scholarly journals Friction surface modifiers of carbon-containing material for high-temperature operation

2021 ◽  
Vol 2124 (1) ◽  
pp. 012013
Author(s):  
M N Roshchin
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Friction Coefficient ◽  
Friction Surface ◽  
Atmospheric Conditions ◽  
Temperature Range ◽  
Tribological Tests ◽  
Surface Modifiers ◽  
Antifriction Properties ◽  
High Temperature Operation

Abstract The results of high-temperature tribological tests of carbon-containing material in friction on heat-resistant stainless steel 40X13 in the temperature range from 20 to 700 °C under atmospheric conditions are presented. Friction surface modifiers “Argolon-2D” material improve antifriction properties and decrease friction coefficient value. Friction coefficient when using Ni-Se-PTFE modifier at load of 0.67 MPa and speed of 0.16 m/s is less by 5% than at speed of 0.05 m/s, and at speed of 0.25 m/s friction coefficient is less by 13% than at speed of 0.05 m/s. At 500 °C and a load of 0.67 MPa the friction coefficient when using Ni-Se-PTFE modifier is 30% higher than when using InSb-PTFE modifier, and the friction coefficient when using CuO-PTFE modifier is 1.2 times higher than when using InSb-PTFE modifier.

High Temperature Rupture, Fatigue, and Damping Properties of AISI Designation 616 (Type 422 Stainless) Steel

1965 ◽  
Vol 87 (2) ◽  
pp. 325-332 ◽  
Author(s):  
R. G. Matters ◽  
A. A. Blatherwick
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Steam Turbine ◽  
Stress Rupture ◽  
Fatigue Tests ◽  
Damping Properties ◽  
Temperature Range ◽  
Stress Ratios ◽  
Mean Stresses ◽  
Turbine Blading

This paper covers the high temperature rupture, fatigue, and damping properties of AISI Designation 616 (Type 422) steel conforming substantially to the requirements of ASTM specification A437 grade B4C. This material has been extensively used for boiling and for steam turbine blading for service in the temperature range of 850 to 1000 F. The results of stress rupture and fatigue tests of smooth and notched bars at 800, 950, and 1050 F are presented. Stress rupture tests extend to 2000 hr or more and fatigue tests generally extend to 2 × 107 cycles or about 100 hr. The fatigue tests were performed in a direct stress machine at stress ratios A = infinity, 2.5, and 1.0. Vibration decay damping tests with various mean stresses were performed at 75, 800, 950, and 1050 F.

RA 321

Alloy Digest ◽  
2003 ◽  
Vol 52 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
High Temperature ◽  
Austenitic Stainless Steel ◽  
Physical Properties ◽  
Tensile Properties ◽  
Temperature Range ◽  
Temperature Performance

Abstract RA 321 is a titanium-stabilized austenitic stainless steel commonly used for service in the 540 to 870 deg C (1000 to 1600 deg F) temperature range. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness, creep, and fatigue. It also includes information on high temperature performance as well as machining. Filing Code: SS-890. Producer or source: Rolled Alloys Inc.

scholarly journals Tribological Investigations of TiC+a-C:H Coatings Manufactured on X38CrMoV5-1 Steel Using PVD Technology

2013 ◽  
Vol 334-335 ◽  
pp. 97-104
Author(s):  
Marcin Golabczak ◽  
Philippe Jacquet ◽  
Corinne Nouveau ◽  
Romain Fliti
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Protective Coatings ◽  
Physical Method ◽  
High Wear Resistance ◽  
Pvd Coatings ◽  
Low Friction ◽  
Tribological Tests ◽  
Temperature Conditions ◽  
Uncoated Steel

X38CrMoV5-1 steel is a typical tool steel commonly used in forging and plastic moulding industry for production of ejectors, slides, dies, etc. In plastics moulding a lot of these parts sustain relative movement. Because of this, some seizing or micro-welding may appear, especially when lubrication is not used. For many years, the different types of protective coatings were developed to avoid such problems. Most of the obtained solutions relate to the manufacturing of low friction coatings obtained by different nitriding processes and by CVD or PVD methods. In this article, the friction coefficients and the wear resistances of TiC+a-C:H protective coatings manufactured on X38CrMoV5-1 steel samples by using PVD technology are studied. The investigations are based on tribometer tests in different temperature conditions. The process of deposition of PVD coatings was realized by using multisource, hybrid factory-scale equipment of type URM 079. This equipment allows for deposition of coatings by a physical method. The tribological tests were performed using a precision high temperature tribometer under ambient and high temperature conditions with a steel and corundum balls as a counter-samples. In this paper, the results of these tribological tests are presented. It is shown that the measured friction coefficient of steel samples with PVD coatings is significantly lower than the friction coefficient of uncoated steel. It is also shown that X38CrMoV5-1 steel samples with manufactured TiC+a-C:H coatings are characterized by a very low friction coefficient and high wear resistance.

scholarly journals Corrosion Behavior of AISI 316L Stainless Steel Used as Inner Lining of Bimetallic Pipe in a Seawater Environment

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1539
Author(s):  
Daquan Li ◽  
Qingjian Liu ◽  
Wenlong Wang ◽  
Lei Jin ◽  
Huaping Xiao
Keyword(s):  
High Pressure ◽  
Stainless Steel ◽  
High Temperature ◽  
316L Stainless Steel ◽  
Oil And Gas ◽  
Gas Production ◽  
Atmospheric Conditions ◽  
Oil And Gas Production ◽  
Corrosion Rates ◽  
Seawater Environment

Seawater leakage commonly leads to corrosion in the inner lining of submarine bimetallic pipes, with significant financial implications for the offshore oil and gas production industry. This study aims to improve understanding of the performance of bimetallic pipes by investigating the corrosion behaviors of mechanically bonded 316L stainless steel. Immersion experiments were conducted in a seawater environment, under both atmospheric conditions and high temperature and high pressure conditions, and corroded surfaces were examined using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) to reveal micromorphology and elementary compositions. The results demonstrated that the corrosion rates of the bonded 316L specimen were between 5% and 20% higher than those of specimens without bonding under atmospheric conditions. This is attributed to the stress cracking that occurs during corrosion. Under high temperature and high pressure conditions, the corrosion rates were remarkably increased (91% to 135%) and the corrosion process took longer to reach equilibrium. This may be attributed, firstly, to the products becoming increasingly porous and weak, and also to the fluid stress caused by stirring in these experiments to simulate seawater movement.

High-temperature friction units with carbon-containing materials

2021 ◽  
pp. 42-44
Author(s):  
M.N. Roshchin
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Contact Pressure ◽  
High Temperatures ◽  
Carbon Composites ◽  
Friction Contact ◽  
2D Material ◽  
Friction Units ◽  
Antifriction Properties ◽  
Frictional Interaction

The frictional interaction of carbon-carbon composites with steel at high temperatures is considered. Antifriction properties of carbon composites are investigated at friction on a steel at speeds of 0,050,25 m/s and pressures of 0,31,0 MPa. The advantages of Hardcarb-T material in comparison with Argalon-2D material are experimentally determined. Keywords: temperature, friction, contact pressure, composites, steel, speed, friction coefficient. [email protected]

1700V, 20A 4H-SiC DMOSFETs Optimized for High Temperature Operation

2011 ◽  
Vol 679-680 ◽  
pp. 633-636 ◽  
Author(s):  
Brett A. Hull ◽  
Sei Hyung Ryu ◽  
Q. Jon Zhang ◽  
Charlotte Jonas ◽  
Michael J. O'Loughlin ◽  
...  
Keyword(s):  
High Temperature ◽  
Leakage Current ◽  
Entire Temperature Range ◽  
Electrical Characteristics ◽  
Switching Circuit ◽  
Inductive Load ◽  
Temperature Range ◽  
Continuous Current ◽  
Switching Characteristics ◽  
High Temperature Operation

DMOSFETs fabricated in 4H-SiC with capabilities for blocking in excess of 1700V and conducting 20A continuous current in the on-state are presented. These SiC DMOSFETs remain functional to temperatures in excess of 225°C, with leakage current at 1700V at 225°C of less than 5 A with VGS = 0V. The DMOSFETs show excellent switching characteristics, with total switching energy of 1.8 to 1.95 mJ over the entire temperature range of testing (25°C to 200°C), when switched from the blocking state at 1200V to conducting at 20A in a clamped inductive load switching circuit. The electrical characteristics are compared to commercially available Si IGBTs rated to 1700V with similar current ratings as the SiC DMOSFET described herein.

Comparison of High Temperature Operation of Silicon Carbide MOSFETs and Bipolar Junction Transistors

2010 ◽  
Vol 2010 (HITEC) ◽  
pp. 000136-000143
Author(s):  
Jim Richmond ◽  
Sei-Hyung Ryu ◽  
Qingchun (Jon) Zhang ◽  
Brett Hull ◽  
Mrinal Das ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
High Temperature ◽  
Bipolar Junction Transistors ◽  
Power Devices ◽  
Temperature Range ◽  
Silicon Devices ◽  
Bipolar Switching ◽  
Operational Temperature ◽  
Full Benefit ◽  
High Temperature Operation

Power devices based on Silicon Carbide (SiC) have unmatched potential for extending the operational temperature range of power electronics well past what is possible with silicon devices. SiC JBS diodes are already demonstrating part of that potential but the full benefit will not be realized until a SiC power switch is available. Recently, normally off SiC unipolar and bipolar switching devices have become available with the manufacture of 1200V, 20A MOSFETs and 1200V, 20A bipolar junction transistors (BJT). While both of these device types have undergone considerable study, most of this characterization has been conducted in the normal commercial temperature range which has an upper limit of 150 – 175°C. The SiC BJT is considered to be a superior device for high temperature operation due to its lower on-state voltage and increased reliability due to it not having a gate oxide. As presented, the advantages of the SiC BJT over the SiC MOSFET are not as great as expected and may not warrant the increased complexity of dealing with the current driven base that the BJT requires. Otherwise, both devices offer exceptional performance at high temperature.

Ammonothermal Crystallization of AlN Crystals

2005 ◽  
Vol 878 ◽  
Author(s):  
Alexander I. Motchanyy ◽  
Alexey A. Reu ◽  
Vladimir S. Kovalenko ◽  
Vladimir G. Balakirev
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Electronic Devices ◽  
Optoelectronic Devices ◽  
Average Crystallite Size ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Range ◽  
Potential Applications ◽  
Supercritical Ammonia

AbstractIII-Nitrides (GaN, AlN and other compounds) have attracted vast interest due to their unique properties and potential applications in optoelectronic devices operating in the blue and UV spectral regions and for the construction of electronic devices capable of operating under high power and high temperature conditions.Nanocrystalline AlN powder were obtained by AMMONO method, in which nitridization of Al metal occurs in highly chemical active supercritical ammonia using both NH4Cl as mineralizer. The experiments were performed in the temperature range of 350-550 °C and pressure of 80-120 MPa in stainless steel autoclaves for up to 5 days. Nanocrystalline AlN were spontaneously nucleated on the lower walls of the autoclaves. The obtained AlN powder was characterized by X-ray diffraction. Nanocrystalline AlN powders with average crystallite size 20-30 nm were produced in the temperature range of 450-550 °C.

Properties of the Plasma Sprayed NiCrAlY+ (ZrO2+CaO) Graduated Coating on 1Cr18Ni9Ti Steel

2010 ◽  
Vol 34-35 ◽  
pp. 1876-1880
Author(s):  
Fei Chen ◽  
Hai Zhou ◽  
Jia Qing Chen ◽  
Fan Xiu Lu
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Friction Coefficient ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Steel Surface ◽  
Dry Sliding ◽  
Temperature Oxidation ◽  
1Cr18ni9ti Steel ◽  
Plasma Sprayed

The plasma sprayed gradated coating with the bottom layer of NiCrAlY and the top layer of (ZrO2+CaO) was prepared on the 1Cr18Ni9Ti steel surface by the plasma spraying technique. The phase structure and morphology of the gradated coating were analyzed by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The high temperature oxidation resistance of the plasma sprayed samples at 800°C was investigated. The oxidation kinetics curve was worked out. The wear-resistance behavior of the graduated coating under dry sliding against GCr15 steel was evaluated on a ball-on-disc test rig. The results show that the thickness of gradated coating is about 320μm. The plasma sprayed gradated coating on stainless steel surface can improve the high temperature oxidation resistance of stainless steel. The oxidation rate of stainless steel is less than that of plasma sprayed gradated coating. The oxidation coating of plasma sprayed sample was very dense and is not easily exfoliated. The dense oxidation coating prevents the stainless steel from more oxidation. The friction coefficient of the 1Cr18Ni9Ti substrate was about 0.33 on dry sliding against the GCr15 steel, while the graduated coating experienced abated friction coefficient to 0.21 on the same testing condition.

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