• Title/Summary/Keyword: 티타늄합금

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Surface roughness changes caused by the galvanic corrosion between a titanium abutment and base metal alloy (티타늄 지대주와 비귀금속 합금사이의 갈바닉 부식에 의한 표면 거칠기 변화 평가)

  • Lee, Jung-Jin;Song, Kwang-Yeob;Ahn, Seung-Keun;Park, Ju-Mi
    • The Journal of Korean Academy of Prosthodontics
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    • v.49 no.1
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    • pp.65-72
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    • 2011
  • Purpose: The purpose of this study was to evaluate the level of electro-chemical corrosion and surface roughness change for the cases of Ti abutment connected to restoration made of base metal alloys. Materials and methods: It was hypothesized that Ni-Cr alloys in different compositions possess different corrosion resistances, and thus the specimens ($13{\times}13{\times}1.5\;mm$) in this study were fabricated with 3 different types of metal alloys, commonly used for metal ceramic restorations. The electrochemical characteristics were evaluated with potentiostat (Parstat 2273A) and the level of surface roughness change was observed with surface roughness tester. Paired t-test was used to compare mean average surface roughness (Ra) changes of each specimen group. Results: All specimens made of nickel-chromium based alloys, average surface roughness was increased significantly (P < .05). Among them, the Ni-Cr-Be alloy ($0.016{\pm}.007\;{\mu}m$) had the largest change of roughness followed by Ni-Cr ($0.012{\pm}.003\;{\mu}m$) and Ni-Cr-Ti ($0.012{\pm}.002\;{\mu}m$) alloy. There was no significant changes in surface roughness between each metal alloys after corrosion. Conclusion: In the case of galvanic couples of Ti in contact with all specimens made of nickel-chromium based alloys, average surface roughness was increased.

Tool wear monitoring of end mill in slot machining of titanium alloy (티타늄 합금의 슬롯가공에서 엔드밀 공구마멸 감시)

  • 하건호;구세진;김정석;양순철
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.101-104
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    • 1995
  • A acoustic emission (AE) sensor has been used to monitor tool were during milling process. The relation between tool wear and AE RMS (Root mean Square) signal was investigated experimentally. A avaliable monitoring index for monitoring toolwear was newly extracted form AE RMS. And on-line monitoring program was developed. The proposed monitoring system has verified experimentally by roughing end milling titanium alloy with TIN coated HSS tool.

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Process Design of Titanium Alloy Backward Extrusion (티타늄 합금의 후방압출 공정 설계)

  • 홍성석;김진영;김홍규;박태원;백두현;심인옥;김성식
    • Journal of the Korea Institute of Military Science and Technology
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    • v.6 no.1
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    • pp.68-80
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    • 2003
  • The backward extrusion process of titanium alloy with large length to diameter ratio was simulated for different punch and die shape. The process variables such as initial billet shape, interface friction, contacting time and punch velocity were investigated and compared with experimental results. To make more effectively titanium alloy cup shape forging products with vertical wall, a modified die design which can reduce forging load, prevent sticking with punch and minimize material loss was suggested.

Research of Titanium Weld Monitoring Systems (티타늄 용접 모니터링 시스템 연구)

  • Ryu, Jin-Bo;Kim, Gwan-Hyung
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2016.10a
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    • pp.674-675
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    • 2016
  • 원자번호 22번에 해당하는 티타늄(titanium)은 매우 단단하며 가볍고, 부식에도 강한 금속이다. 티타늄은 비슷한 강도의 강철에 비해서 가볍고 알루미늄 합금에 비해 2배나 강력하다. 뿐만 아니라 티타늄은 바닷물에도 부식되지 않아 선박이다 해양플랜트 산업에서 많이 쓰이는 금속이기도 하다. 본 연구는 해양플랜트 건설 사업에 쓰이는 티타늄 용접에 대한 모니터링 시스템을 연구하는데 있다. 티타늄 용접공정에 사용되는 용접 파라메타는 용접 전압, 전류, 용접 토치의 위빙속도 및 와이어 공급 속도로 선정하였으며, 이러한 용접 파라메타를 계측할 수 있는 MCU 기반의 계측 보드를 설계하여 TCP/IP 통신을 기반으로 원격지로 용접 데이터를 전송하도록 하였으며, 이러한 데이터를 실시간으로 데이터를 그래프로 표현하도록 개발하였다. 이러한 용접 데이터에 대한 모니터링을 통하여 용접 시 발생하는 다양한 현상을 파악할 수 있도록 하였다. 본 연구를 통해서 티타늄 용접 시 발생하는 각종 데이터를 실시간으로 모니터링 할 수 있도록 개발하였으며, 데이터베이스에 저장된 기록을 통해서 용접 시 발생한 전체적인 용접 과정을 날짜와 시간별로 저장하여 용접과정에서 발생하는 전 과정을 관리할 수 있도록 하여 어떤 부분에서 잘못된 용접이 발생했는지 파악할 수 있음을 확인하였다.

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Corrosion Characteristics of Ti alloy for Removable Partial Denture (국소의치용 티타늄 합금의 부식 특성)

  • Kim, Jeong-Jae;Kim, Won-Gi
    • The Journal of the Korea Contents Association
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    • v.14 no.4
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    • pp.237-242
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    • 2014
  • In this study, surface characteristics and corrosion behaviors have been investigated in addition to Zr elements on the low elastic modulus Ti-30Ta alloy. Low elastic modulus Ti-30Ta-xZr(x : 3, 7 and 15 wt %) alloys were prepared by arc melting and then heat treated at $1000^{\circ}C$ for 24 hrs in an argon atmosphere. Microstructures of the alloys were examined by field emission scanning electron microscope(FE-SEM) and X-ray diffractometer(XRD). Electrochemical experiments were performed using a conventional three-electrode configuration with a sample working electrode, a high density carbon counter electrode and a saturated calomel reference electrode. According to the result of polarization behavior in the Ti-30Ta-xZr alloys, the current density of homogenized Ti-30Ta-15Zr in the passive region was lower than the other alloys.

Mechanical Characteristics when Wire Electrical Discharge Machining and Surface Grinding for Titanium Alloy (티타늄합금의 와이어 방전가공과 연삭가공시 기계적 특성)

  • 김종업;왕덕현;김원일;이윤경
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2001.10a
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    • pp.172-178
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    • 2001
  • Titanium alloys have lightness, high strength and good corrosion resistant characteristics, and broadly used in manufacturing parts for military and aerospace industries. And these alloys also are recognized for organism materials comparatively and used as fixing ones in the human body. Nevertheless thess alloys have excellent properties such as corrosion resistance, heat resistance, and good tensile strength, it is difficult to machine by traditional methods because of high hardness and chemically activated property. So higher tool wear is expected when cutting by tools. Therefore, it is required nontraditional machining process. And the mechanical characteristics such as surface structure and shape, hardness and bending strength are studied for wire electrical discharge machined and surface ground titanium alloys for various heat-treated conditions.

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A Study on Characteristics of Cutting Tool Wear by Cooling Method in Rough Machining of Titanium Alloy (티타늄합금 황삭가공에서 냉각방법에 따른 절삭공구 마모특성에 관한 연구)

  • Kim, Gee-Hah
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.12 no.5
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    • pp.129-134
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    • 2013
  • Titanium used in industry has been widely applied for aerospace important parts and automobile important parts, etc. because the titanium is higher in strength compared to the steel and light in weight compared to the steel. This study is to investigate the effect of cutting tool cooling method and cutting time on the spindle speed and feed rate of vertical machining center as a parameter to find the rough cutting time in the medium speed cutting machining of the titanium alloy. It is found that the cutting machining heat are increased as the feed rate, cutting time and spindle speed are raised.

Effect of EDM Conditions when wire-EDM for Titanium Alloy (티타늄합금의 와이어 방전가공시 방전가공 조건의 영향)

  • 김종업;왕덕현;이윤경;김원일
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2001.04a
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    • pp.281-286
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    • 2001
  • Titanium alloy conducted in this experimental study has superior corrosive resistant and is mainly used in aerospace, automotive and petro-chemical industries. It is also treated with important materials of domestic goods due to improvement of the standard of living. In this study specimens were processed in the wire EDM after annealing, solution treatment and aging. Results were obtained through repeated experments of main rough process and finish process with the change of process parameters. Processing characteristics such as surface hardness, surfaces roughness, shape of processed surface and components were measured. The results confirmed that the above mentioned elements were improved in accordance with the number of process. Therefore, the optimal wire EDM condition in accord with processing characteristics is proposed in this experiment.

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A Study on the Grinding Characteristics of Titanium Alloy (티타늄합금의 연삭특성에 관한 연구)

  • Kim, Sung Hun;Choi, Hwan;Lee, Jong Chan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.1 no.1
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    • pp.55-62
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    • 2002
  • This investigation reports the grinding characteristics of titanium alloy(Ti-6AI-4V). Grinding experiments were performed at various grinding conditions. The grinding forces were measured to investigate the grindability of titanium alloy with the five different wheels including Green carbide, Alumina, Resin Diamond, Resin CBN and Vitrified CBN. To investigate the grinding characteristics of titanium alloy grinding force, force ratio, specific grinding energy and grinding-ratio were measured. Surface roughness was also measured with tracer and the ground surfaces were observed with SEM Residual stress measurement was conducted on the X-Ray Diffractometer. Force ratio of grinding of titanium alloy was very lower than that of grinding of SKD-11 Surface roughness with Resin Diamond wheel was a little larger and rougher surface than that with other wheels Grinding ratio of titanium alloy was a little lower than that of other materials. Grinding ratio of titanium alloy with Diamond wheel was almost six times larger than that With CBN wheel. As a result of five different wheels, the most excellent wheel in grinding of Titanium alloy was Resin Diamond wheel.

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