Method for preparing MgB2 coating on stainless steel base

Abstract

The invention belongs to the technical field of superconducting materials, and particularly relates to a method for preparing a MgB2 coating on a stainless steel base. Firstly, MgB2 powder is prepared through a sintering method, stainless steel serves as a cathode, a pure Ni sheet serves as an anode, a MgB2 preliminary coating is obtained through electro-deposition, and the MgB2 coating is prepared after the MgB2 preliminary coating is thermally treated. The MgB2 coating prepared through the direct deposition method is high in purity, later thermal treatment temperature is low, and the room temperature metal conductivity is achieved. The advantages of being simple, quick and low in cost are achieved, and high economic and social significance is achieved.

Description

technical field

[0001] The invention belongs to the technical field of superconducting materials, in particular to a method for preparing MgB on a stainless steel substrate 2 Coating method. Background technique

[0002] MgB with a critical transition temperature of 39K 2 Due to the advantages of high transition temperature, large coherence length, high upper critical field, no weak connection at grain boundaries, simple structure and low cost, superconductors have great potential to replace the traditional first-order in the near future. A class of superconductors. MgB 2 Made into film or wire, it can be widely used in making CT scanners, components of supercomputers and components of power transmission equipment, etc., and has very broad application prospects.

[0003] At present, many deposition techniques are used to prepare high-quality MgB 2 Coatings such as PLD (Pulsed Laser Deposition), Chemical Vapor Deposition (CVD), Magnetron Sputtering, etc. In order to obt...

Examples

Embodiment 1

[0038] Step 1 Preparation of MgB by sintering method 2 powder:

[0039] Use pure boron powder and pure magnesium powder as raw materials, control the atomic ratio of Mg and B in the raw materials to 1: 2, mix them evenly in an agate mortar, press them into thin slices with a diameter of 3cm at 8MPa, and sinter at a constant temperature of 500°C 3h, Ar-4%H was introduced during the sintering process 2 Gas provides a reducing atmosphere, and the sintered product is cooled and ground into powder to obtain MgB 2 powder, its XRD pattern is as figure 1 as shown,

[0040] From figure 1 It can be seen in powdered MgB 2 High purity, containing only a very small amount of magnesium oxide and unknown impurities;

[0041] Step 2 Pretreatment of stainless steel substrate:

[0042]Clean the stainless steel substrate ultrasonically for 40 minutes with a cleaning agent, finally wash it with deionized water, and dry it for later use;

[0043] Step 3. Deposition of MgB in methanol-iodin...

Embodiment 2

[0051] Step 1 Preparation of MgB by sintering method 2 powder:

[0052] Use pure boron powder and pure magnesium powder as raw materials, control the atomic ratio of Mg and B in the raw materials to 1: 2, mix them evenly in an agate mortar, press them into thin slices with a diameter of 2.5cm at 12MPa, and keep the temperature at 800°C Sintering for 2 hours, Ar-4%H was introduced during the sintering process 2 Gas provides a reducing atmosphere, and the sintered product is cooled and ground into powder to obtain MgB 2 powder;

[0053] Step 2 Pretreatment of stainless steel substrate:

[0054] Clean the stainless steel substrate ultrasonically for 10 minutes with a cleaning agent, finally wash it with deionized water, and dry it for later use;

[0055] Step 3. Deposition of MgB in methanol-iodine electrophoresis system 2 coating:

[0056] 3.1 Preparation of electrophoretic suspension:

[0057] Add 0.15g MgB in 50mL methanol 2 powder, 0.001g iodine pellets to make methan...

Embodiment 3

[0063] Step 1 Preparation of MgB by sintering method 2 powder:

[0064] Use pure boron powder and pure magnesium powder as raw materials, control the atomic ratio of Mg and B in the raw materials to 1: 2, mix them evenly in an agate mortar, press them into thin slices with a diameter of 2cm at 10MPa, and sinter at a constant temperature of 600°C 1.5h, Ar-4%H was introduced during the sintering process 2 Gas provides a reducing atmosphere, and the sintered product is cooled and ground into powder to obtain MgB 2 powder;

[0065] Step 2 Pretreatment of stainless steel substrate:

[0066] Clean the stainless steel substrate ultrasonically for 20 minutes with a cleaning agent, finally wash it with deionized water, and dry it for later use;

[0067] Step 3. Deposition of MgB in methanol-iodine electrophoresis system 2 coating:

[0068] 3.1 Preparation of electrophoretic suspension:

[0069] Add 0.2g MgB in 60mL methanol 2 Powder, 0.025g iodine grains are made into methanol-...

technical field

[0001] The invention belongs to the technical field of superconducting materials, in particular to a method for preparing MgB on a stainless steel substrate 2 Coating method. Background technique

[0002] MgB with a critical transition temperature of 39K 2 Due to the advantages of high transition temperature, large coherence length, high upper critical field, no weak connection at grain boundaries, simple structure and low cost, superconductors have great potential to replace the traditional first-order in the near future. A class of superconductors. MgB 2 Made into film or wire, it can be widely used in making CT scanners, components of supercomputers and components of power transmission equipment, etc., and has very broad application prospects.

[0003] At present, many deposition techniques are used to prepare high-quality MgB 2 Coatings such as PLD (Pulsed Laser Deposition), Chemical Vapor Deposition (CVD), Magnetron Sputtering, etc. In order to obt...

Examples

Embodiment 1

[0038] Step 1 Preparation of MgB by sintering method 2 powder:

[0039] Use pure boron powder and pure magnesium powder as raw materials, control the atomic ratio of Mg and B in the raw materials to 1: 2, mix them evenly in an agate mortar, press them into thin slices with a diameter of 3cm at 8MPa, and sinter at a constant temperature of 500°C 3h, Ar-4%H was introduced during the sintering process 2 Gas provides a reducing atmosphere, and the sintered product is cooled and ground into powder to obtain MgB 2 powder, its XRD pattern is as figure 1 as shown,

[0040] From figure 1 It can be seen in powdered MgB 2 High purity, containing only a very small amount of magnesium oxide and unknown impurities;

[0041] Step 2 Pretreatment of stainless steel substrate:

[0042]Clean the stainless steel substrate ultrasonically for 40 minutes with a cleaning agent, finally wash it with deionized water, and dry it for later use;

[0043] Step 3. Deposition of MgB in methanol-iodin...

Embodiment 2

[0051] Step 1 Preparation of MgB by sintering method 2 powder:

[0052] Use pure boron powder and pure magnesium powder as raw materials, control the atomic ratio of Mg and B in the raw materials to 1: 2, mix them evenly in an agate mortar, press them into thin slices with a diameter of 2.5cm at 12MPa, and keep the temperature at 800°C Sintering for 2 hours, Ar-4%H was introduced during the sintering process 2 Gas provides a reducing atmosphere, and the sintered product is cooled and ground into powder to obtain MgB 2 powder;

[0053] Step 2 Pretreatment of stainless steel substrate:

[0054] Clean the stainless steel substrate ultrasonically for 10 minutes with a cleaning agent, finally wash it with deionized water, and dry it for later use;

[0055] Step 3. Deposition of MgB in methanol-iodine electrophoresis system 2 coating:

[0056] 3.1 Preparation of electrophoretic suspension:

[0057] Add 0.15g MgB in 50mL methanol 2 powder, 0.001g iodine pellets to make methan...

Embodiment 3

[0063] Step 1 Preparation of MgB by sintering method 2 powder:

[0064] Use pure boron powder and pure magnesium powder as raw materials, control the atomic ratio of Mg and B in the raw materials to 1: 2, mix them evenly in an agate mortar, press them into thin slices with a diameter of 2cm at 10MPa, and sinter at a constant temperature of 600°C 1.5h, Ar-4%H was introduced during the sintering process 2 Gas provides a reducing atmosphere, and the sintered product is cooled and ground into powder to obtain MgB 2 powder;

[0065] Step 2 Pretreatment of stainless steel substrate:

[0066] Clean the stainless steel substrate ultrasonically for 20 minutes with a cleaning agent, finally wash it with deionized water, and dry it for later use;

[0067] Step 3. Deposition of MgB in methanol-iodine electrophoresis system 2 coating:

[0068] 3.1 Preparation of electrophoretic suspension:

[0069] Add 0.2g MgB in 60mL methanol 2 Powder, 0.025g iodine grains are made into methanol-...

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