Method for producing magnesium-based hydrogen-storing alloy and composite material by laser sintering

Abstract

Production of magnesium-base and hydrogen-storage alloy and composite material by laser sintering method is carried out by mixing elementary metal or hydrogen-storage alloy powders by ball mill, pressing mixed alloy biscuit, loading at 20-30MPa for 30 seconds, laser sintering by CO2 laser at 500-1600W, inducing into circulation water and cooling. The scanning speed ratio reaches to 100-120mm / min and diameter of light spot is 3-5mm. It's cheap, has less consumption, more yield and shorter sintering time, better performance.

Description

Technical field:

[0001] The invention belongs to the fields of laser technology, powder metallurgy technology and hydrogen storage technology, and in particular relates to a method for preparing magnesium-based hydrogen storage alloy and its composite material by laser sintering. Background technique:

[0002] With the world's energy crisis and environmental deterioration, hydrogen energy, as a new type of clean energy, has attracted more and more attention. Hydrogen storage materials, which are closely related to hydrogen energy technology, have attracted much attention from various countries. The composition design and phase design of hydrogen storage materials are directly related to their hydrogen storage performance. Different hydrogen storage alloy phases have different hydrogen storage, electrochemical, thermodynamic and other properties. In order to give full play to the comprehensive properties of various alloy phases, multi-element alloying is currently the main m...

Examples

Embodiment 1

[0019] Example 1: Metal Mg powder with a purity of 99.7% and a particle size of 200 mesh; Ni powder with a purity of 99.7% and a particle size of 200 mesh. A certain weight molar ratio is 1: 1 Mg powder (adding 5% burning loss for Mg powder) and Ni powder are put into stainless steel tank; The ratio of ball to material is 10:1); the evenly mixed powder is pressed in a stainless steel abrasive tool at 30MPa for 30 seconds and then pressed into a Φ13×3mm biscuit; the biscuit is placed in a graphite boat in the sintering chamber, and the 2 Laser for sintering. Among them, the laser power is 1000W, the scanning speed is 120mm / min, the spot diameter is 3mm, and the three-pass scanning is formed. The sintering time is about 8s. During the sintering process, it is cooled by circulating water; after laser sintering, it can quickly prepare high-purity Mg-Ni Elemental alloys, where Mg 2 Ni and MgNi 2 The content reaches more than 95wt.%.

Embodiment 2

[0020] Embodiment 2: metal Mg powder, purity 99.7%, particle size 200 orders; LaNi of smelting 5 The alloy was ground into a 300-mesh alloy powder in a glove box. Mg powder with a weight ratio of 4:1 (add 5% more burning loss to Mg powder) and LaNi 5The alloy powder is put into a stainless steel tank; the stainless steel tank is placed in a planetary ball mill for argon protection ball milling and mixed for 2 hours (the ratio of ball to material is 10:1); the evenly mixed powder is pressed in a stainless steel grinding tool at 30MPa for 30 seconds. into Φ13×3mm biscuit; put the biscuit into the graphite burning boat in the sintering chamber, and use CO 2 Laser for sintering. Among them, the laser power is 800W, the scanning speed is 120mm / min, the spot diameter is 5mm, and the three-pass scanning is formed. The sintering time is about 6s. During the sintering process, it is cooled by circulating water; after laser sintering, it can quickly prepare high-purity La-Mg- Ni comp...

Embodiment 3

[0021] Embodiment 3: electromagnetic smelting or direct purchase of Mg 2 Ni and LaNi 5 The alloy was ground into a 100-mesh alloy powder in a glove box. LaNi with a weight ratio of 9:1 to 7:3 5 and Mg 2 Put the Ni alloy powder into a stainless steel tank; put the stainless steel tank in a planetary ball mill for argon protection ball milling and mix for 2 hours (the ratio of ball to material is 10:1); after the uniformly mixed powder is kept in a stainless steel grinding tool at 20MPa for 30 seconds, Pressed into Φ13×3mm biscuit; put the biscuit into the graphite burning boat in the sintering chamber, and use CO 2 Laser for sintering. Among them, the laser power is 500W, the scanning speed is 120mm / min, the spot diameter is 3mm, three-way scanning molding, the sintering time is 10s, and the sintering process is cooled by circulating water; after laser sintering, it can quickly prepare high-purity La-Mg-Ni Ternary alloy composite materials, in which the composite materials...

Technical field:

[0001] The invention belongs to the fields of laser technology, powder metallurgy technology and hydrogen storage technology, and in particular relates to a method for preparing magnesium-based hydrogen storage alloy and its composite material by laser sintering. Background technique:

[0002] With the world's energy crisis and environmental deterioration, hydrogen energy, as a new type of clean energy, has attracted more and more attention. Hydrogen storage materials, which are closely related to hydrogen energy technology, have attracted much attention from various countries. The composition design and phase design of hydrogen storage materials are directly related to their hydrogen storage performance. Different hydrogen storage alloy phases have different hydrogen storage, electrochemical, thermodynamic and other properties. In order to give full play to the comprehensive properties of various alloy phases, multi-element alloying is currently the main m...

Examples

Embodiment 1

[0019] Example 1: Metal Mg powder with a purity of 99.7% and a particle size of 200 mesh; Ni powder with a purity of 99.7% and a particle size of 200 mesh. A certain weight molar ratio is 1: 1 Mg powder (adding 5% burning loss for Mg powder) and Ni powder are put into stainless steel tank; The ratio of ball to material is 10:1); the evenly mixed powder is pressed in a stainless steel abrasive tool at 30MPa for 30 seconds and then pressed into a Φ13×3mm biscuit; the biscuit is placed in a graphite boat in the sintering chamber, and the 2 Laser for sintering. Among them, the laser power is 1000W, the scanning speed is 120mm / min, the spot diameter is 3mm, and the three-pass scanning is formed. The sintering time is about 8s. During the sintering process, it is cooled by circulating water; after laser sintering, it can quickly prepare high-purity Mg-Ni Elemental alloys, where Mg 2 Ni and MgNi 2 The content reaches more than 95wt.%.

Embodiment 2

[0020] Embodiment 2: metal Mg powder, purity 99.7%, particle size 200 orders; LaNi of smelting 5 The alloy was ground into a 300-mesh alloy powder in a glove box. Mg powder with a weight ratio of 4:1 (add 5% more burning loss to Mg powder) and LaNi 5The alloy powder is put into a stainless steel tank; the stainless steel tank is placed in a planetary ball mill for argon protection ball milling and mixed for 2 hours (the ratio of ball to material is 10:1); the evenly mixed powder is pressed in a stainless steel grinding tool at 30MPa for 30 seconds. into Φ13×3mm biscuit; put the biscuit into the graphite burning boat in the sintering chamber, and use CO 2 Laser for sintering. Among them, the laser power is 800W, the scanning speed is 120mm / min, the spot diameter is 5mm, and the three-pass scanning is formed. The sintering time is about 6s. During the sintering process, it is cooled by circulating water; after laser sintering, it can quickly prepare high-purity La-Mg- Ni comp...

Embodiment 3

[0021] Embodiment 3: electromagnetic smelting or direct purchase of Mg 2 Ni and LaNi 5 The alloy was ground into a 100-mesh alloy powder in a glove box. LaNi with a weight ratio of 9:1 to 7:3 5 and Mg 2 Put the Ni alloy powder into a stainless steel tank; put the stainless steel tank in a planetary ball mill for argon protection ball milling and mix for 2 hours (the ratio of ball to material is 10:1); after the uniformly mixed powder is kept in a stainless steel grinding tool at 20MPa for 30 seconds, Pressed into Φ13×3mm biscuit; put the biscuit into the graphite burning boat in the sintering chamber, and use CO 2 Laser for sintering. Among them, the laser power is 500W, the scanning speed is 120mm / min, the spot diameter is 3mm, three-way scanning molding, the sintering time is 10s, and the sintering process is cooled by circulating water; after laser sintering, it can quickly prepare high-purity La-Mg-Ni Ternary alloy composite materials, in which the composite materials...

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