A kind of method that prepares fe-al alloy with nanopowder

Abstract

The invention relates to a method for preparing Fe-Al alloy by using nano powder, belonging to the technical field of nano technology and powder metallurgy. The invention combines nanometer technology, plasma sintering technology and powder metallurgy technology. The invention proposes that the Fe-Al alloy obtained by the plasma sintering of the nanocomposite powder in a vacuum environment has fine grains, uniform structure and no second phase of large particles. This effectively solves the oxidation problem of the traditional smelting process of Fe-Al alloy and the growth problem of Fe3Al compound. The elongation rate of the Fe-Al alloy is improved, the ear-making rate is reduced, and the plate has excellent deep-drawing properties.

Description

technical field

[0001] The invention relates to a method for preparing Fe-Al alloy by using nano powder, belonging to the technical field of nano technology and powder metallurgy. Background technique

[0002] In 1861, with the establishment of colloid chemistry, scientists began to study the diameter of 1 ~ 100nm (1nm = 10 -9 m) Particle systems are studied. In 1963, Uyeda et al. used the gas condensation method to prepare metal nanoparticles, and studied its morphology and crystal structure with electron microscopy and diffraction. In the late 1970s, Drexler established a nanotechnology research group. In 1986, Glecter and others made a comprehensive report on the structure and properties of nanomaterials for the first time. In July 1990, the first nanotechnology conference was held in Baltimore, USA, marking the official birth of nanotechnology.

[0003] Due to special effects such as surface effects, small size effects, quantum size effects, and macroscopic quantum t...

Examples

Embodiment 1

[0025] Using mechanical ball milling method, the commercially available chemically pure iron powder and chemically pure aluminum powder are evenly mixed according to the mass ratio of 1:6, and then put into a stainless steel ball mill tank, protected by Ar gas, using stainless steel balls with a diameter of 3mm, and the ball powder ratio is 6:1, add a small amount of alcohol, use a high-energy ball mill at a speed of 200r / min, and ball mill for 10 hours;

[0026] Put the ball-milled powder into a mold and sinter on a vacuum discharge plasma sintering machine; during the sintering process, heat up to 900°C at a speed of 20°C / min, keep it warm for 20min, and apply a pressure of 300MPa at a vacuum of 3Pa, then cool to room temperature , DC pulse current intensity is 300A.

[0027] The performance test and phase analysis of the obtained Fe-Al alloy were carried out.

Embodiment 2

[0029] Using mechanical ball milling method, the commercially available chemically pure iron powder and chemically pure aluminum powder are evenly mixed according to the mass ratio of 1:6, and then put into a stainless steel ball mill tank, protected by Ar gas, using stainless steel balls with a diameter of 3mm, and the ball powder ratio is 10:1, add a small amount of alcohol, use a high-energy ball mill at a speed of 400r / min, and ball mill for 40 hours;

[0030] The ball-milled powder is put into a mold and sintered on a vacuum discharge plasma sintering machine; during the sintering process, the temperature is raised to 900°C at a speed of 20°C / min, and then kept for 20min with a vacuum of 5Pa and a pressure of 300MPa, and then cooled to room temperature , DC pulse current intensity is 300A.

[0031] The performance test and phase analysis of the obtained Fe-Al alloy were carried out.

Embodiment 3

[0033] Using mechanical ball milling method, the commercially available chemically pure iron powder and chemically pure aluminum powder are evenly mixed according to the mass ratio of 1:10, and then put into a stainless steel ball mill tank, protected by Ar gas, using stainless steel balls with a diameter of 3 mm, and the ball powder ratio is 10:1, add a small amount of alcohol, use a high-energy ball mill at a speed of 400r / min, and ball mill for 30 hours;

[0034] The ball-milled powder is put into a mold and sintered on a vacuum discharge plasma sintering machine; during the sintering process, the temperature is raised to 900°C at a speed of 20°C / min, and then kept for 20min with a vacuum of 3Pa and a pressure of 500MPa, and then cooled to room temperature , DC pulse current intensity is 300A.

[0035] The performance test and phase analysis of the obtained Fe-Al alloy were carried out.

technical field

[0001] The invention relates to a method for preparing Fe-Al alloy by using nano powder, belonging to the technical field of nano technology and powder metallurgy. Background technique

[0002] In 1861, with the establishment of colloid chemistry, scientists began to study the diameter of 1 ~ 100nm (1nm = 10 -9 m) Particle systems are studied. In 1963, Uyeda et al. used the gas condensation method to prepare metal nanoparticles, and studied its morphology and crystal structure with electron microscopy and diffraction. In the late 1970s, Drexler established a nanotechnology research group. In 1986, Glecter and others made a comprehensive report on the structure and properties of nanomaterials for the first time. In July 1990, the first nanotechnology conference was held in Baltimore, USA, marking the official birth of nanotechnology.

[0003] Due to special effects such as surface effects, small size effects, quantum size effects, and macroscopic quantum t...

Examples

Embodiment 1

[0025] Using mechanical ball milling method, the commercially available chemically pure iron powder and chemically pure aluminum powder are evenly mixed according to the mass ratio of 1:6, and then put into a stainless steel ball mill tank, protected by Ar gas, using stainless steel balls with a diameter of 3mm, and the ball powder ratio is 6:1, add a small amount of alcohol, use a high-energy ball mill at a speed of 200r / min, and ball mill for 10 hours;

[0026] Put the ball-milled powder into a mold and sinter on a vacuum discharge plasma sintering machine; during the sintering process, heat up to 900°C at a speed of 20°C / min, keep it warm for 20min, and apply a pressure of 300MPa at a vacuum of 3Pa, then cool to room temperature , DC pulse current intensity is 300A.

[0027] The performance test and phase analysis of the obtained Fe-Al alloy were carried out.

Embodiment 2

[0029] Using mechanical ball milling method, the commercially available chemically pure iron powder and chemically pure aluminum powder are evenly mixed according to the mass ratio of 1:6, and then put into a stainless steel ball mill tank, protected by Ar gas, using stainless steel balls with a diameter of 3mm, and the ball powder ratio is 10:1, add a small amount of alcohol, use a high-energy ball mill at a speed of 400r / min, and ball mill for 40 hours;

[0030] The ball-milled powder is put into a mold and sintered on a vacuum discharge plasma sintering machine; during the sintering process, the temperature is raised to 900°C at a speed of 20°C / min, and then kept for 20min with a vacuum of 5Pa and a pressure of 300MPa, and then cooled to room temperature , DC pulse current intensity is 300A.

[0031] The performance test and phase analysis of the obtained Fe-Al alloy were carried out.

Embodiment 3

[0033] Using mechanical ball milling method, the commercially available chemically pure iron powder and chemically pure aluminum powder are evenly mixed according to the mass ratio of 1:10, and then put into a stainless steel ball mill tank, protected by Ar gas, using stainless steel balls with a diameter of 3 mm, and the ball powder ratio is 10:1, add a small amount of alcohol, use a high-energy ball mill at a speed of 400r / min, and ball mill for 30 hours;

[0034] The ball-milled powder is put into a mold and sintered on a vacuum discharge plasma sintering machine; during the sintering process, the temperature is raised to 900°C at a speed of 20°C / min, and then kept for 20min with a vacuum of 3Pa and a pressure of 500MPa, and then cooled to room temperature , DC pulse current intensity is 300A.

[0035] The performance test and phase analysis of the obtained Fe-Al alloy were carried out.