我国科学家研制出硬度超金刚石单晶新材料 Chinese scientists have developed a hardness super diamond new material 燕山大学亚稳材料制备技术与科学国家重点实验室田永君教授与中外科学家合作,采用高温高压技术成功地合成出硬度超过金刚石单晶的纳米孪晶结构立方氮化硼材料,论文发表在2013年1月17日出版的《自然》杂志上。鉴于成果的重要性,《自然》杂志在该期封面和目录页对田永君等人的论文进行了导读,并配发了合成样品的原图,导读题目和内容“硬时代:现在立方氮化硼在其极硬态与金刚石相匹敌”形象而生动地介绍了该文。 Yanshan University professor Tian Yongjun of metastable materialscooperation with Chinese and foreign scientists State Key Laboratory of science and technology, the successful synthesis of nano twinned structure of cubic boron nitride material hardness more than diamond single crystal by high temperature high pressure technology, the paper published in the January 17, 2013 issue of the journal " nature". In view of the importance of achievement, " natural " magazine in this period cover and directory page of Tian Yongjun's thesisguidance, with the original synthetic samples, introduction to the topic and content of " hard times: now cubic boron nitride in the hard state and the diamond match " vividly describes the. 上世纪50年代中叶,科学家们相继人工合成了金刚石和立方氮化硼单晶。从此,他们就成为工业界广泛使用的超硬材料,在现代加工业中发挥着不可替代的作用。超硬是指维氏硬度大于40 GPa,而极硬是指维氏硬度大于80 GPa。一直以来,金刚石号称是自然界中最硬的,硬度为60~100 GPa;立方氮化硼次之,硬度为30~43 GPa。由于金刚石的抗氧化温度低(约600℃)且与铁基材料反应,只能用于陶瓷类材料和铝、镁合金的加工。立方氮化硼的抗氧化温度高(约1100℃)且不与铁基材料反应,因此在钢铁材料加工行业中获得了广泛应用。遗憾的是,人工合成立方氮化硼单晶的硬度还不到 (Editor:admin) |