CN115323281B - Fe-Cu-C base alloy material containing Al and Ti and preparation method thereof - Google Patents

Abstract

The invention relates to the technical field of powder metallurgy materials, and provides an Fe-Cu-C-based alloy material containing Al and Ti and a preparation method thereof, wherein the method comprises the following steps: proportioning 0.5-1.0wt.% of carbon, 5.0-20.0wt.% of copper, 3.0-14.0wt.% of aluminum and titanium, 0.5-1.0wt.% of stearic acid lubricant and the balance of iron, wherein the aluminum accounts for at least 1.0wt.% and the titanium accounts for at least 2.0wt.%. Mechanically mixing the raw material powder, and then preparing the Fe-Cu-C-based alloy material through pressing treatment and sintering treatment. According to the Fe-Cu-C based alloy material containing Al and Ti and the preparation method thereof, disclosed by the exemplary embodiment of the invention, the oxidation resistance of the alloy is improved by adding aluminum and titanium elements into the iron-based alloy, and the Fe-Cu-C based alloy material containing Al and Ti with excellent high-temperature oxidation resistance is obtained.

Description

A kind of Fe-Cu-C base alloy material containing Al and Ti and preparation method thereof

technical field

The invention relates to the technical field of powder metallurgy materials, in particular to an Fe-Cu-C-based alloy material containing Al and Ti and a preparation method thereof.

Background technique

High-temperature structural parts are widely used in the aerospace field. With the continuous development of special application scenarios, the requirements for key properties such as high-temperature strength and high-temperature oxidation resistance of high-temperature structural parts are also increasing. How to prepare high-temperature structural parts by replacing traditional iron-based metal materials with alloy materials that are easy to process and have excellent high-temperature strength and high-temperature oxidation resistance is the focus of research in this field.

In order to improve the oxidation resistance of traditional iron-based materials, many researchers have improved the oxidation resistance of the alloy by adding an anti-oxidation coating on the surface of the alloy. However, due to the limited thickness of the coating and the different thermal expansion coefficients of the coating, the substrate layer and the oxide layer that appears during the oxidation process, there are Internal stress, while the coating is consumed, the oxide layer will peel off, resulting in secondary oxidation of the material.

In iron-based materials, alloying elements such as Cr, Ni, Al, and Si are usually added to improve the oxidation resistance of the alloy. The order of the influence of each element on the high-temperature oxidation resistance of iron-based alloys is Al>Si>Cr> Ni. In actual development and application, the application of the above elements has the following disadvantages: 1) During the high temperature oxidation process, Ni needs to interact with other elements to have a certain influence on the oxidation resistance of iron-based superalloys. 2) When Cr is added to the iron-based alloy, the alloy will form a protective oxide film after oxidation, but there are a large number of cracks in the Fe-rich oxide layer, and the oxide layer is not dense. As the oxidation time prolongs, the oxidized outer layer peels off, resulting in secondary oxidation of the inner layer; moreover, the cost of adding Cr to the Fe-based alloy is high, which is not conducive to the production of materials. 3) When Al is added to the iron-based alloy, during the oxidation process, the alloy will form an Al ₂ O ₃ oxide film, and with the increase of Al content, the oxidation resistance of the alloy will increase, but the Al ₂ O ₃ oxide film will Poor strength, the higher the Al content, the more Al ₂ O ₃ formed during oxidation and the easier it is to peel off, and the addition of Al will significantly reduce the mechanical properties of the alloy, which limits the use of the alloy.

Therefore, how to overcome the deficiencies of the prior art and improve the high-temperature oxidation resistance of iron-based alloy materials has become a technical problem to be solved urgently.

Contents of the invention

In view of this, in order to solve the problem that the oxide film of traditional iron-based powder metallurgy materials is easy to crack during the oxidation process, resulting in poor oxidation resistance of the alloy, the present invention provides a Fe- The Cu-C-based alloy material and its preparation method improve the self-oxidation resistance of the alloy through component distribution and process control.

In one aspect, the present invention provides a Fe-Cu-C-based alloy material containing Al and Ti, including: carbon 0.5-1.0wt.%, copper 5.0-20.0wt.%, aluminum and titanium 3.0-14.0wt.%. , stearic acid lubricant 0.5-1.0wt.%, the balance is iron, wherein, aluminum is at least 1.0wt.%, titanium is at least 2.0wt.%.

Furthermore, the Fe-Cu-C-based alloy material containing Al and Ti of the present invention has an oxidation weight gain of not more than 80.4 mg/cm ² after being oxidized at 1000° C. for 20 hours.

On the other hand, the present invention provides a kind of preparation method of Fe-Cu-C base alloy material containing Al and Ti, comprising:

1. Ingredients

According to the following proportions: carbon 0.5-1.0wt.%, copper 5.0-20.0wt.%, aluminum and titanium 3.0-14.0wt.%, stearic acid lubricant 0.5-1.0wt.%, the balance is iron, Perform batching, wherein, aluminum is at least 1.0wt.%, titanium is at least 2.0wt.%, and raw material powder and lubricant are obtained;

2. Powder mixing

The raw material powder is mechanically mixed by a tank mill at room temperature, wherein 0.5-1.0wt.% of stearic acid lubricant is added during mixing, the mixing speed is 500-600rpm, and the mixing time is 60-180min to obtain a mixed Powder;

3. Compression treatment

Press the mixed powder with a powder hydraulic press at room temperature, the form of pressing is dry pressing, the pressing pressure is 400-700MPa, and the holding time is 30-60s to obtain a pressed green body;

4. Sintering treatment

The pressed green body is sintered in a non-oxidizing protective atmosphere, the sintering temperature is 1050-1250°C, the sintering time is 60-180min, and the heating rate is 5°C/min to obtain a Fe-Cu-C-based alloy containing Al and Ti Material.

Further, in step 1 of the preparation method of the Fe-Cu-C-based alloy material containing Al and Ti of the present invention, iron, copper and carbon are elemental powders, wherein the particle size of the iron elemental powder is 30-150 μm, and the particle size of the copper elemental powder is 10-50μm, the particle size of carbon elemental powder is 2-10μm.

Further, in step 1 of the preparation method of the Fe-Cu-C-based alloy material containing Al and Ti of the present invention, aluminum is one of elemental powder, aluminum-titanium alloy powder or iron-aluminum alloy powder, wherein the particle size of the aluminum elemental powder is 1-5μm, the particle size of aluminum-titanium alloy powder is 10-50μm, and the particle size of iron-aluminum alloy powder is 50-75μm.

Further, in step 1 of the preparation method of the Fe-Cu-C-based alloy material containing Al and Ti of the present invention, titanium is one of elemental powder, aluminum-titanium alloy powder or iron-titanium alloy powder, wherein the particle size of the titanium elemental powder is 1-5μm, the particle size of aluminum-titanium alloy powder is 10-50μm, and the particle size of iron-titanium alloy powder is 50-75μm.

Further, in step 1 of the preparation method of the Fe-Cu-C-based alloy material containing Al and Ti of the present invention, the molar ratio of Al to Ti in the aluminum-titanium alloy is 1:3, and the molar ratio of Fe to Al in the iron-aluminum alloy The molar ratio of Fe and Ti in the iron-titanium alloy is 2:1.

Further, in step 1 of the preparation method of the Fe-Cu-C-based alloy material containing Al and Ti of the present invention, the stearic acid lubricant is one of stearic acid or zinc stearate.

Furthermore, in step 4 of the method for preparing the Fe-Cu-C-based alloy material containing Al and Ti of the present invention, the non-oxidizing protective atmosphere is a pure hydrogen atmosphere or a nitrogen-hydrogen mixed atmosphere.

Further, in the nitrogen-hydrogen mixed atmosphere of the preparation method of the Fe-Cu-C-based alloy material containing Al and Ti of the present invention, the volume ratio of nitrogen to hydrogen is 10:90.

The Fe-Cu-C-based alloy material containing Al and Ti and the preparation method thereof of the present invention have the following beneficial effects:

1. By adding aluminum and titanium elements, the phenomenon of preferential optimization of the sample surface during the oxidation process of the alloy is improved, so that the alloy material forms a relatively dense oxidized surface during the oxidation process, thereby improving the oxidation resistance of the alloy.

2. By adding aluminum and titanium elements, the problem of large difference in thermal expansion coefficient between the oxide layer and the base layer during the oxidation process of iron-based alloy materials is improved, the adhesion between the oxide layer and the base layer is improved, and cracking of the oxide layer is avoided. Thereby improving the oxidation resistance of the alloy.

3. The preparation method of the present invention has the advantages of simple operation, low energy consumption, low cost and high production efficiency, and is suitable for industrial popularization and application.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is the flow chart of the preparation method of the Fe-Cu-C base alloy material containing Al and Ti of exemplary embodiment 1-5 of the present invention;

Fig. 2 is a graph showing the weight gain per unit area after the material sample is oxidized at 1000° C. for 20 h according to exemplary embodiments 1-5 of the present invention and comparative examples;

3 is an oxidation cross-sectional SEM diagram and an EDS spectrum diagram of a material sample prepared according to exemplary embodiment 2 of the present invention;

Fig. 4 is the SEM image of the oxidized surface of the material sample prepared according to exemplary embodiment 3 of the present invention;

5 is an oxidation cross-sectional SEM diagram and an EDS spectrum diagram of a material sample prepared according to exemplary embodiment 4 of the present invention;

6 is an oxidation cross-sectional SEM diagram of a material sample prepared according to exemplary embodiment 5 of the present invention;

Fig. 7 is the SEM figure of the oxidized surface of the material sample prepared according to the comparative example of the present invention;

Fig. 8 is an oxidation cross-sectional SEM image of a material sample prepared according to a comparative example of the present invention.

Detailed ways

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

It should be noted that, in the case of no conflict, the following embodiments and the features in the embodiments can be combined with each other; and, based on the embodiments in the present disclosure, those of ordinary skill in the art obtained without creative work All other embodiments belong to the protection scope of the present disclosure.

Fig. 1 is a flow chart of the preparation method of the Fe-Cu-C-based alloy material containing Al and Ti of the present invention; Examples 1 to 5 of the present invention are preferred embodiments of the method shown in Fig. 1 .

Example 1

1. Ingredients

According to the following proportions: 0.8wt.% carbon, 5.0wt.% copper, 1.0wt.% aluminum, 2.0wt.% titanium, 0.7wt.% stearic acid, and the balance is iron. And carbon is elemental powder, the particle size of iron elemental powder is 30-150 μm, the particle size of copper elemental powder is 10-50 μm, the particle size of carbon elemental powder is 2-10 μm; aluminum is elemental powder, the particle size of aluminum elemental powder is 1-5 μm; titanium is elemental Powder, the particle size of the titanium elemental powder is 1-5 μm, and the raw material powder and stearic acid lubricant are obtained;

2. Powder mixing

Mechanically mix the raw material powders by means of a tank mill at room temperature, wherein 0.7 wt.% stearic acid is added as a lubricant during mixing, the mixing speed is 500 rpm, and the mixing time is 60 minutes to obtain mixed powders;

3. Compression treatment

At room temperature, the mixed powder is pressed by a powder hydraulic press, the pressing form is dry pressing, the pressing pressure is 500MPa, and the holding time is 30s to obtain a pressed green body with a green density of 6.60g/cm ³ ;

4. Sintering treatment

The pressed green body was sintered in a protective atmosphere of pure hydrogen, the sintering temperature was 1050°C, the sintering time was 180min, and the heating rate was 5°C/min to obtain the Fe-Cu-C-based alloy material containing Al and Ti.

Example 2

1. Ingredients

According to the following proportions: 0.8wt.% carbon, 10.0wt.% copper, 2.0wt.% aluminum, 2.0wt.% titanium, 0.5wt.% stearic acid, the balance is iron, and the ingredients are carried out, wherein iron , Copper and carbon are elemental powders, the particle size of iron elemental powder is 30-150 μm, the particle size of copper elemental powder is 10-50 μm, the particle size of carbon elemental powder is 2-10 μm; aluminum is elemental powder, the particle size of aluminum elemental powder is 1-5 μm; titanium It is elemental powder, the particle size of titanium elemental powder is 1-5 μm, and raw material powder and stearic acid lubricant are obtained;

2. Powder mixing

Mechanically mix the raw material powders with a tank mill at room temperature, wherein 0.5wt.% stearic acid is added as a lubricant during mixing, the mixing speed is 550rpm, and the mixing time is 120min to obtain mixed powders;

3. Compression treatment

At room temperature, the mixed powder is pressed by a powder hydraulic press, the pressing form is dry pressing, the pressing pressure is 550MPa, and the holding time is 45s to obtain a pressed green body with a green density of 6.61g/cm ³ ;

4. Sintering treatment

The pressed green body was sintered in a nitrogen-hydrogen mixed atmosphere with a volume ratio of nitrogen to hydrogen of 10:90, the sintering temperature was 1140 °C, the sintering time was 90 min, and the heating rate was 5 °C/min to obtain Al and Ti. Fe-Cu-C based alloy material.

Example 3

1. Ingredients

According to the following proportioning: 0.5wt.% of carbon, 15.0wt.% of copper, 4.0wt.% of aluminum, 10.0wt.% of titanium, 0.8wt.% of sodium stearate, and the balance is iron for batching, wherein, Iron, copper and carbon are elemental powders, the particle size of iron elemental powder is 30-150 μm, the particle size of copper elemental powder is 10-50 μm, the particle size of carbon elemental powder is 2-10 μm; aluminum is elemental powder, the particle size of aluminum elemental powder is 1-5 μm; The titanium is proportioned in the form of iron-titanium alloy powder, the particle size of the iron-titanium alloy powder is 50-75 μm, the molar ratio of Fe and Ti in the iron-titanium alloy is 2:1, and raw material powder and sodium stearate lubricant are obtained;

2. Powder mixing

Mechanically mix the raw material powders at room temperature through a tank mill, wherein 0.8wt.% sodium stearate is added as a lubricant during mixing, the mixing speed is 600rpm, and the mixing time is 120min to obtain mixed powders;

3. Compression treatment

At room temperature, the mixed powder is pressed by a powder hydraulic press, the pressing form is dry pressing, the pressing pressure is 700MPa, and the holding time is 40s to obtain a pressed green body with a green density of 7.43g/cm ³ ;

4. Sintering treatment

The pressed green body was sintered in a protective atmosphere of pure hydrogen, the sintering temperature was 1100°C, the sintering time was 60min, and the heating rate was 5°C/min to obtain the Fe-Cu-C-based alloy material containing Al and Ti.

Example 4

1. Ingredients

According to the following proportions: 0.8wt.% carbon, 20.0wt.% copper, 8.0wt.% aluminum, 2.0wt.% titanium, 0.9wt.% stearic acid, and the balance is iron. , copper and carbon are elemental powders, the particle size of iron elemental powder is 30-150 μm, the particle size of copper elemental powder is 10-50 μm, and the particle size of carbon elemental powder is 2-10 μm. The proportion of aluminum is in the form of iron-aluminum alloy powder, the particle size of iron-aluminum alloy powder is 50-75μm, and the molar ratio of Fe and Al in iron-aluminum alloy is 3:1; titanium is elemental powder, and the particle size of titanium elemental powder is 1-5μm. Obtain raw material powder and lubricant;

2. Powder mixing

At room temperature, the raw material powder is mechanically mixed by a pot mill, wherein 0.9wt.% of stearic acid is added as a lubricant during mixing, and 0.9wt.% of stearic acid lubricant is added during mixing, and the mixing speed is 600rpm, the mixing time is 120min, and the mixed powder is obtained;

3. Compression treatment

At room temperature, the mixed powder is pressed by a powder hydraulic press, the form of pressing is dry pressing, the pressing pressure is 600MPa, and the holding time is 50s to obtain a pressed green body with a green density of 7.31g/cm ³ ;

4. Sintering treatment

The pressed green body was sintered in a protective atmosphere of pure hydrogen, the sintering temperature was 1100°C, the sintering time was 120min, and the heating rate was 5°C/min to obtain the Fe-Cu-C-based alloy material containing Al and Ti.

Example 5

1. Ingredients

According to the following proportioning: 1.0wt.% carbon, 15wt.% copper, 1.0wt.% aluminum, 5.0wt.% titanium, 1.0wt.% zinc stearate, and the balance is iron. , copper and carbon are elemental powders, the particle size of iron elemental powder is 30-150 μm, the particle size of copper elemental powder is 10-50 μm, and the particle size of carbon elemental powder is 2-10 μm; aluminum and titanium are all in the form of aluminum-titanium alloy powder, aluminum The particle size of the titanium alloy powder is 10-50 μm, the molar ratio of Al to Ti in the aluminum-titanium alloy is 1:3, and the raw material powder and the zinc stearate lubricant are obtained;

2. Powder mixing

The raw material powder was mechanically mixed by a tank mill at room temperature, wherein 1.0 wt.% zinc stearate was added as a lubricant during mixing, the mixing speed was 550 rpm, and the mixing time was 180 min to obtain a mixed powder;

3. Compression treatment

At room temperature, the mixed powder is pressed by a powder hydraulic press, the pressing form is dry pressing, the pressing pressure is 400MPa, and the holding time is 60s to obtain a pressed green body with a green density of 7.11g/cm ³ ;

4. Sintering treatment

The pressed green body was sintered in a nitrogen-hydrogen mixed atmosphere with a volume ratio of nitrogen to hydrogen of 10:90, the sintering temperature was 1250 °C, the sintering time was 60 min, and the heating rate was 5 °C/min to obtain Al and Ti. Fe-Cu-C based alloy material.

Embodiment 6 (comparative example)

1. Ingredients

According to the following proportioning: carbon 0.8wt.%, copper 10wt.%, stearic acid 0.7wt.%, the balance is iron, carry out batching, wherein, iron, copper and carbon are elemental powder, iron elemental powder particle size is 30- 150 μm, the particle size of copper elemental powder is 10-50 μm, and the particle size of carbon elemental powder is 2-10 μm, to obtain raw material powder and stearic acid lubricant;

2. Powder mixing

Mechanically mix the raw material powders with a pot mill at room temperature, wherein 0.7wt.% stearic acid is added as a lubricant during mixing, the mixing speed is 550rpm, and the mixing time is 120min to obtain mixed powders;

3. Compression treatment

At room temperature, the mixed powder is pressed by a powder hydraulic press, the pressing form is dry pressing, the pressing pressure is 500MPa, and the holding time is 45s to obtain a pressed green body with a green density of 6.65g/cm ³ ;

4. Sintering treatment

The pressed green body was sintered in a pure hydrogen protective atmosphere at a sintering temperature of 1100°C, a sintering time of 120min, and a heating rate of 5°C/min to obtain Fe-based materials.

Example 7

Adopt the Archimedes drainage method to carry out the density test to the pressed green body prepared by embodiment 1-5 and the pressed green body prepared by embodiment 6, test result is shown in Table 1, and wherein, used balance is electronic balance in the test process, precision is 0.0001. The sample numbers are FCC1, FCC2, FCC3, FCC4, FCC5 and FCC0.

Table 1

Example Sample No Added form of aluminum or titanium Compression pressure MPa Green density g/cm³ Example 1 FCC1 Elemental metal powder 500 6.60 Example 2 FCC2 Elemental metal powder 550 6.61 Example 3 FCC3 Titanium Aluminum Alloy Powder 700 7.43 Example 4 FCC4 Iron Aluminum Alloy Powder 600 7.31 Example 5 FCC5 Al-Ti Alloy Powder 400 7.11 Example 6 FCC0 - 500 6.65

After grinding and polishing the Fe-Cu-C-based alloy material containing Al and Ti prepared in Examples 1-5 and the Fe-based material prepared in Example 6, the above-mentioned materials were cut into specifications of 4mm×4mm× 8mm oxidized sample, and then the oxidized sample was polished with 200#, 400#, 600#, 800#, 1200# SiC sandpaper in sequence, and then polished, and finally the polished sample was ultrasonically cleaned and dried for later use. The sample numbers are FCC1, FCC2, FCC3, FCC4, FCC5 and FCC0.

According to the Aviation Industry Standard HB 5258-2000 of the People's Republic of China "Methods for Determination of Oxidation Resistance of Steel and Superalloys", the samples prepared according to Examples 1-6 were tested for oxidation resistance, wherein the oxidation test adopted cyclic oxidation, The specific steps are: measure and weigh the size of the sample, and record it, then put the sample into a small crucible for weighing; raise the temperature of the muffle furnace to the target temperature, and then put the small crucible with the sample into the furnace In the process, start timing after the temperature of the muffle furnace returns to the target temperature, and take samples every 1.0h in the first 10h, weigh and record the crucible after it cools down to room temperature, and take samples every 10h within 10.0-20.0h. The oxidation weight gain of the obtained samples was calculated to obtain the weight gain per unit area of each alloy sample. The weight gain data per unit area of the alloy after oxidizing for 20.0h is shown in Table 2 and Figure 2.

Table 2

Example Sample No Added form of aluminum or titanium lubricant Weight gain per unit area/mg/cm² Example 1 FCC1 Elemental metal powder stearic acid 73.4 Example 2 FCC2 Elemental metal powder stearic acid 78.9 Example 3 FCC3 Titanium Aluminum Alloy Powder Zinc stearate 57.7 Example 4 FCC4 Iron Aluminum Alloy Powder stearic acid 65.0 Example 5 FCC5 Al-Ti Alloy Powder Zinc stearate 80.4 Example 6 FCC0 - stearic acid 100.4

As shown in Table 2 and Figure 2, the oxidation weight gain of the samples prepared in each embodiment is different after being oxidized at 1000°C for 20 hours. In the oxidation process, the weight gain per unit area of the alloy after adding Al and Ti elements is lower than that of the alloy without addition, indicating that its oxidation resistance is due to the addition of alloying elements Al and Ti to the iron-based alloy. Combining the oxidized surface and oxidized cross-section, it can be known that the weight gain per unit area results match the oxidized surface and oxidized cross-section diagram.

Adopt Hitachi SU8020 cold field emission scanning electron microscope to characterize the oxidation cross-section of the sample (sample numbers are respectively FCC2, FCC3, FCC4, FCC5, FCC0) after cyclic oxidation 20h under 1000 DEG C prepared in embodiment 2-6, carry out Refer to Figure 3 for the oxidation cross-section SEM diagram and EDS energy spectrum of the sample prepared in Example 2; refer to Figure 4 for the oxidation surface SEM diagram of the sample prepared in Example 3; see Figure 4 for the oxidation cross-section SEM diagram and EDS energy spectrum of the sample prepared in Example 4 See Figure 5; see Figure 6 for the SEM image of the oxidized surface of the sample prepared in Example 5; see Figure 7 and Figure 8 for the SEM image of the oxidized surface and cross-section of the sample prepared in Example 6.

As shown in Figure 3, the oxide layer of the material prepared in Example 2 is well bonded to the base layer, and no obvious cracks are found. From the results of energy spectrum, it can be seen that the oxygen content gradually decreases from the outside to the inside.

As shown in FIG. 4 , the oxidized surface of the material prepared in Example 3 forms a relatively dense oxide layer during the oxidation process, and at the same time, no obvious protrusions and preferential oxidation regions are generated.

As shown in FIG. 5 , the oxide layer of the material prepared in Example 4 is well bonded to the base layer, and no obvious cracks are found. It can be seen from the results of the energy spectrum that the mass percentage of each element is Fe: Cu: Al: Ti = 42.6: 20.3: 7.8: 1.6, which basically meets the ratio of the alloy raw materials.

As shown in Figure 6, the material prepared in Example 5 had an obvious oxide layer after oxidation, and the oxide layer was well bonded to the base layer, no obvious cracks were found, and the base layer was relatively dense.

As shown in Figure 7 and Figure 8, after oxidation of the material prepared in Example 6, there are many isolated island-like areas on the surface of the alloy, indicating that the alloy has preferential oxidation during the oxidation process; at the same time, in the oxidized cross-section after oxidation, cracks appear in the outer layer of oxidation , There are also cracks and spalling pits at the junction between the oxide outer layer and the base layer. Compared with the material samples prepared in Examples 2-5, the material samples prepared in Example 6 without adding Al and Ti had more obvious oxidation, and their oxidation resistance was significantly lower than that of the alloys added with alloying elements.

It should be noted that the Fe-Cu-C-based alloy material containing Al and Ti with good oxidation resistance prepared according to the embodiment of the present invention can significantly improve the thermal expansion between the oxide layer and the base layer during the oxidation process of the iron-based alloy. The problem of large differences in coefficients can improve the problem that the formed oxide film is easy to peel off, and improve the adhesion between the oxide layer and the base layer, thereby improving the oxidation resistance of the alloy.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (5)

1. A method for preparing an Fe-Cu-C-based alloy material containing Al and Ti, characterized in that, the method comprises: 1. Ingredients According to the following proportions: carbon 0.5-1.0wt.%, copper 5.0-20.0wt.%, aluminum and titanium 3.0-14.0wt.%, stearic acid lubricant 0.5-1.0wt.%, the balance is iron, Perform batching, wherein the aluminum is at least 1.0wt.%, and the titanium is at least 2.0wt.%, to obtain raw material powder and lubricant; wherein, aluminum is one of elemental powder, aluminum-titanium alloy powder or iron-aluminum alloy powder, Titanium is one of elemental powder, aluminum-titanium alloy powder or iron-titanium alloy powder; the particle size of aluminum elemental powder is 1-5 μm, the particle size of aluminum-titanium alloy powder is 10-50 μm, the particle size of iron-aluminum alloy powder is 50-75 μm, and the particle size of titanium elemental The particle size of the powder is 1-5μm, the particle size of the iron-titanium alloy powder is 50-75μm; the molar ratio of Al to Ti in the aluminum-titanium alloy is 1:3, the molar ratio of Fe to Al in the iron-aluminum alloy is 3:1, the iron-titanium alloy The molar ratio of Fe and Ti in the medium is 2:1; 2. Powder mixing The raw material powder is mechanically mixed by a tank mill at room temperature, wherein 0.5-1.0wt.% of stearic acid lubricant is added during mixing, the mixing speed is 500-600rpm, and the mixing time is 60-180min to obtain a mixed Powder; 3. Compression treatment Press the mixed powder with a powder hydraulic press at room temperature, the form of pressing is dry pressing, the pressing pressure is 400-700MPa, and the holding time is 30-60s to obtain a pressed green body; 4. Sintering treatment The pressed green body is sintered in a non-oxidizing protective atmosphere, the sintering temperature is 1050-1250°C, the sintering time is 60-180min, and the heating rate is 5°C/min to obtain a Fe-Cu-C-based alloy containing Al and Ti Material. 2. the method for preparing Fe-Cu-C-based alloy material containing Al and Ti according to claim 1, characterized in that, in step 1, iron, copper and carbon are elemental powders, wherein the iron elemental powder particle size is 30 -150μm, the particle size of copper elemental powder is 10-50μm, and the particle size of carbon elemental powder is 2-10μm. 3. the method for preparing Fe-Cu-C-based alloy material containing Al and Ti according to claim 1, characterized in that, in step 1, the stearic acid lubricant is stearic acid or zinc stearate A sort of. 4. The preparation method of Fe-Cu-C-based alloy material containing Al and Ti according to claim 1, characterized in that, in step 4, the non-oxidizing protective atmosphere is a pure hydrogen atmosphere or a nitrogen-hydrogen mixed atmosphere. 5. The preparation method of Fe-Cu-C-based alloy material containing Al and Ti according to claim 4, characterized in that, in the nitrogen-hydrogen mixed atmosphere, the volume ratio of nitrogen to hydrogen is 10:90.

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