硬度计压头形状和负荷的大小对显微硬度的影响  

Influence of sclerometer indentor shape and load on hardness value

作　　者：刘进[1] 姜伟 寇自力[3] 

机构地区：[1]荆楚理工学院电子信息工程学院,湖北荆门448000 [2]国家特种矿物材料工程技术研究中心,广西桂林541004 [3]四川大学原子与分子物理研究所,四川成都610065

出　　处：《超硬材料工程》2008年第1期30-33,共4页Superhard Material Engineering

摘　　要：硬度是衡量超硬材料烧结体的主要特性之一。然而目前国内外还没有超硬材料烧结体硬度测量的统一的标准。文章通过硬度计测量标准块的硬度值总结如下:施加相同力而采用不同形状的压头所得结果不同,采用相同的压头而施加不同的力所得结果也不一样;随着施加负荷的增大,压痕周围产生的破碎形变也在增大,这将影响测量值的准确性。因此,压头的形状和所施加的负荷是影响硬度值的一个重要因素。通过分析得知,在测试中应采用努普压头并且施加小负荷的力[。1,3]Hardness is one of the main characters of ultrahard material sinters. But now there is no uniform standard to measure the sinter hardness in the world. In this paper, by testing the standard sample a conclusion was made as follows： the hardness value is different with different indentor by the same testing force and the result is consistent with the former with the same indentor by the different load. The distortion around the indentation is becoming serious with the load increasing, which inevitably will affect the precision of the hardness value. So the hardness value is significantly influenced by the indentor shape and normal load used. The Knoop indentor, which produces a wedgeshaped indentation in the form of an elongated parallelogram, is generally considered the most accurate for the materials by analyzing. In addition, a small load is very important for the exactness.

关 键 词：维氏硬度 金刚石压头 努普 烧结体 

分 类 号：TH871.5[机械工程—仪器科学与技术]