Micro Drilling of Single Crystal SiC Using Polycrystalline Diamond Tool

In this study, the tool performance of two types of binderless diamond tools – single-crystal diamond (SCD) and nano-polycrystalline diamond (NPD) – is investigated in the high-speed cutting of titanium alloy (Ti-6Al-4V) with a water-soluble coolant. The NPD tool allows for a larger cutting force than the SCD tool by dulling of the cutting edge, despite NPD being harder than SCD. This large cutting force and the very low thermal conductivity of NPD yield a high cutting temperature above 500°C, which promotes the adhesion of the workpiece to the tool face, thereby increasing tool wear. Based on the morphology of the tool edge without scratch marks and the elemental analysis by energy-dispersive X-ray spectroscopy (EDX) of both the flank face and the cutting chips, diffusion-dissolution wear is determined to be the dominant mechanism in the diamond tool. A thin TiC layer seems to be formed in the boundary between the diamond tool and the titanium alloy at high temperatures; this is removed by the cutting chips.

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Prediction of the surface roughness and material removal rate in chemical mechanical polishing of single-crystal SiC via a back-propagation neural network

Precision Engineering ◽

10.1016/j.precisioneng.2021.04.012 ◽

2021 ◽

Vol 72 ◽

pp. 102-110

Author(s):

Jiayun Deng ◽

Qixiang Zhang ◽

Jiabin Lu ◽

Qiusheng Yan ◽

Jisheng Pan ◽

...

Keyword(s):

Neural Network ◽

Surface Roughness ◽

Single Crystal ◽

Material Removal Rate ◽

Chemical Mechanical Polishing ◽

Material Removal ◽

Removal Rate ◽

Back Propagation ◽

Back Propagation Neural Network ◽

Single Crystal Sic

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Polycrystalline Diamond Films and Single Crystal Diamonds Grown by Combustion Synthesis

CIRP Annals ◽

10.1016/s0007-8506(07)61125-1 ◽

1990 ◽

Vol 39 (1) ◽

pp. 585-588 ◽

Cited By ~ 2

Author(s):

R. Komanduri ◽

L.L. Fehrenbacher ◽

L.M. Hanssen ◽

A. Morrish ◽

K.A. Snail ◽

...

Keyword(s):

Single Crystal ◽

Combustion Synthesis ◽

Diamond Films ◽

Polycrystalline Diamond

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Small Holes Fabrication on Soda Glass by Self-Elastic Polycrystalline Diamond Tool

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.516.516 ◽

2012 ◽

Vol 516 ◽

pp. 516-521

Author(s):

Chung Chieh Cheng ◽

Dong Yea Sheu

Keyword(s):

Surface Roughness ◽

Diamond Tool ◽

Polycrystalline Diamond ◽

The Self ◽

High Quality ◽

Drilling Tool ◽

Drilling Tools ◽

Absorbing Materials ◽

New Type ◽

Small Holes

This study describes a novel process to drill small holes in brittle materials such as glass, silicon and ceramic using a self-elastic polycrystalline diamond (PCD) drilling tool. In order to improve the surface roughness and reduce crack of the small holes, a new type of self-elastic PCD drilling tool equipped with vibration absorbing materials inside the housing was developed to fabricate small holes in glass in this study. The self-elastic PCD drilling tools could absorb the mechanical force by the vibration absorbing materials while the PCD tool penetrates into the small holes. Compared to conventional PCD drilling tools, the experimental results show that high-quality small holes drilled in glass can be achieved with cracking as small as 0.02mm on the outlet surface using the self-elastic PCD drilling tool.

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A Truing Technique of Flattening Diamond Grains for Fabricating Microstructures with Fine Surfaces

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.389-390.350 ◽

2008 ◽

Vol 389-390 ◽

pp. 350-355

Author(s):

Takeshi Harada ◽

Takuya Semba

Keyword(s):

Surface Roughness ◽

Electrical Discharge ◽

Diamond Tool ◽

Electrical Discharge Machining ◽

Polycrystalline Diamond ◽

Mesh Size ◽

Diamond Disk ◽

Working Surface ◽

Work Material ◽

Tool Profile

A truing technique that can be used to shape the tip of an electroformed diamond tool into a hemisphere and flatten diamond grains on the tool working surface at the same level as the bond face was developed. A polycrystalline diamond disk whose top surface roughened by electrical discharge machining was partially flattened by grinding was used as a truer. Diamond grains on the tool working surface were successfully flattened along the hemispherical tool profile when the grains mesh size of #1000 was employed. In addition, a grinding test using glasslike carbon as a work material revealed that a surface roughness of less than 50 nm Rz could be obtained in both cases when moving the tool on contour and scanning paths.

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