Particles and crystallites under electrical explosion of wires
Particles and crystallites under electrical explosion of wires
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DOI：
10.1088/0957-4484/19/14/145710
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发表时间：
2008-04
期刊：
影响因子：
3.5
通讯作者：
V. Sedoi;Y. Ivanov
中科院分区：
文献类型：
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作者：
V. Sedoi;Y. Ivanov
产生的数据为快速焦耳加热下的颗粒形成提供了新的线索：颗粒的大小取决于金属微晶的初始尺寸。用X射线衍射法测定了晶体的尺寸为相干散射区d(RCS)的尺寸。粉末的中表面粒度d(S)是由比表面积S(BET)估算的。对铝、铟、铜、钛等不同金属进行了研究。对于给定的金属，d(RCS)在25~77 nm之间变化，d(S)在45~200 nm之间变化，d(S)越小，d(RCS)越小。根据这一证据，从加热开始，焦耳耗散功率在晶界处较高。因此，即使在导线中引入的能量等于升华能量，也会形成“液滴气体”，而不是“原子气体”。
The data produced shed new light on particle formation under fast Joule heating: the particle size depends on the initial size of the crystallites of a metal. The size of crystallites has been determined by the x-ray diffraction method as the size of the region of coherent scattering d(RCS). Median-surface particle sizes d(S) of the powder have been evaluated from the specific surface area S (BET). Such different metals as Al, In, Cu, Ti have been investigated. For the given metals, d(RCS) varies from 25 to 77 nm, d(S) of the powder varies from 45 to 200 nm, and d(S) is the smaller, the smaller is d(RCS). On this evidence, from the beginning of heating, the power of Joule dissipation is higher at the boundaries of crystallites. As a result, even at the energy introduced in the wire equal to the sublimation energy, ‘a gas of drops’ is formed instead of ‘a gas of atoms’.