Ni-25at.%Al 금속간화합물의 연소합성반응에 미치는 사전 Annealing 처리의 영향
Effects of Pre-Annealing Treatment on the Combustion Synthesis of Ni3Al Intermetallics Coating
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The problem with intermetallics coating using the heat of molten casting is that the heat generated�ﾠ�ﾠ during combustion synthesis dissolvs the coating and the substrate metal. This study investigates whether pre-annealing before synthesis can control the reaction heat, with the aim of Ni3Al coating on the casting surface. Therefore, the effects of the annealing temperature and time on the combustion synthesis behavior of the powder compact of Ni-25at%Al after annealing were investigated. As results, the reaction heat when synthesized decreased as the annealing temperature was high and the annealing time was longer. This was attributed to the fact that Al was diffused to Ni particles during low temperature annealing and intermediate Ni-Al compounds were formed during high temperature annealing. After combustion synthesis, however, it was found that their microstructures were almost identical except for the amount of intermediate intermetallics. Furthermore, an annealing temperature above 450?, at which intermediate compounds begin to form, is needed to prevent the dissolving problem during synthesizing. The intermetallics synthesized after annealing at higher temperature and prolonger annealing time showed a good wear resistance. This might be because much intermediate intermetallics of high hardness were remained in the microstructure
Abstract
The problem with intermetallics coating using the heat of molten casting is that the heat generated�ﾠ�ﾠ during combustion synthesis dissolvs the coating and the substrate metal. This study investigates whether pre-annealing before synthesis can control the reaction heat, with the aim of Ni3Al coating on the casting surface. Therefore, the effects of the annealing temperature and time on the combustion synthesis behavior of the powder compact of Ni-25at%Al after annealing were investigated. As results, the reaction heat when synthesized decreased as the annealing temperature was high and the annealing time was longer. This was attributed to the fact that Al was diffused to Ni particles during low temperature annealing and intermediate Ni-Al compounds were formed during high temperature annealing. After combustion synthesis, however, it was found that their microstructures were almost identical except for the amount of intermediate intermetallics. Furthermore, an annealing temperature above 450?, at which intermediate compounds begin to form, is needed to prevent the dissolving problem during synthesizing. The intermetallics synthesized after annealing at higher temperature and prolonger annealing time showed a good wear resistance. This might be because much intermediate intermetallics of high hardness were remained in the microstructure
참고문헌 (14)
- Materials Sci. Soc. of JPN, "Intermetallic Compounds for Materials", pp.88~ (1995), Shokabo
- Morsi, K., "Reaction Synthesis Processing of Ni-Al Intermetallic Materials", Mater. Sci. Eng, 1(A299), pp.1~15 (2001)
- 이한영, "알루미늄 기판 위 반응합성 Coating 된 Ni-Al계금속간화합물의 미끄럼마모 특성 해석", 한국트라이볼로지학회지, 34(2), pp.67~73 (2018), 한국트라이볼로지학회[DOI]
- Lee, H. Y., "Sliding Wear Properties for Ni-Al based Intermetallic Compound Layer coated on Ductile Cast Iron by Combustion Synthesis", Wear, 260, pp.83~89 (2006)
- 이한영, "Nickel Aluminides Coating on Aluminum Substrate Using a Reaction Synthesis Process", Metals and Materials International, 21(1), pp.147~152 (2015), 대한금속·재료학회[DOI]
- 이한영, "Application of Ball-Milled Powder Mixture to Intermetallics Coating Through Reaction Synthesis", Metals and Materials International, 19(6), pp.1289~1293 (2013), 대한금속·재료학회[DOI]
- 이한영, "Ni-Al계 금속간화합물의 고주파 연소합성코팅에 미치는볼 밀링의 영향", 한국트라이볼로지학회지, 33(6), pp.296~302 (2017), 한국트라이볼로지학회[DOI]
- 이한영, "고주파 연소합성 코팅된 Ni-Al계 금속간화합물의 미끄럼마모 특성에 미치는 볼 밀링의 영향", 한국트라이볼로지학회지, 34(6), pp.284~291 (2018), 한국트라이볼로지학회[DOI]
- 이한영, "주철의 용탕열을 이용한 Ni-Al계 금속간화합물의 연소합성 코팅에 미치는 Ball Milling의 영향", 대한금속·재료학회지, 50(1), pp.28~33 (2012), 대한금속·재료학회
- 이한영, "알루미늄 주물 위 용탕열을 이용한 Ni-Al계 금속간화합물의 연소합성 코팅", 한국주조공학회지, 31(2), pp.83~86 (2011), 한국주조공학회
- 이한영, "알루미늄 주물의 용탕열을 이용한 Ni-Al계 금속간화합물의 연소합성 코팅에 미치는 Ball-Milling의 영향", 대한금속·재료학회지, 52(2), pp.123~128 (2014), 대한금속·재료학회[DOI]
- 조용재, "어닐링처리한 Ni-50at%Al 압분체의 연소합성 거동", 대한금속·재료학회지, 49(10), pp.790~796 (2011), 대한금속·재료학회
- Research Group for Combusion Synthesis, "Chemistry of Combusion Synthesis", pp.45~ (1992), TIC book Co
- Ikwnaga, A., "Fabrication of Ni-Al Intermetallic Compound Layer on Spheroidal Graphite Cast Iron Substrate by SHS reaction", J. Japan Foundry Eng. Soc, 68(5), pp.417~422 (1996)