High heat load properties of high purity CVD tungsten
High heat load properties of high purity CVD tungsten
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DOI：
10.1016/s0022-3115(02)01042-5
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发表时间：
2002-12
影响因子：
3.1
通讯作者：
S. Tamura;K. Tokunaga;N. Yoshida
中科院分区：
文献类型：
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作者：
S. Tamura;K. Tokunaga;N. Yoshida
利用电子束进行了高热负荷实验，研究了化学气相沉积钨包覆钼（CVD-W/Mo）在聚变相关条件下的性能。显微组织观察表明，在300次热负荷（23 MW/m2持续30 s，典型表面温度：800 °C）后，没有形成裂纹。结果表明，CVD-W/Mo复合材料在循环热载荷作用下具有良好的热疲劳性能。在1300 °C以上，再结晶开始，热应力作用下易产生裂纹。在该温度范围内，裂纹扩展速度比粉末冶金钨的裂纹扩展速度要小。认为高纯度的CVD-W抑制了再结晶脆化。
High heat load experiments using electron beams were carried out to investigate the performance of chemical vapor deposition-tungsten coated molybdenum (CVD-W/Mo) under fusion relevant conditions. Microstructural observation showed that no crack had been formed after 300 shot heat load (23 MW/m2for 30 s, typical surface temperature: 800 °C). The results indicate that the CVD-W/Mo had good thermal fatigue property under the cyclic heat load. Above 1300 °C at which the recrystalization would start cracks were formed easily by thermal stress. Crack propagation was apt to be less than that of powder metallurgy tungsten in the temperature range. It is considered that the high purity of CVD-W suppressed the embrittlement due to the recrystallization.