A titanium-based hydrogen storage device with a heater

Abstract

The present invention relates to a titanium-based hydrogen storage device with a heater, comprising a heater and a hydrogen storage metal; the heater comprises a metal heating wire and a ceramic insulating tube, the ceramic insulating tube is sleeved on the surface of the metal heating wire, and the hydrogen storage metal is located on the surface of the ceramic insulating tube. Advantages: 1) Simple structure, high firmness, small size, suitable for the development of miniaturization and planarization of electronic devices with hydrogen storage requirements. 2) With a heater, the amount of hydrogen absorbed and released by the device can be accurately adjusted by fine-tuning the current.

Description

Technical Field

[0001] The invention discloses a titanium-based hydrogen storage device with a heater, belonging to the field of electronic component manufacturing. Background Art

[0002] Hydrogen storage devices are electronic devices with special uses in the electronics industry. Their main function is to store hydrogen (gas). They are usually stored in a closed cavity (such as a closed shell of an electron tube) to absorb, store or release hydrogen according to the specific requirements of the environment.

[0003] Since hydrogen can be reversibly absorbed in metals such as titanium and nickel, most hydrogen storage materials are made of titanium and nickel alloys. The technical difficulties of hydrogen storage devices are: a. After metals absorb hydrogen, they are prone to hydrogen embrittlement, resulting in a sharp decrease in the strength of the device; b. The conditions for hydrogen storage devices to absorb and release hydrogen are difficult to control.

[0004] The main application scenarios of traditional hydrogen storage devices are high-density storage and transportation of hydrogen, such as hydrogen storage in hydrogen energy vehicles, etc. Its characteristics are high hydrogen storage density, low activation temperature, strong anti-poisoning ability, low cost, fast hydrogen absorption speed, safety and reliability. These hydrogen storage devices are generally large in size, ranging from tens of liters to hundreds of cubic meters.

[0005] In the use scenario for small and medium-sized electronic devices, the main feature is to accurately control the amount of hydrogen absorbed and released. The requirements for hydrogen storage devices in this application scenario are different from those in traditional application scenarios. It usually requires that the hydrogen storage material is small in size, the closed cavity of the hydrogen storage device reaches a high vacuum after hydrogen absorption, the absorption and release of hydrogen are precisely controllable, and the released hydrogen is of high purity. At the same time, the device is required to be highly firm and not to fall off after repeated absorption and release of hydrogen. Summary of the invention

[0006] The present invention proposes a titanium-based hydrogen storage device with a heater, which aims to solve the problem that when hydrogen storage materials are used in small electronic components, the hydrogen embrittlement resistance is easily reduced after repeated hydrogen absorption, and the problem of precise control of hydrogen absorption and release of hydrogen storage materials.

[0007] The technical solution of the present invention:

[0008] A titanium-based hydrogen storage device with a heater comprises a heater and a hydrogen storage metal; the heater comprises a metal heating wire and a ceramic insulating tube, the ceramic insulating tube is sleeved on the surface of the metal heating wire, and the hydrogen storage metal is located on the surface of the ceramic insulating tube.

[0009] The diameter of the metal heating wire in the heater is 0.1-1.0 mm; the ceramic insulating tube is alumina ceramic, with an inner diameter of 0.1-1.1 mm and a wall thickness of 0.2-0.8 mm.

[0010] The hydrogen storage metal is an elliptical cylinder with an elliptical cross section, a short axis of 1.5-4 mm, a long axis of 2-6 mm, and a height of 3-10 mm.

[0011] The metal heating wire is made of molybdenum, tungsten, rhenium, or an alloy of two or three thereof.

[0012] The hydrogen storage metal is titanium or titanium alloy.

[0013] The titanium alloy includes titanium and auxiliary components, the titanium content is greater than or equal to 70%, the auxiliary components include one or more of molybdenum, vanadium, manganese, iron, and rare earth, and the titanium and the auxiliary components are processed into an elliptical cylinder by a powder metallurgy method.

[0014] Beneficial effects of the present invention:

[0015] 1) It has a simple structure, high firmness and small size, which can meet the needs of miniaturization and planarization of electronic devices with hydrogen storage requirements.

[0016] 2) With a heater, the amount of hydrogen absorbed and released by the device can be precisely adjusted by fine-tuning the current. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 It is a schematic structural diagram of a titanium-based hydrogen storage device with a heater according to the present invention.

[0018] In the figure, 1 is the heater heating wire, 2 is the heater insulating ceramic, and 3 is the hydrogen storage metal. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further explained below in conjunction with the accompanying drawings.

[0020] Compare with Figure 1 , a titanium-based hydrogen storage device with a heater, characterized in that it includes a heater and a hydrogen storage metal; wherein the hydrogen storage metal is located on the surface of the heater.

[0021] The hydrogen storage metal is pure titanium or alloyed with auxiliary components, wherein titanium accounts for more than 70%, and the auxiliary components are one or more of molybdenum, vanadium, manganese, iron, and rare earth. The powders of the above components are uniformly mixed.

[0022] The heater of the hydrogen storage device is composed of a metal heating wire and a ceramic insulating tube, and the ceramic insulating tube is sleeved on the surface of the metal heating wire; the metal heating wire is made of molybdenum, tungsten, rhenium and other metals or their alloys, with a wire diameter of 0.1-1.0mm, and the ceramic insulating tube is sleeved on the surface of the metal heating wire, with an inner diameter of 0.1-1.1mm and a wall thickness of 0.2-0.8mm.

[0023] The ceramic insulating tube is made of alumina ceramic, and its inner diameter matches the electric heating wire. The electric heating wire is slightly bent and inserted into the ceramic tube, and a small amount of brazing material is filled in. The resistance wire is heated in a vacuum to melt the brazing material, and the electric heating wire and the ceramic insulating tube are fixed to form a heater.

[0024] The heater and the hydrogen storage metal mixed powder are filled into the mold with the elliptical cylindrical space and pressed lightly. The pressed mold is placed in a vacuum sintering furnace for powder metallurgy sintering to form the heater and the getter alloy into a whole. After molding, the floating powder is removed to prevent the short circuit between the heating wire and the hydrogen storage powder. The cross section of the sintered hydrogen storage device is elliptical, with a short axis of 1.5-4mm, a long axis of 2-6mm, and an elliptical cylinder height of 3-10mm.

[0025] Example 1

[0026] Example 2 A molybdenum wire with a diameter of 0.2 mm and a length of 10 mm is used as the electric heating wire, and an alumina ceramic tube with an outer diameter of 0.75 and an inner diameter of 0.25 is used as the insulating layer. The molybdenum wire is slightly bent, then inserted into the porcelain tube, and a trace amount of brazing material is filled in. The molybdenum wire is heated by electricity in a vacuum to melt the brazing material. After cooling, the molybdenum wire and the porcelain tube are fixed together to form a heater.

[0027] Titanium powder, molybdenum powder and rare earth powder are mixed in a ratio of 90%:5%:5% to prepare hydrogen storage alloy powder.

[0028] The alloy powder and the heater are loaded into an elliptical cylindrical mold. The mold filled with powder is vacuum sintered in a vacuum furnace. After sintering, the blank is taken out of the mold and trimmed to keep the metal powder and the heating wire insulated to obtain the finished product. The finished product is 4mm high and has an elliptical cross section with a major axis of 3.5mm and a minor axis of 1.5mm.

[0029] This product is used in a certain type of electron tube that needs hydrogen storage. The volume of the electron tube is 200ml. The two ends of the hydrogen storage material are welded to the electrodes inside the electron tube. The electrodes and the electron tube are vacuum sealed, and power can be supplied from the power supply outside the electron tube.

[0030] The electron tube is equipped with two pressure (vacuum) gauges with different ranges to test the hydrogen pressure in the tube, ranging from 1E-4 Pa to 1E5 Pa. The electron tube has been evacuated to a vacuum of 1E-4 Pa and completely exhausted before being filled with hydrogen.

[0031] The hydrogen storage device was activated by applying a 5.5A current for 20 minutes, and then filled with 0.001mol of hydrogen, and then the electron tube was sealed. After 10 minutes, the hydrogen storage device completely absorbed the hydrogen, and the pressure in the electron tube dropped to 1E-2Pa, and continued to drop slowly. The hydrogen storage device was powered on and heated to release and absorb hydrogen. As the current slowly increased from 0 to 7.5A, the pressure in the tube gradually increased from 1E-2Pa to 18KPa. After the power was turned off, the pressure in the tube dropped below 1E-2Pa again, and the pressure in the tube was always positively correlated with the heating current. The hydrogen storage device was repeatedly absorbed and released hydrogen 20 times according to the above steps, and no cracking or particle shedding was observed.

Claims

1. A titanium-based hydrogen storage device with a heater, characterized in that It includes a heater and a hydrogen storage metal; the heater is composed of a metal heating wire and a ceramic insulating tube, the ceramic insulating tube is sleeved on the surface of the metal heating wire, and the hydrogen storage metal is located on the surface of the ceramic insulating tube; The diameter of the metal heating wire in the heater is 0.1-1.0mm; the ceramic insulating tube is alumina ceramic, with an inner diameter of 0.1-1.1mm and a wall thickness of 0.2-0.8mm; The hydrogen storage metal is an elliptical cylinder, and its cross section is elliptical, with a short axis of 1.5-4 mm, a long axis of 2-6 mm, and a height of 3-10 mm. The metal heating wire is made of molybdenum, tungsten, rhenium or an alloy of two or three thereof; The hydrogen storage metal is titanium or titanium alloy; The titanium alloy includes titanium and auxiliary components, the titanium content is greater than or equal to 70%, the auxiliary components include one or more of molybdenum, vanadium, manganese, iron, and rare earth, and the titanium and the auxiliary components are processed into an elliptical cylinder by a powder metallurgy method.

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