Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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Effects of Ball Milling on Sliding Wear Behavior of Ni-Al Intermetallics Coated on Mild Steel through Induction Heating Process

고주파 연소합성 코팅된 Ni-Al계 금속간화합물의 미끄럼 마모 특성에 미치는 볼 밀링의 영향

  • Lee, Han-Young (Dept. of Advanced Materials Engineering, Keimyung University)
  • Received : 2018.09.14
  • Accepted : 2018.11.25
  • Published : 2018.12.31
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Abstract

Ball-milling for reactant powders in advance and using an induction heating system for Ni-Al intermetallic coating process are known to enhance the reactivity of combustion synthesis. In this work, the effects of the charging weight ratio of ball to powder in ball-milling for reactant Ni-Al powders and the synthesizing temperature in induction heating on sliding wear behavior of the coating layers are investigated. Sliding wear behavior of the coating layers is examined against a tool steel using a pin-on-disc type sliding wear machine. As results, wear of the coating layer ball-milled without ball was severely worn out at the sliding speed of 2m/s, regardless of the synthesizing temperature in induction heating. However, the wear rate of the coating layers at the sliding speed was remarkably decreased with increasing the charging weight ratio of ball in ball-milling for reactant powders. This can be explained by the fact that the void in the coating layer is disappeared and the coating layer is densified by the ball-milling. The evidence showed that pitting damages were disappeared on the worn surface of ball-milled coating layer. Consequentially, the Ni-Al intermetallic coating layer could have better wear resistance at all sliding speed ranges with the ball-milling for reactant powders in advance.

Keywords

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Fig. 1. Optical micrographs of Ni-Al intermetallic layer coated on steel substrate through induction heat process.

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Fig. 1. Optical micrographs of Ni-Al intermetallic layer coated on steel substrate through induction heat process.

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Fig. 2. Variation of wear loss as a function of sliding distance depended on the ball milling conditions at three different sliding speeds (Induction heating at 750oC).

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Fig. 2. Variation of wear loss as a function of sliding distance depended on the ball milling conditions at three different sliding speeds (Induction heating at 750oC).

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Fig. 3. Wear rate as a function of sliding speed depended on the ball milling conditions (Induction heating at 750oC).

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Fig. 3. Wear rate as a function of sliding speed depended on the ball milling conditions (Induction heating at 750oC).

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Fig. 4. Wear rate as a function of sliding speed depended on the ball milling conditions (Induction heating at 650oC).

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Fig. 4. Wear rate as a function of sliding speed depended on the ball milling conditions (Induction heating at 650oC).

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Fig. 5. Optical micrographs on worn surface of each coating layer synthesized at 650oC after testing at a sliding speed of 2m/s and on its counter material.

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Fig. 5. Optical micrographs on worn surface of each coating layer synthesized at 650oC after testing at a sliding speed of 2m/s and on its counter material.

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Fig. 6. SEM micrographs on worn surface of each coating layer synthesized at 650oC after testing at a sliding speed of 2m/s.

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Fig. 6. SEM micrographs on worn surface of each coating layer synthesized at 650oC after testing at a sliding speed of 2m/s.

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Fig. 7. Electron image on worn surface of B10 layer coated at 650oC after testing at a sliding speed of 2m/s and the results of EDX analysis.

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Fig. 7. Electron image on worn surface of B10 layer coated at 650oC after testing at a sliding speed of 2m/s and the results of EDX analysis.

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Fig. 8. Variation of profiles curve on worn surface of counter materials against each coating layer synthesized at 650oC after testing at a sliding speed of 2 m/s.

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Fig. 8. Variation of profiles curve on worn surface of counter materials against each coating layer synthesized at 650oC after testing at a sliding speed of 2 m/s.

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Fig. 9. Optical micrographs on worn surface of NB layer coated at 750oC tested at three different sliding speeds and on its counter material.

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Fig. 9. Optical micrographs on worn surface of NB layer coated at 750oC tested at three different sliding speeds and on its counter material.

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Fig. 10. Variation of profiles curve on worn surface of counter materials against NB layer coated at 750oC tested at three different sliding speeds.

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Fig. 10. Variation of profiles curve on worn surface of counter materials against NB layer coated at 750oC tested at three different sliding speeds.

Table 1. Conditions of sliding wear test

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Table 1. Conditions of sliding wear test

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