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Home Aerospace & Aeronautics Smart materials for mobile units of space vehicle

Smart materials for mobile units of space vehicle

Description

Two classes of materials for mobile units of space vehicles are offered. Wear-resistant materials on the titan-basis with elements of self-organization are intended for gearings used in the control systems of supervision devices over the Earth and planets, and also solar batteries and Planetokhod. Antifrictional self-lubricating composite materials on the copper-basis have low friction factors in vacuum and provide necessary operational reliability and durability of sliding bearings working at influence of space factors.

Under the conditions of space vacuum, the mechanisms that ensure wear resistance of materials under friction do not take place, because of absence of the gas environment. At dry friction in vacuum the plastic strain accumulates and rapid seizing processes occur.

The problem of creation materials for sliding bearings working in vacuum and ensure minimum losses for friction could be solved through the designing of self-lubricating composites containing the sufficient amount of solid lubricant within their structure which provides creation of protective shielding films on friction surfaces. In the course of development of these materials, a special attention should be paid to comprehensive study of the contact zone within which the protective films can form as a result of tribosynthesis. During deterioration of a working surface the protective film is constantly recycled as a result of continuous receipt in a contact zone of new volumes of solid lubricant.

Wear-resistant materials with elements of self-organization of structure during friction are offered for gearings. Introduction of MexSey chalcogenid compounds in a high-strength titanic alloy is a necessary condition of self-organizing of a material during which are formed the dissipative structures disseminating external energy streams. As formation of the dissipative structures with dynamic character of stability basically occurs in zones of the material’s structure defects, arising at friction it is possible to explain significant decrease of its deterioration by curing of these defects.

Innovative Aspect and Main Advantages

For sliding bearings, we offer the antifrictional self-lubricating material on the copper basis having the heterogeneous structure, containing solid structural components and sufficient amount of solid lubricant.

Such a material has been tested in the Austrian Center of Aerospace Materials Science and Technologies under vacuum conditions with load variation in the 2-10 N range. This material has the friction coefficient value in the 0.12-0.15 range. The wear rate is less by a factor of 2 to 3 compared with the best material LB9 (Glacier, copperbased alloy with additions of Ni, Sn, Zn and Pb) used currently.

At tests under vacuum it has been established that intensity of deterioration for pair friction «SCAM IPM-305 disk - ШХ15 steel spherical indenter» practically does not depend on temperature and makes ~1.0*10-1 g/km.

The frictional behavior of friction pair is characterized by stability. Average values of friction factors are equal 0.13 at temperature plus 20оС and 0.18 at temperature a minus 153оС.

One of the ways extending of work resource for space vehicles in an orbit up to 10-15 years is application of a wear resistant high-strength alloy on the α-titan basis with elements of self-organization for gearings used in control systems of space mechanisms.

Areas of Application

Space mechanisms: gearings and sliding bearings used in the control systems of supervision devices over the Earth and planets, and also solar batteries and Plane-tokhods.

High-loaded mechanisms working in conditions of dry or semidry friction at multicyclic loads.


Fig. 1 The lower bush of the steering connection.

Stage of Development

It is accessible to demonstration. The material specimens and inserts for trolleybus steering rod are made and tested. The patent of Ukraine is received on the composite antifrictional self-lubrication material on the copper-basis.

Contact Details

Frantsevich Institute for Problems of Materials Science of the National Academy of Science of Ukraine (IPMS of NASU)
Contact persons: Kostornov Anatoly, Frolov Gennady
3, Krzhizhanovski Street, Kiev-142, 03680, Ukraine
Tel.: +380(44) 424-0492
Fax: +380(44) 424-2131
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it ; This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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