P/M Turbo Charger and Armature Components: Plasma Nitriding and Nitrocarburizing to Reduce Friction Wear

Roliński, E.; Sharp, G.; Brøndum, K; Peterson, N.

doi:10.4271/2005-01-0722

Cited by 6 publications

(3 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2b). This fact also underscores that the application of plasma methods to variety of PM sintered components requiring surface treatment is fully justified (Ref 16,17).…”

Section: Introductionmentioning

confidence: 88%

Nature of Surface Changes in Stamping Tools of Gray and Ductile Cast Iron During Gas and Plasma Nitrocarburizing

Roliński¹,

Konieczny²,

Sharp³

2009

J. of Materi Eng and Perform

Self Cite

View full text Add to dashboard Cite

Two cast irons, pearlitic-ferritic gray and ferritic ductile, were plasma and gas nitrocarburized at the same temperature and for the same processing time to produce a compound zone of about 10-14 lm thick. It was demonstrated that both processes caused changes in the surface roughness of the irons, and the most dramatic increase of roughness was observed after gas nitrocarburizing of the gray cast iron. It was shown that the primary reason that the results were not the same is the difference in the nitriding mechanism. Significant penetration of the surface voids and imperfections between the graphite particles and the metallic matrix by ammonia molecules led to the formation of a locally thicker compound zone and a bulging of the metallic matrix above the surface. This phenomenon did not occur in the plasma process and as a result the surface changes were much smaller than in the gas process.

show abstract

“…2b). This fact also underscores that the application of plasma methods to variety of PM sintered components requiring surface treatment is fully justified (Ref 16,17).…”

Section: Introductionmentioning

confidence: 88%

Nature of Surface Changes in Stamping Tools of Gray and Ductile Cast Iron During Gas and Plasma Nitrocarburizing

Roliński¹,

Konieczny²,

Sharp³

2009

J. of Materi Eng and Perform

Self Cite

View full text Add to dashboard Cite

show abstract

“…The composition of the raceway steel of the tested bearings compared to the conventional steel 100Cr6 is given in Table 1. The tested bearing steel is heat treated and nitrided, which results in a higher surface hardness and a high adhesive wear resistance [15]. The conventional raceway steel 100Cr6 is also heat treated [16].…”

Section: Figure 1 Bearing Data and Geometrymentioning

confidence: 99%

Evaluation of hybrid spindle bearings with nitriding raceway steels under high rotational speeds

Gärtner,

Brecher,

Neus

et al. 2023

tribomat

View full text Add to dashboard Cite

The further development of high-precision bearings regarding higher speeds and load-carrying capacity is becoming increasingly challenging. One approach to meet the increased requirements is to use new high-performance raceway steels. Particularly for a highly stressed lubricant film, where seizure may occur, the bearing material properties can make a key contribution in increasing the lifetime. In the following, the test results of hybrid spindle bearings of type 7008 made of nitriding steel are analysed. The bearings were tested in an endurance run for a constant speed parameter of 2.5 million ndm and a maximum contact stress of 2,900 MPa at the inner ring contact. The operational behaviour was validated based on the bearing outer ring temperature and the acceleration level in the test rig. A further sample test in endurance runs with an increased speed parameter of 2.8 million ndm and a maximum contact stress of 3,200 MPa at the inner ring shows that the performance limit of the bearing is even higher than initially assumed. The microscope analyses of the bearing steels after the test show low wear. An analysis of the test conditions in terms of contact stresses, lifetime and the pv value illustrates that the bearings can run far above standard conditions. The experimental results show that the operational limits of hybrid spindle bearings with a raceway made of nitriding steels are significantly higher than expected.

show abstract

“…Some of the atoms are redeposited on the cathode while others are dispersed in the system [6,7]. But it is possible that this phenomenon can provokes an excess of atoms which want to return to the surface and this situation might be detrimental of the nitriding process [8]. The mechanism of heat transfer during heating of the cathode in a glow discharge is very complex.…”

Section: Introductionmentioning

confidence: 99%

Tribological aspects of plasma nitrided layer in the case of a non-conventional treated steel for industrial gearings

Papadatu

2020

METAL 2020 Conference Proeedings

View full text Add to dashboard Cite

Plasma nitriding applied after a non-conventional treatment in magnetic field to the steel used in industry, have been studied in this paper. It have been demonstrated that the energy of the magnetic field intervenes in the balance of the global power of the phase transformations in solid state altering the thermodynamics, kinetics and the mechanisms of processes, the structures and some properties of the steel. The samples have been tested using an Amsler stand for wear tests (dry friction) and the diffractometric analysis completed this study. The plasma nitriding plant used was named the INI 150, was made by the Institute of Radiation Physics and Technology in collaboration with the "Electrotechnics" Enterprise and the Nuclear Apparatus (ICEFIZ) from Romania and was destined for technological research, but can also be used for industrial nitriding of small pieces. INI 150 was based on the physical phenomenon of a double cathode at plasma (ion) nitriding. The paper is a review of my researches from the last years.

show abstract

P/M Turbo Charger and Armature Components: Plasma Nitriding and Nitrocarburizing to Reduce Friction Wear

Cited by 6 publications

References 3 publications

Nature of Surface Changes in Stamping Tools of Gray and Ductile Cast Iron During Gas and Plasma Nitrocarburizing

Nature of Surface Changes in Stamping Tools of Gray and Ductile Cast Iron During Gas and Plasma Nitrocarburizing

Evaluation of hybrid spindle bearings with nitriding raceway steels under high rotational speeds

Tribological aspects of plasma nitrided layer in the case of a non-conventional treated steel for industrial gearings

Contact Info

Product

Resources

About