Abstract
In this work, a feasibility study has been conducted on the formation of NiTi intermetallic compound coating by plasma transferred arc (PTA) surfacing process. The filler materials used were alloyed powder of NiTi and physically mixed powder of nickel and titanium. Wear characteristics of the coatings were evaluated by a modified Okoshi-type wear tester.It was found that it is possible to produce intermetallic compound coatings from the mixed powder as well as alloyed powder by PTA surfacing process. The wear resistance of the coatings formed from alloyed powder (the NiTi coating) is superior to the resistance of Stellite #6 coatings. The coatings formed from mixed powder (the Ni+Ti coating) have wear resistance similar to that of Stellite #6 coatings. X-ray diffraction result indicates that the NiTi coatings mainly consist of NiTi phase, whereas the Ni+Ti coatings principally consist of NiTi and FeTi phases. Hardness values of both NiTi and Ni+Ti coatings reached to 800HV or more, and then minute cracks were observed in both coatings.
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