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采用粉末层铺法和无压烧结工艺制备了组元分布指数p分别为0.1、0.3、0.7和1的4种Y_2O_3-W梯度材料,并进行了4种材料在600℃和400℃温差下的急冷淬火循环热震试验。结果表明:在600℃温差下,经2次循环热震后,4种材料均失效。在400℃温差下,经40次循环热震后,4种材料均未发生失效断裂。随着循环热震次数的增多,热裂纹的长度和密度也随之增加。Y_2O_3-W梯度材料的抗热震性能随着组元分布指数p的增大逐渐增强。当组元分布指数p=1时,Y_2O_3-W梯度材料具有最好的抗热震性能。
Four kinds of Y_2O_3-W graded materials with component distribution index p of 0.1, 0.3, 0.7 and 1 were prepared by powder layer laying and pressureless sintering. Four kinds of graded Y_2O_3-W graded materials with temperature difference of 600 ℃ and 400 ℃ Quenching quenching cycle thermal shock test. The results show that all the four kinds of materials fail after two cycles of thermal shock at a temperature difference of 600 ℃. Under the temperature difference of 400 ℃, after 40 cycles of thermal shock, none of the four materials failed to fracture. As the number of cyclic thermal shocks increases, the length and density of hot cracks also increase. The thermal shock resistance of Y_2O_3-W graded material gradually increases with the increase of component index p. When the element distribution index p = 1, Y_2O_3-W gradient material has the best thermal shock resistance.