CAJ | 학술논문

采用高能球磨和放电等离子体烧结技术制备纯钨、氧化物弥散强化钨和碳化物弥散强化钨.为了评价钨在瞬态热冲击下的性能,采用强流脉冲离子束,在热流密度高达160 MW/(m2·s-1/2)的条件下对4种不同晶粒尺寸的钨进行抗热冲击试验.与商品钨相比,弥散强化钨在瞬态高热流作用下显现出不同的行为.氧化物弥散强化钨显现出较差的抗热冲击性能,这主要是由于低熔点的第二相Ti和Y2O3的引入,从而使得钨的表面发生熔融、起泡和开裂.而碳化物弥散强化钨合金则显现出较好的抗热冲击性能.
채용고능구마화방전등리자체소결기술제비순오、양화물미산강화오화탄화물미산강화오.위료평개오재순태열충격하적성능,채용강류맥충리자속,재열류밀도고체160 MW/(m2·s-1/2)적조건하대4충불동정립척촌적오진행항열충격시험.여상품오상비,미산강화오재순태고열류작용하현현출불동적행위.양화물미산강화오현현출교차적항열충격성능,저주요시유우저용점적제이상Ti화Y2O3적인입,종이사득오적표면발생용융、기포화개렬.이탄화물미산강화오합금칙현현출교호적항열충격성능.
Pure tungsten,oxide dispersion strengthened tungsten and carbide dispersion strengthened tungsten were fabricated by high-energy ball milling and spark plasma sintering process.In order to evaluate the properties of the tungsten alloys under transient high heat flues,four tungsten samples with different grain sizes were tested by high-intensity pulsed ion beam with a heat flux as high as 160 MW/(m2·s-1/2).Compared with the commercial tungsten,the surface modification of the oxide dispersion strengthened tungsten by high-intensity pulsed ion beam is completely different.The oxide dispersion strengthened tungsten shows inferior thermal shock response due to the low melting point second phase of Ti and Y2O3,which results in the surface melting,boiling bubbles and cracking.While the carbide dispersion strengthened tungsten shows better thermal shock response than the commercial tungsten.