孔隙率对铌硅粉末混合物冲击反应的影响

凌绪玉; 刘福生; 汪贻高

doi:10.11858/gywlxb.20190851

孔隙率对铌硅粉末混合物冲击反应的影响

doi: 10.11858/gywlxb.20190851

凌绪玉^{1, 2,},
刘福生^1,*, ,,
汪贻高¹

1.
西南交通大学高温高压物理研究所，四川成都　610031
2.
西南民族大学电气信息工程学院应用物理系，四川成都　610041

基金项目: 国家自然科学基金（11574254）

详细信息

作者简介:
凌绪玉(1974－), 女, 博士研究生, 主要从事高压材料的合成研究. E-mail: lingxymx@163.com

通讯作者:
刘福生(1966－), 男, 博士, 研究员, 主要从事凝聚态物理、冲击波技术研究. E-mail: fusheng_l@163.com

中图分类号: O521.23
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出版历程
- 收稿日期: 2019-10-30
- 修回日期: 2019-11-15

Influence of Initial Porosity on Shock Chemical Reaction of Nibium-Silicon Powder Mixture

LING Xuyu^{1, 2
,},
LIU Fusheng^{1,*
, ,},
WANG Yigao¹

1.
Institute of High Pressure and High Temperature Physics, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
2.
Department of Applied Physics, College of Electrical and Information Engineering, Southwest University for Nationalities, Chengdu 610041, Sichuan, China

摘要

摘要: 借助二级轻气炮加载平台和飞片撞击技术，在高冲击速度下实现不同初始孔隙率铌硅粉末混合物的冲击回收。对回收产物进行表征分析并探讨高冲击速度下孔隙率对铌硅粉末冲击化学反应的影响，实验结果表明：低孔隙率（10%）铌硅粉末混合物几乎不发生反应；20%孔隙率铌硅粉末发生不完全化学反应并生成了NbSi₂；高孔隙率（35%）样品在相同冲击速度（飞片速度约为2.35 km/s）下发生完全反应获得单组分Nb₅Si₃。在高孔隙率的粉末混合物中，孔隙崩塌产生的高温是导致铌硅粉末反应物发生完全反应的主要原因。
- 铌硅粉末混合物 /
- 高冲击速度 /
- 冲击回收 /
- 孔隙率 /
- 冲击反应
Abstract: By employing the two-stage light gas gun and flyer impact technology, the impact recovery experiments of nibium-silicon powder mixtures with different initial porosity at high impact intensity were achieved. The recycled products were characterized to investigate the effect of porosity on the impact chemical reaction of nibium-silicon powder at high impact strength. The results showed that the sample with low porosity (10%) was hardly reacted; When the porosity is 20%, the nibium-silicon powder experienced a partial chemical reaction to form a NbSi₂compound; As the porosity was increased to 35%, a complete reaction has occurred to generate a Nb₅Si₃ intermetallic compound under the same impact strength (the flyer velocity about 2.35 km/s). Such results have shown that the complete reaction in the powder reactant of high-porosity powder mixture is mainly due to the high temperature generated by the pore collapse.
- nibium-silicon powder mixtures /
- high impact velocity /
- shock recovery /
- porosity /
- shock reaction

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图 1 冲击回收实验装置示意图和实物

Figure 1. Schematic and photographs of the assembly for the shock recovery experiment

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图 2 冲击回收前、后铜回收盒

Figure 2. Copper capsule before and after shock loading

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图 3 不同孔隙率铌硅粉末冲击回收产物的XRD 结果

Figure 3. XRD patterns of the recycled samples of Nb-Si powder mixtures with different porosity

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图 4 10%孔隙率铌硅粉末冲击回收产物的SEM结果和EDS分析

Figure 4. SEM morphology and EDS spectra of the recycled samples of Nb-Si powder mixtures with the porosity of 10%

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图 5 20%孔隙率铌硅粉末冲击回收产物的SEM结果和EDS分析

Figure 5. SEM morphology and EDS spectra of the recycled samples of Nb-Si powder mixtures with the porosity of 20%

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图 6 35%孔隙率铌硅粉末冲击回收产物的SEM结果和EDS分析

Figure 6. SEM morphology and EDS spectra of the recycled samples of Nb-Si powder mixtures with the porosity of 35%

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图 7 不同孔隙率铌硅粉末冲击回收产物的DSC曲线

Figure 7. DSC curves of the shock recycled samples of Nb-Si powder mixtures with different porosity

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表 1 不同孔隙度的粉末混合物的冲击回收实验参数

Table 1. Shock loading conditions of Nb-Si powder mixtures with different porosity

Sample	Flyer velocity/ (km·s⁻¹)	Density/ (g·cm⁻³)	Porosity/ %	Shock pressure/GPa	Second shock pressure/GPa	Shock temperature/K
Nb-Si-P1		5.505	10	45	60	1 173
Nb-Si-P2	2.35 ± 0.02	4.895	20	39	60	1 625
Nb-Si-P3		3.980	35	29	60	2 256

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