scholarly journals Ultrasonic Deposition of Carbon Nanotubes on Polycrystalline Cubic Boron Nitride Composites

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 516
Author(s):  
Manuela Pacella ◽  
Sina Saremi-Yarahmadi ◽  
Luciano Lamberti
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Boron Nitride ◽  
Ion Beam ◽  
Cubic Boron Nitride ◽  
Cutting Tools ◽  
Premature Failure ◽  
Abrasive Resistance ◽  
Polycrystalline Cubic Boron Nitride ◽  
Ultrasonic Bonding

Polycrystalline cubic boron nitride (PcBN) are super-hard materials with high hardness and excellent abrasive resistance, widely used in cutting tools for precision machining of automotive and aerospace parts; however, their brittle properties make them prone to premature failure. Coatings are often applied to PcBN to extend their range of applicability and durability. Conventional coating methods are limited to the thickness range of a few hundred nanometres, poor adhesion to the substrate, and limited stability under ambient conditions. To further the properties of PcBN composites, in this paper, we explore the use of ultrasonic bonding to apply thick coatings (30–80 μm) on PcBN cutting tools. For the first time, a multi-walled carbon nanotube (MWCNT) powder is preplaced on a PcBN substrate to allow an unconventional coating technique to take place. The effects of ultrasonic bonding parameters on the change of mechanical properties of the coated tools are investigated through scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), micro-hardness analyses, and white light interferometry. The structure of the carbon nanotubes is investigated through transmission electron microscopy (pre coating) and cross-section of the bonded MWCNTs is studied via focused ion beam milling and SEM to evaluate the bonding between the multi-walled nanotubes. Optimum processing windows (i.e., bonding speed, energy, and pressure) are discovered for coating MWCNTs on PcBN. Focus ion beam milling analyses revealed a relationship between consolidation parameters and porosity of MW(pCNT) bonds. The proposed method paves the way for the novel design of functional coatings with attunable properties (i.e., thickness and hardness) and therefore improved productivity in the machining of aerospace and automotive parts.

scholarly journals Technics Research on Polycrystalline Cubic Boron Nitride Cutting Tools Dry Turning Ti-6AL-4V Alloy Based on Orthogonal Experimental Design

2018 ◽  
Vol 142 ◽  
pp. 03002
Author(s):  
Yunhai Jia ◽  
Lixin Zhu
Keyword(s):  
Surface Roughness ◽  
Experimental Design ◽  
Boron Nitride ◽  
Feed Rate ◽  
Flank Wear ◽  
Cubic Boron Nitride ◽  
Cutting Tools ◽  
Cutting Speed ◽  
Orthogonal Experimental Design ◽  
Polycrystalline Cubic Boron Nitride

Ti-6Al-4V components are the most widely used titanium alloy products not only in the aerospace industry, but also for bio-medical applications. The machine-ability of titanium alloys is impaired by their high temperature chemical reactivity, low thermal conductivity and low modulus of elasticity. Polycrystalline cubic boron nitride represents a substitute tool material for turning titanium alloys due to its high hardness, wear resistance, thermal stability and hot red hardness. For determination of suitable cutting parameters in dry turning Ti-6AL-4V alloy by Polycrystalline cubic boron nitride cutting tools, the samples, 300mm in length and 100mm in diameter, were dry machined in a lathe. The turning suitable parameters, such as cutting speed, feed rate and cut depth were determined according to workpieces surface roughness and tools flank wear based on orthogonal experimental design. The experiment showed that the cutting speed in the range of 160~180 m/min, the feed rate is 0.15 mm/rev and the depth of cut is 0.20mm, ideal workpiece surface roughness and little cutting tools flank wear can be obtained.

Ion Beam Assisted Deposition of Cubic Boron Nitride Thin Films

1991 ◽  
Vol 235 ◽  
Author(s):  
Daniel J. Kester ◽  
Russell Messier
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Boron Nitride ◽  
Ion Beam ◽  
Cubic Boron Nitride ◽  
Secondary Phase ◽  
Ion Energy ◽  
Ion Beam Assisted Deposition ◽  
Transmission Electron ◽  
Argon Ions

ABSTRACTBoron nitride thin films were grown using ion beam assisted deposition. Boron metal was evaporated, and the depositing film was bombarded by nitrogen and argon ions. The films were characterized using Fourier transform infrared spectroscopy, electron diffraction, transmission electron microscopy, and Rutherford backscattering. The thin films were found to be cubic boron nitride, consisting of 100–200 Å crystallites with a small amount of an amorphous secondary phase. The best conditions for depositing cubic boron nitride were found to be a substrate temperature of 400°C, bombardment by a 50:50 mixture of argon and nitrogen with a bombarding ion energy of 500 eV and a ratio of bombarding ions to depositing boron atoms of from 1.0 to 1.5 ions per atom.

On the cutting force of micro-textured polycrystalline cubic boron nitride cutting tool for powder metallurgy materials

2020 ◽  
Vol 12 (7) ◽  
pp. 168781402093849
Author(s):  
Haidong Yang ◽  
Zhengguang Han ◽  
Xiquan Xia ◽  
Qidong Wang ◽  
Juchen Zhang ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Boron Nitride ◽  
Cutting Force ◽  
Cutting Forces ◽  
Cubic Boron Nitride ◽  
Cutting Tools ◽  
Cutting Performance ◽  
Polycrystalline Cubic Boron Nitride ◽  
Texture Parameters ◽  
Cutting Velocity

Micro-textured cutting tools were widely reported due to the improved cutting performance, for example, the reduction of cutting forces. However, the cutting performance is significantly dependent on the parameters of the micro-textures. In this work, some polycrystalline cubic boron nitride tools with designed circular micro-textures were designed and manufactured by laser processing technology, and used to machine powder metallurgy materials. The effect of micro-texture parameters (diameter, depth and density) on the cutting forces ( FX, FY, FZ and Fr) was studied by an orthogonal test, the effect of cutting velocity on the cutting force was also studied. The results have shown that the pit diameter and depth have more significant effect on the cutting forces than the cutting velocity and pit density. As compared with the non-textured tools, the textured tools can effectively reduce the cutting forces and the optimal cutting forces were achieved at parameters as 230 μm for diameter, 90 μm for depth, 20% for density and 110 m/min for cutting velocity. The present findings are of significance for the design of polycrystalline cubic boron nitride cutting tools and the processing of powder metallurgy materials.

Nanopatterning on Nano-Polycrystalline Diamond and Cubic Boron Nitride Using Focused Ion Beam and Heat Treatment to Fabricate Textured Cutting Tools

2016 ◽  
Vol 874 ◽  
pp. 543-548 ◽  
Author(s):  
Noritaka Kawasegi ◽  
Kazuma Ozaki ◽  
Noboru Morita ◽  
Kazuhito Nishimura ◽  
Makoto Yamaguchi ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Boron Nitride ◽  
Single Crystal ◽  
Focused Ion Beam ◽  
High Efficiency ◽  
Ion Beam ◽  
Cubic Boron Nitride ◽  
Cutting Tools ◽  
Polycrystalline Diamond ◽  
Single Crystal Diamond

Texturing on the surface of cutting tools is an effective method to improve the friction and resultant machining performances of the tool. In this study, to fabricate nanotextures on various tools used for precision cutting, a patterning method on nanopolycrystalline diamond and cubic boron nitride tools was investigated using focused ion beam (FIB) irradiation and heat treatment. Patterning was possible using this method, and the patterning characteristics were different from those of single-crystal diamond. This method was more suitable for cutting tools compared with direct FIB machining because of its high efficiency and significantly low affected layer.

scholarly journals The Geometric Surface Structure of EN X153CrMoV12 Tool Steel after Finish Turning Using PCBN Cutting Tools

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 428
Author(s):  
Michał Ociepa ◽  
Mariusz Jenek ◽  
Piotr Kuryło
Keyword(s):  
Boron Nitride ◽  
Cubic Boron Nitride ◽  
Cutting Tools ◽  
Material Surface ◽  
Roughness Parameters ◽  
Finish Turning ◽  
Polycrystalline Cubic Boron Nitride ◽  
Coated Tools ◽  
Flank Surface ◽  
Geometric Surface

The article presents the results of studying the effects of coated (TiN, TiAlN) and uncoated polycrystalline cubic boron nitride (PCBN) machining blades on the key geometric structure parameters of the surface of hardened and tempered EN X153CrMoV12 steel after finish turning. A comparative analysis of the use of coated and coated cutting tools in finish turning of hardened steels was made. Tool materials based on polycrystalline cubic boron nitride PCBN (High-CBN; Low-CBN) have been described and characterized. The advantages of using TiN and TiAlN-coated cutting tools compared to uncoated were demonstrated. The lowest influence of the feed on the values of all tested roughness parameters was noted for surfaces treated with TiN- and TiAlN-coated tools (both with 50 vol.% of CBN). For uncoated tools (60 vol.% of CBN) for feeds f = 0.2 and 0.3 mm/rev., the highest values of Ra and Rz roughness parameters were found. Moreover, the lack of protective coating contributed to the occurrence of intense adhesive wear on the flank surface, which was also in the range of the feed values f = 0.2 and 0.3 mm/rev. The analysis of material surface after treatment with the uncoated tools with the feed f = 0.2 mm/rev. showed the occurrence of the phenomenon of lateral material flow and numerous chip deflections.

The performance of polycrystalline cubic boron nitride tools in continuous, semi-interrupted, and interrupted hard machining

2009 ◽  
Vol 223 (8) ◽  
pp. 947-953 ◽  
Author(s):  
T Halpin ◽  
G Byrne ◽  
J Barry ◽  
E Ahearne
Keyword(s):  
Boron Nitride ◽  
Tool Wear ◽  
Large Scale ◽  
Cubic Boron Nitride ◽  
Cutting Tools ◽  
Wear Behaviour ◽  
Hard Machining ◽  
Polycrystalline Cubic Boron Nitride ◽  
And Performance ◽  
Hot Hardness

Polycrystalline cubic boron nitride (PCBN) cutting tools have enabled large-scale industrial hard machining owing to their high hot hardness and wear resistance. Experience clearly shows that tool requirements vary depending on the presence and severity of interrupts in the workpiece. The interrelationships between workpiece interruption parameters and tool wear and performance are assessed using a programme of continuous, semi-interrupted, and interrupted hard machining tests. A hypothesis for observed variations in wear behaviour between different PCBN grades and test conditions is developed on the basis of detailed tool wear scar analyses.

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