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증착압력에 따른 Titanium 코팅 특성평가에 관한 연구
김도현(Do-Hyeon Kim),전중호(Joong-Ho Chun),양진호(Jin-Ho Yang),김현지(Hyun-Ji Kim),허선철(Sun-Chul Huh) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this study, titanium coating of aerospace AL7075-t7351 alloy using DC magnetron sputtering techniques was presented. The work press has been adjusted to improve surface modification to improve the hardness and adhesion strength of the aluminum thin film and titanium thin film. After titanium deposition, tests of friction coefficient, wear loss, hardness, and adhesion strength of the film were performed. As a result, the friction coefficient and abrasion loss adhesive strength characteristics were excellent under the deposition time of 90 minutes and 2Torr. Coating with titanium increased hardness compared to substrate materials and improved adhesion strength compared to base materials.
육상시추용 Mud treatment system의 유동특성 평가
김승찬 ( Seung-chan Kim ),전중호 ( Joong-ho Chun ) 한국산업융합학회 2021 한국산업융합학회 논문집 Vol.24 No.6
Drilling Mud Treatment Systems are widely used for Oil Gas drilling mud circulation, horizontal directional drilling mud recycling, geothermal drilling, mining, coal exploration drilling, water well drilling. Degasser is a device used in drilling to remove gasses from drilling fluid which could otherwise form bubbles. For small amounts of entrained gas in a drilling fluid, the degasser can play a major role of removing small bubbles that a liquid film has enveloped and entrapped. As with the desander, its purpose is to remove unwanted solids from the mud system. The smaller cones allow the desilter to efficiently remove smaller diameter drill solids. In this study, a simulation study is conducted on the degasser of the facility in the Mud Treatment System to conduct a performance review on the gas separation in the mud.
이왕도 ( Wang-do Lee ),한상목 ( Sang-mok Han ),전중호 ( Joong-ho Chun ) 한국산업융합학회 2021 한국산업융합학회 논문집 Vol.24 No.6
An investigation is conducted to study a solid-liquid mixture vertically upward hydraulic transport of solid particles by non-Newtonian fluids in the Mud system. Rheology of particulate suspensions in viscoelastic fluids is of importance in many applications such as particle removal from surfaces, transport of proppants in fractured reservoir and cleaning of drilling holes, etc. In this study a clear acrylic pipe was used in order to observe the movement of solid particles. Annular velocities varied from 0.4 m/s to 1.2 m/s. The mud systems which were utilized included aqueous solution of sodium carboxymethyl cellulose (CMC) solutions. Main parameters considered in the study were inner-pipe rotary speed, fluid flow regime and particle injection rate. Solid volumetric concentration and pressure drops were measured for the various parameters such as inclination angle, flow rate, and rotational speed of inner cylinder.