The Experts below are selected from a list of 28896 Experts worldwide ranked by ideXlab platform
K.-t. Rie - One of the best experts on this subject based on the ideXlab platform.
-
Wear-resistant PACVD coatings of the system Ti-B-N
Surface and Coatings Technology, 1999Co-Authors: C. Pfohl, K.-t. RieAbstract:Abstract The nitrides and borides of titanium are well known for their high Hardness and excellent corrosion and wear resistance in many tribological systems. Titanium boronitrides are expected to combine the advantages of both binary Layers and allow optimization for the demands of each specific application. This study focuses on the influence of the process gas composition as well as the plasma parameters on the properties of PACVD coatings within the system Ti–B–N. The stoichiometry can be controlled by the process-gas composition. The Layer growth rate increases with increasing N 2 flow. For a fixed gas composition, it can be related to the supply of active Layer-forming species. A high Layer Hardness is obtained at high ion energies and increases with decreasing N 2 flow. At a constant N 2 flow, Layers with low boron contents reach a Hardness of up to 4000 HK0.005, whereas Ti(B,N) with B concentrations above 20 at.% exhibits a lower Hardness than that of TiN.
A. K. Sharma - One of the best experts on this subject based on the ideXlab platform.
-
The Hardnesses and elastic moduli of pulsed laser deposited multiLayer AlN/TiN thin films
Composites Part B: Engineering, 1999Co-Authors: T. A. Rawdanowicz, V. Godbole, Jagdish Narayan, Jag Sankar, A. K. SharmaAbstract:Abstract The Hardnesses and elastic moduli of multiple aluminum nitride (AlN) and titanium nitride (TiN) thin film biLayers of various periodicities deposited on silicon (111) and sapphire (0001) were investigated using nanoindentation based on a continuous stiffness measurement technique. Multiple biLayer thin films of AlN/TiN were grown by the pulsed laser deposition method. X-ray diffraction analysis revealed that the deposited thin films were highly textured polycrystalline oriented along the [0001] and [111] axes for aluminum nitride and titanium nitride, respectively. The AlN/TiN multiple Layer Hardness measurements ranged from 18 to 23 GPa, compared to single component film Hardnesses of 34 and 24 GPa for TiN and AlN, respectively. The elastic moduli measured were 290–340 and 275–290 GPa for multiple Layer AlN/TiN thin films deposited on sapphire (0001) and silicon (111), respectively.
C. Pfohl - One of the best experts on this subject based on the ideXlab platform.
-
Wear-resistant PACVD coatings of the system Ti-B-N
Surface and Coatings Technology, 1999Co-Authors: C. Pfohl, K.-t. RieAbstract:Abstract The nitrides and borides of titanium are well known for their high Hardness and excellent corrosion and wear resistance in many tribological systems. Titanium boronitrides are expected to combine the advantages of both binary Layers and allow optimization for the demands of each specific application. This study focuses on the influence of the process gas composition as well as the plasma parameters on the properties of PACVD coatings within the system Ti–B–N. The stoichiometry can be controlled by the process-gas composition. The Layer growth rate increases with increasing N 2 flow. For a fixed gas composition, it can be related to the supply of active Layer-forming species. A high Layer Hardness is obtained at high ion energies and increases with decreasing N 2 flow. At a constant N 2 flow, Layers with low boron contents reach a Hardness of up to 4000 HK0.005, whereas Ti(B,N) with B concentrations above 20 at.% exhibits a lower Hardness than that of TiN.
Yang Xiao - One of the best experts on this subject based on the ideXlab platform.
-
Effect of surface mechanical attrition treatment on microstructures and mechanical properties of 316L stainless steel
Transactions of Materials and Heat Treatment, 2007Co-Authors: Yang XiaoAbstract:Nanostructure surface Layer in 316L stainless steel sheet(2.8mm thick)was induced by surface mechanical attrition treatment(SMAT).The thickness of nanostructure surface Layer increased from 50μm to 150μm when the SMAT time increased from 5min to 60min.The mechanical properties of the SMAT 316L stainless steel sheet were measured and the tensile fracture surface was observed by SEM.The results show that the surface Layer Hardness and bulk yield strength of the steel sheet increase obviously when the SMAT time is 5 minutes,however,no such increasing is observed for continuously increasing SMAT time.The tensile fracture morphology of nanostructure surface Layer of the steel sheet SMAT for 5 minutes shows elongated dimples and increased shear lip area.The plastic deformation capability decreases with the continuously increasing SMAT time.
-
Effect of surface mechanical attrition treatment on microstructures and mechanical properties of 316L stainless steel
Transactions of Materials and Heat Treatment, 2007Co-Authors: Yang XiaoAbstract:Nanostructure surface Layer in 316L stainless steel sheet(2.8mm thick)was induced by surface mechanical attrition treatment(SMAT).The thickness of nanostructure surface Layer increased from 50μm to 150μm when the SMAT time increased from 5min to 60min.The mechanical properties of the SMAT 316L stainless steel sheet were measured and the tensile fracture surface was observed by SEM.The results show that the surface Layer Hardness and bulk yield strength of the steel sheet increase obviously when the SMAT time is 5 minutes,however,no such increasing is observed for continuously increasing SMAT time.The tensile fracture morphology of nanostructure surface Layer of the steel sheet SMAT for 5 minutes shows elongated dimples and increased shear lip area.The plastic deformation capability decreases with the continuously increasing SMAT time.
B. Arnold - One of the best experts on this subject based on the ideXlab platform.
-
Influence of the PACVD process parameters on the properties of titanium carbide thin films
Surface and Coatings Technology, 1998Co-Authors: C. Jarms, H.-r. Stock, H. Berndt, K. Bartsch, Albrecht Leonhardt, B. ArnoldAbstract:Abstract Wear-resistant titanium carbide (TiC) coatings were deposited by plasma-assisted chemical vapour deposition on high-speed steel. The influence of the partial pressure ratio of methane and titanium tetrachloride ( p CH 4 / p TiCl 4 ), the plasma voltage and the pulse/pause ratio on the composition and properties of the TiC coatings have been investigated. Small partial pressure ratios p CH 4 / p TiCl 4 up to about 15 result in nearly stoichiometric TiC coatings at high plasma voltage. Higher partial pressure ratios cause excess carbon, which is bound as C-C or C-H. An increasing carbon content was found also for both increasing plasma voltage and increasing pulse/pause ratio. The Layer Hardness was found to decrease with increasing excess carbon. No significant influence of composition on the friction coefficient has been detected.