• Title/Summary/Keyword: 접착제 접합재

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A Study on the Bonding Materials used for the Great Jar of the Proto-Three Kingdoms Period from Daechuri Site, Pyeongtaek (평택 대추리 유적 출토 원삼국시대 대형옹(甕)에 사용된 접착재료 연구)

  • Cho, Nam-Chul;Kim, Soo-Chul;Kim, Woo-Hyun;Shin, Yeun-Sik
    • Journal of Conservation Science
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    • v.26 no.4
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    • pp.371-376
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    • 2010
  • The great jar estimated in Proto-Three Kingdoms period was found at the site from Pyeongtaek Daechuri and the bonding traces from pieces destroyed when they were excavated are observed. Therefore this study would figure out the components of bonding material used in great jars by optical microscope, FT-IR, py-GC/MS and the kind of textile attaching to great jar by transmitted light microscope. As a result of optical microscope for the cross-section, black material is uniformly applied between a piece of jar and the part of bonding and the textile line are observed. Black bonding material is resulted in korean rhus lacquer by FT-IR and py-GC/MS and the kind of textile is identified as hemp by transmitted light microscope. Materials for repairing archaeological objects are hardly known causing little information, but this study proves that the bonding material had used lacquer for great jars before Proto-Three Kingdoms period. Therefore if ancient bonding materials are systematically analysed in the further studies, it would be significant help for studying bonding and restoration materials of ancient objects.

On Plywood Manufacture from Tauns Grown in Papua New Guinea (파푸아뉴기니아산(産) 타운재(材)의 합판제조조건(合板製造條件))

  • Chang, Un-Yong
    • Journal of the Korean Wood Science and Technology
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    • v.8 no.2
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    • pp.9-16
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    • 1980
  • The problem of tauns having the characteristics of severe variations in quality and unequally distributed moisture content in veneer sheets after drying for plywood could be cured to a proper even moisture distribution by the peeling of veneers in a prolonged period. The poor gluability of tauns was improved by applicaton of increased resin content of glue in spreading. Combinations of tauns with lauan and kapur for plywood showed good shear strength.

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Evaluation of The Moment Resistance of Reinforced Wooden Gusset to Glulam Joint (보강목질적층판이 사용된 집성재 접합부의 모멘트 저항성능 평가)

  • Lee, In-Hwan;Song, Yo-Jin;Hong, Soon-Il
    • Journal of the Korean Wood Science and Technology
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    • v.45 no.1
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    • pp.53-61
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    • 2017
  • In this study, specimens were produced with a column member and a wooden gusset only by inserting an wooden gusset which is a substitute for steel plate into the center of a slit-processed column member. The moment resistance performance of the specimens was compared with that of control specimens that used a steel plate. The measured maximum moments of the specimens produced with GFRP-reinforced wooden laminated gussets and pins were lower by 24% on average compared to the steel plate-inserted specimens, but they showed good toughness. The fracture shape suggests that it was fractured along the annual rings between the pin and the end of the column member. The rigid specimen that integrated a laminated wood and a wooden laminated gusset with adhesive showed 2.8 times greater initial rigidity and 40% greater maximum moment on average compared to the control specimen. The rigid specimens mainly fractured on a glulam around glue line.

Analysis of adhesive material for joining pottery fragments excavated from Duurlig Nars, Mongolia (몽골 도르릭나르스 유적 토기의 접합에 사용한 물질 분석)

  • Yun, Eunyoung;Kang, Hyungtae
    • Journal of Conservation Science
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    • v.30 no.1
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    • pp.33-38
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    • 2014
  • The adhesive material was found for joining pottery fragments from Duurlig Nars, Mongolia estimated in AD 1C. In this study, analysis of natural substance for joining fragments of pottery was performed using gas chromatograph and mass spectrometer. As a result, it was identified triterpenoid substances, such as lupeol and betulin which were known to constituents of birch bark tar. It was suggested that Mongolian used adhesives made by birch bark tar for joining pottery fragments. Therefore if organic materials of ancient objects are systematically researched, it can provide significant evidence related to the way of life of ancient people.

Conservation and Restoration of Bronze Bowl with a Lid Excavated From Silver Bell Tomb in Gyeougju (경주 은령총 출토 청동제합의 보존)

  • Choi, Heeyoon;Huh, Ilkwon;Ahn, Juyoung;Park, Haksoo;Yu, Heisun
    • Conservation Science in Museum
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    • v.7
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    • pp.3-10
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    • 2006
  • The bronze bowl with lid excavated from Eunnyeongchong Tumulus in Gyeongju had been united in the past and then damaged. We removed deteriorated adhesive and other impurities from it and reunited it. Some fragments of the artifact has been lost; in particular, only half of the whole main body remains. Therefore, it needed restoration treatment for exhibition and conservation. The lid, relatively much part of which remains, was treated with the method that could easily detach the restored part; the main body with much restored part was united using epoxy resin so that the restored part could well bear the weight of the artifact.

A Study on the Joint Property by the Surface Treatment Method on the Jointing Method of PET Film using the High Hardness Liquid (고경질 도막을 이용한 PET 필름 접합공법의 필름 표면처리 방법에 따른 접합특성 연구)

  • Lee, Jong-Suk;Kim, Young-Sam;Shin, Hong-Chol;Kim, Young-Geun;Kang, Chung-Mo
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.18 no.3
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    • pp.153-159
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    • 2014
  • This research reviewed the joint and duration characteristics depending on the surface treatment condition and lap spliced length in the PET film jointing method using the high hardness liquid material. As a result, the corona discharge treatment was improved to the contact angle, joint tensile strength, and joint peel resistance compared to non-treatment. Particularly, a surface treatment E (Corona discharge + Primer + PU bond + Polyester fabric) turned out to the best, and especially when the lap spliced length is longer than 15mm, stable joint performance was secured under the long term deterioration treatment of 16 weeks. Thus, the joint is considered to be applicable as the water-proof material.

Mechanical evaluation of SiC-graphite interface of seed crystal module for growing SiC single crystals (탄화규소 단결정 성장을 위한 종자결정모듈의 탄화규소-흑연 간 접합계면의 기계적 특성 평가)

  • Kang, June-Hyuk;Kim, Yong-Hyeon;Shin, Yun-Ji;Bae, Si-Young;Jang, Yeon-Suk;Lee, Won-Jae;Jeong, Seong-Min
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.32 no.5
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    • pp.212-217
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    • 2022
  • Large thermal stress due to the difference between silicon carbide and graphite's coefficients of thermal expansion could be formed during crystal growing process of silicon carbide (SiC) at high temperature. The large thermal stress could separate the SiC seed crystals from graphite components, which bring about the drop of the seed crystal during crystal growth. However, the bonding properties of SiC seed crystal module has hardly reported so far. In this study, SiC and graphite were bonded using 3 types of bonding agents and a three-point bending tests using a mixed-mode flexure test were conducted for the bonded samples to evaluate the bonding characteristics between SiC and graphite. Raman spectroscopy, X-ray Photoelectron Spectroscopy, and X-ray Computed Tomography were used to analyze the bonding characteristics and the microstructures of the SiC-graphite interfaces bonded with the bonding agents. As results, an excellent bonding agent was chosen to fabricate SiC seed crystal module with 50 mm in diameter. An SiC single crystal with 50 mm in diameter was successfully grown without falling out during top seeded solution growth of SiC at high temperature.

A Parametric Study on the Strength of Single-Lap Bonded Joints of Carbon Composite and Aluminum (탄소 복합재-알루미늄 단일겹침 접착 체결부의 강도에 관한 인자연구)

  • Kim, Tae-Hwan;Seong, Myeong-Su;Choi, Jin-Ho;Kweon, Jin-Hwe
    • Composites Research
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    • v.20 no.5
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    • pp.34-42
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    • 2007
  • Strength and failure of adhesively bonded carbon composite-to-aluminum single-lap joints were studied by experiment. The main objective of this study is to investigate the effect of various parameters such as curing pressure for bonding, overlap lengths, and adherend thickness on the failure loads and modes of the bonded Joints with dissimilar materials. Experimental results show that the bonding pressure for composite-to-aluminum dissimilar materials should be 4 atm at the lowest. Failure load of the joints increases as the overlap length increases, but the strength (failure load divided by bonded area) decreases rapidly after the overlap width-to-length ratio is greater than 1. When the adherend thickness increase to double, bonding strength increase $12{\sim}55%$. Major failure mode of the joints is the delamination in the composite laminate and the location of delamination goes deeper into the laminates as the bonding pressure and overlap length increase.

Effect of Distance between Finger Tip and Root Width on Compressive Strength Performance of Finger-Jointed Timber (핑거공차가 핑거접합재의 압축강도 성능에 미치는 영향)

  • Ryu, Hyun-Soo;Ahn, Sang-Yeol;Park, Han-Min;Byeon, Hee-Seop;Kim, Jong-Man
    • Journal of the Korean Wood Science and Technology
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    • v.32 no.4
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    • pp.66-73
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    • 2004
  • Three species of Italian poplar (Populus euramericana), red pine (Pinus densiflora) and oriental oak (Quercus variabilis) were selected for this study. They were cut so that the distances between each of tips and roots for a pair of fingers were 0, 0.15, 0.30 and 0.45 mm. Poly vinyl acetate (PVAc) and resorcinol-phenol resin (RPR) were used for finger-jointing. Compressive test parallel to the grain was conducted for the finger-jointed specimens. The results were as follows: The efficiency of compressive Young's modulus of finger-jointed timber to solid wood indicated low values, whereas the efficiency of compressive strength indicated high values of more than 90% in all species, especially, it was found that those of red pine indicated markedly high values of more than 97%. The efficiency of compressive displacement of Italian poplar finger-jointed timber was 2 times higher than solid wood, and it was 1.2 and 1.3 times higher than solid woods in red pine and oriental oak, respectively. Also, it was found that 0, the distance between each tip and root for the fingers, indicated the highest efficiency of compressive strength performance in Italian poplar finger-jointed timber, and for red pine and oriental oak finger-jointed timbers, the distances of 0.15 and 0.30 were found to indicate the highest efficiency.

Effect of Adhesive Shear Strength of CFRP/Ni-Cr Alloy Under Severe Environmental Condition (가혹 환경이 복합재/Ni-Cr 합금 접착전단강도에 미치는 영향 연구)

  • Cho, Hyeon-Tae;Park, Seong-Min;Kim, Min-Jun;Hoang, Van-Tho;Kim, Hak-Inn;Son, Myung-Sook;Ahn, Jong-Kee;An, Ji-Min;Choi, Jin-Ho;Nam, Young-Woo;Kweon, Jin-Hwe
    • Composites Research
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    • v.33 no.5
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    • pp.275-281
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    • 2020
  • The mechanical property related to lap shear strength of the joint structure between carbon fiber reinforced polymer (CFRP) composite and metal (Ni-Cr Alloy) under varying environmental conditions (temperature and humidity) was studied in order to apply to the aircraft fan blade. Room temperature dry (RTD), elevated temperature wet (ETW), and cold temperature dry (CTD) environmental conditions were chosen for investigation based on the flight conditions of aircraft. Lap shear strength tests were conducted according to ASTM Standard D3528 to evaluate the shear strength. The microstructure characteristic of failure zone was analyzed by SEM images to check the adhesive shear strength with the three environmental conditions. In comparison with shear strength for the RTD condition, the shear strength in the ETW condition was reduced by 72.8% while those for the CTD condition increased by 56.5%. The moisture absorption and high temperature in ETW condition strongly had an affect on mechanical property of adhesive, while cold temperature could enhance the adhesive shear strength due to the higher brittleness.