Corrigendum to “Scatter in delamination wear tests of tribopair materials used in articulated implants” [Tribol Int. 133 (2019) 172–181]

The aim of this study was to determine the influence of powder fillers on the tribological properties of composite materials used for dental fillings. The investigated composites contain a fluoridated filler (based on Ba-Sr-Al-P-Na-silicate glass fillers) as a fluoride source as well as different powder fillers (friction modifiers) e.g. silicon nitride (Si3N4), boron nitride (BN), polyethylene (PE), polytetrafluoroethylene (PTFE). Composite disks were photo-cured and tested for wear against harder stainless-steel counterface. Wear tests were carried out by means of special tribotester in the presence of phosphate buffer as a lubricant. Influence of the load and filler contents on the friction coefficients and wear were estimated. The interaction between the filler particles and organic matrix and its influence on the tribological behavior of prepared specimens were observed. Organic powder fillers (PE, PTFE) reduced the friction coefficient and the wear of tested composite materials for dental fillings. Inorganic friction modifiers (Si3N4, BN) did not exhibit this effect.

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Tribological Analysis by Concentration Effect of Boron Carbide and Graphite on the Aluminum Composites

Materials Science Forum ◽

10.4028/www.scientific.net/msf.969.163 ◽

2019 ◽

Vol 969 ◽

pp. 163-168

Author(s):

K. Rajkumar ◽

Subramanian Varun ◽

Ganesh Prasanna ◽

Chellu Sreyas ◽

A. Gnanavelbabu

Keyword(s):

Boron Carbide ◽

Matrix Composites ◽

Tribological Behaviour ◽

Sem Image ◽

Pin On Disc ◽

Tribological Analysis ◽

Materials Used ◽

Carbide Particles ◽

Sem Image Analysis ◽

Wear Tests

Aluminium matrix composites (AMCs) are indispensable materials used extensively in the aerospace and automobile industries and are highly endorsed due to their good mechanical properties. In this paper, various compositions of the AMCs were fabricated, tested and analyzed using pin on disc tribometer test to understand the tribological behaviour and wear mechanism properties. The volume percentages of the Aluminium composite reinforced with boron carbide and graphite present in the form of Al-B4C-Graphite are Al-B4C (5%)-Graphite (5%), Al-B4C (10%)-Graphite (5%), Al-B4C (5%)-Graphite (15%), Al-B4C (10%)-Graphite (15%), Al-B4C (15%)-Graphite (15%). Loads were varied in steps of 10N, from 10N to 50N while the sliding velocity was correspondingly set as 0.7, 1.4 and 2.1m/s. SEM image analysis was conducted to understand surface tribology after wear tests. The composite Al-B4C (15%)-Graphite (15%) exhibited best wear resistance which can be credited to the bearing capacity of boron carbide particles and adherent graphite layer.

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Galling wear between ASTM 6061 aluminum and grade D2 tool steel

Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology ◽

10.1177/13506501211059785 ◽

2021 ◽

pp. 135065012110597

Author(s):

Erick Martínez-Méndez ◽

Daniel Antonio-Aguirre ◽

Manuel Vite-Torres ◽

José F Márquez-Santiago ◽

Walter R Tuckart ◽

...

Keyword(s):

Automotive Industry ◽

Severe Form ◽

Test Surface ◽

Automotive Components ◽

Post Test ◽

Series Of Experiments ◽

Materials Used ◽

D2 Steel ◽

Wear Tests

In the automotive industry, galling is a huge problem either for the tool life or the quality of the stamping metal component. Galling is a severe form of scuffing associated with gross damage to the surface or failure. This work aims to carry out a series of experiments of galling tests at different loads and similar roughness with 6061 aluminum and D2 steel, common materials used in automotive components and tools respectively. A tribometer was employed to generate Galling wear, the button-on-button configuration, according to the ASTM G-196-08 standard. The results show the threshold of minimum load without galling wear. Post-test-surface analysis of the specimens was conducted by confocal microscopy to identify the damage generated during the wear tests. Additionally, a couple of friction tests were carried only to illustrate the friction coefficient behavior under galling conditions.

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Proses Pembuatan Komposit Matriks Logam Al5Cu4Mg/Al2O3(p) dengan Metode Pengadukan dan Tempa

Metal Indonesia ◽

10.32423/jmi.2021.v43.34-47 ◽

2021 ◽

Vol 43 (1) ◽

pp. 34

Author(s):

Toni Bambang Romijarso ◽

Rudi Subagja ◽

Dedi Priadi

Keyword(s):

Specific Gravity ◽

Manufacturing Industry ◽

Aluminum Matrix ◽

Mechanical Tests ◽

Wetting Agent ◽

Long Time ◽

Physical Tests ◽

Al2o3 Reinforcement ◽

Materials Used ◽

Wear Tests

AbstrakKomposit Matriks Logam (KML) merupakan salah satu material yang banyak digunakan di industri manufaktur terutama yang berbasis alumunium, karena logam ini mempunyai berat jenis yang rendah. Pada saat ini pembuatan KML bermatriks alumunium dengan penguat Al2O3 sudah banyak dibuat dan digunakan di industri. Proses pembuatan KML di Indonesia merupakan hal yang baru-baru ini ramai diminati, meskipun penelitian awal sudah dilakukan jauh sebelumnya. Faktor penting pada pembuatan KML adalah menghidari adanya keropos atau adanya porositas pada hasil produk. Oleh karena itu, pada percobaan ini setelah dilakukan proses pengadukan dilanjutkan dengan proses tempa untuk mengurangi adanya porositas tersebut. Bahan yang digunakan sebagai matriks adalah Al-5%Cu-4%Mg dimana Mg sebagai wetting agent, sedangkan penguat yang digunakan adalah 5 dan 10% Vf Al2O3. Pengujian mekanik yang dilakukan antara lain uji tarik, kekerasan dan keausan, sedangkan pengujian fisik, yaitu: metalografi, berat jenis, porositas, SEM/EDS dan XRD, untuk melihat fasa dan senyawa baru. Hasil pengujian menunjukkan dengan adanya penguat Al2O3 terjadi kenaikkan sifat mekanik antara lain dengan naiknya angka kekerasan dan naiknya nilai ketahanan aus. AbstractThe Metal Matrix Composite (MMCs) is one of the widely used materials in the manufacturing industry, especially those based on aluminum, because this metal has low specific gravity. At this time, aluminum matrix KML with Al2O3 reinforcement has been widely made and used in industry. The process of making MMCs in Indonesia have just developed recently, even tough the previous research have been conducted for a long time. The important factor in making MMCs in to prevent the porosity at it’s product. This is the reason why we conduct a forging process after the agitation process. The materials used as matrix is Al-5%Cu-4%Mg where Mg is the wetting agent, while the reinforcement used is 5 and 10% Vf Al2O3. Mechanical tests include: tensile, hardness and wear tests, while physical tests: metallography, specific gravity, porosity, SEM/EDS and XRD, to see new phases and compounds. With the addition of Al2O3 reinforcement there is an increase in mechanical properties, among others, by increasing the number of hardness and increasing wear resistance.

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Deformation Replication

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100068394 ◽

1970 ◽

Vol 28 ◽

pp. 280-281

Author(s):

J. Temple Black

Keyword(s):

Cutting Speed ◽

Machining Process ◽

Depth Of Cut ◽

Rake Face ◽

Orthogonal Machining ◽

Aluminum Chips ◽

Before And After ◽

Materials Used ◽

Glass Knife ◽

Very High

Tool materials used in ultramicrotomy are glass, developed by Latta and Hartmann (1) and diamond, introduced by Fernandez-Moran (2). While diamonds produce more good sections per knife edge than glass, they are expensive; require careful mounting and handling; and are time consuming to clean before and after usage, purchase from vendors (3-6 months waiting time), and regrind. Glass offers an easily accessible, inexpensive material ($0.04 per knife) with very high compressive strength (3) that can be employed in microtomy of metals (4) as well as biological materials. When the orthogonal machining process is being studied, glass offers additional advantages. Sections of metal or plastic can be dried down on the rake face, coated with Au-Pd, and examined directly in the SEM with no additional handling (5). Figure 1 shows aluminum chips microtomed with a 75° glass knife at a cutting speed of 1 mm/sec with a depth of cut of 1000 Å lying on the rake face of the knife.

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High Voltage Transmission Microscopy of Surveyor III Camera Shrouds

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100064748 ◽

1971 ◽

Vol 29 ◽

pp. 138-139

Author(s):

W. R. Duff ◽

L. E. Thomas ◽

R. M. Fisher ◽

S. V. Radcliffe

Keyword(s):

Alloy Sheet ◽

Transmission Microscopy ◽

Television Camera ◽

Window Method ◽

Transmission Electron ◽

Microstructural Effects ◽

Lunar Environment ◽

Successful Retrieval ◽

Materials Used ◽

Abrasive Paper

Successful retrieval of the television camera and other components from the Surveyor III spacecraft by the Apollo 12 astronauts has provided a unique opportunity to study the effects of a known and relatively extensive exposure to the lunar environment. Microstructural effects including those produced by micro-meteorite impact, radiation damage (by both the solar wind and cosmic rays) and solar heating might be expected in the materials used to fabricate the spacecraft. Samples received were in the form of 1 cm2 of painted unpainted aluminum alloy sheet from the top of the camera visor (JPL Code 933) and the sides (935,936) and bottom (934) of the lower camera shroud. They were prepared for transmission electron microscopy by first hand-grinding with abrasive paper to a thickness of 0.006". The edges were lacquered and the sample electropolished in 10% perchloric methanol using the “window” method, to a thickness of ~0.001". Final thinning was accomplished by polishing 3 mm punched disks in an acetic-phosphoric-nitric acid solution.

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Structure-property relationships of PE/PP sandwiched films

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100126998 ◽

1987 ◽

Vol 45 ◽

pp. 454-455

Author(s):

J. Petermann ◽

G. Broza ◽

U. Rieck ◽

A. Jaballah ◽

A. Kawaguchi

Keyword(s):

Mechanical Tests ◽

Polymer Materials ◽

Ionic Crystals ◽

Structure Property ◽

Polymer Systems ◽

Structure Property Relationships ◽

Oriented Films ◽

Materials Used ◽

Polymer Laminates ◽

Heated Glass

Oriented overgrowth of polymer materials onto ionic crystals is well known and recently it was demonstrated that this epitaxial crystallisation can also occur in polymer/polymer systems, under certain conditions. The morphologies and the resulting physical properties of such systems will be presented, especially the influence of epitaxial interfaces on the adhesion of polymer laminates and the mechanical properties of epitaxially crystallized sandwiched layers.Materials used were polyethylene, PE, Lupolen 6021 DX (HDPE) and 1810 D (LDPE) from BASF AG; polypropylene, PP, (PPN) provided by Höchst AG and polybutene-1, PB-1, Vestolen BT from Chemische Werke Hüls. Thin oriented films were prepared according to the method of Petermann and Gohil, by winding up two different polymer films from two separately heated glass-plates simultaneously with the help of a motor driven cylinder. One double layer was used for TEM investigations, while about 1000 sandwiched layers were taken for mechanical tests.

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