• Title, Summary, Keyword: 알루미늄합금

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Burst Test of Cast Al-Alloy Casing for Liquid Rocket Engine Turbopump (액체로켓엔진 터보펌프 알루미늄합금 주조케이싱 파열시험)

  • Yoon, Suk-Hwan;Jeon, Seong-Min;Kim, Jin-Han
    • Journal of the Korean Society of Propulsion Engineers
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    • v.16 no.5
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    • pp.81-88
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    • 2012
  • Turbopump is a key component in liquid rocket engines, and reducing weight while maintaining structural safety is one of the major concerns of turbopump designers. To reduce the weight aluminium alloy castings instead of steel casings are introduced. The casting process is especially useful for enhancement of productivity and for reduction of product costs. But, since castings are used in space vehicle engines, reliability cannot be compromised. Therefore, proper design, production process and thorough investigation should be performed to ensure structural integrity. In this study inlet casings for a fuel pump were casted with A356.0-T6 alloy and using one of them a burst test was conducted to ensure structural integrity. Structural analysis is performed for simulation, and with multiple strain gages strains are measured and compared with predictions.

Research about Size Effect of Solid Particles on Erosion Resistance of Aluminum Alloy and Infrared Windows (충돌 입자의 크기에 따른 알루미늄 합금과 적외선창의 입자침식 저항성 연구)

  • Hong, Yun Ky;Moon, Kwan Ho
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.44 no.12
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    • pp.1027-1034
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    • 2016
  • In this research, experimental study about size effect of solid particles on erosion resistance is presented. A high-density polyethylene particle with a mm-sized diameter is accelerated using a two-stage light gas gun up to Mach number of approximately 3.0. An accelerated particle impacts aluminum alloy such as Al1050 and Al6061 T6, and infrared windows such as ZnS and sapphire specimens. For the aluminum alloy, craters that form on the surface of the specimens are measured to characterize the erosion resistance of the material. For the infrared windows, repetitive tests are conducted until a linear or circumferential crack is found to create damage threshold curves that define a material's erosive resistance. From the comparison of test data for various sizes of high-density polyethylene particles, it is found that erosion resistance of material is linearly dependent on the size of particles.

A Study on the Effect of Metal Plate Position Design on Mechanical Strength during Lap Joint Dissimilar Friction Stir Welding Process of Aluminum Alloys (알루미늄 합금의 이종겹치기 마찰교반용접시 판재의 위치설계가 기계적 강도에 미치는 영향에 관한 연구)

  • Park, Hee-Sang;Ko, Jun-Bin;Choi, Won-Doo;Choi, Man-Young
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.3
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    • pp.66-72
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    • 2010
  • Recently, the use of means of transportation of the lightweight aluminum to temper the trend is increasing. More efficient use of lightweight aluminum material to Friction stir welding has been widely attempted. Types of welding tools at the right screw to rotate anti-clockwise direction, when the tensile stress exerted on the location of the top plate to the left in the direction of the welding process to the installation was able to obtain high tensile strength. A5052 to the top of the left in the direction of the welding process to install and, when you installed the right under the A6061 was not easily come up to the top of the A5052. Conversely, at the bottom left to install on top of the A6061 and A5052 have been installed at the bottom of the upper area of the A6061 and A5052 intrude easily form the shape of the hill you can see that it was formed.

Effect of Al Addition on the Microstructures of Rapidly Solidified Mg-Zn Alloy (급냉응고된 Mg-Zn합금의 응고조직에 미치는 Al첨가의 영향)

  • Kim, Yeon-Uk;Heo, Bo-Yeong
    • Korean Journal of Materials Research
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    • v.7 no.6
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    • pp.464-471
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    • 1997
  • Melt-overflow 급냉응고장치를 이용하여 두께 약 300$\mu\textrm{m}$, 폭 10mm의 Mg-Zn합급 스트립을 연속적으로 제조하였다. 또한 알루미늄을 첨가하여, 첨가원소에 따른 결정립미세화와 기계적강도에 미치는 영향을 조사하였다. 스트립의 미세응고조직은 전자현미경(TEM, SEM)과 image analyzer를 이용하여 분석하였으며, 경도시험으로 기계적특성을 평가하였다. Mg-5wt%Zn합금 스트립의 경도는 결정립크기의 제곱근에 반비례하여 급냉응고에 의한 결정립미세화 효과로 같은 조성의 일반주조 합금보다 2배 이상의 높은 경도값을 가지며, 알루미늄을 첨가함으로서 2배 정도의 결정립미세화 효과를 얻어 경도가 더욱 증가하였다. 결정입계를 따라 생성된 금속간화합물은 마그네슘화합금의 입계부식을 방지하여 우수한 내식성을 갖는다. 따라서 적절한 합금설계와 급냉응고법을 적용시키면 마그네슘합금의 취약성을 보완하며 경량성의 장점을 최대한 활용할 수 있다.

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기체방출 저감 연구와 초고진공 펌프의 응용

  • Park, Jong-Do
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.81-81
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    • 2016
  • 극고진공 장치와 대형 초진공 시스템에서 원하는 진공도를 합리적으로 얻기 위해서는 진공 재료의 기체방출률을 줄이는 것이 가장 효과적이다. 이 때문에 기능성 피막 처리, 고온 탈기체 처리와 같은 방법이 적용되고 있다. 스테인리스강은 표면에 치밀한 크롬 산화막을 만들거나 재료의 기체 함유량을 줄이는 방법을 사용한다. 알루미늄합금 강은 특수처리로 표면에 알루미늄 산화막을 형성함으로써 기체방출률을 낮추고 있다. 이 발표에서는 스테인리스강을 비교적 낮은 온도에서 처리하여 매우 낮은 기체방출률을 얻는 노력에 대하여 보고한다. 알루미늄합금에 대해서는 특수압출과 내 표면 거울처리 하는 방법에 대하여 설명한다. 또한, 연강과 같은 금속재료의 기체방출률 측정 결과를 제작 공정으로 설명한다. 한편, 지정한 시간 내에 목표 진공도를 얻는 것과 최소 배기속도를 선택하고 적절히 배분하는 것도 매우 중요하다. 작고 가벼운 게터 펌프와 이온펌프의 조합으로 이를 해결하는 노력, 이온펌프의 최적화 연구에 대하여 보고하고자 한다.

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Effect of Flux on Recovery of Aluminum During Molten Metal Treatment of Aluminum Can Scrap (알루미늄 캔 스크랩의 용탕처리 시 알루미늄 합금 회수에 미치는 플럭스의 영향)

  • Han, Chulwoong;Ahn, Byung-Doo;Kim, Dae-Guen;Lee, Man Seung;Kim, Yong Hwan
    • Journal of the Korean Institute of Resources Recycling
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    • v.29 no.1
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    • pp.70-80
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    • 2020
  • This study investigates the effect of flux type and mixing ratio on efficiency in aluminum can scrap recycling using induction furnace. The removal of surface coating layer of aluminum can scrap was possible through heat treatment at about 500 ℃ for about 30 min. The temperature for the melting process was set to be slightly above the melting temperature of the aluminium can scrap. The molten metal treatment was performed with different types of flux and mixing ratio. As a result, The optimum efficiency of Al recovery ratio was revealed when the process was performed with at least 3 wt.% of the flux (Salt and MgCl2 mixture of ratio 70:30) at 750 ℃. The mechanical property of the recovered Al alloy showed that the tensile strength is about 249 MPa and elongation is about 14 %. This result was found to be similar to the mechanical property of the virgin Al 5083 alloy.