Superhard nanocomposite coatings. From basic science toward industrialization

Vepřek, S.; Jílek, Mojmír

doi:10.1351/pac200274030475

Cited by 50 publications

(17 citation statements)

References 18 publications

(55 reference statements)

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“…Secara umum struktur kristal TiAlN adalah kristal kubus pusat muka (fase (Ti,Al)N) dan heksagonal (fase AlN) [4]. Pencapaian tertinggi sifat kekerasan lapisan logam transisi nitrida diperoleh melalui pembentukan lapisan super dan ultra keras (TiAl)N/Si3N4 dengan nilai kekerasan mendekati kekerasan intan dengan kestabilan termal hingga suhu 1200 0 C [5,6]. Nilai kekerasan lapisan TiAlN secara umum bersumber dari tegangan kompresif sisa yang akan berkurang saat lapisan diaplikasikan pada suhu tinggi.…”

Section: Senyawa Nitridaunclassified

“…Hal ini terjadi melalui mekanisme segregasi fase secara termodinamika yang membawa pembentukan struktur nano secara spontan [6,11]. Struktur nano yang terbentuk adalah butir kristal nitrida (TiAlN) dikelilingi oleh matrik nitrida amorf (Si3N4) [12].…”

Section: Senyawa Nitridaunclassified

“…Segregasi fase spontan tanpa melibatkan pengintian fase lain mengakibatkan terbentuknya komposit nano melalui pengaturan sendiri dengan ukuran kristal ditentukan kesetimbangan antara penurunan energi bebas akibat segreasi fase, penurunan sifat kimiawi serta regangan tak koheren antarmuka. Komposit nano yang terbentuk, stabil terhadap pertumbuhan butir pada suhu tinggi [6].…”

Section: Senyawa Nitridaunclassified

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Potensi Pembentukan Lapisan Super Dan Ultra Keras Senyawa Komposit Nitrida Menggunakan Kaidah Elektrodeposisi

Budi

2016

SPEKTRA

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metal (Ni) is used as a matrix because good corrosion resistance properties. The composition, morphology, crystal structure, and the corrosion resistance of composite layer are affected by electrodeposition parameters such as electrodeposition current and the concentration of particles TiN and AlN. The formation of the composite layer Ni-TiAlN/Si3N4 using electrodeposition methode potentially resulting super and ultra hard nitride composite layer.

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Section: Senyawa Nitridaunclassified

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Potensi Pembentukan Lapisan Super Dan Ultra Keras Senyawa Komposit Nitrida Menggunakan Kaidah Elektrodeposisi

Budi

2016

SPEKTRA

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“…Due to its interesting chemical and mechanical properties, titanium alloy is widely used in many applications [14]. One particular alloy, the Ti6Al4V, has the best performance among the dierent grades of titanium.…”

Section: Introductionmentioning

confidence: 99%

Characterization of TiAlV Films Prepared by Vacuum Arc Deposition: Effect of Substrate Temperature

2013

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Three TiAlV lms have been prepared by vacuum arc discharge technique at dierent substrate temperatures (50, 300, and 400• C). The depositions were carried out from aluminum, vanadium and titanium elemental targets. The temperature eects on the crystalline quality and texture have been investigated by means of X-ray diraction. Two phases have been identied and the grain size has been found to increase with temperature. The composition of the lms has been determined by proton induced X-ray emission technique. The Ti ratio was found to increase with temperature. The microhardness, measured by the Vickers indentation method was found to decrease with temperature. X-ray photoelectron spectroscopy was used to study the chemical composition of the passive layer formed on the lms by analyzing high resolution spectra of Al 2p, Ti 2p and V 2p. This layer was mainly composed of TiO2 with a small participation of other oxidation and metallic states of Ti, Al and V.

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confidence: 99%

Microstructure and Related Properties of Nanocomposites for Tribomedical Applications

Filip¹,

Aouadi²

2005

MAM

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It has recently been established that nanocomposite thin films are promising materials for applications as wear-resistant protective coatings [1][2][3]. These films consist of two or more nanocrystals embedded in an amorphous or nanocrystalline matrix. When optimized, the mechanical and tribological properties of these structures are far superior to their constituent phases. First, these materials are harder due to the hindering of dislocation motion at interfaces. Second, they are tougher since their architecture favors the hindering of crack development and propagation and enhances ductility by grain boundary sliding [4]. Finally, their properties may be tailored by selecting appropriate phases and volume fractions for specific applications.ZrN/M (where M = Ag, Au, or Pd) thin films were prepared by unbalanced magnetron DC sputtering on polished Si (100) wafers. The list of prepared samples and the corresponding deposition conditions for the ZrN/Ag system are listed in Table 1. This material was selected because of its superior mechanical properties compared to the ZrN/Au and ZrN/Pd sytems. The structure of zirconium nitride as determined by X-ray diffraction changed substantially with the addition of M as shown in Fig. 1 for the ZrN/Ag system. These observations suggest that the deposits consisted of a nanocomposite structure that comprised separate ZrN and Ag phases. Bright field TEM micrographs for sample S2 containing 12 % Ag (Fig. 2) illustrated nanometric Ag precipitates (dark particles) embedded in a ZrN matrix (light). The atomic concentrations of Ag, Zr, and N were estimated using the areas under the Ag 3d , Zr 3d , and N 1s peaks of the detected X-Ray Photoelectron Spectra, and the silver content is summarized in Table 1. Figure 3 shows the ZrN/Ag deposit hardness and elastic modulus as a function of silver content. The hardness of the deposit increased gradually with the increase in Ag content to a maximum value of 32 GPa when Ag content reached 12%. Further addition of Ag resulted in a decrease of hardness. Figure 4 shows the H 3 /E 2 ratio as a function of silver content. This ratio reflects the resistance of material to plastic deformation during contact events [2]. The highest H 3 /E 2 ratio is obtained for sample S2. The resistance to plastic deformation was optimized for the three sets of materials and was found to depend on the choice of the metallic element (Ag being the best). These findings were attributed to the bonding mechanism at the interface between the ceramic nanocrystals and the metallic matrix as shown using ab-initio calculations using density functional theory calculations.

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Superhard nanocomposite coatings. From basic science toward industrialization

Cited by 50 publications

References 18 publications

Potensi Pembentukan Lapisan Super Dan Ultra Keras Senyawa Komposit Nitrida Menggunakan Kaidah Elektrodeposisi

Potensi Pembentukan Lapisan Super Dan Ultra Keras Senyawa Komposit Nitrida Menggunakan Kaidah Elektrodeposisi

Characterization of TiAlV Films Prepared by Vacuum Arc Deposition: Effect of Substrate Temperature

Microstructure and Related Properties of Nanocomposites for Tribomedical Applications

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