KR20240020048A - Materials and methods of manufacturing materials that absorb radar wavelength rays - Google Patents

Abstract

The present disclosure relates to compositions that absorb radar. Specifically, carbonate minerals; calcium carbonate; strontium; sulfur; bromine; copper; steel; and an eco-friendly adhesive; when the composition is coated on an aluminum plate and irradiated with radar, the reflectance converges to almost 0, and on the contrary, the radar absorption rate approaches 100%, thereby It can be used in stealth fighters that cannot be detected.

Description

Materials and methods of manufacturing materials that absorb radar wavelength rays {omitted}

The present disclosure relates to radar absorbing compositions.

Generally, when electromagnetic waves hit radar-absorbent materials (RAM), they penetrate into the material and continue to be reflected within it, but cannot escape to the outside. In other words, electromagnetic waves are captured by this material and continue to be reflected inside the material, eventually being converted into heat energy.

Due to this effect, it is widely used for military purposes to prevent enemy radar radio waves from returning, and is also used for civilian purposes to solve the problem of scattered radio waves.

However, for this purpose, it is not easy to find the specific ingredients, the manufacturing method, the ingredients and their contents of each composition, and according to the present disclosure, a composition having such effects is disclosed.

Republic of Korea Patent Publication No. 10-2014-0116397 (published on October 2, 2014) International Publication No. WO/2009/065031 (published on May 22, 2009) Japanese Patent Publication No. 2007-524840 (published on August 30, 2007)

The present disclosure is intended to solve the problems of the prior art described above, and its purpose is to provide a composition that absorbs radar and prevents it from being reflected.

However, the technical problem to be achieved by the present disclosure is not limited to the technical problems described above, and other technical problems may exist.

According to one embodiment of the present disclosure, carbonate minerals; calcium carbonate; strontium; sulfur; bromine; copper; A radar absorbing composition composed of iron is taken as an example.

The elemental ratio of the radar absorbing composition may be composed of more than 99% calcium (Ca), and the elemental proportions of the remaining elements excluding calcium may be less than 1%.

Preferably, it is composed of 99.313% calcium (Ca), 0.419% strontium (Sr), 0.111% sulfur (S), 0.064% bromine (Br), 0.061% copper (Cu), and 0.032% iron (Fe). A radar absorbing composition that does this is taken as an example.

In addition, the radar absorbing composition further includes an environmentally friendly adhesive, and the environmentally friendly adhesive is an example of a radar absorbing composition, which is characterized in that it is a root component of marine aquatic plants.

These radar absorbing compositions include Myalinida, Colpomyida, Cyrtodontida, Pectinida, Ostreida, and Arcida of the Pteriomorphia. An example is a radar absorbing composition, characterized in that it is manufactured using at least one shell included in one of the order Limida and Mytilida.

The radar absorbing composition is characterized in that it is prepared in powder form by drying and pulverizing the shell of at least one clam.

In addition, an example is a radar absorbing composition, wherein the marine aquatic plant is at least one of kelp, seaweed, or hijiki.

In addition to this, another method for implementing the present disclosure, another system, and a computer-readable recording medium recording a computer program for executing the method may be further provided.

According to the problem solving means of the present disclosure described above, it is possible to provide a composition that absorbs radar and prevents it from being reflected. In addition, at least one clam included in the airfoil subclass constituting the composition is grown in water from birth until adulthood and has a water-friendly property, so it does not melt or weaken in contact with water, so it can be used in stealth submarines and stealth submarines. It can be used to improve radar detection capability in various fields, including battleships.

The effects of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned may be clearly understood by those skilled in the art from the description below.

FIG. 1 is a diagram illustrating a radar absorbent composition applied to an aluminum plate according to an exemplary embodiment of the present disclosure.

Below, with reference to the attached drawings, embodiments of the present disclosure are described in detail so that those skilled in the art (hereinafter referred to as skilled in the art) can easily implement the present disclosure. The embodiments presented in this disclosure are provided to enable any person skilled in the art to use or practice the subject matter of this disclosure. Accordingly, various modifications to the embodiments of the present disclosure will be apparent to those skilled in the art. That is, the present disclosure can be implemented in various different forms and is not limited to the following embodiments.

The same or similar reference numerals refer to the same or similar elements throughout the specification of this disclosure. Additionally, in order to clearly describe the present disclosure, reference numerals in the drawings may be omitted for parts that are not related to the description of the present disclosure.

As used in this disclosure, the term “or” is intended to mean an inclusive “or” and not an exclusive “or.” That is, unless otherwise specified in the present disclosure or the meaning is not clear from the context, “X uses A or B” should be understood to mean one of natural implicit substitutions. For example, unless otherwise specified in the present disclosure or the meaning is not clear from context, “X uses A or B” means that It can be interpreted as one of the cases where all B is used.

The term “and/or” as used in this disclosure should be understood to refer to and include all possible combinations of one or more of the listed related concepts.

The terms “comprise” and/or “comprising” as used in this disclosure should be understood to mean that certain features and/or elements are present. However, the terms "comprise" and/or "including" should be understood as not excluding the presence or addition of one or more other features, other components, and/or combinations thereof.

Unless otherwise specified in this disclosure or the context is clear to indicate a singular form, the singular should generally be construed to include “one or more.”

The term “Nth (N is a natural number)” used in the present disclosure can be understood as an expression used to distinguish the components of the present disclosure according to a predetermined standard such as a functional perspective, a structural perspective, or explanatory convenience. there is. For example, in the present disclosure, components performing different functional roles may be distinguished as first components or second components. However, components that are substantially the same within the technical spirit of the present disclosure but must be distinguished for convenience of explanation may also be distinguished as first components or second components.

Meanwhile, the term "module" or "unit" used in this disclosure refers to a computer-related entity, firmware, software or part thereof, hardware or part thereof. , can be understood as a term referring to an independent functional unit that processes resources such as a combination of software and hardware. At this time, the “module” or “unit” may be a unit composed of a single element, or may be a unit expressed as a combination or set of multiple elements. For example, a "module" or "part" in the narrow sense refers to a hardware element of a device, or a set of them, an application program that performs a specific function of software, a procedure implemented through the execution of software, or a program execution. It can refer to a set of instructions, etc. Additionally, as a broad concept, “module” or “unit” may refer to the device itself that constitutes the system, or the program itself that runs on the device. However, since the above-described concept is only an example, the concept of “module” or “unit” may be defined in various ways within a range understandable to those skilled in the art based on the contents of the present disclosure.

The term “connection” used in the present disclosure refers not only to the case where components are “directly connected,” but also to the case where other components exist in between, and “electrically connected” with another component in between. "It should be interpreted to include cases where it is.

The explanation of the foregoing terms is intended to aid understanding of the present disclosure. Therefore, if the above-mentioned terms are not explicitly described as limiting the content of the present disclosure, it should be noted that the content of the present disclosure is not used in the sense of limiting the technical idea. Hereinafter, the present disclosure will be described in detail with reference to the attached drawings.

According to one disclosure of the present invention, carbonate minerals; calcium carbonate; strontium; sulfur; bromine; copper; An example is a radar absorbing composition composed of iron.

The carbonate mineral refers to a mineral that dissolves when it reacts with an inorganic acid such as hydrochloric acid to generate carbon dioxide. It has carbonate ions (CO ₃ ^2- ) as the basic unit of its chemical composition, and representative examples include calcite, dolomite, and aragonite. Among these, calcite is a major constituent mineral of limestone and marble, and is produced as gangue in various hydrothermal vein deposits. Preferably, the carbonate mineral of the present disclosure may include calcite that exists in a solid state, and may in particular be derived from the shell of at least one clam of the subclass Pterosaur, which will be described later. At least one clam of the subclass Pteridophytes feeds, photosynthesizes and uses excrement to create the housing (i.e. shell) it needs for survival, based on calcite extracted from the shell of at least one clam of the subclass Pteridophyta, The composition according to the present disclosure was confirmed to have a significant effect on radar absorption, as shown in the experimental results described later.

Carbonate minerals are relatively soft and most widely distributed in the earth's crust. Crystals of carbonate minerals have physical properties that show different birefringence depending on the direction of measurement, have relatively vivid colors, and contain almost no moisture. When combined with a metallic element, such as iron in siderite, manganese in siderosite, strontium in strontianite, and zinc in siderosite, it may be included as a metallic mineral.

The calcium carbonate is an ionic compound consisting of calcium ions (Ca ²⁺ ) and carbonate ions (CO ₃ ^2- ). This compound is the main component of rock and exists in crystalline form, with calcite and aragonite accounting for most of it. It is the main component of pearls and seashells, and eggshells are also mostly composed of calcium carbonate. Calcium carbonate is relatively easy to obtain and is used in a variety of industrial fields. It is used as a mineral supply material for plant growth and is also used as an antacid to suppress excessive stomach acid.

The radar absorbing composition according to the present disclosure may include calcium (Ca) as a main element. In other words, the elemental ratio of the radar absorbing composition may be composed of more than 99% calcium (Ca), and the elemental ratio of the remaining elements excluding calcium may be less than 1%.

The strontium is a soft metal belonging to the alkaline earth metals, has a silvery white color mixed with light yellow, and is very reactive. Therefore, when exposed to air, a black oxide layer is easily formed. The specific ratio of each element will be described later.

In addition, it has similar physical and chemical properties to calcium or barium, which belong to the same group in the periodic table, and reacts with water to generate strontium hydroxide and hydrogen gas. Additionally, strontium metal burns in air to produce strontium oxide and strontium nitride, but below 380 degrees Celsius, it does not react with nitrogen and only produces oxide. When strontium metal is reacted under high oxygen pressure, strontium dioxide (SrO ₂ ) can be obtained along with strontium monoxide (SrO). Strontium hydroxide (Sr(OH) ₂ ), a hydroxide, is a strong base, but it is a somewhat weaker base than barium hydroxide or alkali metal hydroxides. It is also known to easily react with four types of halogen elements to produce dihalides.

The sulfur is a chalcogen element belonging to the 3rd period of group 16 of the periodic table. Its element symbol is S, its atomic weight is 32, its melting point is 115.21 degrees Celsius, and its boiling point is 444.6 degrees Celsius. It is mainly a yellow solid at room temperature, and when it burns, it emits a blue flame and produces sulfur dioxide (SO ₂ ), which has a very strong and foul odor. Many isotopes and isotopes exist.

The bromine is a reddish-brown element and maintains a liquid state at room temperature. The density of 1 liter of bromine is equivalent to the weight of 3 liters of water, and in its elemental state, it exists in the form of a diatomic molecule (Br2). Like all halogen (Group 17) elements, bromine is a nonmetal, but at high pressure it becomes a semimetal, showing good electrical and thermal conductivity and a metallic luster.

The copper is a transition metal belonging to the copper group elements of the 4th period of group 11 of the periodic table. Its element symbol is Cu, atomic weight is 63.546 g/mol, melting point is 1,084.62 degrees Celsius, boiling point is 2,562 degrees Celsius, and density is 8.94 g/cm ³ . It is a red, shiny metal that is relatively soft and has abundant malleability and ductility, making it easy to process. It has the second highest conductivity of heat and electricity after silver, so it is widely used in everyday life.

Iron, a transition metal with a silver-gray luster, is a major component of the Earth's core and is the second most abundant in the earth's crust after oxygen, silicon, and aluminum. Iron, the final element of nuclear fusion, is abundant in the earth's crust. Bronze, which has a low melting point, was used first in the history of human civilization, but iron has also been used since ancient times. In its natural state, iron mainly exists in iron ore in the form of oxides, and in its elemental state, it reacts with oxygen or water in the atmosphere to change into a reddish-brown hydrated oxide, commonly known as 'rust'. Iron mainly has oxidation states of +2 and +3 in compounds, but like ruthenium and osmium elements of the same group 8, it also exists in various states from -2 to +6. Pure iron is softer than aluminum, but when carbon is added during the smelting process, it becomes very hard and strong steel. Iron is the metal most widely used by mankind, needed to make ships, railroads, automobiles, buildings, roads, and bridges, as well as most machinery and tools. Additionally, iron is an essential element for almost all living things and is involved in respiration and oxidation-reduction reactions.

The radar absorbing composition according to the present disclosure is of the order Myalinida, Colpomyida, Cyrtodontida, Pectinida, Ostreida, and Order Pteriomorphia. It is manufactured using at least one clam included in the order Arcida, Limida, and Mytilida, and is characterized by living on rocks.

Specifically, the shells of these clams can be dried and then pulverized by manpower or mechanical force to prepare the composition according to the present disclosure in powder form. Preferably, the radar absorbing composition according to the present disclosure may be composed of a fine powder sieved through a sieve whose size is equal to or smaller than 0.2 mm ² . For example, the eyes can be implemented with a horizontal length of 0.44 mm or less and a vertical length of 0.44 mm or less. As a result, as will be described later, a composition can be made based on the powder form so that minimal radar reflection can be achieved by diffuse reflection rather than regular reflection. In addition, when the powder having fine particles as described above is mixed with an eco-friendly adhesive to be described later, the yield of the composition can be increased because it has a large mixing area.

As an example according to the present disclosure, the ratio of each element in the composition is 99.300 to 99.400% for calcium (Ca), 0.400 to 0.500% for strontium (Sr), 0.100 to 0.200% for sulfur (S), and bromine ( Br) may be 0.060 to 0.070%, copper (Cu) may be 0.060 to 0.070%, and iron (Fe) may be 0.030 to 0.040%.

As an example according to the present disclosure, as a result of FT-IR and It may be characterized as being composed of 0.111%, bromine (Br) 0.064%, copper (Cu) 0.061%, and iron (Fe) 0.032%.

In some cases, the radar absorbent composition according to the present disclosure may further include an eco-friendly adhesive.

The eco-friendly adhesive refers to one extracted from the root components of marine aquatic plants. In general, root components such as kelp, seaweed, and hijiki can be cultured and used as adhesive components.

The radar absorbing composition according to an embodiment of the present disclosure is a shell of at least one of the order Myalina, Colomia, Cyrtodonta, Cyrtodonta, Scallop, Oyster, Clam, Mantle and Mussel. It can be obtained by mixing dried and ground-based powder with an eco-friendly adhesive extracted from the root components of aquatic plants. Preferably, this radar absorbing composition is obtained by mixing 10 to 12 adult clams with a length of 5 cm to 8 cm and the eco-friendly adhesive in an amount of 30 liters to 55 liters based on the KF-21 Boramae fighter jet. It can be.

In detail, the element ratio experiment is explained.

[Preparation of samples]

[FT-IR analysis]

Powder-type samples were analyzed using a FT-IR spectrometer (Thermo, Niclet5700). As a result of library matching, it was determined that the sample was calcium carbonate (CaCO ₃ ). In addition, it was confirmed that the sample had a peak absorption value of 0.13 or more and 0.14 or less at wavenumbers of 1400 cm ^-1 or more and 1500 cm ^{-1 or} less.

[XRF analysis]

Samples of the powder formulation were analyzed using XRF (EDX-720). Accordingly, six elements were discovered, and the quantitative results are shown in the following [table].

[graph]

[Radar transmittance, reflectance, and absorption rate experiment]

The powdered mixture composed of the above six elements is mixed with an eco-friendly adhesive and coated on an aluminum plate. Then, electromagnetic waves are radiated from a radar to the coated aluminum plate to test reflectance, transmittance, and absorption rate.

At this time, reflectance (A) + transmittance (B) + absorption (C) = 1. At this time, the reflectance (A) of the sample converges to almost 0, and the transmittance (B) converges to 0, It was confirmed that the absorption rate (C) was close to 1 (i.e., absorption rate 100%). This can be re-expressed as incident energy (X1) = reflected energy (A1) + transmitted energy (B1) + absorbed energy (C1).

FIG. 1 is a diagram illustrating a radar absorbent composition applied to an aluminum plate according to an exemplary embodiment of the present disclosure. Referring to FIG. 1, the radar absorption composition according to an embodiment of the present disclosure has fine particles irregularly applied to an aluminum plate such as the surface of a fighter jet, absorbing at least 92% or more of the incident wave energy and absorbing a significant portion of the remaining energy (e.g., incident wave energy). Up to 8% of the wave energy) is consumed as diffusely reflected waves, and transmitted and regular reflected waves showed an energy distribution close to zero.

The foregoing description of the present disclosure is for illustrative purposes, and a person skilled in the art to which the present disclosure pertains will understand that the present disclosure can be easily modified into other specific forms without changing its technical spirit or essential features. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. For example, each component described as unitary may be implemented in a distributed manner, and similarly, components described as distributed may also be implemented in a combined form.

The scope of the present disclosure is indicated by the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present disclosure. .

Claims (2)

A powdered sample was made from a clam shell belonging to one order of the subclass Pteriomorphia, and the sample was analyzed using an inorganic element analyzer, XRF equipment, to determine six elements and their composition ratios.
Ca 99.313% Sr 0.419% S 0.111%
Br 0.064% Cu 0.061% Fe 0.032%
A radar absorbing composition that can be used on aircraft that cannot be detected by radar and absorbs 100% of radar waves by mixing this sample with an eco-friendly adhesive. In Paragraph 1, the sample is grown in seawater and has friendly properties with seawater, so it does not dissolve or weaken in seawater, so it cannot be captured by radar such as battleships, speedboats, amphibious armored vehicles, tanks, or guided weapons attached to the outside of radar base fighter jets. A radar absorbing composition that can be used in combat equipment, etc.