A Rotating-Disk Sample Holder for the Sparking of Flat-Metal-Disk Samples

Wear Resistance of Aluminized Steel Plates The results of the abrasion resistance measurements of aluminized steel strips are presented in the hereby paper. Steel strips of DX52D+AS120 grade, before and after a heat treatment at temperatures of 200-1000°C for 1 - 5760 minutes, were tested. Tests of the abrasion resistance were carried on in a specially built device: rotating disk - sample performing a plane-rotary motion, with an application of a lubricating medium. Examinations of the abrasion resistance were also performed by means of the block-on-ring tester. Estimations of a coating mass loss, roughness and thickness changes were carried on. The obtained results are illustrated by diagrams and macro- and micro-observations. Phase analysis investigations were also performed on samples selected after the abrasibility testing. The range of the heat treatment parameters - after which the Al-Si coating increased its abrasion resistance - was estimated.

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INSTALLATION AND ME TION AND METHODOLOGY FOR DE OGY FOR DETERMINING OF TERMINING OF ANTIFRICTIONAL PROPER AL PROPERTIES OF AN TIES OF ANTISTATIC-HEA TIC-HEATCONDUCTING COMPOSI TING COMPOSITE POLYMERIC M YMERIC MATERIALS INTERACTING WI TING WITH FIBROUS M TH FIBROUS MASS (CO ASS (COTTON-RAW)

Technical science and innovation ◽

10.51346/tstu-01.18.2.-77-0001 ◽

2018 ◽

Vol 2 ◽

pp. 20-23

Author(s):

S Negmatov ◽

◽

N Abed ◽

G Gulyamov ◽

Q Eshkabilov

Keyword(s):

Flat Surface ◽

Rotating Disk ◽

Machine Building ◽

Polymer Materials ◽

Heat Conducting ◽

Friction Forces ◽

Friction Zone ◽

Electrostatic Charges ◽

Antifriction Properties ◽

Disk Sample

The paper Presents a disk tribometer installation and allows to determine the antifriction properties of machine-building composite antistatic-heat-conducting polymer materials working in interaction with the fibrous mass (raw cotton). A method for determining the friction force, temperature and electrostatic charge values arising in the friction zone is developed. The friction of the fibrous material is carried out on the flat surface of the rotating disk sample from the material under study at specified clamping pressures and sliding speeds. Values of friction forces, temperatures and values of electrostatic charges of the tested sample in a zone of friction with cotton-raw are measured by means of sensors.

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Analysis of the Parallel-Disk Sample Holder for Dielectric Permittivity Measurement

IEEE Transactions on Geoscience and Remote Sensing ◽

10.1109/tgrs.1987.289831 ◽

1987 ◽

Vol GE-25 (5) ◽

pp. 534-540 ◽

Cited By ~ 18

Author(s):

Liang Shen ◽

Herzl Marouni ◽

Yu-xing Zhang ◽

Xian-di Shi

Keyword(s):

Dielectric Permittivity ◽

Sample Holder ◽

Parallel Disk ◽

Permittivity Measurement ◽

Disk Sample

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Investigation of wear conditions of a composite material based on an anti-friction alloy AO20-1 reinforced with Ti particles

Transaction Kola Science Cetnre ◽

10.37614/2307-5252.2021.2.5.008 ◽

2021 ◽

Vol 12 (2-2021) ◽

pp. 36-41

Author(s):

P. A. Bykov ◽

◽

I. E. Kalashnikov ◽

L. I. Kobeleva ◽

A. G. Kolmakov ◽

...

Keyword(s):

Composite Material ◽

Sliding Wear ◽

Rotating Disk ◽

Intermetallic Phases ◽

Dry Sliding Wear ◽

Dry Sliding ◽

Ti Particles ◽

Wear Modes ◽

Disk Sample ◽

Wear Tests

Сomposite material samples were obtained by the method of reaction casting by mixing titanium particles to obtain intermetallic phases Al3Ti. Dry sliding wear tests were carried out using a fixed sleeve (steel 45) against a rotating disk (sample) at sliding speeds from 0.25 to 0.75 m/s and loads from 0.5 to 3.5 MPa.There were constructed maps of wear rate, which determine the friction modes during testing. There were shown boundaries and conditions of changing wear modes.

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Preparation of cross-sectional samples for near-surface TEM studies

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010012669x ◽

1987 ◽

Vol 45 ◽

pp. 380-381

Author(s):

R.C. Dickenson ◽

K.R. Lawless

Keyword(s):

Standard Sample ◽

Surface Region ◽

Specimen Preparation ◽

Thick Sheet ◽

Drill Bit ◽

Sample Holder ◽

Metal Interface ◽

Cross Sectional ◽

Near Surface ◽

Cold Worked

In thermal oxidation studies, the structure of the oxide-metal interface and the near-surface region is of great importance. A technique has been developed for constructing cross-sectional samples of oxidized aluminum alloys, which reveal these regions. The specimen preparation procedure is as follows: An ultra-sonic drill is used to cut a 3mm diameter disc from a 1.0mm thick sheet of the material. The disc is mounted on a brass block with low-melting wax, and a 1.0mm hole is drilled in the disc using a #60 drill bit. The drill is positioned so that the edge of the hole is tangent to the center of the disc (Fig. 1) . The disc is removed from the mount and cleaned with acetone to remove any traces of wax. To remove the cold-worked layer from the surface of the hole, the disc is placed in a standard sample holder for a Tenupol electropolisher so that the hole is in the center of the area to be polished.

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Problems with oxygen analysis in the system MgO-Al2O3-SiO2 with the electron microprobe

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100132753 ◽

1992 ◽

Vol 50 (2) ◽

pp. 1624-1625

Author(s):

Michel Fialin ◽

Guy Rémond

Keyword(s):

Transition Metal ◽

Metal Oxides ◽

Transition Metal Oxides ◽

Electrostatic Charge ◽

Carbon Layer ◽

Sample Holder ◽

Rock Matrix ◽

Electrical Discharges ◽

Thin Carbon ◽

Beam Instabilities

Oxygen-bearing minerals are generally strong insulators (e.g. silicates), or if not (e.g. transition metal oxides), they are included within a rock matrix which electrically isolates them from the sample holder contacts. In this respect, a thin carbon layer (150 Å in our laboratory) is evaporated on the sections in order to restore the conductivity. For silicates, overestimated oxygen concentrations are usually noted when transition metal oxides are used as standards. These trends corroborate the results of Bastin and Heijligers on MgO, Al2O3 and SiO2. According to our experiments, these errors are independent of the accelerating voltage used (fig.l).Owing to the low density of preexisting defects within the Al2O3 single-crystal, no significant charge buildup occurs under irradiation at low accelerating voltage (< 10keV). As a consequence, neither beam instabilities, due to electrical discharges within the excited volume, nor losses of energy for beam electrons before striking the sample, due to the presence of the electrostatic charge-induced potential, are noted : measurements from both coated and uncoated samples give comparable results which demonstrates that the carbon coating is not the cause of the observed errors.

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