Contract 166 (304) - completed - MATNANTECH Program
NEW MATERIALS FOR SURFACE REQUIREMENTS AND COVERAGE OF THE OSCILANTS IN THE RADIAL COMPONENTS COMPONENTS
Partners:
The purpose of the project is the creation of "New materials for the realization and coating of swaths"
High Speed Radial Bearings (LRTR) have three normal operating modes: the initial one in which the speed progressively increases, the steady-state operation at nominal and stopping speeds, in which the speed decreases. This is important because it determines distinct modes of operation, where various problems can arise that can be highlighted on the LRTR test and diagnosis system.
The optimal design for the high-speed radial rolls² to be fitted to the turbomachines is that of the oscillating clutches². The main bearings characteristics (load force, instantaneous temperature friction, minimum thickness of the lubricant film, etc.) are given, in the case of good mechanical processing, by the characteristics of the material from which the bearing is made or the oscillating swaths.
Materials for oscillating swabs have to meet some difficult and sometimes contradictory requirements, the high level of thermal and mechanical stress being the first element to be considered.
The bearings we occupy in the project are demanded and dynamic, subject to strong tiredness.
The stressing complex to which the oscillating shoe material is subjected can be summed up:
mechanical stresses = contact pressure, fatigue, exaggerated loads
Thermal stress = friction in the bearing and heat generated by combustion processes
chemical attacks = thanks to the lubricant
wear effects = due to relative bearing surface movement
the effects of foreign particles and contaminants.
electrostatic charges
exposure to radiation
In our country, the use of various types of bronze or copper-based alloys is currently used to make oscillating swabs, these alloys do not respond satisfactorily to the above-mentioned demands that the bearings can not record high performances.
INCDT COMOTI, experienced in turbomachinery construction, tested various types of alloys and decided to develop and approve in this project a new, advanced, complex, copper based alloy with specially controlled, strictly controlled additions made under conditions outstanding development.
To meet all demands, INOE has developed and tested new coating material and application technology that greatly improves bearing properties.
The field of application, namely the deposition of layers with thermo mechanical, wear and corrosion properties, with simultaneous and superior lubricating properties, belongs to the category of the latest time domains meant to implement new, low-energy, high-efficiency low-energy technologies , to give the resulting composite system, base material - deposited layer, outstanding properties. The active medium - plasma, in which the synthesis reactions of the layer material are carried out, is the way to initiate reactions that can not be carried out in equilibrium conditions, hence the possibility of synthesis of materials that can not be obtained by classical processes . The choice of filler material has taken into account compatibility with the substrate with certain lubricating qualities.
Within the project, different types of substrates (In-Sn and Ag) were deposited on the substrate (Cu-alloy base alloy), determining the composition and characteristics of the layer with the best properties.
Within the project, cams have been tested and approved under static regime, according to a technology and a stand (stand) made in the project as well.
The project was completed with the homologation of the bearings under normal operating conditions, ie in production, carried out on air-powered turbine engines and turbomachines that carry methane gas.
Project Location:
Test stand - INCDT COMOTI Bucharest
High Speed Radial Bearings:
at the S.P.Ticleni turbocharger
- to PETROMSERVICE air compressor - Suplacu de Barcau
Project results:
Making a new, advanced material for the execution of swinging swatches made up of high-speed radial bearings
making a surface coating material for high-speed radial bearings
making a new technology for surface coverage of high-speed radial bearings