Microstructure and phase composition evolution of nano-crystalline carbon films: Dependence on deposition temperature

2002 ◽  
Vol 91 (5) ◽  
pp. 3336-3344 ◽  
Author(s):  
A. Hoffman ◽  
A. Heiman ◽  
H. P. Strunk ◽  
S. H. Christiansen
Keyword(s):  
Phase Composition ◽  
Deposition Temperature ◽  
Carbon Films ◽  
Nano Crystalline

scholarly journals Reactive High-Power Impulse Magnetron Sputtering of Chromium-Carbon Films

Coatings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1269
Author(s):  
Chin-Chiuan Kuo ◽  
Chun-Hui Lin ◽  
Jing-Tang Chang ◽  
Yu-Tse Lin
Keyword(s):  
Magnetron Sputtering ◽  
Amorphous Carbon ◽  
High Power ◽  
Deposition Temperature ◽  
Average Power ◽  
Carbon Films ◽  
Strengthening Effect ◽  
Substrate Bias ◽  
Hydrogenated Amorphous Carbon ◽  
Hydrogenated Amorphous

Chromium-carbon films were deposited by utilizing reactive high-power impulse magnetron sputtering at different mixture ratios of ethyne and argon atmosphere, and different substrate bias voltages and deposition temperature, with the same pulse frequency, duty cycle, and average power. The microstructure and mechanical properties of the obtained films were compared. The films consist of amorphous or nanocrystalline chromium carbide, hydrogenated amorphous carbon, and minor α-chromium phase. Decreasing the fraction of ethyne increases the content of the α-chromium phase but decreases hydrogenated amorphous carbon phase. The film’s hardness increases by enhancing the negative substrate bias and raising the deposition temperature, which could be attributed to the increase of film density and the Hall–Petch strengthening effect induced by the nanoscale crystallization of the amorphous carbide phase.

Nano-Crystalline Barium Hexaferrite Powders Prepared by Mechanical Alloying Using Acetate Precursor

2008 ◽  
Vol 368-372 ◽  
pp. 610-612 ◽  
Author(s):  
M. Honarvar Nazari ◽  
Abolghasem Ataie ◽  
S.A. Seyyed Ebrahimi
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Phase Composition ◽  
Mechanical Alloying ◽  
Thermal Behavior ◽  
Crystallite Size ◽  
Barium Hexaferrite ◽  
Subsequent Heat Treatment ◽  
Molar Ratios ◽  
Nano Crystalline

Nano-crystalline barium hexaferrite powders have been prepared by mechanical alloying of nFe2O3+Ba(CH3COO)2 with Fe/Ba molar ratios of 10-12 and subsequent heat treatment. Thermal behavior, phase composition, morphology and magnetic properties of samples were studied using DTA/TGA, XRD, SEM and VSM, respectively. Nano-crystalline Ba-hexaferrite with a mean crystallite size of 46 nm and magnetic properties as high as Ms = 73.9 A.m2/kg and Hci = 334.2 kA/m was formed for mixture of 5.5Fe2O3+Ba(CH3COO)2 which was milled for 48 h and then annealed at 1100 °C.

Formation of structural parameters and mechanical properties of multi-element coatings based on niobium nitride under different deposition conditions

2021 ◽  
pp. 67-72
Author(s):  
V.P. Tabakov ◽  
A.V. Chikhranov ◽  
Ya.A. Dolzhenko
Keyword(s):  
Mechanical Properties ◽  
Phase Composition ◽  
Chemical Composition ◽  
Deposition Temperature ◽  
Chemical Elements ◽  
Structural Parameters ◽  
Niobium Nitride ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Deposition Conditions

The results of the dependence of the chemical composition of coatings based on niobium nitride on the layout of the installation are presented. The effect of the chemical elements content in coatings based on niobium nitride on the phase composition, structural parameters and mechanical properties is determined. The effect of the deposition temperature of coatings on the mechanical properties of wear-resistant coatings is studied.

Evaluation Methods of Cohesive Strength of Coatings

2020 ◽  
Vol 992 ◽  
pp. 1006-1010
Author(s):  
V.E. Arkhipov ◽  
M.S. Pugachev
Keyword(s):  
Phase Composition ◽  
Deposition Temperature ◽  
High Reliability ◽  
Metal Layer ◽  
Aluminum Coating ◽  
Cohesive Strength ◽  
Test Results ◽  
Technological Parameters ◽  
Sharp Drop ◽  
Gas Dynamic

Based on the test results of the coatings applied by gas-dynamic deposition, the paper evaluates the possibility of using the “pin” and “ring separation” methods to examine the cohesive strength of coatings on tensile test. There is a limitation of the “pin” method application for coatings with porosity due to a significant scatter in results (≤50%). Using the method of the “ring separation” with a high reliability of the results (scatter ≤5%) makes it possible to evaluate the effect of technological parameters of deposition, as well as changes in the phase composition of the coating on cohesion. For example, the cohesive strength of the aluminum coating decreases from ≈180 MPa to ≈50 MPa with rising deposition temperature from 180°C to 540°C; a sharp drop in cohesion of the applied metal layer from 78 MPa to 44 MPa is observed for the coating based on copper and zinc particles on formation of βʹ - and γ phases.

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