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이택민(T.M.Lee),김동수(D.S.Kim),조정대(J.D.Jo),양정순(J.S.Yang),강태구(T.G.Kang),김광영(K.Y.Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
In this paper, we present a design, fabrication and performance test of the novel DoD metal-jet injector for application to the high-density and high-temperature-melting materials. We design the gap adjustable DoD injector for controlling the size, speed and direction of the ejected metal droplets. The effect of design parameters on droplet size was analyzed. Fabricated gap adjustable injector ejects the D.I. water microdroplets whose measured volume is 7.23nl with the 4.8m/sec velocity through the 50㎛-diameter nozzle. Also the injector print the metal microdots, whose diameter is about 600㎛, on the glass at the chamber temperature of 200℃. Consequently, present novel metal-jet injector has a potential to applications for the fabrication of the low-cost fabrication of the electronic devices.
김동수(D. Kim),김만(M. Kim),박상언(S. U. Park),남기석(K. S. Nam),장도연(D. Y. Chang),권식철(S. C. Kwon),신동수(D. S. Shin) 한국표면공학회 2001 한국표면공학회지 Vol.34 No.1
The addition of organic compound containing -COOH, -CONH₂, -CHO group such as formic acid, formamide, formaldehyde or diethyleneamine to a chromium electroplating bath results in a chromium deposit in which carbon is incorporated. Such deposits have fewer defects than chromium layers produced by a conventional method. It was found that the as-deposited layers were amorphous and auger electron spectroscopy (AES) showed that carbon is distributed uniformly in the deposit. During heat treatment, Cr-C deposits began to crystallize at 400℃, and at 800℃ they were crystallized into chromium carbides and oxides. The effects of current density, amount of additives, applied current waveform on Cr-C alloy electroplating were examined.