Elevated temperature ablation resistance and thermophysical properties of tungsten matrix composites reinforced with ZrC particles
Elevated temperature ablation resistance and thermophysical properties of tungsten matrix composites reinforced with ZrC particles
复制标题
DOI：
10.1023/a:1017989913219
复制
发表时间：
2001-01-01
影响因子：
4.5
通讯作者：
Zhou, Y
中科院分区：
文献类型：
--
作者：
Song, GM;Wang, YJ;Zhou, Y
为了提高目前火箭发动机舵用渗铜钨基复合材料（Cu/W）的抗高温烧蚀性能，研制了一种体积分数为30%的碳化锆颗粒增强钨基复合材料（ZrCp/W），并对其高温烧蚀性能和热物理性能进行了研究。ZrCp/W的质量烧蚀率和线烧蚀率均远低于Cu/W，表明ZrC颗粒的加入显著提高了钨基复合材料的抗烧蚀性能。ZrCp/W的烧蚀机理主要是W和ZrC颗粒的热化学氧化。采用自制的动态响应多波长高温计测量烧蚀表面温度，采用热电偶测量背表面温度。成功地在线检测了烧蚀表面和背面的重要温度曲线，表明ZrCp/W具有良好的抗热震性能。ZrC颗粒的存在显著降低了ZrCp/W复合材料的热导率和热扩散率，有利于提高复合材料的高温抗烧蚀性能。ZrCp/W具有优良的高温抗烧蚀性能是由于其较低的导热系数、热扩散系数、抗氧化性和较高的熔点。ZrCp/W复合材料的优良性能使其可以替代Cu/W材料作为火箭发动机的舵面材料。(C)2001 Kluwer Academic Publishers.
In order to improve the elevated temperature ablation resistance of the copper infiltrated tungsten materials (Cu/W) which are used as the rudders of the rocket motors at present, a new kind of tungsten matrix composites reinforced by 30 vol% zirconium carbide particles (ZrCp/W) was developed, and the elevated temperature ablation resistance and thermophysical properties of the new materials were investigated. The values of the mass ablation rate and linear ablation rate of ZrCp/W were much lower than that of Cu/W, which indicated that the addition of ZrC particles in tungsten matrix remarkably increased the ablation resistance. Thermal thermochemical oxidation of tungsten and ZrC particles was the main ablation mechanism of ZrCp/W. A self-made dynamic responding multi-wavelength pyrometer was employed to measure the ablated surface temperatures and a thermal couple was employed to measure the back surface temperatures. The important temperature curves of the ablated surface and back surface of the specimens were successfully detected online, which indicated that ZrCp/W has good thermal shock resistance. The present of ZrC particles in tungsten matrix remarkably decreased the thermal conductivity and thermal diffusivity of the ZrCp/W composites, which is very useful for increasing the elevated temperature ablation resistance of the composites. The excellent elevated temperature ablation resistance of ZrCp/W is attributed to the lower thermal conductivity, lower thermal diffusivity, oxidation resistance and high melting points. The good properties of ZrCp/W makes it be suitable for the rudders for rocket motors instead of Cu/W. (C) 2001 Kluwer Academic Publishers.