Shock consolidation of diamond powders
Shock consolidation of diamond powders
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DOI：
10.1007/bf01161192
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发表时间：
1987-09
影响因子：
4.5
通讯作者：
T. Akashi;A. Sawaoka
中科院分区：
文献类型：
--
作者：
T. Akashi;A. Sawaoka
细金刚石粉和粗金刚石粉在峰值压力为77、90和108 GPa时进行冲击压实。研究了金刚石粉末在冲击压缩作用下的致密化和固结机理。金刚石粉末的致密化行为在很大程度上取决于起始材料的粒度。细粒金刚石粉末主要通过塑性变形致密化，粗粒金刚石粉末主要通过颗粒断裂致密化。压实后金刚石样品的相对密度随金刚石初始粒径的增大和冲击压力的增大而增大。金刚石粉末在激波压缩下的固结机制与致密化机制密切相关，且取决于金刚石的初始粒度。在90 GPa的冲击压力下，2 ~ 4 μm级和10 ~ 20 μm级的颗粒是理想的起始材料，以生产粘结良好的金刚石压块。在90 GPa的冲击压力下，2 ~ 4 μm级和10 ~ 20 μm级的金刚石粉末获得了显微硬度大于80 GPa的压实体，其相对密度分别为88.5%和91.0%。
Fine and coarse diamond powders were shock-compacted at peak pressures of 77, 90, and 108 GPa. The densification and consolidation mechanisms of diamond powders under shock compression were investigated. The densification behaviour of the diamond powders depended strongly on the particle size of the starting materials. Fine diamond powders were densified primarily by plastic deformation, while coarse diamond powders were densified mainly by particle fracture. The relative densities of the compacted diamond samples increased with an increase in the initial particle size of the diamond and with shock pressure. The consolidation mechanism of the diamond powders under shock compression was closely related to the densification mechanism, and depended on the initial particle size of the diamond. At a shock pressure of 90 GPa, particle sizes of 2 to 4 μm grade and 10 to 20 μm grade were desirable as the starting material in order to produce well-bonded diamond compacts. Diamond compacts having microhardness values over 80 GPa were obtained from 2 to 4 μm grade and 10 to 20 μm grade diamond powders at a shock pressure of 90 G Pa, and their relative densities were 88.5% and 91.0%, respectively.