面向等离子体W/Cu FGM的抗热冲击性能

Thermal Shock Behavior of W/Cu Functionally Gradient Material

采用循环水淬和脉冲激光冲击法并结合有限元计算考察和分析了用超高压梯度烧结方法制备的W/Cu FGM的抗热震性能.结果表明,W/Cu FGM经受50次800℃～25℃水淬冲击和100 MW/m2以上的激光循环冲击,没有出现界面破坏现象;但随着热冲击次数及冲击能量密度的增加,金属W表面产生了裂纹、晶间断裂以及出现液相及蒸发现象.与非梯度材料相比,W/Cu FGM有优异的抗热冲击性能,大致可以经受100 MW/m2 350次以上的激光循环冲击.

Thermal shock behavior of W/Cu FGM fabricated by graded sintering under ultrahigh pressure (GSUHP) was investigated and analyzed via water-quenching, cyclic pulsed laser impact and finite element analysis. It was found that no exfoliation but thermal stress induced cracks occur on the W surface of the as-fabricated W/Cu FGM after water-quenching with a temperature range of 800degreesC to 25degreesC and pulsed laser impact under energy density of more than 100MW/m(2), respectively. With increase of impact cycles and power impingement, intragrannular grain rupture, liquid layer removal and even evaporation was observed on the W surface of W/Cu FGM. However, compared with W/Cu duplex W/Cu FGM possesses very good thermal shock resistance performance, which could approximately endured more than 350 cyclic thermal impacts with an energy density of 100 MW/m(2).