Deposition of Diamond Films on Smooth Surfaces of Cemented Carbide Inserts with Cobalt Boride Interlayers

2006 ◽  
Vol 315-316 ◽  
pp. 205-209
Author(s):  
Y. Wang ◽  
Y.P. Ma ◽  
Fang Hong Sun ◽  
Zhi Ming Zhang ◽  
Ming Chen
Keyword(s):  
Surface Roughness ◽  
Diamond Films ◽  
Fold Increase ◽  
Cemented Carbide ◽  
Widespread Application ◽  
Coated Tools ◽  
Key Factor ◽  
Cobalt Boride ◽  
Carbide Inserts ◽  
Cemented Carbide Inserts

Improving adhesion and surface roughness of diamond films on WC–Co substrate is the key factor of the widespread application of diamond coated tools. A new pretreatment method has been performed for smooth Co-cemented carbide inserts in order to lower the surface roughness of diamond films under the premise of good adhesion between diamond films and substrates. The effect of the new pretreatment on the adhesion of the diamond films is investigated. Research results show that the boronization pretreatment can effectively suppress cobalt diffusion to the surface and avoid catalytic effect of Co at high temperature. This new pretreatment can avoid the surface roughening of inserts and ensure the deposition of smooth diamond films. Investigation shows that the optimum boronization compounding is a powder mixture of 70%B4C+15.5%KBF4+1.5% La2O3+13%Na2CO3. Adhesion between substrates and diamond films is evaluated by Rockwell A indentation tests and the cutting performance of the diamond-coated tools is investigated by the cutting tests. Diamond films on smooth cemented carbide inserts with cobalt boride interlayer have high adhesive strength and low surface roughness. Diamond-coated tools with boronization pretreatment have a 5-fold increase in tool life compared with untreated ones.

scholarly journals Surface roughness characterization of stainless steel after laser assisted machining

Mechanik ◽  
2019 ◽  
Vol 92 (12) ◽  
pp. 827-829 ◽  
Author(s):  
Agata Felusiak ◽  
Martyna Wiciak-Pikuła ◽  
Tadeusz Chwalczuk ◽  
Piotr Kieruj ◽  
Paweł Twardowski
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Cutting Parameters ◽  
Cemented Carbide ◽  
Roughness Parameters ◽  
Laser Assisted Machining ◽  
Carbide Inserts ◽  
Cemented Carbide Inserts

The paper presents the analysis of the influence of laser assisted machining (LAM) on various parameters of surface roughness of stainless steel. The tests were carried out for cemented carbide inserts with varying cutting parameters. In most cases, a significant reduction in the roughness parameters was observed using LAM.

scholarly journals Improvement of the Interfacial Fatigue Strength and Milling Behavior of Diamond Coated Tools via Appropriate Annealing

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 821 ◽  
Author(s):  
Georgios Skordaris ◽  
Tilemachos Kotsanis ◽  
Apostolos Boumpakis ◽  
Fani Stergioudi
Keyword(s):  
Fatigue Strength ◽  
Residual Stresses ◽  
Impact Load ◽  
Film Structure ◽  
Cemented Carbide ◽  
Diamond Coatings ◽  
Coated Tools ◽  
The Impact ◽  
Carbide Inserts ◽  
Cemented Carbide Inserts

This article deals with the potential to reduce the amount of the residual stresses in the diamond films on cemented carbide inserts for improving their effective interfacial fatigue strength and thus their wear resistance. In this context, nano-crystalline diamond coatings (NCD) were deposited on cemented carbide inserts. A portion of these coated tools were annealed in vacuum for decreasing the amount of residual stresses in the film structure. The annealing temperature was appropriately selected for keeping the substrate strength properties invariable after the coating annealing. Inclined impact tests at ambient temperature on the untreated and heat-treated diamond coated tools were conducted for evaluating their effective interfacial fatigue strength. Depending upon the impact load, after a certain number of impacts, damages in the film-substrate interface develop, resulting in coating detachment and lifting. Via appropriate FEM (Finite Element Method)-evaluation of the impact imprints, the residual stresses in the diamond film structure were determined. Milling experiments were conducted for evaluating the cutting performance of the coated tools using aluminum foam as workpiece material. A correlation between the interfacial fatigue strength of diamond coatings and their residual stresses affected by annealings contributed to the explanation of the attained cutting results.

The Effect of Substrate Surface Characteristics on AIP PVD Coating of Cemented Carbide Inserts and Their Cutting Performance

2007 ◽  
Vol 534-536 ◽  
pp. 1241-1244 ◽  
Author(s):  
Dong Gil Ahn ◽  
Kern Woo Lee ◽  
Joo Wan Lee ◽  
Moshe Sharon
Keyword(s):  
Surface Roughness ◽  
Surface Treatment ◽  
Substrate Surface ◽  
Surface Characteristics ◽  
Cutting Performance ◽  
Cemented Carbide ◽  
Physical Treatment ◽  
Pvd Coating ◽  
Carbide Inserts ◽  
Cemented Carbide Inserts

The effects of substrate surface treatment on TiAlN PVD coating on submicron cemented carbide was investigated. Surface roughness and morphology were improved by physical treatment such as micro blasting, brush lapping and plasma etching with decreased Co content in the surface layer. The Co content in the surface does not seem to affect coating adhesion or the quality considerably. The smoother surface induced by the surface treatment improved TiAlN adhesion and surface roughness. The insert treated by blasting and lapping before coating showed a better cutting performance than those with ultrasonic treatment. It was concluded that the substrate surface characteristics are closely related to the performance of the TiAlN coated inserts.

Tribological Influences of TiAlN Coating on Tool Wear for High-Speed Dry and Wet Machining of Steels

2004 ◽  
Author(s):  
Y. J. Lin ◽  
Samir A. Khrais
Keyword(s):  
High Speed ◽  
High Speed Machining ◽  
Structural Variations ◽  
Edge Chipping ◽  
Coated Tools ◽  
Coated Tool ◽  
Carbide Inserts ◽  
Turning Test ◽  
Cemented Carbide Inserts ◽  
Cutting Speeds

The tribological influences of PVD-applied TiAlN coatings on the wear of cemented carbide inserts and the microstructure wear behaviors of the coated tools under dry and wet machining are investigated. The turning test was conducted with variable high cutting speeds ranging from 210 m/min to 410m/min. The analyses based on the experimental results lead to strong evidences that conventional coolant has a retarded effect on TiAlN coatings under high-speed machining. Microwear mechanisms identified in the tests through SEM micrographs include edge chipping, micro-abrasion, micro-fatigue, micro-thermal, and micro-attrition. These micro-structural variations of coatings provide structure-physical alterations as the measures for wear alert of TiAlN coated tool inserts under high speed machining of steels.

CVD of Alternated MCD and NCD Films on Cemented Carbide Inserts

2011 ◽  
pp. 369-382
Author(s):  
Raonei Alves Campos ◽  
Andre Contin ◽  
Vladimir Jesus Trava-Airoldi ◽  
Danilo Maciel Barquete ◽  
Evaldo José Corat
Keyword(s):  
Cemented Carbide ◽  
Carbide Inserts ◽  
Cemented Carbide Inserts
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