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Ni-Re-Ir mixed sponge oxide cathode

An oxide cathode, rhenium iridium technology, applied in the field of electric vacuum, can solve the problems of the end of cathode life and the reduction of cathode activity, and achieve the effect of prolonging the life of the cathode and enhancing the activity

Inactive Publication Date: 2010-08-04
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the cathode works for a period of time, due to the increase in the resistance of the intermediate layer, the cathode activity will gradually decrease, resulting in the end of the cathode life.

Method used

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Embodiment Construction

[0013] Preparation method of the present invention, its main steps are:

[0014] a) firstly, Ni powder, Re powder and Ir powder with a purity of 99.9wt% and an average particle size of 30 μm-40 μm are mixed by mass percentage 70-80%: 5-20%: 5-20% and put into an agate grinding bowl;

[0015] b) above-mentioned mixed powder is ground in agate bowl more than 2 hours, guarantees that three kinds of powders mix evenly;

[0016] c) Spray a layer of nitrocellulose solution on the cathode Ni substrate (containing a small amount of activators such as Mg and W), and sieve a layer of Ni, Re, and Ir metal powder mixed with a 325-mesh sieve, and dry it to form Ni-Re - Ir sponge layer, the thickness of the sponge layer is 100 μm-200 μm;

[0017] d) Put the above-mentioned cathode substrate with Ni-Re-Ir sponge layer into H 2 Carry out sintering in the furnace, the sintering temperature is 1250±10°C, and the time is 15 minutes.

[0018] e) Fill the Ni-Re-Ir sponge layer prepared above wi...

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Abstract

The invention discloses a method for preparing a Ni-Re-Ir mixed sponge oxide cathode, comprising the following steps: grinding and mixing Ni powder, Re powder and Ir powder in percentage by weight of 70-80%: 5-20%: 5-20% to prepare Ni, Re and Ir metal powder; spraying one layer of binding element on the cathode Ni substrate; coating the Ni, Re and Ir metal powder on the binding element to form an Ni, Re and Ir sponge layer; after drying, removing the dusting flour of the Ni, Re and Ir metal powder; putting the cathode Ni substrate stuck with the Ni, Re and Ir sponge layer into an H2 furnace to be sintered for 10-20 minutes at the temperature of 1250+ / -10 DEG C; after filling triple carbonate in the Ni, Re and Ir sponge layer, spraying a layer of the triple carbonate on the surface of the Ni, Re and Ir sponge layer to prepare the Ni-Re-Ir mixed sponge oxide cathode. The invention improves the emission current density of the Ni-Re-Ir sponge oxide cathode, strengthens the cathode activity and prolongs the cathode service life.

Description

technical field [0001] The invention belongs to the electric vacuum technology, and in particular relates to preparing a Ni sponge oxide cathode by using Ni, Re, and Ir mixed powder sponge, so as to improve the emission current density of the Ni sponge oxide cathode, enhance the cathode activity, and prolong the life of the cathode. Background technique [0002] Oxide cathode is one of the most widely used hot cathodes in electric vacuum devices. In the development of oxide cathodes, in order to enhance the mechanical strength of the cathode and the bonding between the cathode surface oxide and the base metal, a Ni sponge layer with a thickness of less than 400 μm is generally sintered on the surface of the cathode base metal. This kind of porous Ni sponge layer can not only increase the reserve of emission materials but also shorten the path of current passing in the oxide coating, so the Ni sponge oxide cathode can draw a larger emission current density than the ordinary o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J9/04H01J1/14
Inventor 王小霞廖显恒赵青兰王其富
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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