CN104190905A - Mold suitable for manufacturing large-size blocky amorphous alloy and amorphous alloy composite material - Google Patents

Abstract

The invention relates to a mold suitable for manufacturing large-size blocky amorphous alloy and an amorphous alloy composite material. The mold comprises an internal mold made of red copper and further comprises an external mold made of stainless steel, wherein the external mold is provided with an upper opening. The internal mold is of a split type and is clamped in the external mold, and a gap is formed between the bottom of the internal mold and the external mold. A cavity between the internal mold and the external mold is filled with gallium and indium alloy. The inner side of the external mold is vertically provided with positioning clamping grooves. Convex strips on the internal mold are clamped in the positioning clamping grooves. The internal mold is divided into two symmetrical parts. A sealing groove is machined in a parting surface and used for arranging a sealing strip. The two symmetrical parts are connected through fastening bolts. The whole mold is composed of a cooling part and a forming part, repeated machining of the cooling part is avoided, and mold materials are greatly saved; besides, the mold is reasonable in structure, simple, convenient to operate and especially suitable for machining the large-size blocky amorphous alloy.

Description

Molds suitable for preparing bulk bulk amorphous alloys and their composite materials

technical field

The invention belongs to the field of preparation of block amorphous alloy and composite material thereof. In particular, it is a mold suitable for preparing large-volume bulk amorphous alloys and their composite materials.

Background technique

Amorphous alloys have special properties due to their unique internal structure and have broad application prospects. In recent years, amorphous alloys have been a research hotspot in the fields of material science, condensed matter physics and mechanics. When amorphous alloys are formed, a high cooling rate is required to inhibit the nucleation and growth of crystals. Therefore, only small-sized amorphous samples can be obtained. This problem severely limits the wide application of amorphous alloys. The preparation of large-volume bulk amorphous alloys of different shapes and sizes is a key technology that scholars from all over the world have been working on.

In recent years, the copper mold casting method has been the main method used to prepare bulk amorphous, including suction casting method, spray casting method, casting method, etc. The common point is that the molten liquid metal is quickly injected into a mold with a certain shape of the cavity. In the copper mold, through the heat dissipation capability of the copper mold, the alloy liquid is rapidly cooled to obtain bulk amorphous. This kind of copper mold is generally made of pure copper. It is generally two solid copper blocks that are split left and right. After the mold is closed, a cavity is formed. In order to ensure sufficient cooling capacity, the volume of the copper mold must be large enough. For example, the commonly used suction casting copper mold has an outer diameter of 100mm, a height of 100~120mm, and a weight of about 7.5kg.

When the copper mold used above is used, there are two outstanding problems: one is that the copper mold is an integral part with a fixed-sized inner cavity, and can only be used to prepare a fixed-shaped bulk amorphous. To prepare bulk amorphous with different shapes, different copper molds must be processed, and the copper mold itself uses a lot of materials, so the manufacturing cost is high; the second is to prepare bulk amorphous (such as 10000mm ³ or larger) When crystallizing, the volume of the required copper mold also increases correspondingly, the weight increases, and it is inconvenient to operate. Aiming at the second problem, on the basis of the above-mentioned copper mold, people cool the copper mold with water, that is, the water-cooled copper mold. The water-cooled copper mold can provide stronger cooling capacity, but it makes the processing technology of the mold more complicated. At the same time, it is required to introduce cooling water into the vacuum chamber of the electric arc furnace or induction furnace, which is inconvenient to use. Moreover, the water-cooled copper mold still has the above-mentioned first problem.

Contents of the invention

The present invention provides a mold suitable for the preparation of bulk amorphous alloys and their composite materials, so as to achieve the purpose of controllable cooling capacity, easy preparation of different shapes, convenient use, simple processing technology, and reduced preparation cost.

In order to achieve the above object, the present invention provides a mold suitable for preparing large-volume bulk amorphous alloys and composite materials thereof, which includes a copper inner mold, and is characterized in that: it also includes a stainless steel outer mold with an upper opening. The mold is a split type, the inner film is clamped in the outer mold and there is a distance between the bottom of the inner mold and the outer mold, and the cavity between the inner mold and the outer mold is filled with gallium indium alloy.

A positioning slot is vertically arranged on the inner side of the outer mold, and the convex strip on the inner mold is set in the positioning slot.

The inner mold is divided into two symmetrical parts, the parting surface is processed with a sealing groove for placing the sealing strip, and the two symmetrical parts are connected by fastening bolts. When the mold is in use, first place the sealing rubber strip in the sealing groove, and fasten the two symmetrical parts with fastening bolts.

Compared with prior art, the advantage of the present invention is:

1. The invention decomposes the two-phase function of cooling and forming of the traditional copper mold into two independent parts, and the whole set of mold is composed of two parts of cooling and forming, which avoids repeated processing of the cooling part. In the present invention, the outer mold and the cooling medium provide the cooling capacity required for the preparation of the amorphous alloy, and the copper inner mold used only has a forming function, as long as a suitable inner cavity can be provided, it is no longer the main body that provides the cooling capacity, so any The shape is acceptable, as long as there is a convex line that can be fixed with the outer mold, so the volume and weight of the copper inner mold are small, and when preparing a large-volume (such as about 10000mm ³ ) bulk amorphous, it is only about 400g. Great saving of mold material.

2. If the mold is used to prepare bulk amorphous bodies of different shapes and sizes, it can be realized only by replacing the inner mold made of pure copper (copper), and the inner mold provided by the present invention is low in cost, and can be used in multiple shapes and sizes. , and its cost advantage is higher.

3. Part of the cooling function is a one-time investment. The stainless steel outer mold has a simple shape, is easy to process, and can be reused many times; the gallium-indium alloy is also a one-time investment and can be used repeatedly for a long time. The cooling capacity of the mold can be adjusted, which is suitable for the preparation of bulk amorphous alloys of various shapes. the

4. When preparing bulk amorphous crystals of different shapes and sizes, only the lower-cost inner mold needs to be replaced, and the cooling function part is invested at one time, and the outer mold and cooling medium do not need to be replaced. When preparing large-volume amorphous alloys, it is only necessary to change the cavity of the inner mold and add more cooling medium to the outer mold.

5. The structure is reasonable, simple and easy to operate. The invention adopts the fixing method that the inner mold is inserted into the outer mold, so that the use of the whole set of molds is extremely convenient, and at the same time, the inner mold is a split mechanism, which is convenient for demoulding and improves work efficiency.

6. Wide range of applications: especially suitable for processing large volume bulk amorphous.

Description of drawings

Figure 1 is a schematic diagram of the assembly of the entire mold;

Fig. 2 is a partial sectional view of a complete set of moulds;

3 is a schematic diagram of an internal mold for preparing rectangular flaky amorphous crystals;

Fig. 4 is the transverse sectional view of the inner mold of preparing rectangular flaky amorphous;

Fig. 5 is the longitudinal sectional view of the internal mold of preparing rectangular flaky amorphous;

Fig. 6 is a schematic diagram of an internal mold for preparing circular flake amorphous;

Fig. 7 is the transverse sectional view of the internal mold of preparing circular flaky amorphous;

Fig. 8 is the longitudinal sectional view of the internal mold of preparing circular flaky amorphous;

Fig. 9 is a schematic diagram of an internal mold for preparing cylindrical amorphous;

Fig. 10 is the transverse cross-sectional view of the internal mold that prepares cylindrical amorphous;

Fig. 11 is the longitudinal sectional view of the internal mold of preparing cylindrical amorphous;

Fig. 12 is the bulk amorphous sample prepared in embodiment 1;

FIG. 13 is the XRD pattern of the bulk amorphous prepared in Example 1.

In the figure, 1-outer mold, 2-gallium indium alloy, 3-inner mold, 4-sealing strip, 5-fastening bolt, 6-positioning slot.

Detailed ways

Referring to Fig. 1, a mold suitable for preparing bulk amorphous alloys and composite materials thereof includes a copper inner mold 3 and a stainless steel outer mold 1 with an upper opening. The inner mold 3 is split and divided into symmetrical The two parts, the parting surface is processed with a sealing groove for placing the sealing strip 4, and the symmetrical two parts are connected by fastening bolts 5. The inner side of the outer mold 1 is vertically provided with a positioning slot 6, the convex strip on the inner mold 3 is set in the positioning slot 6 on the outer mold 1, and the cavity between the inner mold 3 and the outer mold 1 is filled with Gallium-indium alloy 2, there is a distance between the bottom of the inner mold 3 and the outer mold 1, so that the space at the bottom can make the gallium-indium alloy 2 into a whole, ensuring uniform heat dissipation of the copper mold.

The design of the present invention is based on the preparation of CuZr-based amorphous with a maximum volume of 15,000mm ³ as a reference. In order to ensure the stability of the structure of the amorphous alloy, it is required that the temperature of the gallium-indium alloy 2 itself not exceed 50°C during the cooling process. Cooling the liquid Cu ₅₀ Zr ₅₀ alloy of 15000mm ³ (114g in weight, usually 15~25g for suction casting) and 1300℃ to room temperature will release 48692.25J of heat, assuming that all the heat of the liquid alloy is transferred to gallium Indium alloy 2 requires 6.19kg (970ml) of gallium indium alloy 2, which can ensure that the temperature of the mold does not exceed 50°C. At the same time, the time is measured, and the cooling rate of the mold reaches 5.2×10 ² K/s, which can meet the requirement of the cooling rate for the preparation of the amorphous alloy.

The method of assembling the mold is: when the mold is in use, first place the sealing strip 4 in the positioning slot 6 of the inner mold 3, and after fastening the two halves of the inner mold 3 with fastening bolts 5, place the copper inner mold 3 Insert the positioning card slot 6 of the stainless steel outer mold 1 to fix it, and finally fill the outer mold 1 with gallium-indium alloy 2. Place the entire set of molds on the lower part of the melting crucible, and adjust the proper casting position. The raw materials are quickly sprayed or poured into the inner mold 3 after arc melting or induction melting.

Example 1: Casting 10000mm ³ CuZrAlY amorphous plate by arc melting method

1) 100g of Zr with a purity of 99.8%, and Cu, Al, and Y with a purity of 99.99% according to the nominal composition of Cu ₄₅ Zr ₄₅ Al ₈ Y ₂ are placed in an electric arc furnace;

2) Vacuum the electric arc furnace until the vacuum degree reaches 5×10 ^-3 Pa, then fill it with argon gas to 0.8 atmospheric pressure, first melt Ti to absorb oxygen, and then melt the raw materials for 3 to 5 times to ensure uniform composition and obtain buttons master alloy ingot.

3) Referring to Figure 3, Figure 4, and Figure 5, select the inner mold 3 with a cavity size of 50×50×4mm ³ to prepare rectangular sheet amorphous, and place the sealing strip 4 in the positioning slot 6 of the inner mold 3, After fastening the two halves of the inner mold 3 with fastening bolts 5, insert the copper inner mold 3 into the positioning slot 6 of the stainless steel outer mold 1 to fix it, and finally fill the outer mold 1 with 4.5 kg of gallium-indium alloy 2. Put the assembled mold into the vacuum chamber and adjust the proper position to ensure that the alloy liquid can be poured into the mold smoothly.

4) Put the master alloy into the casting crucible, start the arc to melt the master alloy again, and after 1 minute of melting, turn off the arc instantly, quickly tilt the crucible, and pour the liquid alloy into the mold.

5) After cooling for several minutes, open the vacuum chamber, take out the mold, unscrew the fastening bolt 5, separate the copper inner mold 3, and take out the amorphous alloy sample.

Referring to Fig. 12 and Fig. 13, the obtained sample was tested by XRD, and no crystal phase was found in each part, and the sample had a completely amorphous structure.

Example 2: Casting 7000mm ³ CuZrTi amorphous composite wafers by induction melting

1) Distribute 50g of Zr with a purity of 99.8%, Cu and Ti with a purity of 99.99% according to the nominal composition of Cu ₆₀ Zr ₃₀ Ti ₁₀ , and put them into a magnesia crucible with an inner diameter of 60mm and a depth of 80mm;

2) Referring to Figure 6, Figure 7, and Figure 8, select an inner mold with a cavity size of Φ60mm and a thickness of 2.5mm to prepare circular flake amorphous, place the sealing strip 4 in the positioning slot 6 of the inner mold 3, and use After fastening the two halves of the inner mold 3 with fastening bolts 5, insert the copper inner mold 3 into the positioning slot 6 of the stainless steel outer mold 1 to fix it, and finally fill the outer mold 1 with 3.5 kg of gallium-indium alloy 2. Put the assembled mold into the vacuum chamber and adjust the proper position to ensure that the alloy liquid can be poured into the mold smoothly.

3) Vacuum the induction furnace. After the vacuum reaches 5×10 ^-3 Pa, fill it with argon to 0.8 atmospheric pressure. Start the high-frequency power supply to melt the raw materials. After the alloy is completely melted, keep it warm for 2 minutes to make the composition uniform.

4) Tilt the crucible and pour the molten alloy liquid into the mold cavity.

5) After cooling for several minutes, open the vacuum chamber, take out the mold, unscrew the fastening bolt 5, separate the copper inner mold 3, and take out the amorphous alloy sample.

The obtained sample is detected by XRD and is a composite material in which crystal phase and amorphous phase coexist.

Embodiment 3 : Induction Heating Spray Casting 4000mm ³ CuZrAlY Amorphous Rod

1) Divide 30g of Zr with a purity of 99.8%, Cu, Al, and Y with a purity of 99.99% according to the nominal composition of Cu ₄₁ Zr ₄₉ Al ₈ Y ₂ ; arc melting for 3 to 5 times to ensure uniform composition, and mechanical crushing before loading Insert the quartz tube with a nozzle at the bottom, and then install the quartz tube into the vacuum induction melting furnace.

2) Referring to Figure 9, Figure 10, and Figure 11, select the inner mold 3 with a cavity size of Φ10 mm and a length of 60 mm to prepare cylindrical amorphous, place the sealing strip 4 in the positioning slot 6 of the inner mold 3, and use a tight After fastening the two halves of the inner mold 3 by the fastening bolt 5, insert the copper inner mold 3 into the positioning slot 6 of the stainless steel outer mold 1 to fix it, and finally fill the outer mold 1 with 2.5 kg of gallium-indium alloy 2. Put the assembled mold into the vacuum chamber and adjust the proper position to ensure that the nozzle of the quartz tube and the cavity of the mold are on the same vertical line.

3) Vacuum the induction furnace until the vacuum reaches 5×10 ^-3 Pa, then fill it with argon to 0.8 atmospheres, start the high-frequency power supply to melt the master alloy, and wait until the alloy is completely melted.

4) Open the argon gas valve and spray the liquid alloy into the mold.

5) After cooling for several minutes, open the vacuum chamber, take out the mold, unscrew the fastening bolt 5, separate the copper inner mold 3, and take out the amorphous alloy sample.

The obtained sample was detected by XRD, and no crystal phase was found on the cross section of the sample, which was a complete amorphous structure.

The content of the present invention is not limited to the examples listed, and any equivalent transformation of the technical solution of the present invention adopted by those of ordinary skill in the art by reading the description of the present invention is covered by the claims of the present invention.

Claims (3)

1. A mold suitable for preparing large-volume bulk amorphous alloys and composite materials thereof, comprising a copper inner mold (3), characterized in that it also includes a stainless steel outer mold (1) with an upper opening, the inner mold (3) is a split type, the inner membrane (3) is clamped in the outer mold (1) and there is a distance between the bottom of the inner mold (3) and the outer mold (1), the inner mold (3) and the outer mold ( 1) The cavity between them is filled with gallium indium alloy (2). 2. The mold suitable for preparing large-volume bulk amorphous alloys and their composite materials according to claim 1, characterized in that: a positioning slot (6) is vertically arranged on the inner side of the outer mold (1), and the inner mold ( 3) The convex strip on the top is set in the positioning slot (6). 3. The mold suitable for preparing large-volume bulk amorphous alloys and their composite materials according to claim 1 or 2, characterized in that: the inner mold (2) is divided into two symmetrical parts, and the parting surface is processed with Place the sealing groove of the sealing strip (4), and the two symmetrical parts are connected by fastening bolts (5).