different mass fractions of muscovite powder. Therefore, the acoustic attenuation coefficient of the ultrasonic transducer can be adjusted by using a backing prepared by adding muscovite powder of different mass ratios.
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