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.
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.
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