Mirror-Like Surface Finishing of PCD by Fixed Abrasive Polishing

2016 ◽  
Vol 874 ◽  
pp. 139-144
Author(s):  
Keishi Yamaguchi ◽  
Minoru Ota ◽  
Kai Egashira ◽  
Hirotaka Miwa ◽  
Yoshiaki Onchi ◽  
...  
Keyword(s):  
Polycrystalline Diamond ◽  
High Hardness ◽  
Machining Process ◽  
Surface Finishing ◽  
High Wear Resistance ◽  
Low Friction ◽  
High Chemical ◽  
Mechanical Parts ◽  
Chemical Inertness ◽  
Fixed Abrasive

Polycrystalline diamond (PCD) has excellent properties such as high hardness, high chemical inertness, high wear resistance and a low friction coefficient. Thus, it has been expected to be applied to used in various mechanical parts such as sliding parts. However, diamond is difficult to machine owing to its high hardness and chemical inertness. Therefore, a highly efficient and high-quality machining process is required for PCD. In this study, the authors developed fixed abrasive polishing tools for the mirror-like surface finishing of PCD that contain mechanochemical abrasive grains with diamond grains. As a result of fixed abrasive polishing experiments, it was clarified that a mirror-like surface can be obtained by fixed abrasive polishing using a tool containing SiO2 and diamond abrasives. Moreover, it was found that the removal efficiency can be increased under a high-temperature condition.

Progress on Research of Machining of Difficult-to-Machine Materials Using CBN Cutting Tools

2015 ◽  
Vol 723 ◽  
pp. 910-913
Author(s):  
Shi Long Gao ◽  
Li Bao An ◽  
Xiao Chong Wang ◽  
Song Gao
Keyword(s):  
Metal Cutting ◽  
Cutting Tool ◽  
Cubic Boron Nitride ◽  
Cutting Tools ◽  
High Hardness ◽  
High Wear Resistance ◽  
High Chemical ◽  
Tool Materials ◽  
Chemical Inertness ◽  
Cutting Tool Materials

Some engineering materials have excellent performances, but the machining of these materials is a problem. It is very inadequate to meet machining requirement only using traditional cutting tool materials. Therefore, exploring the machinability of difficult-to-machine materials and applying appropriate cutting tool materials have drawn much attention in metal cutting industry for guarantied product quality and productivity. Cubic boron nitride (CBN) has been recognized as one of the most suitable cutting tool materials due to its high hardness, high wear resistance, high chemical inertness, and excellent chemical stability in high temperature. Research on various aspects of CBN cutting performances has been conducted in recent years. This paper presents the progress on machining difficult-to-machine materials using CBN cutting tools.

Precision Coating of ta-C Films on Quartz Surfaces

2020 ◽  
Author(s):  
Kotaro Kawai ◽  
Yuki Hirata ◽  
Hiroki Akasaka ◽  
Naoto Ohtake
Keyword(s):  
Cutting Tools ◽  
Three Dimensional ◽  
High Hardness ◽  
Carbon Films ◽  
Vacuum Arc ◽  
High Wear Resistance ◽  
Chemical Inertness ◽  
Filtered Cathodic Vacuum Arc ◽  
Surface Morphologies

Abstract Diamond-like carbon (DLC) films have excellent properties such as high hardness, low friction coefficient, high wear resistance, chemical inertness and so on. Because DLC film is considered as an effective coating material to improve their surface properties, this films are used in various applications such as parts for automobiles engines, hard disk surfaces, cutting tools and dies, and so on. DLC films consist of a mixture of sp2 bonded carbon atoms and sp3 bonded carbon atoms. Among them, ta-C film is known as the hardest and strongest film since it mainly consists of sp3 bonded carbon atoms. One of deposition methods to form ta-C is Filtered Cathodic Vacuum Arc (FCVA). The characteristic of this method is that it is possible to remove the droplets and form a high-quality film.. However, even though lots of mechanical components which require ta-C coating have three-dimensionally shapes, it is difficult to coat ta-C film three dimensionally by using FCVA process. At present, researches on 3D deposition of amorphous carbon films on three dimensional components is still insufficient, and investigation reports on the deposition mechanism and characterization of the deposited films are even more limited. In this study, we tried to deposit films on 3D components by the FCVA method and evaluated the microstructure and surface morphologies of films. Although films were coated successfully in the entire surfaces, different properties were showed depending on the location of components. These properties were investigated by Raman spectroscopy and laser microscope.

Cutting Performances of Nano-Polycrystalline Diamond

2012 ◽  
Vol 523-524 ◽  
pp. 105-108
Author(s):  
Katsuko Harano ◽  
Hitoshi Sumiya ◽  
Daisuke Murakami
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Cutting Tools ◽  
Polycrystalline Diamond ◽  
High Hardness ◽  
Direct Conversion ◽  
High Wear Resistance ◽  
Single Crystal Diamond ◽  
Anisotropic Mechanical Properties ◽  
Hard And Brittle Materials

Single-phase (binder-less) nano-polycrystalline diamond (NPD) has been synthesized by direct conversion sintering from graphite under high pressure and high temperature. NPD is characterized by extremely high hardness compared with single crystal diamond (SCD), even at high temperature. In addition, NPD has high wear resistance, no anisotropic mechanical properties, no cleavages, and high thermal stability. These characteristics suggest that NPD has high potential for use in precision cutting tools for various hard works. In order to evaluate the cutting performance of NPD, cutting tests for various cemented carbides were conducted under various conditions and the results compared with those of single crystal diamond (SCD) and conventional polycrystalline diamond containing metal binder (PCD). The results revealed that NPD has outstanding potential for precision cutting and processing of diverse hard and brittle materials.

Adherence Study of Diamond-Like Carbon Films Deposited on X45 CrSi 9-3 Steel with a Silicon Interlayer

2014 ◽  
Vol 802 ◽  
pp. 642-647
Author(s):  
Lânia Auxiliadora Pereira ◽  
Marcelo Brison de Mattos ◽  
Evaldo José Corat ◽  
Vladimir Jesus Trava-Airoldi
Keyword(s):  
Automotive Industry ◽  
High Hardness ◽  
Carbon Films ◽  
Low Friction ◽  
Tribological Test ◽  
Mechanical And Tribological Properties ◽  
Pulsed Dc ◽  
Deposition Parameters ◽  
Chemical Inertness ◽  
Silicon Interface

The martensitic stainless steel X45CrSi93 is widely used in the automotive industry. One way to improve its properties is the deposition of high adhesiveness DLC films, which are well known for their excellent properties such as high hardness, low friction coefficient, chemical inertness, biocompatibility and excellent wear resistance. In this work, the adhesion between substrate and film was studied, by growing silicon interfaces with different deposition parameters. The technique used for growing these films was PECVD pulsed-DC. In order to obtain information of the silicon interface formation, ionic sub-implantation simulations were performed, by the software SRIM/TRIM. Raman spectroscopy was used to verify the atomic structure of the films. Scratch tribological test was performed to study adhesion. It was observed that the mechanical and tribological properties were greatly improved with the deposition of DLC films on the silicon interface. A correlation between the residual stress and adhesion of DLC films was found.

Study on Technology Parameters for Coated Carbide Cutting Tools

2014 ◽  
Vol 556-562 ◽  
pp. 498-501
Author(s):  
Xiao Jing Li ◽  
Yan Hui Hu ◽  
Di Wang ◽  
Dong Man Yu
Keyword(s):  
Hard Alloy ◽  
Cutting Force ◽  
Metal Cutting ◽  
Cutting Tools ◽  
High Hardness ◽  
Machining Process ◽  
High Wear Resistance ◽  
Workpiece Material ◽  
Ticn Coating ◽  
Coated Carbide

Metal cutting processing is the most fundamental, most widely and the most important processing in industrial production. Because the development of mechanical manufacturing level plays a very important role in the coating technology material machining process. A coated carbide cutting tool with its high hardness and high wear resistance, good chemical stability and extensive compatibility characteristics, is widely applied in the metal cutting processing field. The author mainly studies the cutting force contrast between coated carbide cutting tools and not coated ones. Cutting tests have testified that if PVD technology applied on cutting, the cutting force of hard alloy cutter will alter with the change of feeds (f), depth of cutting (ap) and cutting velocity (v). The experiment suggests that the size of three-way cutting force of either the brand ZP25 hard alloy cutter or the carbide cutter by employing matrix ZP25 hard alloy cutter to respectively using PVD technology coat TiN or TiCN coating is successively FZP25>FTiCN>FTiN. The main reason for this is that the difference of frictional factor of the three kinds of cutter material and the workpiece material.

scholarly journals Improved Adhesion of the DLC Coating Using HiPIMS with Positive Pulses and Plasma Immersion Pretreatment

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1070
Author(s):  
Iñigo Gómez ◽  
Adrián Claver ◽  
José Antonio Santiago ◽  
Iván Fernandez ◽  
Jose Fernandez Palacio ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Physical Vapor Deposition ◽  
High Wear Resistance ◽  
Low Friction ◽  
New Techniques ◽  
Dlc Coatings ◽  
Dlc Coating ◽  
Chemical Inertness ◽  
Modification Technique ◽  
Tribomechanical Properties

Diamond-like carbon (DLC) coatings are used due to their extraordinary tribomechanical properties, great hardness, high elastic modulus, high wear resistance, low friction coefficient and chemical inertness, which provide them with biocompatibility. Compared to other physical vapor deposition (PVD) coatings of transition nitrides and carbonitrides, DLC has limited adhesion, so it is necessary to develop new techniques to overcome this limitation. This work reports the results of scratch testing for the measurement of adhesion and of tests for wear resistance and nanoindentation in AISI 316L stainless steel coated with a WC:C coating, produced using novel high-power impulse magnetron sputtering (HiPIMS) technology with positive pulses. In addition, the use of a preceding surface modification technique, specifically plasma immersion ion implantation (PIII), was studied with the aim of optimizing the adhesion of the coating. The results show how the coating improved the tribomechanical properties through the use of positive pulse HiPIMS compared to conventional HiPIMS, with an adhesion result that reached critical load values of 48.5 N and a wear coefficient of 3.96 × 10−7 mm3/nm.

Soft annealing technology applied to high chromium white cast iron

2021 ◽  
Vol 95 ◽  
pp. 18-23
Author(s):  
Minh Nguyen Ngoc ◽  
Keyword(s):  
Heat Treatment ◽  
Cast Iron ◽  
White Cast Iron ◽  
High Hardness ◽  
Optical Microscope ◽  
Machining Process ◽  
High Wear Resistance ◽  
Primary Carbide ◽  
Hardness Tester ◽  
Before And After

High Cr white cast iron is an alloy widely used in the field of manufacturing parts working in conditions of high wear resistance. However, the machining process for this alloy is often difficult due to its high hardness. Therefore, the objective of this study is to find out the appropriate parameters of heat treatment process to be able for softening of high Cr white cast iron with a lower hardness, ensuring the cutting process. In this study, the samples were austenitized partially and soft annealed in a resistance furnace. Optical microscope, X-ray diffractometer and field emission scanning electron microscope were used to observe and evaluate the microstructure of samples before and after heat treatment. The Rockwell hardness tester (RHT) is also used to evaluate hardness variation of samples. Research results have shown that the change of primary carbide grain size and formation of secondary carbides during heat treatment can reduce the hardness of white cast iron to the suitable range for machining.

Residual Stress Analysis of Polycrystalline Diamond after Electrical Discharge Machining

2013 ◽  
Vol 820 ◽  
pp. 106-109 ◽  
Author(s):  
M. Zulafif Rahim ◽  
Arash Pourmoslemi ◽  
Song Lin Ding ◽  
John Mo
Keyword(s):  
Residual Stress ◽  
Electrical Discharge ◽  
Cutting Tool ◽  
Electrical Discharge Machining ◽  
Polycrystalline Diamond ◽  
High Hardness ◽  
Machining Process ◽  
Hard Materials ◽  
Advanced Machining ◽  
Pcd Tools

The extreme hardness of Polycrystalline Diamond (PCD) makes it an ideal choice for the machining of hard materials as a cutting tool. Due to the high hardness, fabrication of PCD tools relies on conventional abrasive grinding which suffers from low machining efficiency. Electrical discharge machining (EDM) is an advanced machining process and can be utilised to fabricate complicated PCD tools. High temperature of sintering and EDM processes creates residual stress inside PCD and can result in unmatured failure of PCD tools. This paper analyses the distribution of residual stress in PCD after electrical discharge machining process.

Electrical Discharge Grinding (EDG) of Polycrystalline Diamond - Effect of Machining Polarity

2014 ◽  
Vol 1025-1026 ◽  
pp. 628-632 ◽  
Author(s):  
Mohammad Zulafif Rahim ◽  
Song Lin Ding ◽  
John Mo
Keyword(s):  
Electrical Discharge ◽  
Complex Geometry ◽  
Polycrystalline Diamond ◽  
Machining Process ◽  
Morphological Examination ◽  
Carbon Structure ◽  
Finishing Process ◽  
Advanced Machining ◽  
The Difference ◽  
Pcd Tools

Electrical discharge grinding (EDG) is an advanced machining process and can be utilised to fabricate complex geometry of PCD tools. However, the PCD removal mechanism in this process is complicated. This study was carried out to understand the difference in PCD surface structure with difference EDG polarities. The study revealed that the finishing process with negative polarity is the reason for the porous structure on the surface. Further analysis on the chemical element and carbon structure were implemented as the morphological examination of the surface.

Friction and Wear Properties of Magnetron Sputtered DLC/SiC Films on Magnesium Alloy

2009 ◽  
Vol 610-613 ◽  
pp. 853-858 ◽  
Author(s):  
Xiao Jing Xu ◽  
Deng Fu Xia
Keyword(s):  
Friction And Wear ◽  
High Hardness ◽  
High Wear Resistance ◽  
Modulus Ratio ◽  
Wear Properties ◽  
Silicon Carbon ◽  
Alloy Az91d ◽  
The Mean ◽  
Friction And Wear Properties ◽  
Sic Films

The nano-indentation response and the friction/wear properties of DLC/SiC (diamond-like carbon/silicon carbon) double layer thin films deposited on Mg alloy (AZ91D) substrate using magnetron sputtering technique at room temperature were investigated. The results show that the DLC films displayed low nano-hardness (3.05 GPa), low Young's modulus (24.67 GPa) but high hardness-to-modulus ratio (0.124). The films-substrate system exhibited a good friction and wear properties with the mean friction coefficient of about 0.175, the special wear rate in the magnitude order of 10−6 mm3 m−1 N−1 together with little film-cracking and interface-delaminating, when sliding against Si3N4 (silicon nitride) ball using ball-on-disc wear tester under dry frictional condition. The high wear-resistance is in accordance with high ductility of the films, good modulus match in the films-substrate system, and high hardness-to-modulus ratio of the films. The underlying factors are discussed and are believed to be due to the substrate is Mg, a metal with high activity.

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