scholarly journals FORMATION OF THE STRUCTURE OF NITRIDE COATINGS INCREASING THE WEAR RESISTANCE OF CARBIDE INSERTS

2018 ◽  
pp. 97-100
Author(s):  
V. D. Parfenov ◽  
N. V. Zakirov
Keyword(s):  
Wear Resistance ◽  
Vacuum Plasma ◽  
Zirconium Nitrides ◽  
Nitride Coatings ◽  
Cutting Inserts ◽  
Contact Surfaces ◽  
Carbide Inserts

The article shows the raster electron microphotography of the microstructure of the surface of coatings made of titanium and zirconium nitrides on cutting inserts and the formation of their structure. The increase in wear resistance of carbide cutting inserts due to the application of vacuum plasma nitride coatings is explained by the change in a number of properties of the contact surfaces of the tool.

scholarly journals Hard machining of agricultural machines parts

2013 ◽  
Vol 59 (Special Issue) ◽  
pp. S42-S48
Author(s):  
R. Drlička ◽  
J. Žarnovský ◽  
R. Mikuš ◽  
I. Kováč ◽  
M. Korenko
Keyword(s):  
Boron Nitride ◽  
Cubic Boron Nitride ◽  
Machining Parameters ◽  
Surface Layers ◽  
Cutting Ceramics ◽  
Machining System ◽  
Cutting Inserts ◽  
Machine Elements ◽  
Hard Structures ◽  
Carbide Inserts

For the renovation and/or improvement of the surface properties of machine elements, hard facing is often used. Hard structures obtained in layers or by heat treatment achieve a hardness of up to 68 hardness (HRC) or even more. The grinding of these surfaces demands the use of processing fluids and causes sometimes changes in the surface layers structure. Hard turning can replace grinding when certain requirements are fulfilled, particularly tough machining system. Hard deposits of two weld-on materials on a sample of steel grade S235JRG1 have been turned using cemented carbide inserts with a TiAlN coating of PVD type. The surface roughness measurements along with the observation of insert wear have been conducted to find proper machining parameters and conditions for this application. Cutting inserts manufacturer guidelines for special application could be insufficient or even not provided. Besides that, it is necessary in the experiments to take into account and examine the cutting ceramics and cubic boron nitride (CBN)/polycrystalline cubic boron nitride (PCBN).

Cutting Properties of PVD and CVD Coated A2lO 3 + TiC Tool Ceramic

2007 ◽  
Vol 539-543 ◽  
pp. 1159-1164
Author(s):  
Mirko Sokovic ◽  
Leszek Adam Dobrzański ◽  
Janez Kopač ◽  
Ladislav Kosec
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
Micro Hardness ◽  
Wear Resistant Coatings ◽  
Hardness Tester ◽  
Hardness Tests ◽  
Cutting Inserts ◽  
Grey Cast ◽  
Tool Ceramics ◽  
Substrate Hardness

The paper presents investigation results of tribological and cutting properties of the coatings deposited with the PVD and CVD techniques on cutting inserts made from the Al2O3 + TiC tool ceramics. Tests were carried out on the inserts made from ceramics, uncoated and PVD or CVD-coated with gradient, mono-, multilayer and multicomponent hard wear resistant coatings composed of TiN, TiCN, TiAlN, TiAlSiN and Al2O3 layers. Substrate hardness tests and micro hardness tests of the deposited coatings were made on the ultra-micro-hardness tester. It was demonstrated, basing on the technological cutting tests of grey cast iron (260 HB), that putting down onto the tool ceramics the thin anti-wear PVD and CVD coatings increases their abrasion wear resistance, which has a direct effect on extending tool life of the cutting edge.

Wear resistance of arc ion-plated chromium nitride coatings

1993 ◽  
Vol 8 (5) ◽  
pp. 1109-1115 ◽  
Author(s):  
Yuji Chiba ◽  
Toshio Omura ◽  
Hiroshi Ichimura
Keyword(s):  
Phase Diagram ◽  
Wear Resistance ◽  
Surface Morphology ◽  
Bias Voltage ◽  
Gas Pressure ◽  
Chromium Nitride ◽  
Nitrogen Gas ◽  
High Toughness ◽  
Nitride Coatings ◽  
Two Parameters

Wear resistance of arc ion-plated chromium nitride films has been studied. It has been found that texture and phases composing the films depend much on bias voltage and nitrogen gas pressure at the deposition. A phase diagram was constructed as a function of these two parameters, which indicated that three categories exist: CrN single, CrN and Cr2N dual, and CrN and Cr dual phased regions, respectively. Results of Falex No. 2 test showed that the wear resistance of CrN single phased films is superior to others, especially when (220) preferred orientation is developed. Since hardness and surface morphology do not differ much between these films, a high toughness of CrN single phased film is considered to make a difference by suppressing abrasion wear.

Wear resistance performance of boron nitride coatings on end milling cutters

2017 ◽  
Vol 10 (3) ◽  
pp. 206
Author(s):  
Baris Çetin ◽  
Goksel Durkaya ◽  
Huseyin Kurtuldu ◽  
Tugce Hacaloglu ◽  
Merve Gurbuz ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Boron Nitride ◽  
End Milling ◽  
Nitride Coatings ◽  
Resistance Performance

Methods of Evaluating the Wear Resistance of the Contact Surfaces of Rolling Bearings

2021 ◽  
pp. 453-463
Author(s):  
Kostiantyn Svirzhevskyi ◽  
Oleg Zabolotnyi ◽  
Anatolii Tkachuk ◽  
Valentyn Zablotskyi ◽  
Dagmar Cagáňová
Keyword(s):  
Wear Resistance ◽  
Rolling Bearings ◽  
Contact Surfaces

Wear of Electric Contact Surfaces

2007 ◽  
Author(s):  
J. Song
Keyword(s):  
Wear Resistance ◽  
Precious Metals ◽  
Electrical Contacts ◽  
Fretting Corrosion ◽  
Coating Materials ◽  
Long Term Stability ◽  
Electric Contacts ◽  
Contact Surfaces ◽  
Contact Shape

Fretting corrosion is one of the important factors which limits the lifetime of electric contacts. In order to avoid fretting corrosion coatings of different precious metals are used. The wear resistance of the coating determines the lifetime of electrical contacts. The long term characteristics of gold coated electrical contacts with different additives and contact shapes are investigated and the results are analyzed. It is found out that the wear resistance of contact coating can be largely influenced by the amount of the additive in gold and by the design of the contact shape. Only the combination of an optimized contact shape with suitable coating materials leads to a long term stability of electric contacts.

Effects of TiN Single Layer Coating on the Wear of ZTA Cutting Inserts and Surface Roughness of Workpiece

2017 ◽  
Vol 888 ◽  
pp. 52-56
Author(s):  
Ahmad Zahirani Ahmad Azhar ◽  
Mokhzani Mokhtar ◽  
Mani Maran Ratnam ◽  
Zainal Arifin Ahmad
Keyword(s):  
Wear Resistance ◽  
Single Layer ◽  
Wear Area ◽  
Wear Performance ◽  
Cutting Insert ◽  
Cutting Inserts ◽  
Yttria Partially Stabilized Zirconia ◽  
Performance Results ◽  
Stainless Steel 316 ◽  
Quality Surface

Single layer TiN coated and uncoated zirconia toughened alumina (ZTA) cutting inserts were fabricated and used to machine stainless steel 316 in a turning process. The powders of alumina, yttria partially stabilized zirconia and magnesia were mixed and uniaxially pressed into rhombic cutting tool inserts and subsequently sintered at 1600°C for four hours in air. The inserts were coated with TiN layer using the PVD process. Results of wear area illustrate that the coated ZTA inserts show 66.7% increase in wear resistance compared to uncoated ZTA inserts. Commercially available Si3N4 inserts were used to compare the wear performance. Results of Si3N4 flank wear show a 64% more wear resistance compared to coated ZTA inserts. This may be attributed to the lower strength of coated ZTA cutting insert flank. Therefore, it is shown that single coating of TiN provides a significant advantage in the ZTA cutting performance and better quality surface finish.

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