What factors affect the degree of wear of contacts in electronic devices?

1, the contact in the work of the way to produce wear mainly depends on the shape of the contact itself, and different contact shape in different degrees affects the size of the contact wear.

2,the degree of surface finish of the contact is a direct factor affecting the wear, because the contact surface unevenness not only cause wear, but also wear and corrosion in the process of excess particles will be gathered in the contact surface of the depression, to the cleanliness of the contact surface, contact accelerated wear and current-carrying capacity to bring a certain degree of potential danger.

3,Different contact materials have different wear characteristics. As different metal materials wear resistance, rust and oxidation resistance to a certain degree of difference, so the material of the contact is not only related to the performance and cost of electronic devices, but also directly affect the service life of electronic devices. When two different metal materials as contacts contact each other, the surface of the lubrication and wear problem is more important, this is because of the two mutual contact surface hardness asymmetry caused by the high hardness of the contact surface excessive wear low hardness contact surface, so that the premature failure of electrical components and affect the reliability of the control system, for the use of plating processing of contact surfaces, due to the surface of the plating layer is prone to produce the phenomenon of stripping ( Plating layer is more likely to produce peeling phenomenon than chemical plating), the peeling of the surface plating will make the surface contact resistance and excess of the sudden change, thus exacerbating the wear and tear of the surface and the temperature rise, until the failure of the electrical components.

4, any contact surface there is a certain contact resistance, a certain contact resistance is bound to consume a certain amount of power, so that the surface of the contact to produce a certain temperature rise, contacts in a changing temperature field, due to the physical properties of the metal material itself thermal expansion and contraction of the contact surface to produce thermal vibration abrasion, this thermal abrasion phenomenon will be with the pair of contact material thermal expansion and contraction characteristics of the difference between the increase and enhancement of This thermal wear phenomenon will increase as the difference in the thermal expansion and contraction properties of the paired contact materials increases, and also causes an increase in the relative movement between the two contacts. Based on the same thermal wear mechanism, a change in temperature can cause a change in the degree of contact looseness or tightness depending on the difference in the coefficients of thermal expansion of the two materials. When the contact becomes loose due to temperature changes, the contact resistance increases and intensifies the heat, with the contact gap increases so that the contact surface is more susceptible to contamination, when the contact becomes tight, any relative displacement between the surface of each contact will aggravate the surface wear.

5, contact pressure (contact dynamic and static pressure): usually, mechanical wear is proportional to the contact pressure, in the electrical contact system, in order to achieve the purpose of reducing contact resistance and improve contact reliability, one of the important means is to improve the contact pressure, therefore, the existence of wear between the contacts will be unavoidable.

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