科研之友
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摘要
Tungsten is considered in fusion technology as structural material in divertor for future application in DEMO. Helium cooled divertor design includes joints between W and W alloys. Present study analyzed the brazeability of pure tungsten using a commercial high temperature nickel-based alloy in vacuum furnace. Although nickel application of interlayers in the W-W joints of the structural zone is not desirable, as it can promote helium accumulation under irradiation and a subsequent embrittlement enhancement of the brazed joint, this experimental study could help to define conditions of the braze application inside the W-W joints, besides obtaining useful information to control the brazing conditions and avoid undesirable brazeability problems (cracking, dilution, W recrystallization, grain growth, etc.). High vacuum brazing tests have been carried out at temperatures higher than the liquidus one of the braze alloy. Characterization studies, both microstructural and mechanical, of the W-W brazed specimens demonstrated the development of new brazing fillers which meet requirements such as strength and flexibility for adaptation to the shape of the joint.
- 出版日期2014-2
