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比比谁更硬,这东西让钻石甘拜下风 - 站长搜索
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比比谁更硬,这东西让钻石甘拜下风

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2014-10-06 17:30:05 转载来源: 网络整理/侵权必删

站长搜索(www.adminso.com):比比谁更硬,这东西让钻石甘拜下风 长久以来,人们认为世界上最坚硬的物质是钻石,近来科学家发现了一种比钻石更加坚硬的物质――“立方体氮化硼”。这种透明晶体的维氏硬度达到了108G帕,钻石的维氏硬度为100G帕

站长搜索(www.adminso.com):比比更硬,这东西钻石甘拜下风

长久以来,人们认为世界上最坚硬的物质是钻石,近来科学家发现了一种比钻石更加坚硬的物质――“立方体氮化硼”。这种透明晶体的维氏硬度达到了108G帕,钻石的维氏硬度为100G帕。

这种坚硬物质的奥秘来自于它的纳米微观结构,就像洋葱一层层折叠而成,又像俄罗斯套娃层层嵌套在一起。当置于1800摄氏度和150亿帕(68000个大气压)的条件下,氮化硼就能形成这样的结构。

通常情况下,为了使物质更加坚硬,科学家设法减小晶体中颗粒的大小。但是这种方法并不是一直奏效:当颗粒物的尺度缩小到10纳米尺寸以下的时候,其内在的结构缺陷几乎和颗粒一样大,反而削弱了结构的强度。

“立方体氮化硼”有着优良的热稳和化学稳定性,硬度比钻石大。这种超硬物质在机械、钻探、研磨以及切削等领域有着非常广泛的应用。

标签: 比比 更硬 东西 钻石 甘拜下风


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