SU1624549A1 - Method for manufacture of contact plating of contacting parts of magnetically-controlled hermetically sealed contacts - Google Patents

Abstract

The invention relates to the manufacturing technology of anti-knit contacts. The purpose of the invention is to increase the contacts by stabilizing the magnitude of the transition resistance of the erosion process of the near-surface layers of contact parts made of magnetically soft material. Nitrogen ions with energies of 104–2–10 eV and a dose of electrophysical properties of the substrates are implanted into the contact parts made of magnetically soft material, limiting the diffusion of the substrate material into the contacting layer of an alloy based on noble metals. This prevents the formation of non-conductive films on the contacting surfaces. At the same time, the transient resistance value is stabilized, which allows to increase the reliability and increase the service life of the reed switches. Nitrogen-implanted substrates can be used in magnetically controlled contacts without the use of a contacting coating based on an alloy of noble metals, or with a coating whose thickness does not exceed 50% of the thickness commonly used in known technologies

Description

The invention relates to electrical engineering, in particular, to the technology of making magnetically controlled contacts.

The aim of the invention is to increase the reliability and increase the service life of magnetically controlled contacts (MC) by stabilizing the transient resistance and saving precious metals by slowing the erosion process of the near-surface layers of the substrates and contact details (CD) of a magnetically soft material.

The method is carried out as follows.

Pre-cleaned CDs from a magnet of a soft material are loaded into metal cassettes and placed in a vacuum.

the chamber pumped to a pressure of 10 Pa. The flow of high-energy ions is formed using an ion source of a cold cathode type douplasmatron connected to adjustable power sources, as a result of which the parameters of the ion beam can be easily monitored. The formed beam of nitrogen ions with an energy of 10 - 2 1 O4 eV irradiates the surface of a CD for 2–10 min. Since in the range of ion energy used, in addition to the implantation process, cathode sputtering takes place, which increases the degree of roughness of the CD surfaces, they are smoothed by ion etching. For this, the ion source

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switches to etch mode with conventional beam parameters. After ion treatment, CDs are covered with a layer of a contact coating made of an alloy based on noble metals with a thickness of about 10-50% of the conventional.

With this method of surface treatment of CDs, a positive effect is achieved, which is determined by the physical processes that occur when the magnet material treats the CD substrates with nitrogen ions with an energy of (1-2) 104 eV. The effect is to slow down the erosion process by limiting the diffusion of the substrate material to the surface of a contact coating made of an alloy based on noble metals, which prevents the formation of non-conductive films on it and the development of electroerosion.

In this case, the value of the transition resistance of the contact stabilizes.

The application of the proposed method provides significant savings in costly precious metals, increases reliability and increases the service life of the MK by slowing erosion after implantation of nitrogen ions into the CD substrate material, improving the MK control mode by reducing the magnetic gap thickness, precise adjustment of the physical process direction, as the beam parameters are known with a high degree of accuracy, and the ion spread over energy is in the order of tens of electron volts.

To assess the effectiveness of the proposed method, comparative tests were carried out on commercially available medium-capacity reed switches of the KEM-1 and MKA 27101 types. Contact coatings were deposited onto the reed switches by electroplating. The thickness of the AuNIRh MKA 27101 alloy coating was 2 µm.

Two batches of CEM-1 reed switches were tested, one of which was manufactured according to a known technology by the method of electrical engineering deposition, and the friend had

CD implanted with uncoated nitrogen ions. The tests were carried out in the following mode: U 30 V and I 1 A. In the test block there were 14 reed switches (7 of each type). As a result of the tests, 2 reed switches, made according to the known technology, failed after 2.5–105 and 1.55 -106 inclusions.

In addition, MCA 27101 reed switches were tested in the following modes: U 60 V, I 0.025 A; U 60 V, I 0.08 A; U 20 mV, I 10 μA, in a non-current mode.

The test results showed that the current modes are provided in the absence of contact coatings when irradiated with CD by nitrogen ions according to the proposed method. When working in microcurrent and currentless modes, in addition to ion implantation, it is necessary to apply a contact coating of traditional material with a thickness of 0.2 μm.

Thus, the tests carried out showed that the proposed method for the manufacture of CDs significantly increases the service life of reed switches while simultaneously reducing the consumption of precious metals.

Claims (1)

The invention The method of manufacturing the contact coating of contact parts of magnetically controlled sealed contacts by pre-cleaning the contact surface and ion treatment. So that, in order to increase reliability and increase the service life of mag contact control contacts by stabilizing the magnitude of the transition resistance and saving noble metals by slowing the erosion process of the near-surface layers of contact surfaces made of magnetically soft material, ion processing produced by implantation c. these substrates of nitrogen ions with energy 104-2104 eV and a dose of 1016-1018 cm.