钾含量对钨材热稳定性的影响  

Effect of Potassium Content on Thermal Stability of Tungsten Materials

作　　者：杨吉 袁觅文 魏修宇 胡晓康 李志翔 傅崇伟 Yang Ji;Yuan Miwen;Wei Xiuyu;Hu Xiaokang;Li Zhixiang;Fu Chongwei(CMT Rare Metal Advanced Materials(Hunan)Co.,Ltd.,Changsha Hunan 410000,China)

机构地区：[1]中钨稀有金属新材料(湖南)有限公司,湖南长沙410000

出　　处：《硬质合金》2024年第5期369-377,共9页Cemented Carbides

基　　金：中国五矿集团有限公司科技专项计划项目(WKZB2112BJM501844)。

摘　　要：核聚变能源因其高能量密度、清洁和安全性,被认为是未来理想能源之一。为改善钨作为核聚变堆第一壁和偏滤器材料的性能,通过掺杂钾(K)元素形成钾泡弥散强化钨合金(KW),是提高钨的高温稳定性能的方法之一。本文研究了不同钾含量下钾钨的微观结构和再结晶行为。通过粉末冶金方法制备了高致密度的KW合金,并进行了烧结和轧制处理。结果表明,钾的添加显著提高了钨的再结晶温度,其中钾含量较高的合金(81μg/g)表现出最高的再结晶温度(1 500℃)。SEM分析显示,钾泡主要分布在晶界处,有效钉扎晶界,阻碍晶界迁移,提升材料的高温热稳定性,为钨基合金在核聚变堆中的应用提供了优化参考方向。Nuclear fusion energy is considered to be one of the ideal energy sources in the future due to its high energy density,cleanness,and safety.In order to improve the performance of tungsten as the first wall and divertor material of nuclear fusion reactor,tungsten alloy(KW)strengthened by potassium(K)bubble diffusion via K doping is one of the methods to improve the high temperature stability of tungsten.In this paper,the microstructure and recrystallization behavior of K-doped tungsten with different K contents were studied.High-density KW was prepared by powder metallurgy,and sintering and rolling were carried out.The results show that the addition of K significantly increases the recrystallization temperature of tungsten,among which the alloy with higher K content(81µg/g)shows the highest recrystallization temperature(1500℃).Scanning electron microscope(SEM)analysis shows that K bubbles are mainly distributed at the grain boundaries,effectively pinning the grain boundaries,hindering the migration of grain boundaries,and improving the high temperature thermal stability of the material,which provides an optimization reference direction for the application of tungsten-based alloys in nuclear fusion reactors.

关 键 词：钾钨 再结晶温度 核聚变 热稳定性 钾泡 

分 类 号：TG1[金属学及工艺—金属学]