Preparation method of pre-alloy powder of ferrum-aluminum intermetallic compound Fe2Al5
A pre-alloyed powder, fe2al5 technology, applied in the field of powder metallurgy, can solve the problems of coarse particle size and reduce the mechanical properties of materials, and achieve the effects of high brittleness, easy grinding and crushing, and stable thermodynamic properties
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Embodiment 1
[0019] Example 1: The carbonyl iron powder with a particle size of 60 μm and the analytically pure aluminum powder with a particle size of 100 μm were separated by Fe 2 Al 5 The mass percentage ingredients are mixed by ball milling and passed through a 100-mesh sieve to obtain a uniform mixed powder; the above mixed powder is placed in a cast iron container and spread to a thickness of 10mm, under a vacuum of 1-5Pa, at a speed of 10°C / min, Raise the temperature from room temperature to 450°C, then heat up to 640°C at a rate of 2°C / min, hold the temperature for 4 hours for sintering, and then cool naturally to obtain Fe 2 Al 5 Intermetallic pre-alloying; the Fe 2 Al 5 Intermetallic pre-alloy grinding, passing through a 325 mesh sieve to obtain iron-aluminum intermetallic compound Fe with a particle size of ≤40μm 2 Al 5 The pre-alloyed powder, its typical metallographic photo see figure 1 (The following examples are the same). Depend on figure 1 It can be seen that the i...
Embodiment 2
[0020] Example 2: the iron powder with a particle size of 10 μm and the aluminum powder with a particle size of 50 μm are pressed by Fe 2 Al 5 The mass percentage ingredients are mixed by ball milling and passed through a 200-mesh sieve to obtain a mixed powder; the above-mentioned mixed powder is placed in a cast iron container and spread to a thickness of 6mm. Under the protection of hydrogen, the temperature is raised from room temperature to 400 at a speed of 3°C / min ℃, then heated to 550℃ at a rate of 0.5℃ / min, held for 8 hours for sintering, and then cooled naturally to obtain Fe 2 Al 5 Intermetallic pre-alloying; the Fe 2 Al 5 Intermetallic pre-alloy grinding and passing through a 500-mesh sieve to obtain iron-aluminum intermetallic compound Fe with a particle size of ≤25 μm 2 Al 5 pre-alloyed powder.
Embodiment 3
[0021] Example 3: Analyzing the iron powder with a particle size of 30 μm and the pure aluminum powder with a particle size of 80 μm by Fe 2 Al 5 The mass percentage ingredients are mixed by ball milling and passed through a 100-mesh sieve to obtain a mixed powder; the above-mentioned mixed powder is placed in a cast iron container and spread to a thickness of 8 mm. Under the protection of argon, the temperature is raised from room temperature to 430°C, then heated to 600°C at a rate of 1°C / min, held for 6 hours for sintering, and then cooled naturally to obtain Fe 2 Al 5 Intermetallic pre-alloying; the Fe 2 Al 5 Intermetallic pre-alloy grinding and passing through 425 mesh sieve to obtain iron-aluminum intermetallic compound Fe with particle size ≤ 33 μm 2 Al 5 pre-alloyed powder.
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