A study of alkali polyphosphate/borate/carbonate for high temperature lubrication of silicon steel using ball-on-disc tests

2021 ◽  
Vol 160 ◽  
pp. 107015
Author(s):  
Long Wang ◽  
Anh Kiet Tieu ◽  
Huong T.T. Ta ◽  
Chunyang Xia ◽  
Guojuan Hai ◽  
...  
Keyword(s):  
High Temperature ◽  
Silicon Steel ◽  
Ball On Disc

High temperature deformation of silicon steel

2012 ◽  
Vol 136 (2-3) ◽  
pp. 710-719 ◽  
Author(s):  
Pablo Rodríguez-Calvillo ◽  
Yvan Houbaert ◽  
Roumen Petrov ◽  
Leo Kestens ◽  
Rafael Colás
Keyword(s):  
High Temperature ◽  
Silicon Steel ◽  
High Temperature Deformation ◽  
Temperature Deformation

scholarly journals Effect of Holding Time of Decarbonization Annealing on Recrystallization in Fe-3.2%Si-0.047Nb% Low-Temperature Oriented Silicon Steel

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1209
Author(s):  
Xin Tian ◽  
Shuang Kuang ◽  
Jie Li ◽  
Shuai Liu ◽  
Yunli Feng
Keyword(s):  
Magnetic Properties ◽  
High Temperature ◽  
Low Temperature ◽  
Grain Boundaries ◽  
Annealing Time ◽  
High Energy ◽  
Primary Recrystallization ◽  
Silicon Steel ◽  
Annealing Condition ◽  
Goss Texture

In this study, the effects of decarburization annealing time on the primary recrystallization microstructure, the texture and the magnetic properties of the final product of 0.047% Nb low-temperature grain-oriented silicon steel were investigated by means of OM, EBSD and XRD. The results show that when the decarburization annealing condition is 850 °C for 5 min, the uniform fine primary recrystallization microstructure can be obtained, and the content of favorable texture {111} < 112 > is the highest while that of unfavorable texture {110} < 112 > is the lowest, which is mostly distributed near the central layer. At the same time, there are the most high-energy grain boundaries with high mobility in the primary recrystallization microstructure of the sample annealed at 850 °C for 5 min, and the ∑9 boundary has the highest percentage of grain boundaries. The samples with different decarburization annealing time were annealed at high temperature. It was found that perfect secondary recrystallization occurred after high-temperature annealing when the decarburization annealing condition was 850 °C for 5 min. The texture component was characterized by a single Goss texture, and the size of the Goss grain reached 4.6mm. Under such annealing conditions, the sample obtained shows the optimal soft magnetic properties of B800 = 1.89T and P1.7/50 = 1.33 w/kg.

scholarly journals High-Temperature Tribological Performance of Hard Multilayer TiN-AlTiN/nACo-CrN/AlCrN-AlCrO-AlTiCrN Coating Deposited on WC-Co Substrate

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 909 ◽  
Author(s):  
Asad Alamgir ◽  
Maxim Yashin ◽  
Andrei Bogatov ◽  
Mart Viljus ◽  
Rainer Traksmaa ◽  
...  
Keyword(s):  
High Temperature ◽  
Room Temperature ◽  
Energy Dispersive Spectrometry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mechanical And Tribological Properties ◽  
Diamond Indenter ◽  
Scratch Tests ◽  
Ball On Disc

Mechanical and tribological properties of the hard-multilayer TiN-AlTiN/nACo-CrN/AlCrN-AlCrO-AlTiCrN coating deposited on WC-Co substrate were investigated. The sliding tests were carried out using ball-on-disc tribometer at room (25 °C) and high temperatures (600 and 800 °C) with Al2O3 balls as counterpart. Nano-scratch tests were performed at room temperature with a sphero-conical diamond indenter. The surface morphology and chemical composition were investigated with scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS) and in-situ high-temperature X-ray diffraction (HT-XRD). The phase transition from fcc-(Al,Cr)2O3 into α-(Al,Cr)2O3 was observed at about 800 °C. The results of the tribological tests depends on the temperature, the lowest apparent and real wear volumes were observed on the coating after the test at 800 °C along with the smallest coefficient of friction (COF). The plastic deformation of the coating was confirmed in sliding and nano-scratch tests. The nano-scratch tests revealed the dependence of COF value on the temperature of the sliding tests.

Preparation of Anti-Oxidation Coating on Billet Heating for Silicon Steel

2011 ◽  
Vol 314-316 ◽  
pp. 155-159
Author(s):  
Hua Sheng Chen ◽  
Hua Zhi Gu ◽  
Yan Wen Zhang ◽  
Xi Lai Chen ◽  
Guo Tao Xu ◽  
...  
Keyword(s):  
Electron Microscope ◽  
High Temperature ◽  
Service Life ◽  
Molten Slag ◽  
Linear Expansion ◽  
Oxidation Mechanism ◽  
Silicon Steel ◽  
Linear Expansion Coefficient ◽  
Good Property ◽  
Scanning Electron

Based on the perspective of the linear expansion coefficient, an anti-oxidation coating on billet heating for silicon steel was prepared. The anti-oxidation coating can be used at 1400oC and it has good property of automatic pelling off, and the oxidation burning loss was decreased by 80.65%. The microstructure of the coating was observed by scanning electron microscope. The results indicate that the high-temperature anti-oxidation mechanism of the coating on the surface of steel billet is cavity clogged by molten slag, and the service life of anti-oxidation coating is relied on the resistance to permeation and erosion of molten slag.

A New Chromate-Free Insulating Coating on Silicon Steel

2014 ◽  
Vol 1004-1005 ◽  
pp. 757-762 ◽  
Author(s):  
Shuang Hong Wang ◽  
Yong Feng Long ◽  
Shi Lu Zhao ◽  
Cheng Qiang An ◽  
Ke Ding
Keyword(s):  
High Temperature ◽  
Salt Spray ◽  
Silicon Steel ◽  
Salt Spray Test ◽  
Neutral Salt ◽  
Test Results ◽  
High Temperature Annealing ◽  
Electrochemical Test ◽  
Comprehensive Performance ◽  
Resistance Value

The water-based paint had been examined to prepare a new chromate-free insulating coating on silicon steels. The structure of the insulating coating was characterized by scanning electron microscopy, energy dispersive spectroscopy and infrared spectroscopy. Adhesion, high temperature annealing, and surface insulating resistance were measured. Corrosion resistance was investigated by neutral salt spray test and electrochemical test. Results exhibited that the insulating coating had excellent comprehensive performance. The adhesive level was 5B degree; the high temperature annealing test showed no coating degradation after heat treatment of 2 h at 450 °C in air or at 750 °C in nitrogen; the salt spray test showed the corrosion area was less than 2 % after the 12 h salt spray; when the coating thickness was 1.0-1.2 μm, the surface insulating resistance value was 380-420 Ω/mm2.

scholarly journals Preparation, Mechanical Properties, and High-Temperature Wear Resistance of Ti–Al–B alloy

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3751 ◽  
Author(s):  
Gongjun Cui ◽  
Yanping Liu ◽  
Guijun Gao ◽  
Huiqiang Liu ◽  
Sai Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
High Temperature ◽  
Matrix Alloy ◽  
Al Alloy ◽  
Fatigue Wear ◽  
Specific Strength ◽  
Wear And Friction ◽  
Friction Performance ◽  
Ball On Disc

Ti–Al matrix alloy reinforced with a high content of boron was fabricated by using a high-temperature alloying method and powder metallurgy technique (P/M). The preparation method of Ti–Al–B alloying powder was put forward. Phases, microstructure, and mechanical properties of the alloys were investigated. Wear and friction performance were studied by using a ball-on-disc tribotester sliding against a Si3N4 ceramic ball from 23 °C (room temperature) to 900 °C. The Ti–Al–B alloy had a higher specific strength than that of the Ti–Al alloy. The boron element obviously enhanced the wear resistance and mechanical properties of the alloys because of the formation of borides (TiB2 and AlB2) in matrices and the stable oxide film on the wear tracks. Friction coefficients of alloys were independent of the boron element. The wear mechanisms of the alloys transferred from fatigue wear to oxidative wear with the increase in temperature.

High Temperature Wear Behaviors of Electro-Brush Plating Ni-P Coatings

2010 ◽  
Vol 97-101 ◽  
pp. 1506-1509 ◽  
Author(s):  
Zhi Ming Li ◽  
Shi Qiang Qian ◽  
Wei Wang ◽  
Hong Wei Shen ◽  
He Sun Long
Keyword(s):  
High Temperature ◽  
Wear Test ◽  
Wear Properties ◽  
High Temperature Wear ◽  
Frictional Wear ◽  
Spalling Failure ◽  
Coating Time ◽  
Brush Plating ◽  
Disc Configuration ◽  
Ball On Disc

This paper have studied the high temperature frictional wear properties of Ni-P coatings on 20CrMo steel manufactured by electro-brush plating. A ball-on-disc configuration with no lubricants was employed and 4 mm diameter Si3N4 ball was used as static counterpart. The results showed that with the coating time increased from 0 to 24 minutes, the overall average friction coefficient and the mass worn loss of specimens were both declined in the wear test at 450 oC for 180 minutes. The wear became slighter as the coating time increased. When the coating time were 0, 6, 12 and 18 minutes, the main wear form of samples were deep microscopic plough cutting and spalling failure. As the coating time increased to 24 minutes, its main wear form were shallower microscopic plough cutting, almost no spalling failure.

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