CN114507805B - Method for preparing foam steel through foaming - Google Patents
Method for preparing foam steel through foaming Download PDFInfo
- Publication number
- CN114507805B CN114507805B CN202011279228.0A CN202011279228A CN114507805B CN 114507805 B CN114507805 B CN 114507805B CN 202011279228 A CN202011279228 A CN 202011279228A CN 114507805 B CN114507805 B CN 114507805B
- Authority
- CN
- China
- Prior art keywords
- steel
- molten steel
- foaming
- foam
- nano
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/08—Alloys with open or closed pores
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/08—Alloys with open or closed pores
- C22C1/083—Foaming process in molten metal other than by powder metallurgy
- C22C1/086—Gas foaming process
Abstract
The invention relates to a method for preparing foam steel by foaming, which comprises the steps of firstly adding a tackifier with foaming effect, which is composed of nano CaCO3 and iron powder, into molten steel after smelting, then adding a composite foaming agent composed of manganese nitride and chromium nitride, foaming in vacuum, and cooling to obtain the foam steel. The invention takes the mixture of chromium nitride and manganese nitride as the composite foaming agent, can continuously foam, is more beneficial to the control of the foaming process, and thus ensures the performance of the foam steel; meanwhile, the nano calcium oxide generated after the tackifier with foaming effect and the nano calcium carbonate are decomposed is uniformly dispersed in the steel and is used as a heterogeneous core for molten steel solidification, so that the rapid solidification of the molten steel is facilitated, and the performance of the foamed steel is improved.
Description
Technical Field
The invention relates to the technical field of foam steel production, in particular to a method for preparing foam steel through foaming.
Background
The foam steel is a structure-function integrated material with a large number of communicated or non-communicated holes uniformly distributed in a steel matrix. As a functional material, the material has multiple performances of sound absorption, heat insulation, flame retardance, electromagnetic shielding and the like. As a structural material, the steel density, elastic modulus and yield strength can be varied by varying the porosity and pore structure. Under the condition of the same steel consumption, the reasonable design can effectively improve the overall stability and the local stability of the structural member, thereby improving the bearing capacity and achieving the purpose of saving steel.
At present, the preparation method of the foam steel mainly comprises a melt metal foaming method, a metal deposition method, a hollow sphere sintering method, a seepage method and a powder sintering method. The hollow sphere method has the defects of difficult preparation of hollow spheres, high requirements on process equipment and the like; the seepage method has long process flow and difficult complete removal of precursors. The powder sintering method is a preparation method with simple process and low cost, and the porosity, the pore diameter and the pore size distribution of the powder sintering method can be effectively controlled.
Chinese patent with publication number CN103266259B discloses a vacuum foaming preparation method of foam steel, which comprises the steps of steel melting, steel melt tackifying, initial air hole generation in the steel melt, vacuum foaming and foam steel melt cooling to finally obtain the foam steel with porosity of 70-85% and pore diameter of 0.5-5 mm. The invention is as followsSiC is used as a tackifier to tackify the steel melt, a small amount of Cr2N is added into the SiC tackified steel melt, gas generated by decomposition of Cr2N and Cr2N is dispersed by stirring, so that initial pores which are uniformly distributed, numerous and fine are generated in the steel melt, and then foaming is carried out in vacuum to prepare the foam steel. The porosity and pore structure of the foam steel can be controlled by controlling the distribution, the number, the size, the vacuum degree, the foaming time and the like of the generated initial pores, and the foam steel with excellent performance can be prepared in a short time. The invention has the characteristics of high efficiency, simple process, controllable pore structure, stable process and the like, and can realize industrial production. According to the technical scheme, SiC is used as a tackifier to perform tackifying treatment on the steel melt, but SiC has large particles and can directly influence the performance of the foam steel, and Cr is used for the SiC 2 Nitrogen generated by N decomposition is used as a pore-forming agent, and because the chromium nitride decomposition interval is narrow, the air holes are not easy to control in the preparation process, and ideal foam steel cannot be obtained; since the temperature of molten steel is high, the quality of molten steel is seriously deteriorated by using a stirring apparatus in the molten steel.
Chinese patent with publication number CN101381822B discloses a method and a device for preparing porous foam steel by melt foaming, wherein a foaming agent is firstly paved at the bottom of a crucible, and a stainless steel mesh is covered on the top to prevent the foaming agent from floating upwards; and then, placing the crucible into a heating furnace, heating to 50-100 ℃ below the decomposition starting temperature of the foaming agent, pouring molten steel after melting into the crucible, adjusting the temperature of the molten steel in the crucible to be 250-350 ℃ above the decomposition starting temperature of the foaming agent by using a heat preservation heating device, preserving heat, stirring for 1-2 min, taking out the crucible, and air-cooling to room temperature to obtain the porous foamed steel material. The method can increase the residence time of the molten steel in the decomposition temperature interval of the foaming agent, prevent the foaming agent from floating upwards, improve the structural characteristics and the distribution characteristics of holes for preparing samples, and has simple process and easy operation. According to the technical scheme, the stainless steel net is covered on the foaming agent to prevent the foaming agent from floating upwards and increase the retention time of the molten steel in the decomposition temperature range of the foaming agent, but the stainless steel net only has the function of delaying, cannot effectively control the reaction effect of the foaming agent and has no substantial effect.
Therefore, it is urgently needed to develop a preparation method of the foam steel, which can continuously foam in the molten steel, does not need to increase a stirring device, does not have adverse effect on the performance of the foam steel by the tackifier, and can even improve the performance of the foam steel.
Disclosure of Invention
The invention provides a method for preparing foam steel by foaming, which takes a mixture of chromium nitride and manganese nitride as a composite foaming agent, can continuously foam, and is more beneficial to the control of a foaming process, thereby ensuring the performance of the foam steel; meanwhile, the nano calcium oxide generated after the tackifier with foaming effect and the nano calcium carbonate are decomposed is uniformly dispersed in the steel and is used as a heterogeneous core for molten steel solidification, so that the rapid solidification of the molten steel is facilitated, and the performance of the foamed steel is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a process for preparing foam steel by foaming includes such steps as adding nano CaCO to molten steel 3 And a tackifier with a foaming effect consisting of iron powder, then adding a composite foaming agent consisting of manganese nitride and chromium nitride, foaming under vacuum, and cooling to obtain the foam steel.
A method for preparing foam steel through foaming specifically comprises the following steps:
1) nano CaCO 3 Mixing with iron powder: nano CaCO 3 Uniformly mixing the powder and iron powder according to the mass ratio of 1 (10-20), and cold-pressing the mixture into a material block with the thickness of 10mm multiplied by 50mm by a press machine under the pressure of 3-5 MPa to obtain the tackifier with the foaming function;
2) manganese nitride and chromium nitride mixed: uniformly mixing manganese nitride and chromium nitride according to the mass ratio of 1 (1-3) to obtain a composite foaming agent;
3) smelting molten steel: melting the steel raw materials by using a vacuum induction furnace under a non-vacuum condition, and controlling the temperature of molten steel after heating and melting to 1450-1550 ℃;
4) adding a tackifier and a composite foaming agent: firstly, adding a tackifier into molten steel; nano CaCO 3 The nano CaO is rapidly decomposed in the molten steel to generate nano CaO, and the nano CaO is dispersed in the molten steel to increase the molten steelThe viscosity of the molten steel acts as a nucleating agent when the molten steel is solidified, and CO gas is generated 2 (ii) a Adding a tackifier for 2min, and then adding a composite foaming agent into the molten steel; the manganese nitride and the chromium nitride generate nitrogen and CO in sequence in the decomposition process 2 And N 2 Are retained in molten steel in the form of bubbles;
5) and (3) vacuum cooling: after adding the composite foaming agent for 2min, vacuumizing a vacuum induction furnace, increasing water cooling, turning off a power supply, and carrying out vacuum foaming under the vacuum degree of 1-5 Pa to form a foam steel melt; and cooling and solidifying the foam steel melt under the vacuum condition to obtain the foam steel.
The nano CaCO 3 Middle CaCO 3 ≥90％。
The Fe in the iron powder is more than or equal to 99.9 percent, and the particle size of the iron powder is 100-400 meshes.
The nano CaCO 3 And uniformly mixing the iron powder and the mixture by adopting a ball mill for 2-5 hours.
The content of nitrogen in the manganese nitride is 5% -8%, and the granularity of the manganese nitride is 40-80 microns.
The content of nitrogen in the chromium nitride is 7% -15%, and the granularity of the chromium nitride is 40-80 microns.
The addition amount of the tackifier is 0.06-0.1% of the weight of the molten steel, and the tackifier is preheated to 420-460 ℃ before being added into the molten steel.
The addition amount of the composite foaming agent is 0.2-0.4% of the weight of the molten steel.
The aperture of the prepared foam steel is 0.6-1.2 mm, and the porosity is 75% -90%; the density is 2.6-3.8 g/cm 3 And product performance: the compressive yield strength is 150-220 MPa, and the energy absorption value at 50% compressive strain is 90-140 MJ/m 3 。
Compared with the prior art, the invention has the beneficial effects that:
1) the tackifier containing nano calcium carbonate is added into the molten steel and has a foaming effect, and the composite foaming agent consisting of chromium nitride and manganese nitride has different decomposition temperatures, so that nitrogen formed in the decomposition process can be ensured not to be discharged in a concentrated manner, namely, the foaming agent can be foamed continuously; CaO generated by decomposing nano calcium carbonate is further generated into CO 2， CO 2 And N 2 All remain as bubbles in the molten steel, thereby ensuring the performance of the foam steel.
2) The nano calcium oxide generated after the decomposition of the nano calcium carbonate is uniformly dispersed in the steel and used as a heterogeneous core for the solidification of the molten steel, thereby being beneficial to the rapid solidification of the molten steel and improving the performance of the foam steel.
3) The invention has simple process, does not need to add a stirring device, is safe and reliable and is convenient for actual operation and control.
Detailed Description
The invention relates to a method for preparing foam steel by foaming, which is characterized in that firstly nano CaCO is added into molten steel after smelting 3 And a tackifier with a foaming effect consisting of iron powder, then adding a composite foaming agent consisting of manganese nitride and chromium nitride, foaming under vacuum, and cooling to obtain the foam steel.
A method for preparing foam steel through foaming specifically comprises the following steps:
1) nano CaCO 3 Mixing with iron powder: nano CaCO 3 Uniformly mixing the powder and iron powder according to the mass ratio of 1 (10-20), and cold-pressing the mixture into a material block with the thickness of 10mm multiplied by 50mm by a press machine under the pressure of 3-5 MPa to obtain the tackifier with the foaming effect;
2) manganese nitride and chromium nitride mixed: uniformly mixing manganese nitride and chromium nitride according to the mass ratio of 1 (1-3) to obtain a composite foaming agent;
3) smelting molten steel: melting the steel raw materials by using a vacuum induction furnace under a non-vacuum condition, and controlling the temperature of molten steel after heating and melting to 1450-1550 ℃;
4) adding a tackifier and a composite foaming agent: firstly, adding a tackifier into molten steel; nano CaCO 3 The nano-CaO is rapidly decomposed in the molten steel to generate nano-CaO, the nano-CaO is dispersed in the molten steel to play a role of increasing the viscosity of the molten steel, and simultaneously, the nano-CaO is used as a nucleating agent when the molten steel is solidified and generates gas CO 2 (ii) a Adding a tackifier for 2min, and then adding a composite foaming agent into the molten steel; the manganese nitride and the chromium nitride generate nitrogen and CO in sequence in the decomposition process 2 And N 2 Are retained in the molten steel in the form of bubbles;
5) and (3) vacuum cooling: after adding the composite foaming agent for 2min, vacuumizing a vacuum induction furnace, increasing water cooling, turning off a power supply, and carrying out vacuum foaming under the vacuum degree of 1-5 Pa to form a foam steel melt; and cooling and solidifying the foam steel melt under the vacuum condition to obtain the foam steel.
The nano CaCO 3 Middle CaCO 3 ≥90％。
The Fe content in the iron powder is more than or equal to 99.9%, and the particle size of the iron powder is 100-400 meshes.
The nano CaCO 3 And uniformly mixing the iron powder and the mixture by adopting a ball mill for 2-5 hours.
The content of nitrogen in the manganese nitride is 5% -8%, and the granularity of the manganese nitride is 40-80 microns.
The content of nitrogen in the chromium nitride is 7% -15%, and the granularity of the chromium nitride is 40-80 microns.
The addition amount of the tackifier is 0.06-0.1% of the weight of the molten steel, and the tackifier is preheated to 420-460 ℃ before being added into the molten steel.
The addition amount of the composite foaming agent is 0.2-0.4% of the weight of the molten steel.
The aperture of the prepared foam steel is 0.6-1.2 mm, and the porosity is 75% -90%; the density is 2.6-3.8 g/cm 3 And product performance: the compressive yield strength is 150-220 MPa, and the energy absorption value at 50% compressive strain is 90-140 MJ/m 3 。
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation procedures are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ example 1 ]
In this embodiment, the preparation process of the foam steel is specifically as follows:
1. nano CaCO 3 Mixing with iron powder: nano CaCO 3 The particle size is 100 nanometers; the Fe content in the iron powder is 99.93 percent, and the particle size of the iron powder is 400 meshes; nano CaCO 3 Mixing the iron powder and the iron powder according to the mass ratio of 1: 10; the iron powder can realize the dispersion of the nano-materials by adopting a ball mill to mix uniformly for 5 hours, therebyA homogeneous mixed powder was obtained. And cold-pressing the mixture of the nano CaCO3 and the iron powder into a block with the diameter of 10mm multiplied by 50mm by a press machine under the pressure of 3MPa to obtain the tackifier.
2. Manganese nitride and chromium nitride mixed: the granularity of the manganese nitride and the granularity of the chromium nitride are both 40 microns, the nitrogen content in the manganese nitride is 8 percent, the nitrogen content in the chromium nitride is 7 percent, and the manganese nitride and the chromium nitride are mixed according to the mass ratio of 1: 2.
3. Smelting molten steel: a vacuum induction furnace is adopted to melt the steel raw materials under the non-vacuum condition, and the temperature of molten steel after heating and melting is controlled at 1550 ℃.
4. Adding a tackifier and a foaming agent: firstly, adding nano CaCO into molten steel 3 And iron powder, i.e. adhesion promoters, nano-CaCO 3 The nano-CaO is rapidly decomposed in the molten steel to generate nano-CaO, the nano-CaO is dispersed in the molten steel to play a role in increasing the viscosity of the molten steel, and simultaneously, the nano-CaO can be used as a nucleating agent when the molten steel is solidified and can generate gas CO 2 (ii) a The addition amount of the tackifier is 0.06 percent of the amount of molten steel, and the tackifier is preheated to 460 ℃ before being added into the molten steel; adding a tackifier 2min later, adding a foaming agent which is a mixture of manganese nitride and chromium nitride into the molten steel, wherein the addition amount of the foaming agent accounts for 0.2% of the molten steel amount, and the nitrogen formed in the decomposition process can be ensured not to be released concentratedly due to the difference of the decomposition temperatures of the manganese nitride and the chromium nitride. CO formed during the above reaction 2 And N 2 All can be kept in the steel as bubbles, which is beneficial to the control of the bubbles in the steel.
5. And (3) vacuum cooling: and after adding the foaming agent for 2min, vacuumizing the molten steel, increasing water cooling, turning off a power supply, performing vacuum foaming under the vacuum degree of 5Pa, and cooling and solidifying the foam steel melt under the vacuum condition to obtain the foam steel with the aperture of 0.9mm and the porosity of 75%.
The density of the foam steel produced in this example was 3.8g/cm 3 And product performance: the compressive yield strength is 220MPa, and the energy absorption value at 50% compressive strain is 140MJ/m 3.
[ example 2 ]
In this embodiment, the preparation process of the foam steel is specifically as follows:
1. nano CaCO 3 Mixing with iron powder: nano CaCO 3 The particle size is 70 nanometers; the Fe content in the iron powder is 99.95 percent, the particle size of the iron powder is 200 meshes, and the nano CaCO 3 Mixing the iron powder and the iron powder according to the mass ratio of 1: 20; and (3) uniformly mixing by adopting a ball mill for 2 hours, wherein the iron powder can realize the dispersion of nano-substances to obtain uniform mixed powder. The nano CaCO is pressed by a press under the pressure of 4MPa 3 And cold pressing the mixture with iron powder into blocks of 10mm multiplied by 50mm to obtain the tackifier.
2. Manganese nitride and chromium nitride mixed: the granularity of the manganese nitride and the granularity of the chromium nitride are both 60 micrometers, the nitrogen content in the manganese nitride is 7%, the nitrogen content in the chromium nitride is 10%, and the manganese nitride and the chromium nitride are mixed according to the mass ratio of 1: 1.
3. Smelting molten steel: a vacuum induction furnace is adopted to melt the steel raw materials under the non-vacuum condition, and the temperature of molten steel after heating and melting is controlled at 1500 ℃.
4. Adding a tackifier and a foaming agent: firstly, adding nano CaCO into molten steel 3 And iron powder, i.e. adhesion promoters, nano-CaCO 3 The nano-CaO is rapidly decomposed in the molten steel to generate nano-CaO, the nano-CaO is dispersed in the molten steel to play a role in increasing the viscosity of the molten steel, and simultaneously, the nano-CaO can be used as a nucleating agent when the molten steel is solidified and can generate gas CO 2 (ii) a The addition amount of the tackifier is 0.08 percent of the amount of molten steel, and the tackifier is preheated to 430 ℃ before being added into the molten steel; adding a tackifier for 2min, and then adding a foaming agent which is a mixture of manganese nitride and chromium nitride into the molten steel, wherein the addition amount of the foaming agent accounts for 0.3% of the molten steel amount, and the nitrogen formed in the decomposition process can be prevented from being discharged in a centralized manner due to the difference of the decomposition temperatures of the manganese nitride and the chromium nitride. CO formed during the above reaction 2 And N 2 All can be kept in the steel as bubbles, which is beneficial to the control of the bubbles in the steel.
5. And (3) vacuum cooling: and after adding the foaming agent for 2min, vacuumizing the molten steel, increasing water cooling, turning off a power supply, performing vacuum foaming under the vacuum degree of 1Pa, and cooling and solidifying the foam steel melt under the vacuum condition to obtain the foam steel with the aperture of 0.6mm and the porosity of 80%.
The density of the foam steel produced in this example was 3.2g/cm 3 And product performance: the compressive yield strength is 180MPa, and the energy absorption value at 50 percent compressive strain is 115MJ/m 3 。
[ example 3 ]
In this embodiment, the preparation process of the foam steel is specifically as follows:
1. nano CaCO 3 Mixing with iron powder: nano CaCO 3 Has a particle size of 20 nm; the Fe content in the iron powder is 99.96 percent, the granularity of the iron powder is 100 meshes, and the nano CaCO 3 Mixing the iron powder and the iron powder according to the mass ratio of 1: 15; and (3) uniformly mixing by adopting a ball mill for 4 hours, wherein the iron powder can realize the dispersion of the nano-substances to obtain uniform mixed powder. The nano CaCO is pressed by a press under the pressure of 5MPa 3 And cold-pressing the mixture with iron powder into blocks of 10mm multiplied by 50mm to obtain the tackifier.
2. Manganese nitride and chromium nitride mixed: the granularity of the manganese nitride and the granularity of the chromium nitride are both 80 microns, the nitrogen content in the manganese nitride is 5 percent, the nitrogen content in the chromium nitride is 15 percent, and the manganese nitride and the chromium nitride are mixed according to the mass ratio of 1: 3.
3. Smelting molten steel: a vacuum induction furnace is adopted to melt the steel raw materials under the non-vacuum condition, and the temperature of molten steel after heating and melting is controlled at 1450 ℃.
4. Adding a tackifier and a foaming agent: firstly, adding nano CaCO into molten steel 3 With iron powder, i.e. adhesion promoters, nano-CaCO 3 The nano-CaO is rapidly decomposed in the molten steel to generate nano-CaO, the nano-CaO is dispersed in the molten steel to play a role in increasing the viscosity of the molten steel, and simultaneously, the nano-CaO can be used as a nucleating agent when the molten steel is solidified and can generate gas CO 2 (ii) a The addition amount of the tackifier is 0.1 percent of the amount of molten steel, and the tackifier is preheated to 420 ℃ before being added into the molten steel; adding a tackifier for 2min, and then adding a foaming agent which is a mixture of manganese nitride and chromium nitride into the molten steel, wherein the addition amount of the foaming agent accounts for 0.2% of the molten steel amount, and the nitrogen formed in the decomposition process can be prevented from being discharged in a centralized manner due to the difference of the decomposition temperatures of the manganese nitride and the chromium nitride. CO formed during the above reaction 2 And N 2 All can be kept in the steel as bubbles, which is beneficial to the control of the bubbles in the steel.
5. And (3) vacuum cooling: and after adding the foaming agent for 2min, vacuumizing the molten steel, increasing water cooling, turning off a power supply, performing vacuum foaming under the vacuum degree of 3Pa, and cooling and solidifying the foam steel melt under the vacuum condition to obtain the foam steel with the aperture of 1.2mm and the porosity of 90%.
The density of the foam steel produced in this example was 2.6g/cm 3 And product performance: the compressive yield strength is 151MPa, and the energy absorption value at 50 percent compressive strain is 90MJ/m 3 。
When the foam steel is prepared, the tackifier with foaming effect and the composite foaming agent consisting of chromium nitride and manganese nitride are added into the molten steel, so that continuous foaming can be realized, and CO generated in the reaction process 2 And N 2 All can be kept in the steel as bubbles, and the performance of the foam steel can be ensured. The nano calcium oxide is uniformly dispersed in the steel and is used as a heterogeneous core for molten steel solidification, so that the rapid solidification is facilitated, and the performance of the foam steel is further improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. A method for preparing foam steel by foaming is characterized in that nano CaCO is added into molten steel after smelting 3 And a tackifier with a foaming effect consisting of iron powder, then adding a composite foaming agent consisting of manganese nitride and chromium nitride, foaming under vacuum, and cooling to obtain foam steel; the method specifically comprises the following steps:
1) nano CaCO 3 Mixing with iron powder: nano CaCO 3 Uniformly mixing the powder and iron powder according to the mass ratio of 1 (10-20), and cold-pressing the mixture into a material block with the thickness of 10mm multiplied by 50mm by a press machine under the pressure of 3-5 MPa to obtain the tackifier with the foaming function;
2) manganese nitride and chromium nitride mixed: uniformly mixing manganese nitride and chromium nitride according to the mass ratio of 1 (1-3) to obtain a composite foaming agent;
3) molten steel smelting: melting the steel raw materials by using a vacuum induction furnace under a non-vacuum condition, and controlling the temperature of molten steel after heating and melting to 1450-1550 ℃;
4) adding a tackifier and a composite foaming agent: firstly, adding a tackifier into molten steel, wherein the addition amount of the tackifier is 0.06-0.1% of the weight of the molten steel, and preheating the tackifier to 420-460 ℃ before adding the tackifier into the molten steel; nano CaCO 3 The nano-CaO is rapidly decomposed in the molten steel to generate nano-CaO, the nano-CaO is dispersed in the molten steel to play a role of increasing the viscosity of the molten steel, and simultaneously, the nano-CaO is used as a nucleating agent when the molten steel is solidified and generates gas CO 2 (ii) a Adding a tackifier for 2min, and then adding a composite foaming agent into the molten steel, wherein the addition amount of the composite foaming agent is 0.2-0.4% of the weight of the molten steel; the manganese nitride and the chromium nitride generate nitrogen and CO in sequence in the decomposition process 2 And N 2 Are retained in the molten steel in the form of bubbles;
5) and (3) vacuum cooling: after adding the composite foaming agent for 2min, vacuumizing a vacuum induction furnace, increasing water cooling, turning off a power supply, and carrying out vacuum foaming under the vacuum degree of 1-5 Pa to form a foam steel melt; and cooling and solidifying the foam steel melt under the vacuum condition to obtain the foam steel.
2. The method for preparing the foam steel by foaming as claimed in claim 1, wherein the nano CaCO 3 Middle CaCO 3 ≥90％。
3. The method for preparing the foam steel through foaming according to claim 1, wherein Fe in the iron powder is not less than 99.9%, and the particle size of the iron powder is 100-400 meshes.
4. The method for preparing the foam steel by foaming as claimed in claim 1, wherein the nano CaCO 3 And uniformly mixing the iron powder and the mixture by adopting a ball mill for 2-5 hours.
5. The method for preparing the foam steel by foaming according to claim 1, wherein the content of nitrogen in the manganese nitride is 5-8%, and the particle size of the manganese nitride is 40-80 microns.
6. The method for preparing the foam steel through foaming according to claim 1, wherein the content of nitrogen in the chromium nitride is 7-15%, and the particle size of the chromium nitride is 40-80 microns.
7. The method for preparing the foam steel by foaming according to claim 1, wherein the prepared foam steel has a pore diameter of 0.6-1.2 mm and a porosity of 75-90%; the density is 2.6-3.8 g/cm 3 The product performance is as follows: the compressive yield strength is 150-220 MPa, and the energy absorption value at 50% compressive strain is 90-140 MJ/m 3 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011279228.0A CN114507805B (en) | 2020-11-16 | 2020-11-16 | Method for preparing foam steel through foaming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011279228.0A CN114507805B (en) | 2020-11-16 | 2020-11-16 | Method for preparing foam steel through foaming |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114507805A CN114507805A (en) | 2022-05-17 |
| CN114507805B true CN114507805B (en) | 2022-09-16 |
Family
ID=81546141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011279228.0A Active CN114507805B (en) | 2020-11-16 | 2020-11-16 | Method for preparing foam steel through foaming |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114507805B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007290023A (en) * | 2006-04-27 | 2007-11-08 | Shinagawa Refract Co Ltd | Heat insulating material for molten metal vessel |
| CN100439526C (en) * | 2007-07-09 | 2008-12-03 | 东南大学 | Foamed aluminium and aluminum alloy tackifying foaming preparation method |
| CN103266259B (en) * | 2013-05-30 | 2015-12-09 | 昆明理工大学 | A kind of vacuum foam preparation method of blister steel |
| CN109777983A (en) * | 2017-11-13 | 2019-05-21 | 乐山创新智谷工业设计有限公司 | A kind of preparation method of high intensity foamed aluminium |
-
2020
- 2020-11-16 CN CN202011279228.0A patent/CN114507805B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114507805A (en) | 2022-05-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6242828B2 (en) | Method of manufacturing magnetocaloric element and magnetocaloric element obtained thereby | |
| CN109837415B (en) | Method for manufacturing foamed aluminum alloy | |
| CN109266939B (en) | Preparation method of high-density WC-WB-Co spherical powder hard-face material | |
| CN105669245B (en) | A kind of preparation method of porous silica ceramic | |
| CN104478337B (en) | A kind of foamed aluminium material | |
| CN111101012B (en) | Preparation method of closed-cell gradient foam material | |
| CN113582714B (en) | Heat insulation ceramic with high closed porosity and preparation method and application thereof | |
| CN102492866A (en) | Method for preparing closed-cell aluminum foam under combined action of electromagnetic stirring and mechanical stirring | |
| CN104818401A (en) | Friction stir welding method for preparing closed-cell foam metal | |
| CN110540414A (en) | Preparation method of nano microporous corundum | |
| CN114507805B (en) | Method for preparing foam steel through foaming | |
| CN104368805A (en) | Method for producing composite copper powder for ultrathin heat pipe | |
| CN107858542B (en) | A kind of micron pore size closed-cell foam composite material of magnesium alloy preparation method | |
| CN102584181B (en) | Method for preparing periclase-silicon carbide-carbon composite powder through in-situ reaction | |
| CN112899513B (en) | Foamed aluminum with open-close hole coexisting structure and preparation method thereof | |
| CN108483928A (en) | A kind of ferromagnetism foam pyroceram and the preparation method and application thereof | |
| CN102114542B (en) | Low-temperature sintering method for high-performance Fe-based powder metallurgy parts | |
| CN106399738A (en) | Melt foaming preparation method for foam magnesium | |
| CN110079694B (en) | Coated foaming agent, preparation method thereof and preparation method of foamed aluminum | |
| CN107779638A (en) | The preparation method of foaming agent and preparation method thereof and foamed aluminium | |
| CN111548189A (en) | Method for preparing foamed ceramic material by using ceramic polishing and grinding waste and blast furnace slag | |
| CN110467352A (en) | A kind of foam glass material and preparation method thereof | |
| CN107986811B (en) | Porous material obtained by combination of low-temperature solidification and directional annealing and preparation method thereof | |
| CN112679225A (en) | Porous ceramic material pore-forming agent and preparation method thereof | |
| CN107511482A (en) | A kind of method that foam metal is prepared by coke composite foamable agent |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |