Study on the Fabrication and Cutting Performance of HFCVD Diamond Coated Silicon Nitride Inserts

2010 ◽  
Vol 431-432 ◽  
pp. 515-518
Author(s):  
Guo Dong Yang ◽  
Bin Shen ◽  
Fang Hong Sun ◽  
Zhi Ming Zhang ◽  
Ming Chen
Keyword(s):  
Silicon Nitride ◽  
Chemical Vapor ◽  
Cutting Performance ◽  
Work Piece ◽  
X Ray Diffraction ◽  
Fine Grained ◽  
Reinforced Plastics ◽  
Glass Fiber Reinforced ◽  
Fiber Reinforced Plastics ◽  
Hot Filament

Microcrystalline diamond (MCD) and fine-grained diamond (FGD) films are deposited on silicon nitride (Si3N4) inserts using the hot filament chemical vapor deposition (HFCVD) method. Scanning electron microscope (SEM), X –ray diffraction (XRD) and Raman spectrum are employed to characterize these as-deposited diamond films. Cutting performance of as-fabricated CVD diamond coated Si3N4 inserts is examined in dry turning glass fiber reinforced plastics (GFRP) material, comparing with the uncoated Si3N4 inserts. The results indicate that the tool failure is mainly attributed to its severe flank wear, which is caused by continuous friction and impact brought by many hard SiO2 particles distributed in the GFPR work piece. The lifetime of Si3N4 inserts can be prolonged by depositing MCD or FGD films on them and the FGD coated insert shows better wear resistance than the MCD coated one.

Improvement on the Cutting Performance of CVD Diamond Coated Drills in Drilling CFRP

2012 ◽  
Vol 499 ◽  
pp. 366-371 ◽  
Author(s):  
Jian Guo Zhang ◽  
Ben Wang ◽  
Fang Hong Sun ◽  
Hang Gao
Keyword(s):  
Thermal Conductivity ◽  
Wear Resistance ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Cutting Performance ◽  
Reinforced Plastics ◽  
Coated Tool ◽  
Hot Filament

Carbon fiber reinforced plastics (CFRP) is difficult to machine because of the extremely abrasive nature of the carbon fibers and its low thermal conductivity. CVD diamond films have many excellent properties such as wonderful wear resistance, high thermal conductivity and low friction coefficient, therefore depositing diamond films on the surface of drills is thought to be an effective way to elongate the lifetime of drills and improve the cutting performance. In this study, diamond films are deposited on the WC-Co drill using hot filament chemical vapor deposition (HFCVD) method. The results of characterization by the scanning electron microscope (SEM) and Raman spectrum indicate that the fabricated CVD diamond coated drill is covered with a layer of uniform and high-purity diamond films. The cutting performance of as-fabricated CVD diamond coated drill is evaluated in dry drilling CFRP, comparing with the uncoated WC-Co drill. The results demonstrate that the CVD diamond coated drill exhibits much stronger wear resistance. Its flank wear is about 50μm after drilling 30 holes, about one-third of that of WC-Co drill. Machining quality of the exit and internal wall of drilled holes shows better surface finish obtained by coated drill, which suggests that CVD diamond coated tool has great advantages in drilling CFRP.

Characterization of Epoxy Composites with TiO2 Additives and E-Glass Fibers as Reinforcement Agent

2016 ◽  
Vol 40 ◽  
pp. 99-104 ◽  
Author(s):  
S. Nallusamy
Keyword(s):  
Glass Fibers ◽  
Research Work ◽  
Flexural Properties ◽  
X Ray Diffraction ◽  
Reinforced Plastics ◽  
Matrix Cracks ◽  
Glass Fiber Reinforced ◽  
Reinforced Fiber ◽  
Fiber Reinforced Plastics

Nanotechnology has become one of the best ever growing technology in scientific and engineering disciplines. Various investigations on nanoparticles have been carried out by many research scholars in the earlier decades. This research work investigates the effect of hybrid e-glass reinforced fiber with epoxy nanocomposite. The nanocomposite laminates were prepared by hand layup technique by varying percentages of Titanium Dioxide (TiO2) nanoparticles of 0, 1, 2 and 3% respectively. The nano additives are added to improve the strength, from wear out resistance and hardness of the polymer composite. The nanocomposite laminates thus prepared are characterized by X-ray diffraction (XRD) and Scanning Electron Microscope (SEM) tests. The XRD test revealed that the nanoparticles are well typified and a fully intercalated structure was obtained. By using SEM the fracture failures and matrix cracks on the surfaces of the laminates were investigated. The flexural properties of the glass fiber reinforced plastics improved with the addition of nano TiO2 filler particles. At 3 wt % of TiO2 the flexural strength of 203.36 Mpa was attained. Good interfacial bonding between the fiber and epoxy was the main reason for achieving better flexural properties.

Effect of Argon during Diamond Deposition by Hot Filament Chemical Vapor Deposition

2016 ◽  
Vol 869 ◽  
pp. 721-726 ◽  
Author(s):  
Divani C. Barbosa ◽  
Ursula Andréia Mengui ◽  
Mauricio R. Baldan ◽  
Vladimir J. Trava-Airoldi ◽  
Evaldo José Corat
Keyword(s):  
Growth Rate ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Diamond Growth ◽  
Gas Mixture ◽  
X Ray Diffraction ◽  
Hot Filament ◽  
Argon Content

The effect of argon content upon the growth rate and the properties of diamond thin films grown with different grains sizes are explored. An argon-free and argon-rich gas mixture of methane and hydrogen is used in a hot filament chemical vapor deposition reactor. Characterization of the films is accomplished by scanning electron microscopy, Raman spectroscopy and high-resolution x-ray diffraction. An extensive comparison of the growth rate values and films morphologies obtained in this study with those found in the literature suggests that there are distinct common trends for microcrystalline and nanocrystalline diamond growth, despite a large variation in the gas mixture composition. Included is a discussion of the possible reasons for these observations.

scholarly journals Optical properties of silicon nitride films deposited by hot filament chemical vapor deposition

1995 ◽  
Vol 77 (12) ◽  
pp. 6534-6541 ◽  
Author(s):  
Sadanand V. Deshpande ◽  
Erdogan Gulari ◽  
Steven W. Brown ◽  
Stephen C. Rand
Keyword(s):  
Optical Properties ◽  
Chemical Vapor Deposition ◽  
Silicon Nitride ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Silicon Nitride Films ◽  
Hot Filament

Comparative Studies on the Cutting Performance of CVD Diamond and DLC Coated Inserts in Turning GFRP Composite Materials

2010 ◽  
Vol 431-432 ◽  
pp. 466-469
Author(s):  
Dong Can Zhang ◽  
Bin Shen ◽  
Fang Hong Sun ◽  
Ming Chen ◽  
Zhi Ming Zhang
Keyword(s):  
Composite Materials ◽  
Flank Wear ◽  
Arc Discharge ◽  
Cutting Tools ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Cutting Performance ◽  
Vacuum Arc ◽  
Reinforced Plastics ◽  
Gfrp Composite

The diamond and diamond-like carbon (DLC) films were deposited on the cobalt cemented tungsten carbide (WC-Co) cutting tools respectively adopting the hot filament chemical vapor deposition (HFCVD) technique and the vacuum arc discharge with a graphite cathode. The scanning electron microscope (SEM), X-ray diffraction spectroscopy (XRD) and Raman spectroscopy were used to characterize the as-deposited diamond and DLC films. To evaluate their cutting performance, comparative turning tests were conducted using the uncoated WC-Co and as-fabricated CVD diamond and DLC coated inserts, with glass fiber reinforced plastics (GFRP) composite materials as the workpiece. The research results exhibited that diamond and DLC coated inserts had great advantages in cutting tests compared to uncoated insert. The flank wear of the CVD diamond coated insert maintained a very low value about 50μm before the cutting tool failure occurred. For the DLC coated insert, its flank wear always maintained a nearly constant value of 70~200μm during whole 45 minutes turning process. The flank wear of CVD diamond coated insert was lower than that of DLC coated insert before diamond films peeling off.

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