添加微量ZrC对钨材料组织演变和性能的影响（英文）  

Microstructure Evolution and Properties of Tungsten Reinforced by Additions of ZrC

作　　者：李鹏飞[1] 范景莲[1] 韩勇[1] 章曼[1] 成会朝[1] 田家敏[1] Li Pengfei;Fan Jinglian;Han Yong;Zhang Man;Cheng Huichao;Tian Jiamin(State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China)

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《稀有金属材料与工程》2018年第6期1695-1699,共5页Rare Metal Materials and Engineering

基　　金：National Magnetic Confinement Fusion Program(2014GB115000);Research Fund for the Doctoral Program of Higher Education of China(20130162130002)

摘　　要：为了批量化制备面向等离子体用高性能钨材料,在钨中添加少量ZrC第二相粒子提高钨的性能,系统的研究了W-ZrC材料在1150~2000℃常压氢气气氛烧结下的致密化行为、晶粒和第二相颗粒的长大行为,并在优化工艺下研究了ZrC含量对材料性能和组织的影响。结果表明,W-ZrC复合粉末在1300℃开始形成非常细小钨晶粒,晶粒在1600℃之前增长速率很大,在1600℃之后速率变缓。在优化的烧结工艺下,W-ZrC材料的相对密度和抗拉伸强度最高分别可达到99.6%和460 MPa。ZrC以为0.1~2μm粒子均匀分散在W基体的晶界和晶粒内部。ZrC可以有效地阻碍W晶界的迁移,有效的将钨的晶粒由100μm细化至30μm左右。ZrC改变了钨材料的断裂模式,并提高其强度和韧性。In order to prepare high performance tungsten used as plasma face material, a trace amount of ZrC was added into tungsten, and the densification behavior, properties and microstructure evolution of W-ZrC composites sintered at temperatures in the range of 1150-2000 ℃ in flowing hydrogen atmosphere were investigated. Results show that W-ZrC composite powders begin to form fine tungsten grains at 1300 ℃. The growth rate of grains is high below 1600 ℃, and then slows down. The maximum relative density and tensile strength are 99.6% and 460 MPa under the optimum sintering process, respectively. ZrC particles are uniformly dispersed at grain boundaries and in grains interior with particle size from 0.1 μm to 2 μm. Minor ZrC can effectively prevent the migration of grain boundaries and refine grain sizes from 100 μm of pure tungsten to 30 μm of W-ZrC composites. Minor ZrC can change the fracture mode and improve the strength and toughness of tungsten.

关 键 词：碳化锆 致密化 微观结构演化 晶粒细化 

分 类 号：TG146.411[一般工业技术—材料科学与工程]