Growth fusion of submicron spherical boron carbide particles by repetitive pulsed laser irradiation in liquid media
Growth fusion of submicron spherical boron carbide particles by repetitive pulsed laser irradiation in liquid media
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DOI：
10.1007/s00339-010-5745-6
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发表时间：
2010-06-01
影响因子：
2.7
通讯作者：
Koshizaki, Naoto
中科院分区：
文献类型：
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作者：
Ishikawa, Yoshie;Feng, Qi;Koshizaki, Naoto
我们研究了通过激光辐照分散在有机溶剂中的硼纳米颗粒来制备B4 C亚微米颗粒。形成的颗粒的球形形状表明，瞬时熔体形成和淬火凝固参与颗粒形成过程。在相对较低的激光能量密度（1.5 J cm（-2）pulse（-1））下，B4 C颗粒通过颗粒的反复熔化和熔合而随着照射时间的延长逐渐变大，并且B4 C产率随着照射时间的增加而增加，在600 min的照射下达到90%。在较高的激光能量密度下，由于硼或B4 C的爆炸烧蚀形成H3 BO 3，B4 C产率降低，因此仅观察到较大的B4 C颗粒。有机溶剂的介电常数也影响所产生的B4 C颗粒的尺寸，可能是由于颗粒聚集的程度。因此，该技术可以提供一种新的方法来制备球形亚微米陶瓷材料，如碳化物，与简单和安全的过程。
We studied the fabrication of B4C submicron particles by laser irradiation of boron nanoparticles dispersed in an organic solvent. The spherical shape of the formed particles suggests that instantaneous melt formation and solidification by quenching are involved in the particle-forming process. B4C particles gradually became larger with irradiation time at relatively low laser fluence (1.5 J cm(-2) pulse(-1)) by repetitive melting and fusion of the particles, and the B4C yield increased with irradiation time to 90% for 600 min of irradiation. At higher laser fluences, the B4C yield decreased due to the explosive ablation of boron or B4C to form H3BO3, and thus only the larger B4C particles were observed. The dielectric constant of the organic solvent also affected the generated B4C particle size, probably due to the degree of particle aggregation. Thus, this technique can provide a new approach for fabricating spherical submicron particles of ceramic materials, such as carbides, with simple and safe processes.