| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2013: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2011: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
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| Research Abstract |
Stellite alloy is a high erosion resistant material and is widely used for valves. However, this alloy is difficult to fabricate and has a long half period for radio activated environment. Therefore, it was required that the replacement material should be developed. In this study, a PTA (plasma transferred arc) weld overlay was fabricated using the mixtures of pure titanium and nickel powders. The nickel content of weld overlay ranged from 40 at% to 80at%. It was found that the weld overlay of Ti40at%-Ni60at% show the highest erosion resistance. The erosion resistance of this weld overlay was improved with the 1hour heat treatment at 950 degree C. The erosion resistance of these Ti-Ni weld overlays was similar to that of the stellite alloy. It was concluded that the Ti-Ni weld overlay is the replacement material by the stellite alloy.
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