阅读说明：本技术 强化多孔镁金属的制备工艺 (Preparation process of reinforced porous magnesium metal ) 是由 江国锋 李进 曹纯 房哲 曹辉 于 2020-03-31 设计创作，主要内容包括：本发明公开一种强化多孔镁金属的制备工艺,包括以下步骤：将第一镁金属块层、多孔钛块层和第二镁金属块层在固态条件下依次叠置形成物理堆叠,所述多孔钛块层的孔隙率为10%～90%；块状金属纤维层和第一固态块状铝合金层、第二固态块状铝合金层在300-650℃,3000N-20000N的压力条件下,通过摩擦热或者外部热源使得第一镁金属块层、多孔钛块层和第二镁金属块层注入多孔钛块层中,形成三明治结构的镁钛混合体；将三明治结构的镁钛混合体置于HF溶液中,选择性剔除金属钛。本发明形成轧制组织,较传统芯体结构强度提高30%～260%,可以精确控制芯体和夹层的体积,易于实现流水线生产。(The invention discloses a preparation process of reinforced porous magnesium metal, which comprises the following steps: sequentially superposing a first magnesium metal block layer, a porous titanium block layer and a second magnesium metal block layer under a solid condition to form a physical stack, wherein the porosity of the porous titanium block layer is 10-90%; under the conditions of 300-650 ℃ and 3000N-20000N pressure, the first magnesium metal block layer, the porous titanium block layer and the second magnesium metal block layer are injected into the porous titanium block layer by friction heat or an external heat source to form a magnesium-titanium mixture with a sandwich structure; and (3) placing the magnesium-titanium mixture with the sandwich structure into an HF solution, and selectively removing metallic titanium. The core body structure disclosed by the invention forms a rolling structure, the strength of the core body structure is improved by 30-260% compared with that of the traditional core body structure, the volume of the core body and the interlayer can be accurately controlled, and the production line production is easy to realize.)

1. A preparation process of reinforced porous magnesium metal is characterized by comprising the following steps: the method comprises the following steps:

the method comprises the following steps that firstly, a first magnesium metal block layer (1), a porous titanium block layer (2) and a second magnesium metal block layer (3) are sequentially overlapped under a solid condition to form a physical stack, and the porosity of the porous titanium block layer (2) is 10% -90%;

step two, injecting the first magnesium metal block layer (1), the porous titanium block layer (2) and the second magnesium metal block layer (3) into the porous titanium block layer (2) through frictional heat or an external heat source under the conditions that the massive metal fiber layer (2), the first solid massive aluminum alloy layer (1) and the second solid massive aluminum alloy layer (3) are at the temperature of 650 ℃ and the pressure of 3000N-20000N to form a magnesium-titanium mixture with a sandwich structure;

and step three, placing the magnesium-titanium mixture of the sandwich structure into an HF solution, selectively removing metallic titanium, and finally obtaining the porous magnesium metal body of the sandwich plate structure, wherein the porous magnesium metal body consists of a first magnesium interlayer (4), a second magnesium interlayer (6) and a porous magnesium core layer (5) positioned between the first magnesium interlayer (4) and the second magnesium interlayer (6).

2. The process of claim 1 for preparing a strengthened porous magnesium metal, wherein: the second step and the third step are realized by friction stir welding equipment, pressure is applied through a friction stir welding head, the rotating speed of the friction stir welding head is 200 r/min-5000 r/min, the feeding is 10 mm/min-5 m/min, the stirring frequency range is 4-40 times, and the rolling rate is 2% -98%.

3. The process of claim 2, wherein the magnesium alloy is prepared by a method comprising the steps of: the diameter range of a stirring pin of the stirring head is 1 mm-16 mm, and the length range is 1-16 mm; the diameter of the shaft shoulder is 2 mm-40 mm.

4. The process of claim 1 for preparing a strengthened porous magnesium metal, wherein: the second step and the third step are realized by adopting hot rolling equipment, the pressure applied by a rolling mill is 3000-10000N, the rolling temperature is 300-650 ℃, the rolling frequency is 4-40 times, and the rolling rate is 2% -98%.

5. The process of claim 1 for preparing a strengthened porous magnesium metal, wherein: the thickness range of the porous titanium block layer (2) is 0.1 mm-16 mm, the diameter range of titanium wires in the porous titanium block layer (2) is 0.05-5 mm, and the thicknesses of the first magnesium metal block layer (1) and the second magnesium metal block layer (3) are 0.1 mm-16 mm.

6. The process of claim 1 for preparing a strengthened porous magnesium metal, wherein: the soaking time in the third step is 1 min-24H, the mass concentration of the HF solution is 0.1% -90%, and the temperature of the HF solution is room temperature-100 ℃.

7. The process of claim 1 for preparing a strengthened porous magnesium metal, wherein: the bonding force between the porous magnesium core layer and the first magnesium interlayer and the bonding force between the porous magnesium core layer and the second magnesium interlayer are 1-400 MPa.

8. The process of claim 1 for preparing a strengthened porous magnesium metal, wherein: the strength range of the porous magnesium core layer (5) is 1 MPa-400 MPa.

9. The process of claim 1 for preparing a strengthened porous magnesium metal, wherein: the strength of the first magnesium interlayer (4) and the strength of the second magnesium interlayer (6) are 10MPa-600 MPa.

10. The process of claim 1 for preparing a strengthened porous magnesium metal, wherein: the first magnesium metal block layer (1) and the second magnesium metal block layer (3) are magnesium block layers or magnesium alloy block layers.

Technical Field

The invention relates to the technical field of new materials, in particular to a preparation process of reinforced porous magnesium metal.

Background

The sandwich plate structure is a light structure with multifunctional characteristics, has the characteristics of light weight, high rigidity, excellent shock resistance, heat dissipation and the like, has important application in a plurality of fields, is widely applied to the building and packaging industries, is particularly applied to shell structures of power machinery equipment such as automobiles, ships, high-speed trains, aerospace aircrafts and the like, and has important social and economic values. The traditional method for preparing the sandwich structure material comprises a direct foaming method, an assembly-connection method, a casting method and the like. Wherein 1) the direct foaming method has the defects of low bonding strength, uncontrollable structure and the like, 2) the casting method has the defects of a large number of holes, air holes and low strength, and 3) the assembling-connecting method has the defects of low bonding strength of an interlayer and a core layer and low production efficiency. The magnesium and the magnesium alloy have low density and high strength and receive more and more attention, and the sandwich porous magnesium with excellent performance has important practical value.

Disclosure of Invention

The invention aims to provide a preparation process of reinforced porous magnesium metal, which has the advantages of low cost, simple process, 50-300% improvement over the traditional assembly-connection method, formation of rolling tissue, 30-260% improvement over the traditional core body structure strength, no state change, no generation of defects such as pores and holes and the like, accurate control over the volumes of the core body and the interlayer and easy realization of flow line production.

In order to achieve the purpose, the invention adopts the technical scheme that: a preparation process of reinforced porous magnesium metal comprises the following steps:

the method comprises the following steps that firstly, a first magnesium metal block layer, a porous titanium block layer and a second magnesium metal block layer are sequentially overlapped under a solid condition to form a physical stack, and the porosity of the porous titanium block layer is 10% -90%;

step two, injecting the first magnesium metal block layer, the porous titanium block layer and the second magnesium metal block layer into the porous titanium block layer through frictional heat or an external heat source under the conditions that the massive metal fiber layer, the first solid massive aluminum alloy layer and the second solid massive aluminum alloy layer are at 650 ℃ and 3000N-20000N to form a magnesium-titanium mixture with a sandwich structure;

and step three, placing the magnesium-titanium mixture of the sandwich structure into an HF solution, and selectively removing metallic titanium to finally obtain a porous magnesium metal body of the sandwich plate structure, wherein the porous magnesium metal body consists of a first magnesium interlayer, a second magnesium interlayer and a porous magnesium core layer positioned between the first magnesium interlayer and the second magnesium interlayer.

The further improved scheme in the technical scheme is as follows:

1. in the scheme, the second step and the third step are realized by friction stir welding equipment, pressure is applied by a friction stir welding head, the rotating speed of the friction stir welding head is 200 r/min-5000 r/min, the feeding is 10 mm/min-5 m/min, the stirring frequency range is 4-40 times, and the rolling rate is 2% -98%.

2. In the scheme, the diameter range of the stirring pin of the stirring head is 1-16 mm, and the length range is 1-16 mm; the diameter of the shaft shoulder is 2 mm-40 mm.

3. In the scheme, the second step and the third step are realized by adopting hot rolling equipment, the pressure applied by a rolling mill is 3000-10000N, the rolling temperature is 300-650 ℃, the rolling frequency is 4-40 times, and the rolling rate is 2% -98%.

4. In the scheme, the thickness range of the porous titanium block layer is 0.1 mm-16 mm, the diameter range of titanium wires in the porous titanium block layer is 0.05-5 mm, and the thicknesses of the first magnesium metal block layer and the second magnesium metal block layer are 0.1 mm-16 mm.

5. In the scheme, the soaking time in the third step is 1 min-24H, the mass concentration of the HF solution is 0.1% -90%, and the temperature of the HF solution is room temperature-100 ℃.

6. In the scheme, the bonding force of the porous magnesium core layer, the first magnesium interlayer and the second magnesium interlayer is 1-400 MPa.

7. In the scheme, the strength range of the porous magnesium core layer is 1 MPa-400 MPa.

8. In the scheme, the strength of the first magnesium interlayer and the second magnesium interlayer is 10MPa-600 MPa.

9. In the above scheme, the first magnesium metal bulk layer and the second magnesium metal bulk layer are magnesium bulk layers or magnesium alloy bulk layers.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

the preparation process of the reinforced porous magnesium metal has the advantages of low cost and simple process, is improved by 50-300% compared with the traditional assembly-connection method, forms a rolling structure, is improved by 30-260% compared with the traditional core body structure strength, has no state change, does not generate defects such as air holes and holes, can accurately control the volumes of the core body and the interlayer, and is easy to realize flow line production.

Drawings

FIG. 1 is a schematic diagram of the preparation process of the present invention;

FIG. 2 (a) is a microscopic view of the bonding interface of titanium and magnesium in accordance with the present invention;

FIGS. 2 (b) and (c) are micrographs of composite interfaces of titanium wires and magnesium alloys with different diameters according to the invention;

FIG. 3 is a microscopic view of a cross section of the porous magnesium metal body of the present invention.

In the above drawings: 1. a first magnesium metal bulk layer; 2. a porous titanium bulk layer; 3. a second magnesium metal bulk layer; 4. a first magnesium interlayer; 5. a porous magnesium core layer; 6. a second magnesium interlayer.

Detailed Description

In the description of this patent, it is noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The meaning of the above terms in this patent may be specifically understood by those of ordinary skill in the art.

Example 1: a preparation process of reinforced porous magnesium metal comprises the following steps:

step one, a first magnesium metal block layer 1, a porous titanium block layer 2 and a second magnesium metal block layer 3 are sequentially overlapped under a solid condition to form a physical stack, wherein the porosity of the porous titanium block layer 2 is 30%;

injecting the first magnesium metal block layer 1, the porous titanium block layer 2 and the second magnesium metal block layer 3 into the porous titanium block layer 2 through frictional heat or an external heat source under the pressure conditions of 350 ℃ and 5000N to form a magnesium-titanium mixture with a sandwich structure, wherein the blocky metal fiber layer 2, the first solid blocky aluminum alloy layer 1 and the second solid blocky aluminum alloy layer 3 are formed;

and step three, placing the magnesium-titanium mixture of the sandwich structure into an HF solution, selectively removing metallic titanium, and finally obtaining the porous magnesium metal body of the sandwich plate structure, wherein the porous magnesium metal body consists of a first magnesium interlayer 4, a second magnesium interlayer 6 and a porous magnesium core layer 5 positioned between the first magnesium interlayer 4 and the second magnesium interlayer 6.

The second step and the third step are realized by friction stir welding equipment, pressure is applied by a friction stir welding head, the rotating speed of the friction stir welding head is 1000r/min, the feeding is 1m/min, the stirring frequency range is 6 times, and the rolling rate is 40%.

The diameter range of the stirring pin of the stirring head is 6mm, and the length range is 4 mm; the diameter of the shaft shoulder is 20 mm.

The thickness range of the porous titanium block layer 2 is 4mm, the diameter range of titanium wires in the porous titanium block layer 2 is 0.1-0.3 mm, and the thicknesses of the first magnesium metal block layer 1 and the second magnesium metal block layer 3 are 4 mm.

The soaking time in the third step is 5min, the mass concentration of the HF solution is 10%, and the temperature of the HF solution is between room temperature and 100 ℃.

The bonding force between the porous magnesium core layer and the first magnesium interlayer and the bonding force between the porous magnesium core layer and the second magnesium interlayer are 300MPa, and the strength range of the porous magnesium core layer 5 is 300 MPa.

The strength of the first magnesium interlayer 4 and the second magnesium interlayer 6 was 400 MPa.

The first magnesium metal bulk layer 1 and the second magnesium metal bulk layer 3 are magnesium bulk layers.

Example 2: a preparation process of reinforced porous magnesium metal comprises the following steps:

step one, a first magnesium metal block layer 1, a porous titanium block layer 2 and a second magnesium metal block layer 3 are sequentially overlapped under a solid condition to form a physical stack, wherein the porosity of the porous titanium block layer 2 is 42%;

secondly, injecting the first magnesium metal block layer 1, the porous titanium block layer 2 and the second magnesium metal block layer 3 into the porous titanium block layer 2 through frictional heat or an external heat source under the pressure conditions of 450 ℃ and 8000N to form a magnesium-titanium mixture with a sandwich structure, wherein the block metal fiber layer 2, the first solid block aluminum alloy layer 1 and the second solid block aluminum alloy layer 3 are arranged in the porous titanium block layer 2;

and step three, placing the magnesium-titanium mixture of the sandwich structure into an HF solution, selectively removing metallic titanium, and finally obtaining the porous magnesium metal body of the sandwich plate structure, wherein the porous magnesium metal body consists of a first magnesium interlayer 4, a second magnesium interlayer 6 and a porous magnesium core layer 5 positioned between the first magnesium interlayer 4 and the second magnesium interlayer 6.

The pressure applied by the rolling mill is 8000N, the rolling temperature is 450 ℃, the rolling frequency is 10 times, and the rolling rate is 60%.

The thickness range of the porous titanium block layer 2 is 6mm, the diameter range of titanium wires in the porous titanium block layer 2 is 0.02-0.05 mm, and the thicknesses of the first magnesium metal block layer 1 and the second magnesium metal block layer 3 are 8 mm.

The soaking time in the third step is 1H, the mass concentration of the HF solution is 10 percent, and the temperature of the HF solution is between room temperature and 100 ℃.

The bonding force of the porous magnesium core layer, the first magnesium interlayer and the second magnesium interlayer is 350 MPa.

The strength of the porous magnesium core layer 5 is 350MPa, and the strength of the first magnesium interlayer 4 and the second magnesium interlayer 6 is 500 MPa.

The first magnesium metal bulk layer 1 and the second magnesium metal bulk layer 3 are magnesium alloy bulk layers.

When the preparation process of the reinforced porous magnesium metal is adopted, the cost is low, the process is simple, the strength is improved by 50-300% compared with that of a traditional assembly-connection method, a rolling tissue is formed, the structural strength is improved by 30-260% compared with that of a traditional core, the state change does not exist, the defects of pores, holes and the like are avoided, the volumes of the core and an interlayer can be accurately controlled, and the flow line production is easy to realize.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.