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Vol.51, No.10, 753 ~ 761, 2013
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| Title |
| Effect of NiAl3 on Mechanical Properties and Sintering of (W,Ti)C Hard Materials |
| 박나라 Na Ra Park , 나권일 Kwon Il Na , 권한중 Han Jung Kwon , 임재원 Jae Won Lim , 손인진 In Jin Shon |
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| Abstract |
| Co or Ni was added to cemented (W,Ti)C as a binder for forming composite structures. The high cost of Co or Ni and the low corrosion resistance of (W,Ti)C-Co or (W,Ti)C-Ni cermet have generated interest in recent years in the search to find alternative binder phases. It has been reported that aluminides have a higher oxidation resistance, a higher hardness and are cheaper materials than Co and Ni. Using a pulsed current activated sintering (PCAS) method, the densification of (W,Ti)C and (W,Ti)C-NiAl3 hard materials were accomplished within 3 minutes. The advantage of this process is not only rapid densification to near theoretical density but also the prohibition of grain growth in nano-structured materials. Highly dense (W,Ti)C and (W,Ti)C-NiAl3 with a relative density of up to 99% were obtained within 3 minutes by PCAS under a pressure of 80 MPa. The average grain sizes of the (W,Ti)C was lower than 100 nm. The hardness and fracture toughness of the dense (W,Ti)C and (W,Ti)C-NiAl3 produced by PCAS were also investigated. (Received March 22, 2013) |
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| Key Words |
| nanomaterials, sintering, hardness, fracture toughness |
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