WO2021227184A1 - Process for manufacturing grating by adhering heavy-metal colloid to light-metal film - Google Patents

Abstract

Disclosed is a process for manufacturing a grating (7) by adhering a heavy-metal colloid to a light-metal film (1), which process relates to the field of optical elements. The manufacturing process comprises five main steps: preparing a heavy-metal colloid solution, adding a binder therein, adhering the heavy-metal colloid solution, manufacturing a composite film laminate, and cutting and packaging; and specifically involves: first preparing a heavy-metal salt to obtain a heavy-metal colloid; then adding the binder, which is easy to volatilize by means of heating, into the heavy-metal colloid to increase the viscosity of the heavy-metal colloid; passing a light-metal film (1) through the viscous heavy-metal colloid to obtain an adhesive light-metal film (1) with heavy-metal layers (2) adhered on two faces thereof; then alternating and folding the light-metal film (1) and the adhesive light-metal film (1) to obtain a composite film stack; and finally cutting and packaging the composite film stack to obtain a grating (7). The grating (7) has a short manufacturing cycle, is low cost, and has a convenient and quick manufacturing process. The manufactured structure does not collapse, a grating (7) of any area is manufactured by controlling the width of a light-metal plate, and an X-ray grating (7) can be mass produced via one instance of manufacturing.

Description

Grating manufacturing process with light metal film adhered to heavy metal colloid Technical field

The invention relates to the technical field of optical elements, in particular to a grating manufacturing process in which a light metal film adheres to a heavy metal colloid.

Background technique

X-ray imaging technology has been rapidly developed as a brand new discipline since the German researcher Roentgen discovered X-ray in 1895. It can detect internal defects of welds and equipment, and is widely used in machinery manufacturing, pressure vessels, and aviation. Aerospace, petroleum, chemical, railway transportation, metallurgy, shipbuilding, military industry and other industrial sectors; the current process of making gratings mainly uses DRIE technology, LIGA technology and silicon-based photo-assisted electrochemical etching technology.

DRIE is an anisotropic dry etching technology, which is based on inductively coupled plasma for deep processing of silicon or other materials; firstly, the mask is covered on the substrate to be etched, and an appropriate gas is filled for etching. However, lateral corrosion will follow in this process, so after a certain depth of etching, a layer of polymer is deposited on the etched surface to form a sidewall protective film. The protective film needs to be worn off before the silicon can continue to be etched. . During the production process, the X light source requires an expensive accelerator, which is costly, and the mask used for X-ray lithography is itself a 3D microstructure, which is complicated to produce and has a long period.

LIGA processing technology is one of the traditional manufacturing methods of absorption grating 7 and is often used to produce gratings with large aspect ratio structures. The principle of LIGA technology is to combine lithography (Lithographie), electroforming (Galvanoformung) and injection molding (Abformung). These three are combined. However, in the process of research, it is found that when the grating 7 is made by this method, the grating 7 often breaks and collapses and causes structural failure. Moreover, the production cost is relatively high, and the production area is small.

The photo-assisted electrochemical etching method has a complicated process, and the silicon-based resistivity, temperature, etching solution, etc. all have a greater impact on the etching structure during the production process, which is difficult to control. In the later high atomic number metal filling process, The required filling process is complicated and the conditions are relatively harsh.

technical problem

In view of the shortcomings in the above-mentioned technology, the present invention provides a manufacturing process for grating 7 with light metal film 1 adhered to heavy metal colloid. The light metal film 1 to which heavy metal colloid solution is attached is directly stacked with the light metal film 1 to which heavy metal colloid solution is not attached. A composite film stack of light and heavy metals is formed, and finally cut and packaged to obtain the grating 7; the entire process grating 7 has a short production cycle, low cost, and a convenient and quick production process.

Technical solutions

In order to achieve the above objective, the present invention provides a manufacturing process for grating 7 with light metal film 1 adhering heavy metal colloid, including

Preparation of heavy metal colloid solution: adding a dispersant and a reducing agent to the heavy metal salt solution in order to obtain a heavy metal colloid solution;

Add adhesive: add adhesive to the prepared heavy metal colloid solution to obtain a viscous heavy metal colloid solution;

Making the viscous light metal film 1: transfer the light metal film 1 to the viscous heavy metal colloid solution, so that the heavy metal particles adhere to the light element metal plate, and then transfer the light metal film 1 out to obtain the viscous light metal film 1;

Making a composite film stack: stack the light metal film 1 and the viscous light metal film 1 on each other to obtain a composite film stack;

Cutting: The composite film stack is cut according to the set size to obtain the quasi-grating 5;

Packaging: The quasi-grating 5 is packaged with a weak X-ray absorbing material to obtain the grating 7.

Among them, when preparing the heavy metal colloidal solution, first add concentrated ammonia water to the heavy metal salt solution to obtain the metal ammonia complex solution, then add the dispersant to the metal ammonia complex solution, and after stirring uniformly, add the reducing agent dropwise, After being evenly stirred, a nano-scale heavy metal colloid is obtained.

Wherein, when preparing the heavy metal colloidal solution, the molar ratio of the heavy metal salt to the dispersant is 11:1-12:1.

Wherein, when preparing the dropping reducing agent, the molar ratio of the heavy metal salt to the reducing agent is 1:3-1:5.

Among them, when the adhesive is added, the adhesive is a heat-volatile adhesive.

Wherein, when the viscous light metal film 1 is made, the heavy metal layer 2 is adhered to both sides of the light metal film 1; the thickness of the heavy metal layer 2 is controlled by controlling the concentration of the heavy metal colloid solution.

Wherein, when the viscous light metal film 1 is made, it is necessary to heat the light metal film 1 with the heavy metal layer 2 adhered on both sides to volatilize the binder liquid and solidify the heavy metal particles on the surface of the light element metal.

Wherein, when making the composite film laminate, the adhesive light metal film 1 and the light metal film 1 are folded alternately or directly rolled up to form a composite film stack in which the light metal film 1 and the heavy metal layer 2 are stacked at intervals.

Wherein, the edge of the composite membrane stack is first cut to obtain the composite membrane stack of the first shape, and then the composite membrane stack of the first shape is cut according to the set size to obtain the quasi grating 5.

Wherein, the cut surface of the quasi-grating 5 is clamped by the carbon fiber 6 material plate until the carbon fiber 6 adheres to the composite films to complete the packaging.

Beneficial effect

The beneficial effects of the present invention are: the process of the present invention includes: preparing a heavy metal colloid solution, adding an adhesive, adhering to the heavy metal colloid solution, making a composite film laminate, cutting and encapsulating; five major steps, firstly preparing a heavy metal colloid by heavy metal salt , And then add a heating and volatile adhesive to the heavy metal colloid to increase the viscosity of the heavy metal colloid, and then pass the light metal film through the viscous heavy metal colloid to obtain two adhesive light metal films that adhere to the heavy metal layer, and then combine the light metal film and the adhesive The flexible light metal film is folded alternately to obtain a composite film stack, and finally the composite film stack is cut and encapsulated to obtain a grating 7. The whole production process of the present invention is short, the cost price is low, and the production process is convenient and quick. The fabricated structure will not collapse. By controlling the width of the light element metal sheet, it can be used to fabricate gratings of any area. Through one fabrication, X-ray gratings can be mass-produced.

Description of the drawings

Figure 1 is a process flow diagram of the present invention;

Figure 2 is a schematic diagram of the directly purchased metal film drum structure;

3 is a schematic diagram of the light metal film of the present invention obtained by physical rolling technology to obtain a predetermined thickness;

4 is a schematic diagram of the light metal film of the present invention forming a viscous light metal film 1;

5 is a schematic diagram of the first step of stacking the adhesive light metal film and the light metal module of the present invention;

6 is a schematic diagram of the second step of stacking the adhesive light metal film and the light metal module of the present invention;

7 is a schematic diagram of the third step of stacking the adhesive light metal film and the light metal module of the present invention;

FIG. 8 is a schematic diagram of the sticky light metal film block and the light metal module stack of the present invention;

FIG. 9 is a schematic view of the sticky light metal film and the light metal mold being vertically rolled and stacked according to the present invention;

FIG. 10 is a schematic diagram of the roll of the viscous light metal film of the present invention;

11 is a schematic diagram of the quasi-grating 5 obtained by cutting the first shape composite film stack 4 of the present invention;

FIG. 12 is a schematic diagram of the first-shaped composite membrane stack 4 according to the present invention;

Figure 13 is a schematic diagram of the quasi-grating structure of the present invention;

Fig. 14 is a schematic diagram of the grating structure of the present invention.

The main component symbols are explained as follows:

1. Light metal film; 2. Heavy metal layer; 11. Roller; 13. Connection part; 4. First shape composite film stack; 5. Quasi-grating; 6. Carbon fiber; 7. Grating.

Embodiments of the present invention

In order to express the present invention more clearly, the present invention will be further described below with reference to the accompanying drawings.

In the diffraction process, the light satisfies the formula (a+b)(sinφ+sinθ)=k λ; where a represents the slit width, b represents the slit spacing, φ is the diffraction angle, and θ is the incident direction of the light and the grating 7 The angle between the normals of the plane, k is the number of bright fringe spectrum (k=0, ±1, ±2...), λ is the wavelength, and a+b is called the grating 7 constant; the fringe produced by the grating 7 The characteristics are: bright stripes are very bright and narrow, the dark area between adjacent bright stripes is very wide, and the diffraction pattern is very clear; if the deviation of the slit width and the slit spacing is too large due to manufacturing errors, the image will be blurred during diffraction , The final image obtained by X-rays will be blurred and unclear; especially in medical applications, unclear images can easily lead to a very high error rate in disease inspection; therefore, how to accurately produce grating 7 in batches has become a market today. Prospect of technical points.

As mentioned in the background art, the current process for making grating 7 mainly includes DRIE technology, LIGA technology and silicon-based photo-assisted electrochemical etching technology; in the process of making grating 7 by DRIE technology, the X light source requires expensive accelerators, and the cost is high. The mask used for X-ray lithography is itself a 3D microstructure with a long production cycle; in the LIGA technology, when the grating 7 is produced, the grating 7 often breaks and collapses and causes structural failure. In addition, the production cost is relatively high, and the production area is small; the photo-assisted electrochemical etching method has a complicated process, and the silicon-based resistivity, temperature, and etching solution during the production process have a large impact on the etching structure, which is difficult to control. In the later high atomic number metal filling process, the required filling process is complicated and the conditions are relatively harsh; currently, there has not yet been a low cost, short cycle, convenient manufacturing process and suitable for mass production of the grating 7 manufacturing process.

Based on this, the present application provides a manufacturing process for grating 7 with light metal film 1 adhered to heavy metal colloid. Please refer to FIG. 1, which includes the following steps:

Prepare heavy metal colloidal solution: add dispersant and reducing agent to heavy metal salt solution in order to obtain dispersed colloidal solution;

Add adhesive: add adhesive to the prepared heavy metal colloid solution to obtain a viscous heavy metal colloid solution;

Adhesive heavy metal colloid solution: transfer the light metal film 1 to the viscous heavy metal colloid solution, so that the heavy metal particles adhere to the light element metal plate and then transfer the light metal film 1 out to obtain the adhesive light metal film 1;

Making a composite film stack: stack the light metal film 1 and the adhesive light metal film 1 on each other to obtain a composite film stack;

Cutting: The composite film stack is cut according to the set size to obtain the quasi-grating 5;

Packaging: The quasi-grating 5 is packaged with a weak X-ray absorbing material to obtain the grating 7.

In this process, there are five steps including preparation of heavy metal colloid solution, addition of adhesive, adhesion of heavy metal colloid solution, production of composite film lamination, cutting and packaging. The entire production cycle of the grating 7 of the present invention is short and the cost is low. The production process is convenient and quick; the produced structure will not collapse. By controlling the width of the light element metal sheet, it can be used to produce gratings 7 of any area. Through one production, X-ray gratings 7 can be mass-produced.

Please refer to Figure 2. When preparing the heavy metal colloidal solution, first add concentrated ammonia to the heavy metal salt solution to obtain the heavy metal ammonia complex solution, and then add the dispersant to the heavy metal ammonia complex solution, and stir evenly, then add dropwise Reducing agent, after stirring evenly, a nano-scale heavy metal colloid is obtained.

In this embodiment, the heavy metals can be metals with large atomic numbers such as tungsten, silver, lead, gold; the corresponding heavy metal salt solutions include lead acetate solution, nitrate solution, gold trichloride solution, etc.; the solution can be purchased directly from the market The corresponding powder can be obtained by directly dissolving in water; after obtaining the metal salt solution, first add concentrated ammonia water to the metal salt solution to obtain a metal ammonia complex solution; wherein the concentration of ammonium ions in the concentrated ammonia water is greater than 15%; dispersant Including alkali metal phosphates, such as: sodium tripolyphosphate, sodium hexametaphosphate and sodium pyrophosphate, lauric acid, triethylhexyl phosphoric acid, sodium lauryl sulfate, methylpentanol, cellulose derivatives, poly Acrylamide, Guer gum, fatty acid polyethylene glycol ester, etc.; dissolve the complex after adding dispersant; after the complex is dissolved, add a reducing agent to reduce to obtain heavy metal colloids; common reducing agents include hydrogen sulfide and potassium iodide , Metal element, hydrogen, carbon monoxide gas, sodium borohydride, etc.; after stirring evenly, the reaction result can be tested by the Tyndall effect. In this embodiment, after the stirring is uniform, the ultrasonic instrument can be used to uniformly disperse the nano-scale heavy metal particles in the colloidal solution.

In this embodiment, when preparing the heavy metal colloidal solution, the molar ratio of the heavy metal salt to the dispersant is 11:1-12:1, preferably 11.6:1.

In this embodiment, when preparing the dropping reducing agent, the molar ratio of the heavy metal salt to the reducing agent is 3:1-5:1; preferably 4:1.

Example 1:

Dissolve 30g of silver nitrate in 150mL of distilled water and 30mL of concentrated ammonia to prepare a silver ammonia complex solution; then dissolve 7.5g of lauric acid in 1000mL of distilled water and 75mL of concentrated ammonia to prepare an aqueous solution of lauric acid; turn on electric stirring The device mixes the silver ammonia solution and the lauric acid aqueous solution uniformly, and controls the stirring speed at 800-1000 r/min. At room temperature, add dropwise to the above mixed solution NaBH4 solution, the molar ratio of reducing agent NaBH4 to silver nitrate is [AgNO3] /[NaBH4] = 4. After the addition is complete, stir for 1 h to obtain black nano silver colloid; when a large amount of nano silver colloid needs to be prepared , You can increase the amount of reagents in equal proportions.

In this embodiment, when the adhesive is added, the adhesive is a heat-volatile adhesive; the adhesive includes bisphenol A type, novolac type, novolac epoxy resin, polyurethane adhesive, etc.; preferably Adopt: ethyl acrylate as adhesive.

Referring to FIG. 4, when the viscous light metal film 1 is made, the heavy metal layer 2 is adhered to both sides of the light metal film 1; the thickness of the heavy metal layer 2 is controlled by controlling the particle concentration of the heavy metal colloid.

In this embodiment, the light metal material is a metal with a small atomic number such as aluminum or beryllium; usually the prefabricated light metal film 1 has a thickness of 50-80 microns; a width of about 5-10 cm; it is wound on a roller like a roll of paper Above; the light metal film 1 is made through a drawing and pressing process, and there are finished products on the market for direct sale; the light metal film 1 is prefabricated, and the production of the light metal film 1 is separated from the production of the grating 7 to provide an independent environment for each process , It is more conducive to mass production of the assembly line; and the size of the light metal film 1 can be preset to better control the accuracy, so that the error in the production of the grating 7 is smaller.

In this embodiment, the light metal film 1 is pulled out of the roller before being transferred to the heavy metal colloid solution, and after being pulled out, it is transported through the rolling equipment, and the rolling equipment rolls the thickness of the light metal film 1 to the set value. ; For example, the setting value is 30 microns, and the thickness of the light metal film 1 is rolled from 60 microns to 30 microns. After the light metal film 1 is rolled, it continues to be transported to the heavy metal colloid pool, and then is transported out after passing through the colloid pool. The light metal film 1 has heavy metal particle layers adhered on both sides to form an adhesive light metal film 1. The thickness of the heavy metal layer 2 is determined by the particle solubility of the colloid; for example, the solubility of the heavy metal colloid is 15.2g/L, and the light metal film 1 The time to pass through the heavy metal colloid is 1 min, and the heavy metal layer 2 with a thickness of 25 microns is formed on both sides of the light metal film 1.

In this embodiment, the light metal film 1 is drawn from the roller, rolled, and then transferred to the viscous heavy metal colloid solution and passed out. In the whole process, the light metal film 1 can be a long strip that has not been broken, or it can be First pull off the light metal film 1 from the drum, and then pass through the rolling equipment and viscous heavy metal colloid in sequence; for example, after the light metal film 1 is pulled from the drum, it is cut into a piece of light metal film with a length of 10 cm, a width of 5 cm and a thickness of 60 microns. Then pass the roller 11, and follow-up processing in turn.

In this embodiment, the viscous light metal film 1 can also be obtained by directly spraying heavy metal colloid on the light metal film 1. The light metal is first pulled out of the roller and then passed through a rolling device, which rolls the thickness of the light metal film 1 Press to the set value; then directly spray heavy metal colloid on both sides of the light metal film 1.

In this embodiment, after the heavy metal colloidal solution is adhered, the adhesive light metal film 1 needs to be heated to volatilize the adhesive liquid, and the heavy metal particles are solidified on the light element metal surface to finally obtain the adhesive light metal film 1. The thickness of the heavy metal layer 2 does not change during the volatilization of the adhesive liquid; after being transferred from the viscous heavy metal colloid, the adhesive liquid is volatilized by a constant temperature heating device, and the heavy element metal particles are solidified on the light element metal surface at a constant temperature. The temperature and heating time are different depending on the type of adhesive added; for example: the adhesive is ethyl acrylate as the adhesive, the heating time is 10min, the heating temperature is 80 degrees, the adhesive liquid is completely volatilized, heating The thickness of the front heavy metal layer 2 is 25 microns, and the thickness of the heavy metal layer 2 is still 25 microns after heating.

Please refer to Figure 5, when the composite film laminate is made, the light metal film 1 and the viscous light metal film 1 are folded alternately to form a composite film stack in which the light metal film 1 and the heavy metal layer 2 are stacked at intervals. The thickness D of the single light metal film 1 and the heavy metal film on its surface The sum of the layer thickness d is the period n of the grating 7.

Example 2:

The viscous light metal film 1 is a long strip that has not been broken. The light metal film 1 is pre-cut into a light metal film of a predetermined shape and size, such as a light metal module with a length of 10 cm, a width of 6 cm, and a thickness of 30 microns; The width of the light metal is 6cm, the thickness is 30 microns, and the thickness of the heavy metal layer 2 on the viscous light metal is 50 microns; with the light metal film 1 as the bottom layer, a layer of viscous light metal film 1 is covered on the light metal film 1, and then on the viscous light metal film 1. Stack the light metal film 1, alternately stacked to form a conforming film stack, the grating 7 period is 80 microns; among them, the alternate stacking adopts the zigzag stacking method, which has high stacking efficiency; the two opposite sides of the composite film stack will be curled due to the viscous metal film The resulting connection portion 13.

Example 3:

Both the light metal film 1 and the viscous light metal film 1 are pulled into pieces of metal film of a set size, and one piece of light metal film is cut into a piece of light metal film of a set shape and size after passing through the rolling equipment, for example, cut into a length of 10cm , A viscous light metal module with a width of 6cm and a thickness of 30 microns. The thickness of the heavy metal layer 2 on the viscous light metal is 50 microns; the size of the light metal film 1 is exactly the same as the size of the viscous light metal; the light metal film 1 is directly connected to the viscous metal module. Interleaved stacked to form a composite film stack; the grating 7 has a period of 80 microns.

Example 4:

The light metal film 1 and the viscous light metal film 1 are both long and unbroken. When the composite film is made, the size of the light metal and the viscous light metal are both 6cm in width and 30 microns in thickness, and the thickness of the heavy metal layer 2 is 50 microns; 1. Place the adhesive metal film in the first direction, place the adhesive metal film in the second direction, the first direction and the second direction are perpendicular to each other; interfold the light metal film 1 and the adhesive light metal film 1 to form a composite film stack with a length and a width of 6 cm; The 7 period is 80 micrometers; and the adjacent surface of the grating 7 will have a connection portion 13 due to the bending of the viscous metal film and the light metal film 1.

Please refer to Figure 6, when making a composite film laminate, you can directly roll the viscous light metal film 1 to form a composite film stack in which the light metal film 1 and the heavy metal layer 2 are stacked at intervals. The thickness of the viscous light metal film 1 is D, and the thickness of the heavy metal layer 2 is d, the grating 7 period n=D+2*n.

Example 5:

The viscous light metal film 1 is a long strip that is not broken. When making a composite film laminate, the size of the viscous light metal film 1 is 6cm in width, 30 microns in thickness, and the heavy metal layer 2 is 50 microns in thickness; Set the length and fold back and forth to obtain a composite membrane stack with light metal film 1 and heavy metal layer 2 staggered. The period of the grating 7 in the composite membrane stack is 130 microns; The connecting portion 13 produced by the bending of the film 1.

Please refer to Figure 7, after obtaining the composite membrane stack, cut the conforming membrane stack; when cutting the composite membrane stack, first cut the edge of the composite membrane stack to obtain the composite membrane stack of the first shape, and then cut the first shape according to the set size The composite film stack is used to obtain the quasi-grating 5; since the composite film stack has the connecting part 13 or the metal film cannot be completely aligned with the edge during the process of making the composite film, it is necessary to cut off the edge that conforms to the film first. Keep the completely overlapped middle part, where the cut position is where the edge of the composite membrane stack is greater than 1cm; the composite membrane stack after removal is preferably a rectangular parallelepiped; laser resection or wire cutting machine or milling cutter is used for resection; preferably High-power laser cutting, the precision can reach 0.01mm during cutting.

In this embodiment, the first shape may be a polygon, a rectangle, a triangle or other shapes; the preferred first shape is a rectangle.

Referring to Figures 8-14, after obtaining the composite film stack 4 of the first shape, the first shape is cut along the width direction of the composite film stack to obtain a plurality of quasi gratings 5, and the thickness direction of the first shape is the width of the quasi grating 5 , The width direction of the first shape is the length direction of the quasi grating 5; the cutting pitch is the thickness direction of the quasi grating 5; the length of the grating 7 obtained after cutting is the same; the thickness direction of the grating 7 does not need to be cut during the entire cutting process, And only the number of cuts is small, and the production precision is high.

In this embodiment, when cutting the first shape, the cutting direction and angle can be adjusted arbitrarily, and after cutting, it is not limited to vertical cutting.

Please refer to FIG. 9, in the packaging process, the carbon fiber 6 material film is used to clamp the cut surface in the width direction of the first shape until the carbon fiber 6 adheres to the composite film of each layer to complete the packaging, and the grating 7 is obtained.

To

Industrial applicability

The advantages of the present invention are:

1. The light metal film 1 can be compressed to a predetermined thickness D by physical rolling technology, and then the light metal film 1 can be passed through a heavy metal colloid to obtain a viscous light metal film 1 of a set size;

2. The production cycle of the grating 7 produced by the present invention is short, the cost is low, and the production process is convenient and quick; the produced structure will not collapse, and the grating 7 of any area can be produced by controlling the width of the light element metal plate. Through one production, X-ray grating 7 can be produced in large quantities.

To 3. Before the light metal film 1 is made into a composite film stack, normal processing may not be performed, and the composite film stack can be stacked to form a composite film stack and then cut.

Sequence Listing Free Content

The above disclosures are only a few specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be thought of by those skilled in the art should fall into the protection scope of the present invention.

Claims (10)

1. A grating manufacturing process with light metal film adhered to heavy metal colloid, which is characterized in that it comprises

   Preparation of heavy metal colloid solution: adding dispersant and reducing agent to heavy metal salt solution in order to obtain heavy metal colloid solution;

   Add adhesive: add adhesive to the prepared heavy metal colloid solution to obtain a viscous heavy metal colloid solution;

   Making a viscous light metal film: transfer the light metal film to a viscous heavy metal colloid solution, so that the heavy metal particles adhere to the light element metal plate, and then the light metal film is transported out to obtain a viscous light metal film;

   Making a composite film stack: stack the light metal film and the viscous light metal film with each other to obtain a composite film stack;

   Cutting: The composite film stack is cut according to the set size to obtain the quasi-grating;

   Packaging: Use the X-ray weak absorption material to package the quasi-grating to obtain the grating.
2. The grating manufacturing process of light metal film adhering heavy metal colloid according to claim 1, wherein when preparing the heavy metal colloid solution, first add concentrated ammonia water to the heavy metal salt solution to obtain the metal ammonia complex solution, and then add the metal ammonia complex solution to the heavy metal salt solution. Add a dispersant to the compound solution and stir it evenly, then add the reducing agent drop by drop, and stir evenly to obtain a nano-scale heavy metal colloid.
3. The grating manufacturing process of light metal film adhered to heavy metal colloid according to claim 2, characterized in that, when preparing the heavy metal colloid solution, the molar ratio of the heavy metal salt to the dispersant is 11:1-12:1.
4. The grating manufacturing process for light metal film adhered to heavy metal colloid according to claim 2, characterized in that when preparing the dropwise reducing agent, the molar ratio of the heavy metal salt to the reducing agent is 3:1-5:1.
5. The grating manufacturing process of light metal film adhering heavy metal colloid according to claim 1, characterized in that when the adhesive is added, the adhesive is a heated and volatile adhesive.
6. The grating manufacturing process for light metal film adhered to heavy metal colloid according to claim 1, characterized in that when the viscous light metal film is made, the heavy metal layer is adhered to both sides of the light metal film; the thickness of the heavy metal layer is controlled by controlling the concentration of the heavy metal colloid solution.
7. The grating manufacturing process with light metal film adhered to heavy metal colloid according to claim 6, characterized in that, when making the viscous light metal film, it is necessary to heat the light metal film with the heavy metal layer adhered on both sides to make the adhesive liquid volatilize , The heavy metal particles are solidified on the surface of the light element metal.
8. The grating manufacturing process of light metal film adhered to heavy metal colloid according to claim 1, characterized in that, when making the composite film laminate, the viscous light metal film and the light metal film are alternately folded or the viscous light metal film is directly rolled to form the light metal film and A composite membrane stack in which heavy metal layers are stacked at intervals.
9. The grating manufacturing process of light metal film adhering heavy metal colloid according to claim 1, wherein when cutting the composite film stack, the edge of the composite film stack is first cut to obtain the composite film stack of the first shape, and then the composite film stack is cut according to the set size. The composite membrane stack of the first shape obtains the quasi-grating.
10. The grating manufacturing process of light metal film adhering heavy metal colloid according to claim 1, characterized in that, in the packaging process, the cut surface of the quasi grating is clamped by the carbon fiber material plate until the carbon fiber is bonded to each composite film. Complete the package.