Improvement of adhesion properties of glass prepared using SiC-deposited graphite mold via low-temperature chemical vapor deposition

Kim, Kyoung‐Ho; Hwang, Kuk‐Jin; Lee, Heesoo; Jeong, Seong‐Min; Lee, Myung‐Hyun; Bae, Si‐Young

doi:10.1007/s43207-019-00010-2

Cited by 10 publications

(3 citation statements)

References 19 publications

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“…A solid material with a two-dimensional structure has been identified as a typical solid lubricant; e.g., MoS 2 particles and coatings [19] and graphite [20] are frequently employed in industries to reduce the friction and galling in hot forming. In particular, a graphite mold provides a solution for the mold stamping of oxide glasses to optical lenses [21]; the lens surfaces are often contaminated by the dust of graphite. By contrast, DLC-coated dies often suffer from the adhesion of those glasses as well as metallic titanium, as reported in [22].…”

Section: Discussionmentioning

confidence: 99%

Anti-Galling Cold, Dry Forging of Pure Titanium by Plasma-Carburized AISI420J2 Dies

et al. 2021

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A bare AISI420J2 punch often suffers from severe adhesion of metallic titanium as well as titanium oxide debris particles in dry, cold forging of biomedical titanium alloys. This punch was plasma-carburized at 673 K for 14.4 ks to harden it up to 1200 HV on average and to achieve carbon supersaturation in the carburized layer. This plasma-carburized punch was employed in the cold, dry forging of a pure titanium wire into a flat plate while reducing the thickness by 70%. The contact interface width approached the forged workpiece width with increasing the reduction ratio. This smaller bulging deformation reveals that the workpiece is upset by homogeneous plastic flow with a lower friction coefficient. This low-friction and anti-galling forging process was sustained by an in situ solid lubrication mechanism. Unbound free carbon was isolated from the carbon-supersaturated AISI420J2 matrix and deposited as a thin tribofilm to protect the contact interface from mass transfer of metallic titanium.

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Section: Discussionmentioning

confidence: 99%

Anti-Galling Cold, Dry Forging of Pure Titanium by Plasma-Carburized AISI420J2 Dies

et al. 2021

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“…A solid lubricant such as MoS 2 and graphitic carbon has been widely utilized in the cold and hot forming of metals and metallic alloys in industries [ 22 , 23 ]. Since these solid-lubricating materials have a low dimensional crystalline structure, low friction and wearing conditions are maintained by their self-shearing process, especially in hot conditions.…”

Section: Discussionmentioning

confidence: 99%

Free-Forging of Pure Titanium with High Reduction of Thickness by Plasma-Carburized SKD11 Dies

et al. 2021

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A tool steel type SKD11 punch was plasma carburized at 673 K for 14.4 ks at 70 Pa to make carbon supersaturation. This carburized SKD11 punch was employed for upsetting the pure titanium wire with the diameter of 1.00 mm up to the reduction of thickness by 70% in a single shot. Its contact interface to titanium work was analyzed to describe the anti-galling behavior in this forging. Little trace of titanium proved that the galling process was suppressed by the in situ solid lubrication. The isolated free carbon agglomerates are wrought as a solid lubricant to sustain the galling-free forging process. This anti-galling upsetting reduced the residual strains in the forged wires. A long titanium wire with a length of 45 mm was incrementally upset to yield the titanium ribbon with a thickness of 0.3 mm, the width of 2.3 mm, and the length of 50 mm. The grain size of original pure titanium was much reduced to 2 μm on average. A micro-pillared microtexture was imprinted onto this forged titanium ribbon.

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“…4(a). These peaks are deconvoluted to peaks representing C sp 2 (284.5 eV), C sp 3 (285.0 eV), and C-Cl (285.9 eV), and π-π satellite peaks (291.0 eV), with an sp 2 /sp 3 ratio of 3.5 according to Gaussian fitting, 30,41,42 and the atomic compositions are C (89.2%), O (0.5%), and Cl (10.3%), as shown in Table S2. † When this film is pyrolyzed at 900 °C under N 2 gas, the two apparent peaks at 285 and 291 eV are no longer clearly separated, as shown in Fig.…”

Section: Characterization Of Carbon Film From Pyrolyzed Parylene-cmentioning

confidence: 99%

Carbon electrode obtained via pyrolysis of plasma-deposited parylene-C for electrochemical immunoassays

Song

Park

Kim

et al. 2022

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Improvement of adhesion properties of glass prepared using SiC-deposited graphite mold via low-temperature chemical vapor deposition

Cited by 10 publications

References 19 publications

Anti-Galling Cold, Dry Forging of Pure Titanium by Plasma-Carburized AISI420J2 Dies

Anti-Galling Cold, Dry Forging of Pure Titanium by Plasma-Carburized AISI420J2 Dies

Free-Forging of Pure Titanium with High Reduction of Thickness by Plasma-Carburized SKD11 Dies

Carbon electrode obtained via pyrolysis of plasma-deposited parylene-C for electrochemical immunoassays

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